gentoo auto-resync : 26:04:2024 - 23:59:36

5 files changed, 3501 insertions, 28 deletions

diff --git a/sys-libs/glibc/Manifest b/sys-libs/glibc/Manifest
index 05247a8ad520..9e9454e0a58a 100644
--- a/sys-libs/glibc/Manifest
+++ b/sys-libs/glibc/Manifest
@@ -33,8 +33,10 @@ DIST glibc-2.37.tar.xz 18674604 BLAKE2B 8139cd977b2ed3bfdbde5ffb1cda8f759763dbb8
 DIST glibc-2.38-patches-10.tar.xz 60792 BLAKE2B e228568f9e9cfa719ee9f2f91d220efa53e4eba617377fdf37bf7381b9f7c43036dfe62dd284b4228e9a99d41223ed0416ed058407a630b84064962518cba90b SHA512 573661299d75b63b7e2f771e9032193492e762e64cbb495b42bb7ad1021532f54f19d829a721e8070c79b2ad5edef077584cc4c76896d951cc93275592cf255c
 DIST glibc-2.38-patches-11.tar.xz 67188 BLAKE2B 5025fd72359842a357e7c2cd76de3e717c9bd117259dd8be93aa6fcd906f8b65e266388bf685e611bfa439d57c03e0a4f7d024d7a766ff275277936f76f1ecbf SHA512 d0fa1c11c153c7ada8668d865a15c7c47013956b5fa1e0d0e2b7e24cea5d3e16909dc8f9ba9b2b392d85271ed71603deb440ead19de50fd61b53a6c1f73d467b
 DIST glibc-2.38-patches-12.tar.xz 83568 BLAKE2B 051f32976d82cfe510084a94a4a40f328531eab8601454685c906405a96bb92527780378ccf6bfa42ab9cbadc405545d3bd28d0c4a15927d1a1c18a7a23c513f SHA512 a66d567680f5b34e35d1e4c5c2a4a9b0af67450cc0ea4a03074ec66953d79e4d0e9e921ca44717b3ca45f5910a8cdb033818bc111efd93b41666610cc8478b67
+DIST glibc-2.38-patches-13.tar.xz 92708 BLAKE2B b2f05a793c92ea0b7901d2124fcd968fa846fdf687f8cbdbc17795c33fae2d538133fae66d575c5b98a7a05a29f9f816e7ecd45f3be5ed10ef65adbf92c7fc4d SHA512 24e45a88fa7676ef22a7e2bb864dff27262f69900c4ef76d21c6fee498d728949b6f5d03dd094d1774a66a8a47b779bf4b16ee31e5306bcdb55cedcc0a1c5e9f
 DIST glibc-2.38.tar.xz 18913712 BLAKE2B f9b039f0ef98a7dd8e1cba228ed10286b9e4fbe4dd89af4d26fa5c4e4cf266f19c2746b44d797ce54739d86499e74cf334aaf311bcf6e30120fd7748453e653f SHA512 a6dd5e42dcd63d58e2820c783522c8c895890b6e8c8e6c83b025553de0cc77cdf227e7044e431ead98c89c68a9ce4dd63509b47e647775fb2075f011849c1900
 DIST glibc-2.39-patches-3.tar.xz 69980 BLAKE2B 08239eb30c0059ea7ff750287f9349ebc4dff3416aa4711db2cdfedf5a01ba000e135b390528cc77e50c20cb2656aaa571c299542b495fe72828301f61702548 SHA512 47c87e568ce6bdddf42605d8c422869c238be13e77905051b214fed51265de0cd35c2031d0fc906019058f5a159b6b99ed52cb177450db2f710ce398770b3e85
+DIST glibc-2.39-patches-4.tar.xz 77228 BLAKE2B 64ead3c5f20092cde8ccd91692e556e412cfbe8ec22917db29a752ac9d8df2b1bcd20ce288253790ce391dcf82fcfec1f2a0895ae7d17842d45246d8d8881a6a SHA512 a84b76131a5c7c5c4d242dbefc124932a24177095a6447c715f9f8654cdd83190434d492c7ae3bf47b6e6eb717aae046b76647d653854add3d32e9e4b9fbefbe
 DIST glibc-2.39.tar.xz 18520988 BLAKE2B 9d98459a2d58401e07c081e0d841935b23998da75a7eb5a7ebd23a1f9ebab99dee623fe166397c1b6c926960c570f62dbca5cb3b5ce84a918adff6b7a15e16bb SHA512 818f58172a52815b4338ea9f2a69ecaa3335492b9f8f64cbf8afb24c0d737982341968ecd79631cae3d3074ab0ae4bc6056fc4ba3ffe790849dc374835cd57e2
 DIST glibc-systemd-20210729.tar.gz 1480 BLAKE2B 37722c7579df782d890e44dbab99c3de52ab466eb9de80d82405e9bb5620bf39ffc8c5f466a435bdb86ef6d36dd7019c0736573916bda6c67d02a2581e0ec979 SHA512 efd75af58b50522c28cdac7abd1fc56555bc1bb042512c90d8340c1ec09c5791b3872a305bf83723252bbde5855b75d958c041083457765c4cfd170732d09238
 DIST glibc-systemd-20210814.tar.gz 1469 BLAKE2B 10fa7bcb46d4fdce9c0ab353cbd30871e9b09a347a13a9c9a3b5777f931aa3c826c158d2e49532c604d4a834f2fab4089b67495fb88d0398945dc50d45ad9ef1 SHA512 5346a9ea459a1e6ccf665389f2a294de1e16f1e3e05cdf07e3dd99ed0e4f6f8b52cc333d4bff3c75ac90ab6ce70cd4ab2b3e126f920ce7979abd6dda56315efc
@@ -53,6 +55,8 @@ EBUILD glibc-2.37-r10.ebuild 52997 BLAKE2B 5302881267c59582fbdb775dd789597c19946
 EBUILD glibc-2.38-r10.ebuild 54293 BLAKE2B a1e9e5df6cf6454cd823f4c497113b4b958ee48f2e7caa1f0faa8f0a798d287b4c9b333b3e10a51f0f687fcea77f1cbf10aeb2d254f9d636e3224a645e39eb82 SHA512 49bd7ced8fe1781929d1b416dd121f247a2902bf258af361826fe58ef0192cb31055855fcf8cd36f8893e3013dc915febc8899bf4c61fc8010aa36480d245552
 EBUILD glibc-2.38-r11.ebuild 54516 BLAKE2B 5f54284b49ed56c0d22b425300d4926655d81755e6ba27417dc1fdc5e1137a50b9ae3de26c7475844b93b7b1ba815ab54e5d52c4c91b881a029a6320bdb0063b SHA512 e37b8a2498d8c0444843406e53b4b5f3fff873cee1521218eb5de364308c3dadb7d599314ba34efaf09d6b1309fa8e6fdb468e708597390252d4858d8047440c
 EBUILD glibc-2.38-r12.ebuild 54527 BLAKE2B 5ddbb7ff218028e3336d64bc72e31835910454c531d70668c5fd17a5b78d46f63de0f300ab3dc502bc65a0043a1070344ca8984611677cb73e3ca1b6d1f400c8 SHA512 610929ed92e750f348dc8e6417c00fff449ba2246a73f3f87ac84da3832dc38990376838c91cf1b7e04e759827f25e5838528c1f30b27d651c6914956e4d0b5b
-EBUILD glibc-2.39-r3.ebuild 54312 BLAKE2B 072e510616ea7803201aaf7254a57caaf74f9ed590dfa16c61a45d0f592b722fe3f967d95181ffea5c7c9659e8765137bb04b6c98c8e9b0e291c2b15420e74d0 SHA512 85af2ba4330308ab2e940f42681e3f15b7f2581fb18811ef970b6acf4d862ca1ee6087a08bc7041f10c9f32cf240f3a366805d44a8670efc4401534a71fe2f9a
-EBUILD glibc-9999.ebuild 54313 BLAKE2B 92c498ab3299b45949e908051753456d855e9fe50cd0297240115e6c2220138725cb44660e361b2cdfd7edfc2319d65e9c5287b0470795c89173ca49a6fea284 SHA512 83e28cf60b14a97c0d71b0534efbc73869fcf1d14bf8c320c3a657be7ba2ca73be3aef9c627e24628396ab2bc252313596b29a503e9dc7c3ebd8318c0fa63fd2
+EBUILD glibc-2.38-r13.ebuild 54529 BLAKE2B 009ae6cee829bb9bf05e15377b2d496b31604647ccd6d6a3e3f971d13f95846adfdf159b6822e81ecdf9453ef61bd4be73e3c5995a2e4ebac1b1a6218e0e4847 SHA512 a64a423e3b1036fb724fe0c54e320809538d8b512f65eac17254ae40270ea694528be9db51aa62fb598fb7f6624a96d0da6353007e8dd36717c2b99cd8b89d82
+EBUILD glibc-2.39-r3.ebuild 54349 BLAKE2B 10c2f2e6629e44bade5461241a550304dfee3605db5d2bbda253eee20cfb21bfc4c893b2acffe13692ad4ca7f2aa4a320b52ff94a657ebae8c1db0b9b5e90a7b SHA512 9293f95738aa21156278e990b681ca1b43e0bab97f52e1a62ce12fe05e3beda87b372a1438b0c22f93d7749926c23f7138f5e3b09645b751ce6d8cb6c497a200
+EBUILD glibc-2.39-r4.ebuild 54349 BLAKE2B 64ba84c0fc6ac011c602edb0d2bf429b6e2aa8066ecd5d5f1539677ed56430c90464738d7a0445b5a1be9395fd973b4e18b69c219d967ec74d2bfc7d0d778e0c SHA512 4119a72fb4fca2477ea5661f1a19872f4434b74cae31eb44353cb6155d7d3c169871e75aa37fdc69bf300b1ffcbdaacbe59bad4d947b231145f49527e6adfbad
+EBUILD glibc-9999.ebuild 54350 BLAKE2B 3672dea9b9b5cc17158a2d3f3ec38d464b44c651676f8bd542a2f7ffa22c0401dda6555bca8530ef2c865ca640fdf91f62d609510caaf12099ce0569e3eca3cf SHA512 226e41bf9b06401613c4c77e7751f860628cc83536036438a85c0324bfb0e96e490d51c02baadf38124594e78043b531765a2f9d6e2faa81f3de55a26a8499ff
 MISC metadata.xml 2142 BLAKE2B 765ba540eb10afccd1bade4de56f0c13ce269225500a62d1d17328194de69e7fa15d359a14eac6bfa8a36df45344db3d52f5e1811b174cf1fa2bfb95ad7760a7 SHA512 2f4a148c076a0967663d14e76b85a698ddae7093ff299b0dc95a6c3b00957c9bf73443f2bace9670eb62a45465efbcca892bb52b6aac8577acb2bc5f74a7397c
diff --git a/sys-libs/glibc/glibc-2.38-r13.ebuild b/sys-libs/glibc/glibc-2.38-r13.ebuild
new file mode 100644
index 000000000000..11905f8503e2
--- /dev/null
+++ b/sys-libs/glibc/glibc-2.38-r13.ebuild
@@ -0,0 +1,1724 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# Bumping notes: https://wiki.gentoo.org/wiki/Project:Toolchain/sys-libs/glibc
+# Please read & adapt the page as necessary if obsolete.
+
+PYTHON_COMPAT=( python3_{10..12} )
+TMPFILES_OPTIONAL=1
+
+inherit python-any-r1 prefix preserve-libs toolchain-funcs flag-o-matic gnuconfig \
+	multilib systemd multiprocessing tmpfiles
+
+DESCRIPTION="GNU libc C library"
+HOMEPAGE="https://www.gnu.org/software/libc/"
+LICENSE="LGPL-2.1+ BSD HPND ISC inner-net rc PCRE"
+SLOT="2.2"
+
+EMULTILIB_PKG="true"
+
+# Gentoo patchset (ignored for live ebuilds)
+PATCH_VER=13
+PATCH_DEV=dilfridge
+
+# gcc mulitilib bootstrap files version
+GCC_BOOTSTRAP_VER=20201208
+
+# systemd integration version
+GLIBC_SYSTEMD_VER=20210729
+
+# Minimum kernel version that glibc requires
+MIN_KERN_VER="3.2.0"
+
+# Minimum pax-utils version needed (which contains any new syscall changes for
+# its seccomp filter!). Please double check this!
+MIN_PAX_UTILS_VER="1.3.3"
+
+if [[ ${PV} == 9999* ]]; then
+	inherit git-r3
+else
+	KEYWORDS="~alpha amd64 ~arm arm64 ~hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc ~x86"
+	SRC_URI="mirror://gnu/glibc/${P}.tar.xz"
+	SRC_URI+=" https://dev.gentoo.org/~${PATCH_DEV}/distfiles/${P}-patches-${PATCH_VER}.tar.xz"
+fi
+
+SRC_URI+=" multilib-bootstrap? ( https://dev.gentoo.org/~dilfridge/distfiles/gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz )"
+SRC_URI+=" systemd? ( https://gitweb.gentoo.org/proj/toolchain/glibc-systemd.git/snapshot/glibc-systemd-${GLIBC_SYSTEMD_VER}.tar.gz )"
+
+IUSE="audit caps cet compile-locales +crypt custom-cflags doc gd hash-sysv-compat headers-only +multiarch multilib multilib-bootstrap nscd perl profile selinux +ssp stack-realign +static-libs suid systemd systemtap test vanilla"
+
+# Here's how the cross-compile logic breaks down ...
+#  CTARGET - machine that will target the binaries
+#  CHOST   - machine that will host the binaries
+#  CBUILD  - machine that will build the binaries
+# If CTARGET != CHOST, it means you want a libc for cross-compiling.
+# If CHOST != CBUILD, it means you want to cross-compile the libc.
+#  CBUILD = CHOST = CTARGET    - native build/install
+#  CBUILD != (CHOST = CTARGET) - cross-compile a native build
+#  (CBUILD = CHOST) != CTARGET - libc for cross-compiler
+#  CBUILD != CHOST != CTARGET  - cross-compile a libc for a cross-compiler
+# For install paths:
+#  CHOST = CTARGET  - install into /
+#  CHOST != CTARGET - install into /usr/CTARGET/
+#
+export CBUILD=${CBUILD:-${CHOST}}
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} == ${CHOST} ]] ; then
+	if [[ ${CATEGORY} == cross-* ]] ; then
+		export CTARGET=${CATEGORY#cross-}
+	fi
+fi
+
+# Note [Disable automatic stripping]
+# Disabling automatic stripping for a few reasons:
+# - portage's attempt to strip breaks non-native binaries at least on
+#   arm: bug #697428
+# - portage's attempt to strip libpthread.so.0 breaks gdb thread
+#   enumeration: bug #697910. This is quite subtle:
+#   * gdb uses glibc's libthread_db-1.0.so to enumerate threads.
+#   * libthread_db-1.0.so needs access to libpthread.so.0 local symbols
+#     via 'ps_pglobal_lookup' symbol defined in gdb.
+#   * 'ps_pglobal_lookup' uses '.symtab' section table to resolve all
+#     known symbols in 'libpthread.so.0'. Specifically 'nptl_version'
+#     (unexported) is used to sanity check compatibility before enabling
+#     debugging.
+#     Also see https://sourceware.org/gdb/wiki/FAQ#GDB_does_not_see_any_threads_besides_the_one_in_which_crash_occurred.3B_or_SIGTRAP_kills_my_program_when_I_set_a_breakpoint
+#   * normal 'strip' command trims '.symtab'
+#   Thus our main goal here is to prevent 'libpthread.so.0' from
+#   losing it's '.symtab' entries.
+# - similarly, valgrind requires knowledge about symbols in ld.so:
+#	bug #920753
+# As Gentoo's strip does not allow us to pass less aggressive stripping
+# options and does not check the machine target we strip selectively.
+
+# We need a new-enough binutils/gcc to match upstream baseline.
+# Also we need to make sure our binutils/gcc supports TLS,
+# and that gcc already contains the hardened patches.
+# Lastly, let's avoid some openssh nastiness, bug 708224, as
+# convenience to our users.
+
+IDEPEND="
+	!compile-locales? ( sys-apps/locale-gen )
+"
+BDEPEND="
+	${PYTHON_DEPS}
+	>=app-misc/pax-utils-${MIN_PAX_UTILS_VER}
+	sys-devel/bison
+	compile-locales? ( sys-apps/locale-gen )
+	doc? (
+		dev-lang/perl
+		sys-apps/texinfo
+	)
+	test? (
+		dev-lang/perl
+		>=net-dns/libidn2-2.3.0
+	)
+"
+COMMON_DEPEND="
+	gd? ( media-libs/gd:2= )
+	nscd? ( selinux? (
+		audit? ( sys-process/audit )
+		caps? ( sys-libs/libcap )
+	) )
+	suid? ( caps? ( sys-libs/libcap ) )
+	selinux? ( sys-libs/libselinux )
+	systemtap? ( dev-debug/systemtap )
+"
+DEPEND="${COMMON_DEPEND}
+"
+RDEPEND="${COMMON_DEPEND}
+	!<app-misc/pax-utils-${MIN_PAX_UTILS_VER}
+	perl? ( dev-lang/perl )
+"
+
+RESTRICT="!test? ( test )"
+
+if [[ ${CATEGORY} == cross-* ]] ; then
+	BDEPEND+=" !headers-only? (
+		>=${CATEGORY}/binutils-2.27
+		>=${CATEGORY}/gcc-6.2
+	)"
+	[[ ${CATEGORY} == *-linux* ]] && DEPEND+=" ${CATEGORY}/linux-headers"
+else
+	BDEPEND+="
+		>=sys-devel/binutils-2.27
+		>=sys-devel/gcc-6.2
+	"
+	DEPEND+=" virtual/os-headers "
+	RDEPEND+="
+		>=net-dns/libidn2-2.3.0
+		vanilla? ( !sys-libs/timezone-data )
+	"
+	PDEPEND+=" !vanilla? ( sys-libs/timezone-data )"
+fi
+
+# Ignore tests whitelisted below
+GENTOO_GLIBC_XFAIL_TESTS="${GENTOO_GLIBC_XFAIL_TESTS:-yes}"
+
+# The following tests fail due to the Gentoo build system and are thus
+# executed but ignored:
+XFAIL_TEST_LIST=(
+	# buggy test, assumes /dev/ and /dev/null on a single filesystem
+	# 'mount --bind /dev/null /chroot/dev/null' breaks it.
+	# https://sourceware.org/PR25909
+	tst-support_descriptors
+
+	# The following tests fail only inside portage
+	# https://bugs.gentoo.org/831267
+	tst-system
+	tst-strerror
+	tst-strsignal
+	# Fails with certain PORTAGE_NICENESS/PORTAGE_SCHEDULING_POLICY
+	tst-sched1
+)
+
+XFAIL_NSPAWN_TEST_LIST=(
+	# These tests need to be adapted to handle EPERM/ENOSYS(?) properly
+	# upstream, as systemd-nspawn's default seccomp whitelist is too strict.
+	# https://sourceware.org/PR30603
+	test-errno-linux
+	tst-bz21269
+	tst-mlock2
+	tst-ntp_gettime
+	tst-ntp_gettime-time64
+	tst-ntp_gettimex
+	tst-ntp_gettimex-time64
+	tst-pkey
+	tst-process_mrelease
+	tst-adjtime
+	tst-adjtime-time64
+	tst-clock2
+	tst-clock2-time64
+
+	# These fail if --suppress-sync and/or low priority is set
+	tst-sync_file_range
+	test-errno
+)
+
+#
+# Small helper functions
+#
+
+dump_build_environment() {
+	einfo ==== glibc build environment ========================================================
+	local v
+	for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC CXX CPP LD {AS,C,CPP,CXX,LD}FLAGS MAKEINFO NM AR AS STRIP RANLIB OBJCOPY STRINGS OBJDUMP READELF; do
+		einfo " $(printf '%15s' ${v}:)   ${!v}"
+	done
+	einfo =====================================================================================
+}
+
+is_crosscompile() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+
+just_headers() {
+	is_crosscompile && use headers-only
+}
+
+alt_prefix() {
+	is_crosscompile && echo /usr/${CTARGET}
+}
+
+# This prefix is applicable to CHOST when building against this
+# glibc. It is baked into the library at configure time.
+host_eprefix() {
+	is_crosscompile || echo "${EPREFIX}"
+}
+
+# This prefix is applicable to CBUILD when building against this
+# glibc. It determines the destination path at install time.
+build_eprefix() {
+	is_crosscompile && echo "${EPREFIX}"
+}
+
+# We need to be able to set alternative headers for compiling for non-native
+# platform. Will also become useful for testing kernel-headers without screwing
+# up the whole system.
+alt_headers() {
+	echo ${ALT_HEADERS:=$(alt_prefix)/usr/include}
+}
+
+alt_build_headers() {
+	if [[ -z ${ALT_BUILD_HEADERS} ]] ; then
+		ALT_BUILD_HEADERS="$(host_eprefix)$(alt_headers)"
+		if tc-is-cross-compiler ; then
+			ALT_BUILD_HEADERS=${SYSROOT}$(alt_headers)
+			if [[ ! -e ${ALT_BUILD_HEADERS}/linux/version.h ]] ; then
+				local header_path=$(echo '#include <linux/version.h>' | $(tc-getCPP ${CTARGET}) ${CFLAGS} 2>&1 | grep -o '[^"]*linux/version.h')
+				ALT_BUILD_HEADERS=${header_path%/linux/version.h}
+			fi
+		fi
+	fi
+	echo "${ALT_BUILD_HEADERS}"
+}
+
+alt_libdir() {
+	echo $(alt_prefix)/$(get_libdir)
+}
+alt_usrlibdir() {
+	echo $(alt_prefix)/usr/$(get_libdir)
+}
+
+builddir() {
+	echo "${WORKDIR}/build-${ABI}-${CTARGET}-$1"
+}
+
+do_compile_test() {
+	local ret save_cflags=${CFLAGS}
+	CFLAGS+=" $1"
+	shift
+
+	pushd "${T}" >/dev/null
+
+	rm -f glibc-test*
+	printf '%b' "$*" > glibc-test.c
+
+	# We assume CC is already set up.
+	nonfatal emake glibc-test
+	ret=$?
+
+	popd >/dev/null
+
+	CFLAGS=${save_cflags}
+	return ${ret}
+}
+
+do_run_test() {
+	local ret
+
+	if [[ ${MERGE_TYPE} == "binary" ]] ; then
+		# ignore build failures when installing a binary package #324685
+		do_compile_test "" "$@" 2>/dev/null || return 0
+	else
+		if ! do_compile_test "" "$@" ; then
+			ewarn "Simple build failed ... assuming this is desired #324685"
+			return 0
+		fi
+	fi
+
+	pushd "${T}" >/dev/null
+
+	./glibc-test
+	ret=$?
+	rm -f glibc-test*
+
+	popd >/dev/null
+
+	return ${ret}
+}
+
+setup_target_flags() {
+	# This largely mucks with compiler flags.  None of which should matter
+	# when building up just the headers.
+	just_headers && return 0
+
+	case $(tc-arch) in
+		x86)
+			# -march needed for #185404 #199334
+			# TODO: When creating the first glibc cross-compile, this test will
+			# always fail as it does a full link which in turn requires glibc.
+			# Probably also applies when changing multilib profile settings (e.g.
+			# enabling x86 when the profile was amd64-only previously).
+			# We could change main to _start and pass -nostdlib here so that we
+			# only test the gcc code compilation.  Or we could do a compile and
+			# then look for the symbol via scanelf.
+			if ! do_compile_test "" 'void f(int i, void *p) {if (__sync_fetch_and_add(&i, 1)) f(i, p);}\nint main(){return 0;}\n'; then
+				local t=${CTARGET_OPT:-${CTARGET}}
+				t=${t%%-*}
+				filter-flags '-march=*'
+				export CFLAGS="-march=${t} ${CFLAGS}"
+				einfo "Auto adding -march=${t} to CFLAGS #185404"
+			fi
+			# For compatibility with older binaries at slight performance cost.
+			use stack-realign && export CFLAGS+=" -mstackrealign"
+		;;
+		amd64)
+			# -march needed for #185404 #199334
+			# TODO: See cross-compile issues listed above for x86.
+			if [[ ${ABI} == x86 ]]; then
+				if ! do_compile_test "${CFLAGS_x86}" 'void f(int i, void *p) {if (__sync_fetch_and_add(&i, 1)) f(i, p);}\nint main(){return 0;}\n'; then
+					local t=${CTARGET_OPT:-${CTARGET}}
+					t=${t%%-*}
+					# Normally the target is x86_64-xxx, so turn that into the -march that
+					# gcc actually accepts. #528708
+					[[ ${t} == "x86_64" ]] && t="x86-64"
+					filter-flags '-march=*'
+					# ugly, ugly, ugly.  ugly.
+					CFLAGS_x86=$(CFLAGS=${CFLAGS_x86} filter-flags '-march=*'; echo "${CFLAGS}")
+					export CFLAGS_x86="${CFLAGS_x86} -march=${t}"
+					einfo "Auto adding -march=${t} to CFLAGS_x86 #185404 (ABI=${ABI})"
+				fi
+				# For compatibility with older binaries at slight performance cost.
+				use stack-realign && export CFLAGS_x86+=" -mstackrealign"
+
+				# Workaround for bug #823780.
+				# Need to save/restore CC because earlier on, we stuff it full of CFLAGS, and tc-getCPP doesn't like that.
+				CC_mangled=${CC}
+				CC=${glibc__GLIBC_CC}
+				if tc-is-gcc && (($(gcc-major-version) == 11)) && (($(gcc-minor-version) <= 2)) && (($(gcc-micro-version) == 0)) ; then
+					export CFLAGS_x86="${CFLAGS_x86} -mno-avx512f"
+					einfo "Auto adding -mno-avx512f to CFLAGS_x86 for buggy GCC version (bug #823780) (ABI=${ABI})"
+				fi
+				CC=${CC_mangled}
+			fi
+		;;
+		mips)
+			# The mips abi cannot support the GNU style hashes. #233233
+			filter-ldflags -Wl,--hash-style=gnu -Wl,--hash-style=both
+		;;
+		ppc|ppc64)
+			# Many arch-specific implementations do not work on ppc with
+			# cache-block not equal to 128 bytes. This breaks memset:
+			#   https://sourceware.org/PR26522
+			#   https://bugs.gentoo.org/737996
+			# Use default -mcpu=. For ppc it means non-multiarch setup.
+			filter-flags '-mcpu=*'
+		;;
+		sparc)
+			# Both sparc and sparc64 can use -fcall-used-g6.  -g7 is bad, though.
+			filter-flags "-fcall-used-g7"
+			append-flags "-fcall-used-g6"
+
+			local cpu
+			case ${CTARGET} in
+			sparc64-*)
+				cpu="sparc64"
+				case $(get-flag mcpu) in
+				v9)
+					# We need to force at least v9a because the base build doesn't
+					# work with just v9.
+					# https://sourceware.org/bugzilla/show_bug.cgi?id=19477
+					append-flags "-Wa,-xarch=v9a"
+					;;
+				esac
+				;;
+			sparc-*)
+				case $(get-flag mcpu) in
+				v8|supersparc|hypersparc|leon|leon3)
+					cpu="sparcv8"
+					;;
+				*)
+					cpu="sparcv9"
+					;;
+				esac
+			;;
+			esac
+			[[ -n ${cpu} ]] && CTARGET_OPT="${cpu}-${CTARGET#*-}"
+		;;
+	esac
+}
+
+setup_flags() {
+	# Make sure host make.conf doesn't pollute us
+	if is_crosscompile || tc-is-cross-compiler ; then
+		CHOST=${CTARGET} strip-unsupported-flags
+	fi
+
+	# Store our CFLAGS because it's changed depending on which CTARGET
+	# we are building when pulling glibc on a multilib profile
+	CFLAGS_BASE=${CFLAGS_BASE-${CFLAGS}}
+	CFLAGS=${CFLAGS_BASE}
+	CXXFLAGS_BASE=${CXXFLAGS_BASE-${CXXFLAGS}}
+	CXXFLAGS=${CXXFLAGS_BASE}
+	ASFLAGS_BASE=${ASFLAGS_BASE-${ASFLAGS}}
+	ASFLAGS=${ASFLAGS_BASE}
+
+	# Allow users to explicitly avoid flag sanitization via
+	# USE=custom-cflags.
+	if ! use custom-cflags; then
+		# Over-zealous CFLAGS can often cause problems.  What may work for one
+		# person may not work for another.  To avoid a large influx of bugs
+		# relating to failed builds, we strip most CFLAGS out to ensure as few
+		# problems as possible.
+		strip-flags
+		# Lock glibc at -O2; we want to be conservative here.
+		filter-flags '-O?'
+		append-flags -O2
+	fi
+
+	strip-unsupported-flags
+	filter-lto
+	filter-flags -m32 -m64 '-mabi=*'
+
+	# glibc aborts if rpath is set by LDFLAGS
+	filter-ldflags '-Wl,-rpath=*'
+
+	# ld can't use -r & --relax at the same time, bug #788901
+	# https://sourceware.org/PR27837
+	filter-ldflags '-Wl,--relax'
+
+	# Flag added for cross-prefix, but causes ldconfig to segfault. Not needed
+	# anyway because glibc already handles this by itself.
+	filter-ldflags '-Wl,--dynamic-linker=*'
+
+	# some weird software relies on sysv hashes in glibc, bug 863863, bug 864100
+	# we have to do that here already so mips can filter it out again :P
+	if use hash-sysv-compat ; then
+		append-ldflags '-Wl,--hash-style=both'
+	fi
+
+	# #492892
+	filter-flags -frecord-gcc-switches
+
+	# #898098
+	filter-flags -fno-builtin
+
+	# #829583
+	filter-lfs-flags
+
+	unset CBUILD_OPT CTARGET_OPT
+	if use multilib ; then
+		CTARGET_OPT=$(get_abi_CTARGET)
+		[[ -z ${CTARGET_OPT} ]] && CTARGET_OPT=$(get_abi_CHOST)
+	fi
+
+	setup_target_flags
+
+	if [[ -n ${CTARGET_OPT} && ${CBUILD} == ${CHOST} ]] && ! is_crosscompile; then
+		CBUILD_OPT=${CTARGET_OPT}
+	fi
+
+	# glibc's headers disallow -O0 and fail at build time:
+	#  include/libc-symbols.h:75:3: #error "glibc cannot be compiled without optimization"
+	# https://sourceware.org/glibc/wiki/FAQ#Why_do_I_get:.60.23error_.22glibc_cannot_be_compiled_without_optimization.22.27.2C_when_trying_to_compile_GNU_libc_with_GNU_CC.3F
+	replace-flags -O0 -O1
+
+	# glibc handles this internally already where it's appropriate;
+	# can't always have SSP when we're the ones setting it up, etc
+	filter-flags '-fstack-protector*'
+
+	# Similar issues as with SSP. Can't inject yourself that early.
+	filter-flags '-fsanitize=*'
+
+	# See end of bug #830454; we handle this via USE=cet
+	filter-flags '-fcf-protection=*'
+
+	# When bootstrapping, we may have a situation where
+	# CET-enabled gcc from seed is used to build CET-disabled
+	# glibc. As such, gcc implicitly enables CET if no
+	# -fcf-protection flag is passed. For a typical package it
+	# should not be a problem, but for glibc it matters as it is
+	# dealing with CET in ld.so. So if CET is supposed to be
+	# disabled for glibc, be explicit about it.
+	if (use amd64 || use x86) && ! use cet; then
+		append-flags '-fcf-protection=none'
+	fi
+}
+
+use_multiarch() {
+	# Allow user to disable runtime arch detection in multilib.
+	use multiarch || return 1
+	# Make sure binutils is new enough to support indirect functions,
+	# #336792. This funky sed supports gold and bfd linkers.
+	local bver nver
+	bver=$($(tc-getLD ${CTARGET}) -v | sed -n -r '1{s:[^0-9]*::;s:^([0-9.]*).*:\1:;p}')
+	case $(tc-arch ${CTARGET}) in
+	amd64|x86) nver="2.20" ;;
+	arm)       nver="2.22" ;;
+	hppa)      nver="2.23" ;;
+	ppc|ppc64) nver="2.20" ;;
+	# ifunc support was added in 2.23, but glibc also needs
+	# machinemode which is in 2.24.
+	s390)      nver="2.24" ;;
+	sparc)     nver="2.21" ;;
+	*)         return 1 ;;
+	esac
+	ver_test ${bver} -ge ${nver}
+}
+
+# Setup toolchain variables that had historically been defined in the
+# profiles for these archs.
+setup_env() {
+	# silly users
+	unset LD_RUN_PATH
+	unset LD_ASSUME_KERNEL
+
+	if is_crosscompile || tc-is-cross-compiler ; then
+		multilib_env ${CTARGET_OPT:-${CTARGET}}
+
+		if ! use multilib ; then
+			MULTILIB_ABIS=${DEFAULT_ABI}
+		else
+			MULTILIB_ABIS=${MULTILIB_ABIS:-${DEFAULT_ABI}}
+		fi
+
+		# If the user has CFLAGS_<CTARGET> in their make.conf, use that,
+		# and fall back on CFLAGS.
+		local VAR=CFLAGS_${CTARGET//[-.]/_}
+		CFLAGS=${!VAR-${CFLAGS}}
+		einfo " $(printf '%15s' 'Manual CFLAGS:')   ${CFLAGS}"
+	fi
+
+	setup_flags
+
+	export ABI=${ABI:-${DEFAULT_ABI:-default}}
+
+	if just_headers ; then
+		# Avoid mixing host's CC and target's CFLAGS_${ABI}:
+		# At this bootstrap stage we have only binutils for
+		# target but not compiler yet.
+		einfo "Skip CC ABI injection. We can't use (cross-)compiler yet."
+		return 0
+	fi
+
+	# Glibc does not work with gold (for various reasons) #269274.
+	tc-ld-disable-gold
+
+	if use doc ; then
+		export MAKEINFO=makeinfo
+	else
+		export MAKEINFO=/dev/null
+	fi
+
+	# Reset CC and CXX to the value at start of emerge
+	export CC=${glibc__ORIG_CC:-${CC:-$(tc-getCC ${CTARGET})}}
+	export CXX=${glibc__ORIG_CXX:-${CXX:-$(tc-getCXX ${CTARGET})}}
+	export CPP=${glibc__ORIG_CPP:-${CPP:-$(tc-getCPP ${CTARGET})}}
+
+	# and make sure glibc__ORIG_CC and glibc__ORIG_CXX is defined now.
+	export glibc__ORIG_CC=${CC}
+	export glibc__ORIG_CXX=${CXX}
+	export glibc__ORIG_CPP=${CPP}
+
+	if tc-is-clang && ! use custom-cflags && ! is_crosscompile ; then
+		export glibc__force_gcc=yes
+		# once this is toggled on, it needs to stay on, since with CPP manipulated
+		# tc-is-clang does not work correctly anymore...
+	fi
+
+	if [[ ${glibc__force_gcc} == "yes" ]] ; then
+		# If we are running in an otherwise clang/llvm environment, we need to
+		# recover the proper gcc and binutils settings here, at least until glibc
+		# is finally building with clang. So let's override everything that is
+		# set in the clang profiles.
+		# Want to shoot yourself into the foot? Set USE=custom-cflags, that's always
+		# a good start into that direction.
+		# Also, if you're crosscompiling, let's assume you know what you are doing.
+		# Hopefully.
+		# Last, we need the settings of the *build* environment, not of the
+		# target environment...
+
+		local current_binutils_path=$(env ROOT="${BROOT}" binutils-config -B)
+		local current_gcc_path=$(env ROOT="${BROOT}" gcc-config -B)
+		einfo "Overriding clang configuration, since it won't work here"
+
+		export CC="${current_gcc_path}/gcc"
+		export CPP="${current_gcc_path}/cpp"
+		export CXX="${current_gcc_path}/g++"
+		export CPP="$(tc-getCPP ${CTARGET})"
+		export LD="${current_binutils_path}/ld.bfd"
+		export AR="${current_binutils_path}/ar"
+		export AS="${current_binutils_path}/as"
+		export NM="${current_binutils_path}/nm"
+		export STRIP="${current_binutils_path}/strip"
+		export RANLIB="${current_binutils_path}/ranlib"
+		export OBJCOPY="${current_binutils_path}/objcopy"
+		export STRINGS="${current_binutils_path}/strings"
+		export OBJDUMP="${current_binutils_path}/objdump"
+		export READELF="${current_binutils_path}/readelf"
+		export ADDR2LINE="${current_binutils_path}/addr2line"
+
+		# do we need to also do flags munging here? yes! at least...
+		filter-flags '-fuse-ld=*'
+		filter-flags '-D_FORTIFY_SOURCE=*'
+
+	else
+
+		# this is the "normal" case
+
+		export CC="$(tc-getCC ${CTARGET})"
+		export CXX="$(tc-getCXX ${CTARGET})"
+
+		# Always use tuple-prefixed toolchain. For non-native ABI glibc's configure
+		# can't detect them automatically due to ${CHOST} mismatch and fallbacks
+		# to unprefixed tools. Similar to multilib.eclass:multilib_toolchain_setup().
+		export NM="$(tc-getNM ${CTARGET})"
+		export READELF="$(tc-getREADELF ${CTARGET})"
+
+	fi
+
+	# We need to export CFLAGS with abi information in them because glibc's
+	# configure script checks CFLAGS for some targets (like mips).  Keep
+	# around the original clean value to avoid appending multiple ABIs on
+	# top of each other. (Why does the comment talk about CFLAGS if the code
+	# acts on CC?)
+	export glibc__GLIBC_CC=${CC}
+	export glibc__GLIBC_CXX=${CXX}
+	export glibc__GLIBC_CPP=${CPP}
+
+	export glibc__abi_CFLAGS="$(get_abi_CFLAGS)"
+
+	# CFLAGS can contain ABI-specific flags like -mfpu=neon, see bug #657760
+	# To build .S (assembly) files with the same ABI-specific flags
+	# upstream currently recommends adding CFLAGS to CC/CXX:
+	#    https://sourceware.org/PR23273
+	# Note: Passing CFLAGS via CPPFLAGS overrides glibc's arch-specific CFLAGS
+	# and breaks multiarch support. See 659030#c3 for an example.
+	# The glibc configure script doesn't properly use LDFLAGS all the time.
+	export CC="${glibc__GLIBC_CC} ${glibc__abi_CFLAGS} ${CFLAGS} ${LDFLAGS}"
+
+	# Some of the tests are written in C++, so we need to force our multlib abis in, bug 623548
+	export CXX="${glibc__GLIBC_CXX} ${glibc__abi_CFLAGS} ${CFLAGS}"
+
+	export CPP="${glibc__GLIBC_CPP} ${glibc__abi_CFLAGS} ${CFLAGS}"
+
+	if is_crosscompile; then
+		# Assume worst-case bootstrap: glibc is built for the first time
+		# with ${CTARGET}-g++ not available yet. We avoid
+		# building auxiliary programs that require C++: bug #683074
+		# It should not affect final result.
+		export libc_cv_cxx_link_ok=no
+		# The line above has the same effect. We set CXX explicitly
+		# to make build logs less confusing.
+		export CXX=
+	fi
+}
+
+foreach_abi() {
+	setup_env
+
+	local ret=0
+	local abilist=""
+	if use multilib ; then
+		abilist=$(get_install_abis)
+	else
+		abilist=${DEFAULT_ABI}
+	fi
+	local -x ABI
+	for ABI in ${abilist:-default} ; do
+		setup_env
+		einfo "Running $1 for ABI ${ABI}"
+		$1
+		: $(( ret |= $? ))
+	done
+	return ${ret}
+}
+
+glibc_banner() {
+	local b="Gentoo ${PVR}"
+	[[ -n ${PATCH_VER} ]] && ! use vanilla && b+=" (patchset ${PATCH_VER})"
+	echo "${b}"
+}
+
+# The following Kernel version handling functions are mostly copied from portage
+# source. It's better not to use linux-info.eclass here since a) it adds too
+# much magic, see bug 326693 for some of the arguments, and b) some of the
+# functions are just not provided.
+
+g_get_running_KV() {
+	uname -r
+	return $?
+}
+
+g_KV_major() {
+	[[ -z $1 ]] && return 1
+	local KV=$@
+	echo "${KV%%.*}"
+}
+
+g_KV_minor() {
+	[[ -z $1 ]] && return 1
+	local KV=$@
+	KV=${KV#*.}
+	echo "${KV%%.*}"
+}
+
+g_KV_micro() {
+	[[ -z $1 ]] && return 1
+	local KV=$@
+	KV=${KV#*.*.}
+	echo "${KV%%[^[:digit:]]*}"
+}
+
+g_KV_to_int() {
+	[[ -z $1 ]] && return 1
+	local KV_MAJOR=$(g_KV_major "$1")
+	local KV_MINOR=$(g_KV_minor "$1")
+	local KV_MICRO=$(g_KV_micro "$1")
+	local KV_int=$(( KV_MAJOR * 65536 + KV_MINOR * 256 + KV_MICRO ))
+
+	# We make version 2.2.0 the minimum version we will handle as
+	# a sanity check ... if its less, we fail ...
+	if [[ ${KV_int} -ge 131584 ]] ; then
+		echo "${KV_int}"
+		return 0
+	fi
+	return 1
+}
+
+g_int_to_KV() {
+	local version=$1 major minor micro
+	major=$((version / 65536))
+	minor=$(((version % 65536) / 256))
+	micro=$((version % 256))
+	echo ${major}.${minor}.${micro}
+}
+
+eend_KV() {
+	[[ $(g_KV_to_int $1) -ge $(g_KV_to_int $2) ]]
+	eend $?
+}
+
+get_kheader_version() {
+	printf '#include <linux/version.h>\nLINUX_VERSION_CODE\n' | \
+	$(tc-getCPP ${CTARGET}) -I "$(build_eprefix)$(alt_build_headers)" - | \
+	tail -n 1
+}
+
+# We collect all sanity checks here. Consistency is not guranteed between
+# pkg_ and src_ phases, so we call this function both in pkg_pretend and in
+# src_unpack.
+sanity_prechecks() {
+	# Prevent native builds from downgrading
+	if [[ ${MERGE_TYPE} != "buildonly" ]] && \
+	   [[ -z ${ROOT} ]] && \
+	   [[ ${CBUILD} == ${CHOST} ]] && \
+	   [[ ${CHOST} == ${CTARGET} ]] ; then
+
+		# The high rev # is to allow people to downgrade between -r#
+		# versions. We want to block 2.20->2.19, but 2.20-r3->2.20-r2
+		# should be fine. Hopefully we never actually use a r# this
+		# high.
+		if has_version ">${CATEGORY}/${P}-r10000" ; then
+			eerror "Sanity check to keep you from breaking your system:"
+			eerror " Downgrading glibc is not supported and a sure way to destruction."
+			[[ ${I_ALLOW_TO_BREAK_MY_SYSTEM} = yes ]] || die "Aborting to save your system."
+		fi
+
+		if ! do_run_test '#include <unistd.h>\n#include <sys/syscall.h>\nint main(){return syscall(1000)!=-1;}\n' ; then
+			eerror "Your old kernel is broken. You need to update it to a newer"
+			eerror "version as syscall(<bignum>) will break. See bug 279260."
+			die "Old and broken kernel."
+		fi
+	fi
+
+	if [[ ${CTARGET} == i386-* ]] ; then
+		eerror "i386 CHOSTs are no longer supported."
+		eerror "Chances are you don't actually want/need i386."
+		eerror "Please read https://www.gentoo.org/doc/en/change-chost.xml"
+		die "Please fix your CHOST"
+	fi
+
+	if [[ -e /proc/xen ]] && [[ $(tc-arch) == "x86" ]] && ! is-flag -mno-tls-direct-seg-refs ; then
+		ewarn "You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS."
+		ewarn "This will result in a 50% performance penalty when running with a 32bit"
+		ewarn "hypervisor, which is probably not what you want."
+	fi
+
+	# ABI-specific checks follow here. Hey, we have a lot more specific conditions that
+	# we test for...
+	if ! is_crosscompile ; then
+		if use amd64 && use multilib && [[ ${MERGE_TYPE} != "binary" ]] ; then
+			ebegin "Checking that IA32 emulation is enabled in the running kernel"
+			echo 'int main(){return 0;}' > "${T}/check-ia32-emulation.c"
+			local STAT
+			if ${CC-${CHOST}-gcc} ${CFLAGS_x86} "${T}/check-ia32-emulation.c" -o "${T}/check-ia32-emulation.elf32"; then
+				"${T}/check-ia32-emulation.elf32"
+				STAT=$?
+			else
+				# Don't fail here to allow single->multi ABI switch
+				# or recover from breakage like bug #646424
+				ewarn "Failed to compile the ABI test. Broken host glibc?"
+				STAT=0
+			fi
+			rm -f "${T}/check-ia32-emulation.elf32"
+			eend $STAT
+			[[ $STAT -eq 0 ]] || die "CONFIG_IA32_EMULATION must be enabled in the kernel to compile a multilib glibc."
+		fi
+
+	fi
+
+	# When we actually have to compile something...
+	if ! just_headers && [[ ${MERGE_TYPE} != "binary" ]] ; then
+		if [[ -d "${ESYSROOT}"/usr/lib/include ]] ; then
+			# bug #833620, bug #643302
+			eerror "Found ${ESYSROOT}/usr/lib/include directory!"
+			eerror "This is known to break glibc's build."
+			eerror "Please backup its contents then remove the directory."
+			die "Found directory (${ESYSROOT}/usr/lib/include) which will break build (bug #833620)!"
+		fi
+
+		if [[ ${CTARGET} == *-linux* ]] ; then
+			local run_kv build_kv want_kv
+
+			run_kv=$(g_get_running_KV)
+			build_kv=$(g_int_to_KV $(get_kheader_version))
+			want_kv=${MIN_KERN_VER}
+
+			if ! is_crosscompile && ! tc-is-cross-compiler ; then
+				# Building fails on an non-supporting kernel
+				ebegin "Checking running kernel version (${run_kv} >= ${want_kv})"
+				if ! eend_KV ${run_kv} ${want_kv} ; then
+					echo
+					eerror "You need a kernel of at least ${want_kv}!"
+					die "Kernel version too low!"
+				fi
+			fi
+
+			# Do not run this check for pkg_pretend, just pkg_setup and friends (if we ever get used there).
+			# It's plausible (seen it in the wild) that Portage will (correctly) schedule a linux-headers
+			# upgrade before glibc, but because pkg_pretend gets run before any packages are merged at all (not
+			# just glibc), the whole emerge gets aborted without a good reason. We probably don't
+			# need to run this check at all given we have a dependency on the right headers,
+			# but let's leave it as-is for now.
+			if [[ ${EBUILD_PHASE_FUNC} != pkg_pretend ]] ; then
+				ebegin "Checking linux-headers version (${build_kv} >= ${want_kv})"
+				if ! eend_KV ${build_kv} ${want_kv} ; then
+					echo
+					eerror "You need linux-headers of at least ${want_kv}!"
+					die "linux-headers version too low!"
+				fi
+			fi
+		fi
+	fi
+}
+
+upgrade_warning() {
+	is_crosscompile && return
+
+	if [[ ${MERGE_TYPE} != buildonly && -n ${REPLACING_VERSIONS} && -z ${ROOT} ]]; then
+		local oldv newv=$(ver_cut 1-2 ${PV})
+		for oldv in ${REPLACING_VERSIONS}; do
+			if ver_test ${oldv} -lt ${newv}; then
+				ewarn "After upgrading glibc, please restart all running processes."
+				ewarn "Be sure to include init (telinit u) or systemd (systemctl daemon-reexec)."
+				ewarn "Alternatively, reboot your system."
+				ewarn "(See bug #660556, bug #741116, bug #823756, etc)"
+				break
+			fi
+		done
+	fi
+}
+
+#
+# the phases
+#
+
+# pkg_pretend
+
+pkg_pretend() {
+	upgrade_warning
+}
+
+# pkg_setup
+
+pkg_setup() {
+	# see bug 682570
+	[[ -z ${BOOTSTRAP_RAP} ]] && python-any-r1_pkg_setup
+}
+
+# src_unpack
+
+src_unpack() {
+	setup_env
+
+	einfo "Checking general environment sanity."
+	sanity_prechecks
+
+	use multilib-bootstrap && unpack gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz
+
+	if [[ ${PV} == 9999* ]] ; then
+		EGIT_REPO_URI="https://anongit.gentoo.org/git/proj/toolchain/glibc-patches.git"
+		EGIT_CHECKOUT_DIR=${WORKDIR}/patches-git
+		git-r3_src_unpack
+		mv patches-git/9999 patches || die
+
+		EGIT_REPO_URI="https://sourceware.org/git/glibc.git"
+		EGIT_CHECKOUT_DIR=${S}
+		git-r3_src_unpack
+	else
+		unpack ${P}.tar.xz
+
+		cd "${WORKDIR}" || die
+		unpack glibc-${PV}-patches-${PATCH_VER}.tar.xz
+	fi
+
+	cd "${WORKDIR}" || die
+	use systemd && unpack glibc-systemd-${GLIBC_SYSTEMD_VER}.tar.gz
+}
+
+# src_prepare
+
+src_prepare() {
+	local patchsetname
+	if ! use vanilla ; then
+		if [[ ${PV} == 9999* ]] ; then
+			patchsetname="from git master"
+		else
+			patchsetname="${PV}-${PATCH_VER}"
+		fi
+		einfo "Applying Gentoo Glibc patchset ${patchsetname}"
+		eapply "${WORKDIR}"/patches
+		einfo "Done."
+	fi
+
+	default
+
+	gnuconfig_update
+
+	cd "${WORKDIR}" || die
+	find . -name configure -exec touch {} +
+
+	# Fix permissions on some of the scripts.
+	chmod u+x "${S}"/scripts/*.sh
+
+	cd "${S}" || die
+}
+
+# src_configure
+
+glibc_do_configure() {
+	dump_build_environment
+
+	local myconf=()
+
+	# Use '=strong' instead of '=all' to protect only functions
+	# worth protecting from stack smashes.
+	myconf+=( --enable-stack-protector=$(usex ssp strong no) )
+
+	# Keep a whitelist of targets supporing IFUNC. glibc's ./configure
+	# is not robust enough to detect proper support:
+	#    https://bugs.gentoo.org/641216
+	#    https://sourceware.org/PR22634#c0
+	case $(tc-arch ${CTARGET}) in
+		# Keep whitelist of targets where autodetection mostly works.
+		amd64|x86|sparc|ppc|ppc64|arm|arm64|s390|riscv|loong) ;;
+		# Blacklist everywhere else
+		*) myconf+=( libc_cv_ld_gnu_indirect_function=no ) ;;
+	esac
+
+	# Enable Intel Control-flow Enforcement Technology on amd64 if requested
+	case ${CTARGET} in
+		x86_64-*) myconf+=( $(use_enable cet) ) ;;
+		*) ;;
+	esac
+
+	[[ $(tc-is-softfloat) == "yes" ]] && myconf+=( --without-fp )
+
+	myconf+=( --enable-kernel=${MIN_KERN_VER} )
+
+	# Since SELinux support is only required for nscd, only enable it if:
+	# 1. USE selinux
+	# 2. only for the primary ABI on multilib systems
+	# 3. Not a crosscompile
+	if ! is_crosscompile && use selinux ; then
+		if use multilib ; then
+			if is_final_abi ; then
+				myconf+=( --with-selinux )
+			else
+				myconf+=( --without-selinux )
+			fi
+		else
+			myconf+=( --with-selinux )
+		fi
+	else
+		myconf+=( --without-selinux )
+	fi
+
+	# Force a few tests where we always know the answer but
+	# configure is incapable of finding it.
+	if is_crosscompile ; then
+		export \
+			libc_cv_c_cleanup=yes \
+			libc_cv_forced_unwind=yes
+	fi
+
+	myconf+=(
+		--disable-werror
+		--enable-bind-now
+		--enable-fortify-source
+		--build=${CBUILD_OPT:-${CBUILD}}
+		--host=${CTARGET_OPT:-${CTARGET}}
+		$(use_enable profile)
+		$(use_with gd)
+		--with-headers=$(build_eprefix)$(alt_build_headers)
+		--prefix="$(host_eprefix)/usr"
+		--sysconfdir="$(host_eprefix)/etc"
+		--localstatedir="$(host_eprefix)/var"
+		--libdir='$(prefix)'/$(get_libdir)
+		--mandir='$(prefix)'/share/man
+		--infodir='$(prefix)'/share/info
+		--libexecdir='$(libdir)'/misc/glibc
+		--with-bugurl=https://bugs.gentoo.org/
+		--with-pkgversion="$(glibc_banner)"
+		$(use_enable crypt)
+		$(use_multiarch || echo --disable-multi-arch)
+		$(use_enable systemtap)
+		$(use_enable nscd)
+
+		# /usr/bin/mtrace has a Perl shebang. Gentoo Prefix QA checks fail if
+		# Perl hasn't been installed inside the prefix yet and configure picks
+		# up a Perl from outside the prefix instead. configure will fail to
+		# execute Perl during configure if we're cross-compiling a prefix, but
+		# it will just disable mtrace in that case.
+		# Note: mtrace is needed by the test suite.
+		ac_cv_path_PERL="$(usex perl "${EPREFIX}"/usr/bin/perl $(usex test "${EPREFIX}"/usr/bin/perl $(usex doc "${EPREFIX}"/usr/bin/perl no)))"
+
+		# locale data is arch-independent
+		# https://bugs.gentoo.org/753740
+		libc_cv_complocaledir='${exec_prefix}/lib/locale'
+
+		# On aarch64 there is no way to override -mcpu=native, and if
+		# the current cpu does not support SVE configure fails.
+		# Let's boldly assume our toolchain can always build SVE instructions.
+		libc_cv_aarch64_sve_asm=yes
+
+		${EXTRA_ECONF}
+	)
+
+	# We rely on sys-libs/timezone-data for timezone tools normally.
+	myconf+=( $(use_enable vanilla timezone-tools) )
+
+	# These libs don't have configure flags.
+	ac_cv_lib_audit_audit_log_user_avc_message=$(usex audit || echo no)
+	ac_cv_lib_cap_cap_init=$(usex caps || echo no)
+
+	# There is no configure option for this and we need to export it
+	# since the glibc build will re-run configure on itself
+	export libc_cv_rootsbindir="$(host_eprefix)/sbin"
+	export libc_cv_slibdir="$(host_eprefix)/$(get_libdir)"
+
+	local builddir=$(builddir nptl)
+	mkdir -p "${builddir}"
+	cd "${builddir}"
+	set -- "${S}"/configure "${myconf[@]}"
+	echo "$@"
+	"$@" || die "failed to configure glibc"
+
+	# ia64 static cross-compilers are a pita in so much that they
+	# can't produce static ELFs (as the libgcc.a is broken).  so
+	# disable building of the programs for those targets if it
+	# doesn't work.
+	# XXX: We could turn this into a compiler test, but ia64 is
+	# the only one that matters, so this should be fine for now.
+	if is_crosscompile && [[ ${CTARGET} == ia64* ]] ; then
+		sed -i '1i+link-static = touch $@' config.make
+	fi
+
+	# If we're trying to migrate between ABI sets, we need
+	# to lie and use a local copy of gcc.  Like if the system
+	# is built with MULTILIB_ABIS="amd64 x86" but we want to
+	# add x32 to it, gcc/glibc don't yet support x32.
+	#
+	if [[ -n ${GCC_BOOTSTRAP_VER} ]] && use multilib-bootstrap ; then
+		echo 'int main(void){}' > "${T}"/test.c || die
+		if ! $(tc-getCC ${CTARGET}) ${CFLAGS} ${LDFLAGS} "${T}"/test.c -Wl,-emain -lgcc 2>/dev/null ; then
+			sed -i -e '/^CC = /s:$: -B$(objdir)/../'"gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}/${ABI}:" config.make || die
+		fi
+	fi
+}
+
+glibc_headers_configure() {
+	export ABI=default
+
+	local builddir=$(builddir "headers")
+	mkdir -p "${builddir}"
+	cd "${builddir}"
+
+	# if we don't have a compiler yet, we can't really test it now ...
+	# hopefully they don't affect header generation, so let's hope for
+	# the best here ...
+	local v vars=(
+		ac_cv_header_cpuid_h=yes
+		libc_cv_{386,390,alpha,arm,hppa,ia64,mips,{powerpc,sparc}{,32,64},sh,x86_64}_tls=yes
+		libc_cv_asm_cfi_directives=yes
+		libc_cv_broken_visibility_attribute=no
+		libc_cv_c_cleanup=yes
+		libc_cv_compiler_powerpc64le_binary128_ok=yes
+		libc_cv_forced_unwind=yes
+		libc_cv_gcc___thread=yes
+		libc_cv_mlong_double_128=yes
+		libc_cv_mlong_double_128ibm=yes
+		libc_cv_ppc_machine=yes
+		libc_cv_ppc_rel16=yes
+		libc_cv_predef_fortify_source=no
+		libc_cv_target_power8_ok=yes
+		libc_cv_visibility_attribute=yes
+		libc_cv_z_combreloc=yes
+		libc_cv_z_execstack=yes
+		libc_cv_z_initfirst=yes
+		libc_cv_z_nodelete=yes
+		libc_cv_z_nodlopen=yes
+		libc_cv_z_relro=yes
+		libc_mips_abi=${ABI}
+		libc_mips_float=$([[ $(tc-is-softfloat) == "yes" ]] && echo soft || echo hard)
+		# These libs don't have configure flags.
+		ac_cv_lib_audit_audit_log_user_avc_message=no
+		ac_cv_lib_cap_cap_init=no
+	)
+
+	einfo "Forcing cached settings:"
+	for v in "${vars[@]}" ; do
+		einfo " ${v}"
+		export ${v}
+	done
+
+	local headers_only_arch_CPPFLAGS=()
+
+	# Blow away some random CC settings that screw things up. #550192
+	if [[ -d ${S}/sysdeps/mips ]]; then
+		pushd "${S}"/sysdeps/mips >/dev/null
+		sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=32:' mips32/Makefile mips64/n32/Makefile || die
+		sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=64:' mips64/n64/Makefile || die
+
+		# Force the mips ABI to the default.  This is OK because the set of
+		# installed headers in this phase is the same between the 3 ABIs.
+		# If this ever changes, this hack will break, but that's unlikely
+		# as glibc discourages that behavior.
+		# https://crbug.com/647033
+		sed -i -e 's:abiflag=.*:abiflag=_ABIO32:' preconfigure || die
+
+		popd >/dev/null
+	fi
+
+	local myconf=()
+
+	case ${CTARGET} in
+	aarch64*)
+		# The configure checks fail during cross-build, so disable here
+		# for headers-only
+		myconf+=(
+			--disable-mathvec
+		) ;;
+	riscv*)
+		# RISC-V interrogates the compiler to determine which target to
+		# build.  If building the headers then we don't strictly need a
+		# RISC-V compiler, so the built-in definitions that are provided
+		# along with all RISC-V compiler might not exist.  This causes
+		# glibc's RISC-V preconfigure script to blow up.  Since we're just
+		# building the headers any value will actually work here, so just
+		# pick the standard one (rv64g/lp64d) to make the build scripts
+		# happy for now -- the headers are all the same anyway so it
+		# doesn't matter.
+		headers_only_arch_CPPFLAGS+=(
+			-D__riscv_xlen=64
+			-D__riscv_flen=64
+			-D__riscv_float_abi_double=1
+			-D__riscv_atomic=1
+		) ;;
+	esac
+
+	myconf+=(
+		--disable-sanity-checks
+		--enable-hacker-mode
+		--disable-werror
+		--enable-bind-now
+		--build=${CBUILD_OPT:-${CBUILD}}
+		--host=${CTARGET_OPT:-${CTARGET}}
+		--with-headers=$(build_eprefix)$(alt_build_headers)
+		--prefix="$(host_eprefix)/usr"
+		$(use_enable crypt)
+		${EXTRA_ECONF}
+	)
+
+	# Nothing is compiled here which would affect the headers for the target.
+	# So forcing CC/CFLAGS is sane.
+	local headers_only_CC=$(tc-getBUILD_CC)
+	local headers_only_CFLAGS="-O1 -pipe"
+	local headers_only_CPPFLAGS="-U_FORTIFY_SOURCE ${headers_only_arch_CPPFLAGS[*]}"
+	local headers_only_LDFLAGS=""
+	set -- "${S}"/configure "${myconf[@]}"
+	echo \
+		"CC=${headers_only_CC}" \
+		"CFLAGS=${headers_only_CFLAGS}" \
+		"CPPFLAGS=${headers_only_CPPFLAGS}" \
+		"LDFLAGS=${headers_only_LDFLAGS}" \
+		"$@"
+	CC=${headers_only_CC} \
+	CFLAGS=${headers_only_CFLAGS} \
+	CPPFLAGS=${headers_only_CPPFLAGS} \
+	LDFLAGS="" \
+	"$@" || die "failed to configure glibc"
+}
+
+do_src_configure() {
+	if just_headers ; then
+		glibc_headers_configure
+	else
+		glibc_do_configure nptl
+	fi
+}
+
+src_configure() {
+	foreach_abi do_src_configure
+}
+
+# src_compile
+
+do_src_compile() {
+	emake -C "$(builddir nptl)"
+}
+
+src_compile() {
+	if just_headers ; then
+		return
+	fi
+
+	foreach_abi do_src_compile
+}
+
+# src_test
+
+glibc_src_test() {
+	cd "$(builddir nptl)"
+
+	local myxfailparams=""
+	if [[ "${GENTOO_GLIBC_XFAIL_TESTS}" == "yes" ]] ; then
+		local virt=$(systemd-detect-virt 2>/dev/null)
+		if [[ ${virt} == systemd-nspawn ]] ; then
+			ewarn "Skipping extra tests because in systemd-nspawn container"
+			XFAIL_TEST_LIST+=( "${XFAIL_NSPAWN_TEST_LIST[@]}" )
+		fi
+
+		for myt in ${XFAIL_TEST_LIST[@]} ; do
+			myxfailparams+="test-xfail-${myt}=yes "
+		done
+	fi
+
+	# sandbox does not understand unshare() and prevents
+	# writes to /proc/, which makes many tests fail
+
+	# we give the tests a bit more time to avoid spurious
+	# bug reports on slow arches
+
+	SANDBOX_ON=0 LD_PRELOAD= TIMEOUTFACTOR=32 emake ${myxfailparams} check
+}
+
+src_test() {
+	if just_headers ; then
+		return
+	fi
+
+	foreach_abi glibc_src_test || die "tests failed"
+}
+
+# src_install
+
+run_locale_gen() {
+	# if the host locales.gen contains no entries, we'll install everything
+	local root="$1"
+	local inplace=""
+
+	if [[ "${root}" == "--inplace-glibc" ]] ; then
+		inplace="--inplace-glibc"
+		root="$2"
+	fi
+
+	local locale_list="${root%/}/etc/locale.gen"
+
+	pushd "${ED}"/$(get_libdir) >/dev/null
+
+	if [[ -z $(locale-gen --list --config "${locale_list}") ]] ; then
+		[[ -z ${inplace} ]] && ewarn "Generating all locales; edit /etc/locale.gen to save time/space"
+		locale_list="${root%/}/usr/share/i18n/SUPPORTED"
+	fi
+
+	# bug 736794: we need to be careful with the parallelization... the number of
+	# processors saved in the environment of a binary package may differ strongly
+	# from the number of processes available during postinst
+	local mygenjobs="$(makeopts_jobs)"
+	if [[ "${EMERGE_FROM}" == "binary" ]] ; then
+		mygenjobs="$(nproc)"
+	fi
+
+	set -- locale-gen ${inplace} --jobs "${mygenjobs}" --config "${locale_list}" \
+		--destdir "${root}"
+	echo "$@"
+	"$@"
+
+	popd >/dev/null
+}
+
+glibc_do_src_install() {
+	local builddir=$(builddir nptl)
+	cd "${builddir}"
+
+	emake install_root="${D}/$(build_eprefix)$(alt_prefix)" install
+
+	# This version (2.26) provides some compatibility libraries for the NIS/NIS+ support
+	# which come without headers etc. Only needed for binary packages since the
+	# external net-libs/libnsl has increased soversion. Keep only versioned libraries.
+	find "${D}" -name "libnsl.a" -delete
+	find "${D}" -name "libnsl.so" -delete
+
+	# Normally upstream_pv is ${PV}. Live ebuilds are exception, there we need
+	# to infer upstream version:
+	# '#define VERSION "2.26.90"' -> '2.26.90'
+	local upstream_pv=$(sed -n -r 's/#define VERSION "(.*)"/\1/p' "${S}"/version.h)
+
+	# Avoid stripping binaries not targeted by ${CHOST}. Or else
+	# ${CHOST}-strip would break binaries build for ${CTARGET}.
+	is_crosscompile && dostrip -x /
+
+	# gdb thread introspection relies on local libpthreads symbols. stripping breaks it
+	# See Note [Disable automatic stripping]
+	dostrip -x $(alt_libdir)/libpthread-${upstream_pv}.so
+	# valgrind requires knowledge about ld.so symbols.
+	dostrip -x $(alt_libdir)/ld-*.so*
+
+	if [[ -e ${ED}/$(alt_usrlibdir)/libm-${upstream_pv}.a ]] ; then
+		# Move versioned .a file out of libdir to evade portage QA checks
+		# instead of using gen_usr_ldscript(). We fix ldscript as:
+		# "GROUP ( /usr/lib64/libm-<pv>.a ..." -> "GROUP ( /usr/lib64/glibc-<pv>/libm-<pv>.a ..."
+		sed -i "s@\(libm-${upstream_pv}.a\)@${P}/\1@" "${ED}"/$(alt_usrlibdir)/libm.a || die
+		dodir $(alt_usrlibdir)/${P}
+		mv "${ED}"/$(alt_usrlibdir)/libm-${upstream_pv}.a "${ED}"/$(alt_usrlibdir)/${P}/libm-${upstream_pv}.a || die
+	fi
+
+	# We configure toolchains for standalone prefix systems with a sysroot,
+	# which is prepended to paths in ld scripts, so strip the prefix from these.
+	# Before: GROUP ( /foo/lib64/libc.so.6 /foo/usr/lib64/libc_nonshared.a  AS_NEEDED ( /foo/lib64/ld-linux-x86-64.so.2 ) )
+	# After: GROUP ( /lib64/libc.so.6 /usr/lib64/libc_nonshared.a  AS_NEEDED ( /lib64/ld-linux-x86-64.so.2 ) )
+	if [[ -n $(host_eprefix) ]] ; then
+		local file
+		grep -lZIF "ld script" "${ED}/$(alt_usrlibdir)"/lib*.{a,so} 2>/dev/null | while read -rd '' file ; do
+			sed -i "s|$(host_eprefix)/|/|g" "${file}" || die
+		done
+	fi
+
+	# We'll take care of the cache ourselves
+	rm -f "${ED}"/etc/ld.so.cache
+
+	# Everything past this point just needs to be done once ...
+	is_final_abi || return 0
+
+	# Make sure the non-native interp can be found on multilib systems even
+	# if the main library set isn't installed into the right place.  Maybe
+	# we should query the active gcc for info instead of hardcoding it ?
+	local i ldso_abi ldso_name
+	local ldso_abi_list=(
+		# x86
+		amd64   /lib64/ld-linux-x86-64.so.2
+		x32     /libx32/ld-linux-x32.so.2
+		x86     /lib/ld-linux.so.2
+		# mips
+		o32     /lib/ld.so.1
+		n32     /lib32/ld.so.1
+		n64     /lib64/ld.so.1
+		# powerpc
+		ppc     /lib/ld.so.1
+		# riscv
+		ilp32d  /lib/ld-linux-riscv32-ilp32d.so.1
+		ilp32   /lib/ld-linux-riscv32-ilp32.so.1
+		lp64d   /lib/ld-linux-riscv64-lp64d.so.1
+		lp64    /lib/ld-linux-riscv64-lp64.so.1
+		# s390
+		s390    /lib/ld.so.1
+		s390x   /lib/ld64.so.1
+		# sparc
+		sparc32 /lib/ld-linux.so.2
+		sparc64 /lib64/ld-linux.so.2
+	)
+	case $(tc-endian) in
+	little)
+		ldso_abi_list+=(
+			# arm
+			arm64   /lib/ld-linux-aarch64.so.1
+			# ELFv2 (glibc does not support ELFv1 on LE)
+			ppc64   /lib64/ld64.so.2
+		)
+		;;
+	big)
+		ldso_abi_list+=(
+			# arm
+			arm64   /lib/ld-linux-aarch64_be.so.1
+			# ELFv1 (glibc does not support ELFv2 on BE)
+			ppc64   /lib64/ld64.so.1
+		)
+		;;
+	esac
+	if [[ ${SYMLINK_LIB} == "yes" ]] && [[ ! -e ${ED}/$(alt_prefix)/lib ]] ; then
+		dosym $(get_abi_LIBDIR ${DEFAULT_ABI}) $(alt_prefix)/lib
+	fi
+	for (( i = 0; i < ${#ldso_abi_list[@]}; i += 2 )) ; do
+		ldso_abi=${ldso_abi_list[i]}
+		has ${ldso_abi} $(get_install_abis) || continue
+
+		ldso_name="$(alt_prefix)${ldso_abi_list[i+1]}"
+		if [[ ! -L ${ED}/${ldso_name} && ! -e ${ED}/${ldso_name} ]] ; then
+			dosym ../$(get_abi_LIBDIR ${ldso_abi})/${ldso_name##*/} ${ldso_name}
+		fi
+	done
+
+	# In the LSB 5.0 definition, someone had the excellent idea to "standardize"
+	# the runtime loader name, see also https://xkcd.com/927/
+	# Normally, in Gentoo one should never come across executables that require this.
+	# However, binary commercial packages are known to adhere to weird practices.
+	# https://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-AMD64/LSB-Core-AMD64.html#BASELIB
+	local lsb_ldso_name native_ldso_name lsb_ldso_abi
+	local lsb_ldso_abi_list=(
+		# x86
+		amd64	ld-linux-x86-64.so.2	ld-lsb-x86-64.so.3
+	)
+	for (( i = 0; i < ${#lsb_ldso_abi_list[@]}; i += 3 )) ; do
+		lsb_ldso_abi=${lsb_ldso_abi_list[i]}
+		native_ldso_name=${lsb_ldso_abi_list[i+1]}
+		lsb_ldso_name=${lsb_ldso_abi_list[i+2]}
+		has ${lsb_ldso_abi} $(get_install_abis) || continue
+
+		if [[ ! -L ${ED}/$(get_abi_LIBDIR ${lsb_ldso_abi})/${lsb_ldso_name} && ! -e ${ED}/$(get_abi_LIBDIR ${lsb_ldso_abi})/${lsb_ldso_name} ]] ; then
+			dosym ${native_ldso_name} "$(alt_prefix)/$(get_abi_LIBDIR ${lsb_ldso_abi})/${lsb_ldso_name}"
+		fi
+	done
+
+	# With devpts under Linux mounted properly, we do not need the pt_chown
+	# binary to be setuid.  This is because the default owners/perms will be
+	# exactly what we want.
+	if ! use suid ; then
+		find "${ED}" -name pt_chown -exec chmod -s {} +
+	fi
+
+	#################################################################
+	# EVERYTHING AFTER THIS POINT IS FOR NATIVE GLIBC INSTALLS ONLY #
+	#################################################################
+
+	# Make sure we install some symlink hacks so that when we build
+	# a 2nd stage cross-compiler, gcc finds the target system
+	# headers correctly.  See gcc/doc/gccinstall.info
+	if is_crosscompile ; then
+		# We need to make sure that /lib and /usr/lib always exists.
+		# gcc likes to use relative paths to get to its multilibs like
+		# /usr/lib/../lib64/.  So while we don't install any files into
+		# /usr/lib/, we do need it to exist.
+		keepdir $(alt_prefix)/lib
+		keepdir $(alt_prefix)/usr/lib
+
+		dosym usr/include $(alt_prefix)/sys-include
+		return 0
+	fi
+
+	# Files for Debian-style locale updating
+	dodir /usr/share/i18n
+	sed \
+		-e "/^#/d" \
+		-e "/SUPPORTED-LOCALES=/d" \
+		-e "s: \\\\::g" -e "s:/: :g" \
+		"${S}"/localedata/SUPPORTED > "${ED}"/usr/share/i18n/SUPPORTED \
+		|| die "generating /usr/share/i18n/SUPPORTED failed"
+
+	cd "${S}" || die
+
+	# Install misc network config files
+	insinto /etc
+	doins posix/gai.conf
+
+	if use systemd ; then
+		doins "${WORKDIR}/glibc-systemd-${GLIBC_SYSTEMD_VER}/gentoo-config/nsswitch.conf"
+	else
+		doins nss/nsswitch.conf
+	fi
+
+	# Gentoo-specific
+	newins "${FILESDIR}"/host.conf-1 host.conf
+
+	if use nscd ; then
+		doins nscd/nscd.conf
+
+		newinitd "$(prefixify_ro "${FILESDIR}"/nscd-1)" nscd
+
+		local nscd_args=(
+			-e "s:@PIDFILE@:$(strings "${ED}"/usr/sbin/nscd | grep nscd.pid):"
+		)
+
+		sed -i "${nscd_args[@]}" "${ED}"/etc/init.d/nscd
+
+		use systemd && systemd_dounit nscd/nscd.service
+		newtmpfiles nscd/nscd.tmpfiles nscd.conf
+	fi
+
+	echo 'LDPATH="include ld.so.conf.d/*.conf"' > "${T}"/00glibc
+	doenvd "${T}"/00glibc
+
+	for d in BUGS ChangeLog CONFORMANCE FAQ NEWS NOTES PROJECTS README* ; do
+		[[ -s ${d} ]] && dodoc ${d}
+	done
+	dodoc -r ChangeLog.old
+
+	# Prevent overwriting of the /etc/localtime symlink.  We'll handle the
+	# creation of the "factory" symlink in pkg_postinst().
+	rm -f "${ED}"/etc/localtime
+
+	# Generate all locales if this is a native build as locale generation
+	if use compile-locales && ! is_crosscompile ; then
+		run_locale_gen --inplace-glibc "${ED}/"
+	fi
+}
+
+glibc_headers_install() {
+	local builddir=$(builddir "headers")
+	cd "${builddir}"
+	emake install_root="${D}/$(build_eprefix)$(alt_prefix)" install-headers
+
+	insinto $(alt_headers)/gnu
+	doins "${S}"/include/gnu/stubs.h
+
+	# Make sure we install the sys-include symlink so that when
+	# we build a 2nd stage cross-compiler, gcc finds the target
+	# system headers correctly.  See gcc/doc/gccinstall.info
+	dosym usr/include $(alt_prefix)/sys-include
+}
+
+src_install() {
+	if just_headers ; then
+		export ABI=default
+		glibc_headers_install
+		return
+	fi
+
+	foreach_abi glibc_do_src_install
+
+	if ! use static-libs ; then
+		einfo "Not installing static glibc libraries"
+		find "${ED}" -name "*.a" -and -not -name "*_nonshared.a" -delete
+	fi
+}
+
+# Simple test to make sure our new glibc isn't completely broken.
+# Make sure we don't test with statically built binaries since
+# they will fail.  Also, skip if this glibc is a cross compiler.
+#
+# If coreutils is built with USE=multicall, some of these files
+# will just be wrapper scripts, not actual ELFs we can test.
+glibc_sanity_check() {
+	cd / #228809
+
+	# We enter ${ED} so to avoid trouble if the path contains
+	# special characters; for instance if the path contains the
+	# colon character (:), then the linker will try to split it
+	# and look for the libraries in an unexpected place. This can
+	# lead to unsafe code execution if the generated prefix is
+	# within a world-writable directory.
+	# (e.g. /var/tmp/portage:${HOSTNAME})
+	pushd "${ED}"/$(get_libdir) >/dev/null
+
+	# first let's find the actual dynamic linker here
+	# symlinks may point to the wrong abi
+	local newldso=$(find . -maxdepth 1 -name 'ld*so.?' -type f -print -quit)
+
+	einfo Last-minute run tests with ${newldso} in /$(get_libdir) ...
+
+	local x striptest
+	for x in cal date env free ls true uname uptime ; do
+		x=$(type -p ${x})
+		[[ -z ${x} || ${x} != ${EPREFIX}/* ]] && continue
+		striptest=$(LC_ALL="C" file -L ${x} 2>/dev/null) || continue
+		case ${striptest} in
+		*"statically linked"*) continue;;
+		*"ASCII text"*) continue;;
+		esac
+		# We need to clear the locale settings as the upgrade might want
+		# incompatible locale data.  This test is not for verifying that.
+		LC_ALL=C \
+		${newldso} --library-path . ${x} > /dev/null \
+			|| die "simple run test (${x}) failed"
+	done
+
+	popd >/dev/null
+}
+
+pkg_preinst() {
+	# nothing to do if just installing headers
+	just_headers && return
+
+	einfo "Checking general environment sanity."
+	sanity_prechecks
+
+	# prepare /etc/ld.so.conf.d/ for files
+	mkdir -p "${EROOT}"/etc/ld.so.conf.d
+
+	# Default /etc/hosts.conf:multi to on for systems with small dbs.
+	if [[ $(wc -l < "${EROOT}"/etc/hosts) -lt 1000 ]] ; then
+		sed -i '/^multi off/s:off:on:' "${ED}"/etc/host.conf
+		einfo "Defaulting /etc/host.conf:multi to on"
+	fi
+
+	[[ -n ${ROOT} ]] && return 0
+	[[ -d ${ED}/$(get_libdir) ]] || return 0
+	[[ -z ${BOOTSTRAP_RAP} ]] && glibc_sanity_check
+
+	if [[ -L ${EROOT}/usr/lib/locale ]]; then
+		# Help portage migrate this to a directory
+		# https://bugs.gentoo.org/753740
+		rm "${EROOT}"/usr/lib/locale || die
+	fi
+
+	# Keep around libcrypt so that Perl doesn't break when merging libxcrypt
+	# (libxcrypt is the new provider for now of libcrypt.so.{1,2}).
+	# bug #802207
+	if ! use crypt && has_version "${CATEGORY}/${PN}[crypt]" && ! has preserve-libs ${FEATURES}; then
+		PRESERVED_OLD_LIBCRYPT=1
+		cp -p "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" "${T}/libcrypt$(get_libname 1)" || die
+	else
+		PRESERVED_OLD_LIBCRYPT=0
+	fi
+}
+
+glibc_refresh_ldconfig() {
+	if [[ ${MERGE_TYPE} == buildonly ]]; then
+		return
+	fi
+
+	# Version check could be added to avoid unnecessary work, but ldconfig
+	# should finish quickly enough to not matter.
+	ebegin "Refreshing ld.so.cache"
+	ldconfig -i
+	if ! eend $?; then
+		ewarn "Failed to refresh the ld.so.cache for you. Some programs may be broken"
+		ewarn "before you manually do so (ldconfig -i)."
+	fi
+}
+
+pkg_postinst() {
+	# nothing to do if just installing headers
+	just_headers && return
+
+	if ! tc-is-cross-compiler && [[ -x ${EROOT}/usr/sbin/iconvconfig ]] ; then
+		# Generate fastloading iconv module configuration file.
+		"${EROOT}"/usr/sbin/iconvconfig --prefix="${ROOT}/"
+	fi
+
+	if ! is_crosscompile && [[ -z ${ROOT} ]] ; then
+		# glibc-2.38+ on loong has ldconfig support added, but the ELF e_flags
+		# handling has changed as well, which means stale ldconfig auxiliary
+		# cache entries and failure to lookup libgcc_s / libstdc++ (breaking
+		# every C++ application) / libgomp etc., among other breakages.
+		#
+		# To fix this, simply refresh the ld.so.cache without using the
+		# auxiliary cache if we're natively installing on loong. This should
+		# be done relatively soon because we want to minimize the breakage
+		# window for the affected programs.
+		use loong && glibc_refresh_ldconfig
+
+		use compile-locales || run_locale_gen "${EROOT}/"
+	fi
+
+	upgrade_warning
+
+	# Check for sanity of /etc/nsswitch.conf, take 2
+	if [[ -e ${EROOT}/etc/nsswitch.conf ]] && ! has_version sys-auth/libnss-nis ; then
+		local entry
+		for entry in passwd group shadow; do
+			if grep -E -q "^[ \t]*${entry}:.*nis" "${EROOT}"/etc/nsswitch.conf; then
+				ewarn ""
+				ewarn "Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been"
+				ewarn "removed from glibc and is now provided by the package"
+				ewarn "  sys-auth/libnss-nis"
+				ewarn "Install it now to keep your NIS setup working."
+				ewarn ""
+			fi
+		done
+	fi
+
+	if [[ ${PRESERVED_OLD_LIBCRYPT} -eq 1 ]] ; then
+		cp -p "${T}/libcrypt$(get_libname 1)" "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" || die
+		preserve_old_lib_notify /$(get_libdir)/libcrypt$(get_libname 1)
+
+		elog "Please ignore a possible later error message about a file collision involving"
+		elog "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1). We need to preserve this file for the moment to keep"
+		elog "the upgrade working, but it also needs to be overwritten when"
+		elog "sys-libs/libxcrypt is installed. See bug 802210 for more details."
+	fi
+}
diff --git a/sys-libs/glibc/glibc-2.39-r3.ebuild b/sys-libs/glibc/glibc-2.39-r3.ebuild
index 1e6aadbb04e3..8a1b09f69a23 100644
--- a/sys-libs/glibc/glibc-2.39-r3.ebuild
+++ b/sys-libs/glibc/glibc-2.39-r3.ebuild
@@ -9,14 +9,6 @@ EAPI=8
 PYTHON_COMPAT=( python3_{10..12} )
 TMPFILES_OPTIONAL=1
 
-inherit python-any-r1 prefix preserve-libs toolchain-funcs flag-o-matic gnuconfig \
-	multilib systemd multiprocessing tmpfiles
-
-DESCRIPTION="GNU libc C library"
-HOMEPAGE="https://www.gnu.org/software/libc/"
-LICENSE="LGPL-2.1+ BSD HPND ISC inner-net rc PCRE"
-SLOT="2.2"
-
 EMULTILIB_PKG="true"
 
 # Gentoo patchset (ignored for live ebuilds)
@@ -40,6 +32,12 @@ MIN_PAX_UTILS_VER="1.3.3"
 # its seccomp filter!). Please double check this!
 MIN_SYSTEMD_VER="254.9-r1"
 
+inherit python-any-r1 prefix preserve-libs toolchain-funcs flag-o-matic gnuconfig \
+	multilib systemd multiprocessing tmpfiles
+
+DESCRIPTION="GNU libc C library"
+HOMEPAGE="https://www.gnu.org/software/libc/"
+
 if [[ ${PV} == 9999* ]]; then
 	inherit git-r3
 else
@@ -51,6 +49,8 @@ fi
 SRC_URI+=" multilib-bootstrap? ( https://dev.gentoo.org/~dilfridge/distfiles/gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz )"
 SRC_URI+=" systemd? ( https://gitweb.gentoo.org/proj/toolchain/glibc-systemd.git/snapshot/glibc-systemd-${GLIBC_SYSTEMD_VER}.tar.gz )"
 
+LICENSE="LGPL-2.1+ BSD HPND ISC inner-net rc PCRE"
+SLOT="2.2"
 IUSE="audit caps cet compile-locales custom-cflags doc gd hash-sysv-compat headers-only +multiarch multilib multilib-bootstrap nscd perl profile selinux +ssp stack-realign +static-libs suid systemd systemtap test vanilla"
 
 # Here's how the cross-compile logic breaks down ...
@@ -213,7 +213,9 @@ XFAIL_NSPAWN_TEST_LIST=(
 dump_build_environment() {
 	einfo ==== glibc build environment ========================================================
 	local v
-	for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC CXX CPP LD {AS,C,CPP,CXX,LD}FLAGS MAKEINFO NM AR AS STRIP RANLIB OBJCOPY STRINGS OBJDUMP READELF; do
+	for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC CXX CPP LD \
+		{AS,C,CPP,CXX,LD}FLAGS MAKEINFO NM AR AS STRIP RANLIB OBJCOPY \
+		STRINGS OBJDUMP READELF; do
 		einfo " $(printf '%15s' ${v}:)   ${!v}"
 	done
 	einfo =====================================================================================
@@ -256,7 +258,9 @@ alt_build_headers() {
 		if tc-is-cross-compiler ; then
 			ALT_BUILD_HEADERS=${SYSROOT}$(alt_headers)
 			if [[ ! -e ${ALT_BUILD_HEADERS}/linux/version.h ]] ; then
-				local header_path=$(echo '#include <linux/version.h>' | $(tc-getCPP ${CTARGET}) ${CFLAGS} 2>&1 | grep -o '[^"]*linux/version.h')
+				local header_path=$(echo '#include <linux/version.h>' \
+					| $(tc-getCPP ${CTARGET}) ${CFLAGS} 2>&1 \
+					| grep -o '[^"]*linux/version.h')
 				ALT_BUILD_HEADERS=${header_path%/linux/version.h}
 			fi
 		fi
@@ -1363,9 +1367,11 @@ glibc_do_src_install() {
 		# Move versioned .a file out of libdir to evade portage QA checks
 		# instead of using gen_usr_ldscript(). We fix ldscript as:
 		# "GROUP ( /usr/lib64/libm-<pv>.a ..." -> "GROUP ( /usr/lib64/glibc-<pv>/libm-<pv>.a ..."
-		sed -i "s@\(libm-${upstream_pv}.a\)@${P}/\1@" "${ED}"/$(alt_usrlibdir)/libm.a || die
+		sed -i "s@\(libm-${upstream_pv}.a\)@${P}/\1@" \
+			"${ED}"/$(alt_usrlibdir)/libm.a || die
 		dodir $(alt_usrlibdir)/${P}
-		mv "${ED}"/$(alt_usrlibdir)/libm-${upstream_pv}.a "${ED}"/$(alt_usrlibdir)/${P}/libm-${upstream_pv}.a || die
+		mv "${ED}"/$(alt_usrlibdir)/libm-${upstream_pv}.a \
+			"${ED}"/$(alt_usrlibdir)/${P}/libm-${upstream_pv}.a || die
 	fi
 
 	# We configure toolchains for standalone prefix systems with a sysroot,
@@ -1650,7 +1656,8 @@ pkg_preinst() {
 	# bug #802207
 	if has_version "${CATEGORY}/${PN}[crypt]" && ! has preserve-libs ${FEATURES}; then
 		PRESERVED_OLD_LIBCRYPT=1
-		cp -p "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" "${T}/libcrypt$(get_libname 1)" || die
+		cp -p "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" \
+			"${T}/libcrypt$(get_libname 1)" || die
 	else
 		PRESERVED_OLD_LIBCRYPT=0
 	fi
diff --git a/sys-libs/glibc/glibc-2.39-r4.ebuild b/sys-libs/glibc/glibc-2.39-r4.ebuild
new file mode 100644
index 000000000000..5d05b046a06e
--- /dev/null
+++ b/sys-libs/glibc/glibc-2.39-r4.ebuild
@@ -0,0 +1,1731 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# Bumping notes: https://wiki.gentoo.org/wiki/Project:Toolchain/sys-libs/glibc
+# Please read & adapt the page as necessary if obsolete.
+
+PYTHON_COMPAT=( python3_{10..12} )
+TMPFILES_OPTIONAL=1
+
+EMULTILIB_PKG="true"
+
+# Gentoo patchset (ignored for live ebuilds)
+PATCH_VER=4
+PATCH_DEV=dilfridge
+
+# gcc mulitilib bootstrap files version
+GCC_BOOTSTRAP_VER=20201208
+
+# systemd integration version
+GLIBC_SYSTEMD_VER=20210729
+
+# Minimum kernel version that glibc requires
+MIN_KERN_VER="3.2.0"
+
+# Minimum pax-utils version needed (which contains any new syscall changes for
+# its seccomp filter!). Please double check this!
+MIN_PAX_UTILS_VER="1.3.3"
+
+# Minimum systemd version needed (which contains any new syscall changes for
+# its seccomp filter!). Please double check this!
+MIN_SYSTEMD_VER="254.9-r1"
+
+inherit python-any-r1 prefix preserve-libs toolchain-funcs flag-o-matic gnuconfig \
+	multilib systemd multiprocessing tmpfiles
+
+DESCRIPTION="GNU libc C library"
+HOMEPAGE="https://www.gnu.org/software/libc/"
+
+if [[ ${PV} == 9999* ]]; then
+	inherit git-r3
+else
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa -ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+	SRC_URI="mirror://gnu/glibc/${P}.tar.xz"
+	SRC_URI+=" https://dev.gentoo.org/~${PATCH_DEV}/distfiles/${P}-patches-${PATCH_VER}.tar.xz"
+fi
+
+SRC_URI+=" multilib-bootstrap? ( https://dev.gentoo.org/~dilfridge/distfiles/gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz )"
+SRC_URI+=" systemd? ( https://gitweb.gentoo.org/proj/toolchain/glibc-systemd.git/snapshot/glibc-systemd-${GLIBC_SYSTEMD_VER}.tar.gz )"
+
+LICENSE="LGPL-2.1+ BSD HPND ISC inner-net rc PCRE"
+SLOT="2.2"
+IUSE="audit caps cet compile-locales custom-cflags doc gd hash-sysv-compat headers-only +multiarch multilib multilib-bootstrap nscd perl profile selinux +ssp stack-realign +static-libs suid systemd systemtap test vanilla"
+
+# Here's how the cross-compile logic breaks down ...
+#  CTARGET - machine that will target the binaries
+#  CHOST   - machine that will host the binaries
+#  CBUILD  - machine that will build the binaries
+# If CTARGET != CHOST, it means you want a libc for cross-compiling.
+# If CHOST != CBUILD, it means you want to cross-compile the libc.
+#  CBUILD = CHOST = CTARGET    - native build/install
+#  CBUILD != (CHOST = CTARGET) - cross-compile a native build
+#  (CBUILD = CHOST) != CTARGET - libc for cross-compiler
+#  CBUILD != CHOST != CTARGET  - cross-compile a libc for a cross-compiler
+# For install paths:
+#  CHOST = CTARGET  - install into /
+#  CHOST != CTARGET - install into /usr/CTARGET/
+#
+export CBUILD=${CBUILD:-${CHOST}}
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} == ${CHOST} ]] ; then
+	if [[ ${CATEGORY} == cross-* ]] ; then
+		export CTARGET=${CATEGORY#cross-}
+	fi
+fi
+
+# Note [Disable automatic stripping]
+# Disabling automatic stripping for a few reasons:
+# - portage's attempt to strip breaks non-native binaries at least on
+#   arm: bug #697428
+# - portage's attempt to strip libpthread.so.0 breaks gdb thread
+#   enumeration: bug #697910. This is quite subtle:
+#   * gdb uses glibc's libthread_db-1.0.so to enumerate threads.
+#   * libthread_db-1.0.so needs access to libpthread.so.0 local symbols
+#     via 'ps_pglobal_lookup' symbol defined in gdb.
+#   * 'ps_pglobal_lookup' uses '.symtab' section table to resolve all
+#     known symbols in 'libpthread.so.0'. Specifically 'nptl_version'
+#     (unexported) is used to sanity check compatibility before enabling
+#     debugging.
+#     Also see https://sourceware.org/gdb/wiki/FAQ#GDB_does_not_see_any_threads_besides_the_one_in_which_crash_occurred.3B_or_SIGTRAP_kills_my_program_when_I_set_a_breakpoint
+#   * normal 'strip' command trims '.symtab'
+#   Thus our main goal here is to prevent 'libpthread.so.0' from
+#   losing it's '.symtab' entries.
+# - similarly, valgrind requires knowledge about symbols in ld.so:
+#	bug #920753
+# As Gentoo's strip does not allow us to pass less aggressive stripping
+# options and does not check the machine target we strip selectively.
+
+# We need a new-enough binutils/gcc to match upstream baseline.
+# Also we need to make sure our binutils/gcc supports TLS,
+# and that gcc already contains the hardened patches.
+# Lastly, let's avoid some openssh nastiness, bug 708224, as
+# convenience to our users.
+
+IDEPEND="
+	!compile-locales? ( sys-apps/locale-gen )
+"
+BDEPEND="
+	${PYTHON_DEPS}
+	>=app-misc/pax-utils-${MIN_PAX_UTILS_VER}
+	sys-devel/bison
+	compile-locales? ( sys-apps/locale-gen )
+	doc? (
+		dev-lang/perl
+		sys-apps/texinfo
+	)
+	test? (
+		dev-lang/perl
+		>=net-dns/libidn2-2.3.0
+	)
+"
+COMMON_DEPEND="
+	gd? ( media-libs/gd:2= )
+	nscd? ( selinux? (
+		audit? ( sys-process/audit )
+		caps? ( sys-libs/libcap )
+	) )
+	suid? ( caps? ( sys-libs/libcap ) )
+	selinux? ( sys-libs/libselinux )
+	systemtap? ( dev-debug/systemtap )
+"
+DEPEND="${COMMON_DEPEND}
+"
+RDEPEND="${COMMON_DEPEND}
+	!<app-misc/pax-utils-${MIN_PAX_UTILS_VER}
+	!<sys-apps/systemd-${MIN_SYSTEMD_VER}
+	perl? ( dev-lang/perl )
+"
+
+RESTRICT="!test? ( test )"
+
+if [[ ${CATEGORY} == cross-* ]] ; then
+	BDEPEND+=" !headers-only? (
+		>=${CATEGORY}/binutils-2.27
+		>=${CATEGORY}/gcc-6.2
+	)"
+	[[ ${CATEGORY} == *-linux* ]] && DEPEND+=" ${CATEGORY}/linux-headers"
+else
+	BDEPEND+="
+		>=sys-devel/binutils-2.27
+		>=sys-devel/gcc-6.2
+	"
+	DEPEND+=" virtual/os-headers "
+	RDEPEND+="
+		>=net-dns/libidn2-2.3.0
+		vanilla? ( !sys-libs/timezone-data )
+	"
+	PDEPEND+=" !vanilla? ( sys-libs/timezone-data )"
+fi
+
+# Ignore tests whitelisted below
+GENTOO_GLIBC_XFAIL_TESTS="${GENTOO_GLIBC_XFAIL_TESTS:-yes}"
+
+# The following tests fail due to the Gentoo build system and are thus
+# executed but ignored:
+XFAIL_TEST_LIST=(
+	# buggy test, assumes /dev/ and /dev/null on a single filesystem
+	# 'mount --bind /dev/null /chroot/dev/null' breaks it.
+	# https://sourceware.org/PR25909
+	tst-support_descriptors
+
+	# The following tests fail only inside portage
+	# https://bugs.gentoo.org/831267
+	tst-system
+	tst-strerror
+	tst-strsignal
+
+	# Fails with certain PORTAGE_NICENESS/PORTAGE_SCHEDULING_POLICY
+	tst-sched1
+
+	# Fails regularly, unreliable
+	tst-valgrind-smoke
+)
+
+XFAIL_NSPAWN_TEST_LIST=(
+	# These tests need to be adapted to handle EPERM/ENOSYS(?) properly
+	# upstream, as systemd-nspawn's default seccomp whitelist is too strict.
+	# https://sourceware.org/PR30603
+	test-errno-linux
+	tst-bz21269
+	tst-mlock2
+	tst-ntp_gettime
+	tst-ntp_gettime-time64
+	tst-ntp_gettimex
+	tst-ntp_gettimex-time64
+	tst-pkey
+	tst-process_mrelease
+	tst-adjtime
+	tst-adjtime-time64
+	tst-clock2
+	tst-clock2-time64
+
+	# These fail if --suppress-sync and/or low priority is set
+	tst-sync_file_range
+	test-errno
+)
+
+#
+# Small helper functions
+#
+
+dump_build_environment() {
+	einfo ==== glibc build environment ========================================================
+	local v
+	for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC CXX CPP LD \
+		{AS,C,CPP,CXX,LD}FLAGS MAKEINFO NM AR AS STRIP RANLIB OBJCOPY \
+		STRINGS OBJDUMP READELF; do
+		einfo " $(printf '%15s' ${v}:)   ${!v}"
+	done
+	einfo =====================================================================================
+}
+
+is_crosscompile() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+
+just_headers() {
+	is_crosscompile && use headers-only
+}
+
+alt_prefix() {
+	is_crosscompile && echo /usr/${CTARGET}
+}
+
+# This prefix is applicable to CHOST when building against this
+# glibc. It is baked into the library at configure time.
+host_eprefix() {
+	is_crosscompile || echo "${EPREFIX}"
+}
+
+# This prefix is applicable to CBUILD when building against this
+# glibc. It determines the destination path at install time.
+build_eprefix() {
+	is_crosscompile && echo "${EPREFIX}"
+}
+
+# We need to be able to set alternative headers for compiling for non-native
+# platform. Will also become useful for testing kernel-headers without screwing
+# up the whole system.
+alt_headers() {
+	echo ${ALT_HEADERS:=$(alt_prefix)/usr/include}
+}
+
+alt_build_headers() {
+	if [[ -z ${ALT_BUILD_HEADERS} ]] ; then
+		ALT_BUILD_HEADERS="$(host_eprefix)$(alt_headers)"
+		if tc-is-cross-compiler ; then
+			ALT_BUILD_HEADERS=${SYSROOT}$(alt_headers)
+			if [[ ! -e ${ALT_BUILD_HEADERS}/linux/version.h ]] ; then
+				local header_path=$(echo '#include <linux/version.h>' \
+					| $(tc-getCPP ${CTARGET}) ${CFLAGS} 2>&1 \
+					| grep -o '[^"]*linux/version.h')
+				ALT_BUILD_HEADERS=${header_path%/linux/version.h}
+			fi
+		fi
+	fi
+	echo "${ALT_BUILD_HEADERS}"
+}
+
+alt_libdir() {
+	echo $(alt_prefix)/$(get_libdir)
+}
+alt_usrlibdir() {
+	echo $(alt_prefix)/usr/$(get_libdir)
+}
+
+builddir() {
+	echo "${WORKDIR}/build-${ABI}-${CTARGET}-$1"
+}
+
+do_compile_test() {
+	local ret save_cflags=${CFLAGS}
+	CFLAGS+=" $1"
+	shift
+
+	pushd "${T}" >/dev/null
+
+	rm -f glibc-test*
+	printf '%b' "$*" > glibc-test.c
+
+	# We assume CC is already set up.
+	nonfatal emake glibc-test
+	ret=$?
+
+	popd >/dev/null
+
+	CFLAGS=${save_cflags}
+	return ${ret}
+}
+
+do_run_test() {
+	local ret
+
+	if [[ ${MERGE_TYPE} == "binary" ]] ; then
+		# ignore build failures when installing a binary package #324685
+		do_compile_test "" "$@" 2>/dev/null || return 0
+	else
+		if ! do_compile_test "" "$@" ; then
+			ewarn "Simple build failed ... assuming this is desired #324685"
+			return 0
+		fi
+	fi
+
+	pushd "${T}" >/dev/null
+
+	./glibc-test
+	ret=$?
+	rm -f glibc-test*
+
+	popd >/dev/null
+
+	return ${ret}
+}
+
+setup_target_flags() {
+	# This largely mucks with compiler flags.  None of which should matter
+	# when building up just the headers.
+	just_headers && return 0
+
+	case $(tc-arch) in
+		x86)
+			# -march needed for #185404 #199334
+			# TODO: When creating the first glibc cross-compile, this test will
+			# always fail as it does a full link which in turn requires glibc.
+			# Probably also applies when changing multilib profile settings (e.g.
+			# enabling x86 when the profile was amd64-only previously).
+			# We could change main to _start and pass -nostdlib here so that we
+			# only test the gcc code compilation.  Or we could do a compile and
+			# then look for the symbol via scanelf.
+			if ! do_compile_test "" 'void f(int i, void *p) {if (__sync_fetch_and_add(&i, 1)) f(i, p);}\nint main(){return 0;}\n'; then
+				local t=${CTARGET_OPT:-${CTARGET}}
+				t=${t%%-*}
+				filter-flags '-march=*'
+				export CFLAGS="-march=${t} ${CFLAGS}"
+				einfo "Auto adding -march=${t} to CFLAGS #185404"
+			fi
+			# For compatibility with older binaries at slight performance cost.
+			use stack-realign && export CFLAGS+=" -mstackrealign"
+		;;
+		amd64)
+			# -march needed for #185404 #199334
+			# TODO: See cross-compile issues listed above for x86.
+			if [[ ${ABI} == x86 ]]; then
+				if ! do_compile_test "${CFLAGS_x86}" 'void f(int i, void *p) {if (__sync_fetch_and_add(&i, 1)) f(i, p);}\nint main(){return 0;}\n'; then
+					local t=${CTARGET_OPT:-${CTARGET}}
+					t=${t%%-*}
+					# Normally the target is x86_64-xxx, so turn that into the -march that
+					# gcc actually accepts. #528708
+					[[ ${t} == "x86_64" ]] && t="x86-64"
+					filter-flags '-march=*'
+					# ugly, ugly, ugly.  ugly.
+					CFLAGS_x86=$(CFLAGS=${CFLAGS_x86} filter-flags '-march=*'; echo "${CFLAGS}")
+					export CFLAGS_x86="${CFLAGS_x86} -march=${t}"
+					einfo "Auto adding -march=${t} to CFLAGS_x86 #185404 (ABI=${ABI})"
+				fi
+				# For compatibility with older binaries at slight performance cost.
+				use stack-realign && export CFLAGS_x86+=" -mstackrealign"
+
+				# Workaround for bug #823780.
+				# Need to save/restore CC because earlier on, we stuff it full of CFLAGS, and tc-getCPP doesn't like that.
+				CC_mangled=${CC}
+				CC=${glibc__GLIBC_CC}
+				if tc-is-gcc && (($(gcc-major-version) == 11)) && (($(gcc-minor-version) <= 2)) && (($(gcc-micro-version) == 0)) ; then
+					export CFLAGS_x86="${CFLAGS_x86} -mno-avx512f"
+					einfo "Auto adding -mno-avx512f to CFLAGS_x86 for buggy GCC version (bug #823780) (ABI=${ABI})"
+				fi
+				CC=${CC_mangled}
+			fi
+		;;
+		mips)
+			# The mips abi cannot support the GNU style hashes. #233233
+			filter-ldflags -Wl,--hash-style=gnu -Wl,--hash-style=both
+		;;
+		ppc|ppc64)
+			# Many arch-specific implementations do not work on ppc with
+			# cache-block not equal to 128 bytes. This breaks memset:
+			#   https://sourceware.org/PR26522
+			#   https://bugs.gentoo.org/737996
+			# Use default -mcpu=. For ppc it means non-multiarch setup.
+			filter-flags '-mcpu=*'
+		;;
+		sparc)
+			# Both sparc and sparc64 can use -fcall-used-g6.  -g7 is bad, though.
+			filter-flags "-fcall-used-g7"
+			append-flags "-fcall-used-g6"
+
+			local cpu
+			case ${CTARGET} in
+			sparc64-*)
+				cpu="sparc64"
+				case $(get-flag mcpu) in
+				v9)
+					# We need to force at least v9a because the base build doesn't
+					# work with just v9.
+					# https://sourceware.org/bugzilla/show_bug.cgi?id=19477
+					append-flags "-Wa,-xarch=v9a"
+					;;
+				esac
+				;;
+			sparc-*)
+				case $(get-flag mcpu) in
+				v8|supersparc|hypersparc|leon|leon3)
+					cpu="sparcv8"
+					;;
+				*)
+					cpu="sparcv9"
+					;;
+				esac
+			;;
+			esac
+			[[ -n ${cpu} ]] && CTARGET_OPT="${cpu}-${CTARGET#*-}"
+		;;
+	esac
+}
+
+setup_flags() {
+	# Make sure host make.conf doesn't pollute us
+	if is_crosscompile || tc-is-cross-compiler ; then
+		CHOST=${CTARGET} strip-unsupported-flags
+	fi
+
+	# Store our CFLAGS because it's changed depending on which CTARGET
+	# we are building when pulling glibc on a multilib profile
+	CFLAGS_BASE=${CFLAGS_BASE-${CFLAGS}}
+	CFLAGS=${CFLAGS_BASE}
+	CXXFLAGS_BASE=${CXXFLAGS_BASE-${CXXFLAGS}}
+	CXXFLAGS=${CXXFLAGS_BASE}
+	ASFLAGS_BASE=${ASFLAGS_BASE-${ASFLAGS}}
+	ASFLAGS=${ASFLAGS_BASE}
+
+	# Allow users to explicitly avoid flag sanitization via
+	# USE=custom-cflags.
+	if ! use custom-cflags; then
+		# Over-zealous CFLAGS can often cause problems.  What may work for one
+		# person may not work for another.  To avoid a large influx of bugs
+		# relating to failed builds, we strip most CFLAGS out to ensure as few
+		# problems as possible.
+		strip-flags
+		# Lock glibc at -O2; we want to be conservative here.
+		filter-flags '-O?'
+		append-flags -O2
+	fi
+
+	strip-unsupported-flags
+	filter-lto
+	filter-flags -m32 -m64 '-mabi=*'
+
+	# glibc aborts if rpath is set by LDFLAGS
+	filter-ldflags '-Wl,-rpath=*'
+
+	# ld can't use -r & --relax at the same time, bug #788901
+	# https://sourceware.org/PR27837
+	filter-ldflags '-Wl,--relax'
+
+	# Flag added for cross-prefix, but causes ldconfig to segfault. Not needed
+	# anyway because glibc already handles this by itself.
+	filter-ldflags '-Wl,--dynamic-linker=*'
+
+	# some weird software relies on sysv hashes in glibc, bug 863863, bug 864100
+	# we have to do that here already so mips can filter it out again :P
+	if use hash-sysv-compat ; then
+		append-ldflags '-Wl,--hash-style=both'
+	fi
+
+	# #492892
+	filter-flags -frecord-gcc-switches
+
+	# #898098
+	filter-flags -fno-builtin
+
+	# #829583
+	filter-lfs-flags
+
+	unset CBUILD_OPT CTARGET_OPT
+	if use multilib ; then
+		CTARGET_OPT=$(get_abi_CTARGET)
+		[[ -z ${CTARGET_OPT} ]] && CTARGET_OPT=$(get_abi_CHOST)
+	fi
+
+	setup_target_flags
+
+	if [[ -n ${CTARGET_OPT} && ${CBUILD} == ${CHOST} ]] && ! is_crosscompile; then
+		CBUILD_OPT=${CTARGET_OPT}
+	fi
+
+	# glibc's headers disallow -O0 and fail at build time:
+	#  include/libc-symbols.h:75:3: #error "glibc cannot be compiled without optimization"
+	# https://sourceware.org/glibc/wiki/FAQ#Why_do_I_get:.60.23error_.22glibc_cannot_be_compiled_without_optimization.22.27.2C_when_trying_to_compile_GNU_libc_with_GNU_CC.3F
+	replace-flags -O0 -O1
+
+	# glibc handles this internally already where it's appropriate;
+	# can't always have SSP when we're the ones setting it up, etc
+	filter-flags '-fstack-protector*'
+
+	# Similar issues as with SSP. Can't inject yourself that early.
+	filter-flags '-fsanitize=*'
+
+	# See end of bug #830454; we handle this via USE=cet
+	filter-flags '-fcf-protection=*'
+
+	# When bootstrapping, we may have a situation where
+	# CET-enabled gcc from seed is used to build CET-disabled
+	# glibc. As such, gcc implicitly enables CET if no
+	# -fcf-protection flag is passed. For a typical package it
+	# should not be a problem, but for glibc it matters as it is
+	# dealing with CET in ld.so. So if CET is supposed to be
+	# disabled for glibc, be explicit about it.
+	if ! use cet; then
+		if use amd64 || use x86; then
+			append-flags '-fcf-protection=none'
+		elif use arm64; then
+			append-flags '-mbranch-protection=none'
+		fi
+	fi
+}
+
+use_multiarch() {
+	# Allow user to disable runtime arch detection in multilib.
+	use multiarch || return 1
+	# Make sure binutils is new enough to support indirect functions,
+	# #336792. This funky sed supports gold and bfd linkers.
+	local bver nver
+	bver=$($(tc-getLD ${CTARGET}) -v | sed -n -r '1{s:[^0-9]*::;s:^([0-9.]*).*:\1:;p}')
+	case $(tc-arch ${CTARGET}) in
+	amd64|x86) nver="2.20" ;;
+	arm)       nver="2.22" ;;
+	hppa)      nver="2.23" ;;
+	ppc|ppc64) nver="2.20" ;;
+	# ifunc support was added in 2.23, but glibc also needs
+	# machinemode which is in 2.24.
+	s390)      nver="2.24" ;;
+	sparc)     nver="2.21" ;;
+	*)         return 1 ;;
+	esac
+	ver_test ${bver} -ge ${nver}
+}
+
+# Setup toolchain variables that had historically been defined in the
+# profiles for these archs.
+setup_env() {
+	# silly users
+	unset LD_RUN_PATH
+	unset LD_ASSUME_KERNEL
+
+	if is_crosscompile || tc-is-cross-compiler ; then
+		multilib_env ${CTARGET_OPT:-${CTARGET}}
+
+		if ! use multilib ; then
+			MULTILIB_ABIS=${DEFAULT_ABI}
+		else
+			MULTILIB_ABIS=${MULTILIB_ABIS:-${DEFAULT_ABI}}
+		fi
+
+		# If the user has CFLAGS_<CTARGET> in their make.conf, use that,
+		# and fall back on CFLAGS.
+		local VAR=CFLAGS_${CTARGET//[-.]/_}
+		CFLAGS=${!VAR-${CFLAGS}}
+		einfo " $(printf '%15s' 'Manual CFLAGS:')   ${CFLAGS}"
+	fi
+
+	setup_flags
+
+	export ABI=${ABI:-${DEFAULT_ABI:-default}}
+
+	if just_headers ; then
+		# Avoid mixing host's CC and target's CFLAGS_${ABI}:
+		# At this bootstrap stage we have only binutils for
+		# target but not compiler yet.
+		einfo "Skip CC ABI injection. We can't use (cross-)compiler yet."
+		return 0
+	fi
+
+	# Glibc does not work with gold (for various reasons) #269274.
+	tc-ld-disable-gold
+
+	if use doc ; then
+		export MAKEINFO=makeinfo
+	else
+		export MAKEINFO=/dev/null
+	fi
+
+	# Reset CC and CXX to the value at start of emerge
+	export CC=${glibc__ORIG_CC:-${CC:-$(tc-getCC ${CTARGET})}}
+	export CXX=${glibc__ORIG_CXX:-${CXX:-$(tc-getCXX ${CTARGET})}}
+	export CPP=${glibc__ORIG_CPP:-${CPP:-$(tc-getCPP ${CTARGET})}}
+
+	# and make sure glibc__ORIG_CC and glibc__ORIG_CXX is defined now.
+	export glibc__ORIG_CC=${CC}
+	export glibc__ORIG_CXX=${CXX}
+	export glibc__ORIG_CPP=${CPP}
+
+	if tc-is-clang && ! use custom-cflags && ! is_crosscompile ; then
+		export glibc__force_gcc=yes
+		# once this is toggled on, it needs to stay on, since with CPP manipulated
+		# tc-is-clang does not work correctly anymore...
+	fi
+
+	if [[ ${glibc__force_gcc} == "yes" ]] ; then
+		# If we are running in an otherwise clang/llvm environment, we need to
+		# recover the proper gcc and binutils settings here, at least until glibc
+		# is finally building with clang. So let's override everything that is
+		# set in the clang profiles.
+		# Want to shoot yourself into the foot? Set USE=custom-cflags, that's always
+		# a good start into that direction.
+		# Also, if you're crosscompiling, let's assume you know what you are doing.
+		# Hopefully.
+		# Last, we need the settings of the *build* environment, not of the
+		# target environment...
+
+		local current_binutils_path=$(env ROOT="${BROOT}" binutils-config -B)
+		local current_gcc_path=$(env ROOT="${BROOT}" gcc-config -B)
+		einfo "Overriding clang configuration, since it won't work here"
+
+		export CC="${current_gcc_path}/gcc"
+		export CPP="${current_gcc_path}/cpp"
+		export CXX="${current_gcc_path}/g++"
+		export LD="${current_binutils_path}/ld.bfd"
+		export AR="${current_binutils_path}/ar"
+		export AS="${current_binutils_path}/as"
+		export NM="${current_binutils_path}/nm"
+		export STRIP="${current_binutils_path}/strip"
+		export RANLIB="${current_binutils_path}/ranlib"
+		export OBJCOPY="${current_binutils_path}/objcopy"
+		export STRINGS="${current_binutils_path}/strings"
+		export OBJDUMP="${current_binutils_path}/objdump"
+		export READELF="${current_binutils_path}/readelf"
+		export ADDR2LINE="${current_binutils_path}/addr2line"
+
+		# do we need to also do flags munging here? yes! at least...
+		filter-flags '-fuse-ld=*'
+		filter-flags '-D_FORTIFY_SOURCE=*'
+
+	else
+
+		# this is the "normal" case
+
+		export CC="$(tc-getCC ${CTARGET})"
+		export CXX="$(tc-getCXX ${CTARGET})"
+		export CPP="$(tc-getCPP ${CTARGET})"
+
+		# Always use tuple-prefixed toolchain. For non-native ABI glibc's configure
+		# can't detect them automatically due to ${CHOST} mismatch and fallbacks
+		# to unprefixed tools. Similar to multilib.eclass:multilib_toolchain_setup().
+		export NM="$(tc-getNM ${CTARGET})"
+		export READELF="$(tc-getREADELF ${CTARGET})"
+
+	fi
+
+	# We need to export CFLAGS with abi information in them because glibc's
+	# configure script checks CFLAGS for some targets (like mips).  Keep
+	# around the original clean value to avoid appending multiple ABIs on
+	# top of each other. (Why does the comment talk about CFLAGS if the code
+	# acts on CC?)
+	export glibc__GLIBC_CC=${CC}
+	export glibc__GLIBC_CXX=${CXX}
+	export glibc__GLIBC_CPP=${CPP}
+
+	export glibc__abi_CFLAGS="$(get_abi_CFLAGS)"
+
+	# CFLAGS can contain ABI-specific flags like -mfpu=neon, see bug #657760
+	# To build .S (assembly) files with the same ABI-specific flags
+	# upstream currently recommends adding CFLAGS to CC/CXX:
+	#    https://sourceware.org/PR23273
+	# Note: Passing CFLAGS via CPPFLAGS overrides glibc's arch-specific CFLAGS
+	# and breaks multiarch support. See 659030#c3 for an example.
+	# The glibc configure script doesn't properly use LDFLAGS all the time.
+	export CC="${glibc__GLIBC_CC} ${glibc__abi_CFLAGS} ${CFLAGS} ${LDFLAGS}"
+
+	# Some of the tests are written in C++, so we need to force our multlib abis in, bug 623548
+	export CXX="${glibc__GLIBC_CXX} ${glibc__abi_CFLAGS} ${CFLAGS}"
+
+	export CPP="${glibc__GLIBC_CPP} ${glibc__abi_CFLAGS} ${CFLAGS}"
+
+	if is_crosscompile; then
+		# Assume worst-case bootstrap: glibc is built for the first time
+		# with ${CTARGET}-g++ not available yet. We avoid
+		# building auxiliary programs that require C++: bug #683074
+		# It should not affect final result.
+		export libc_cv_cxx_link_ok=no
+		# The line above has the same effect. We set CXX explicitly
+		# to make build logs less confusing.
+		export CXX=
+	fi
+}
+
+foreach_abi() {
+	setup_env
+
+	local ret=0
+	local abilist=""
+	if use multilib ; then
+		abilist=$(get_install_abis)
+	else
+		abilist=${DEFAULT_ABI}
+	fi
+	local -x ABI
+	for ABI in ${abilist:-default} ; do
+		setup_env
+		einfo "Running $1 for ABI ${ABI}"
+		$1
+		: $(( ret |= $? ))
+	done
+	return ${ret}
+}
+
+glibc_banner() {
+	local b="Gentoo ${PVR}"
+	[[ -n ${PATCH_VER} ]] && ! use vanilla && b+=" (patchset ${PATCH_VER})"
+	echo "${b}"
+}
+
+# The following Kernel version handling functions are mostly copied from portage
+# source. It's better not to use linux-info.eclass here since a) it adds too
+# much magic, see bug 326693 for some of the arguments, and b) some of the
+# functions are just not provided.
+
+g_get_running_KV() {
+	uname -r
+	return $?
+}
+
+g_KV_major() {
+	[[ -z $1 ]] && return 1
+	local KV=$@
+	echo "${KV%%.*}"
+}
+
+g_KV_minor() {
+	[[ -z $1 ]] && return 1
+	local KV=$@
+	KV=${KV#*.}
+	echo "${KV%%.*}"
+}
+
+g_KV_micro() {
+	[[ -z $1 ]] && return 1
+	local KV=$@
+	KV=${KV#*.*.}
+	echo "${KV%%[^[:digit:]]*}"
+}
+
+g_KV_to_int() {
+	[[ -z $1 ]] && return 1
+	local KV_MAJOR=$(g_KV_major "$1")
+	local KV_MINOR=$(g_KV_minor "$1")
+	local KV_MICRO=$(g_KV_micro "$1")
+	local KV_int=$(( KV_MAJOR * 65536 + KV_MINOR * 256 + KV_MICRO ))
+
+	# We make version 2.2.0 the minimum version we will handle as
+	# a sanity check ... if its less, we fail ...
+	if [[ ${KV_int} -ge 131584 ]] ; then
+		echo "${KV_int}"
+		return 0
+	fi
+	return 1
+}
+
+g_int_to_KV() {
+	local version=$1 major minor micro
+	major=$((version / 65536))
+	minor=$(((version % 65536) / 256))
+	micro=$((version % 256))
+	echo ${major}.${minor}.${micro}
+}
+
+eend_KV() {
+	[[ $(g_KV_to_int $1) -ge $(g_KV_to_int $2) ]]
+	eend $?
+}
+
+get_kheader_version() {
+	printf '#include <linux/version.h>\nLINUX_VERSION_CODE\n' | \
+	$(tc-getCPP ${CTARGET}) -I "$(build_eprefix)$(alt_build_headers)" - | \
+	tail -n 1
+}
+
+# We collect all sanity checks here. Consistency is not guranteed between
+# pkg_ and src_ phases, so we call this function both in pkg_pretend and in
+# src_unpack.
+sanity_prechecks() {
+	# Prevent native builds from downgrading
+	if [[ ${MERGE_TYPE} != "buildonly" ]] && \
+	   [[ -z ${ROOT} ]] && \
+	   [[ ${CBUILD} == ${CHOST} ]] && \
+	   [[ ${CHOST} == ${CTARGET} ]] ; then
+
+		# The high rev # is to allow people to downgrade between -r#
+		# versions. We want to block 2.20->2.19, but 2.20-r3->2.20-r2
+		# should be fine. Hopefully we never actually use a r# this
+		# high.
+		if has_version ">${CATEGORY}/${P}-r10000" ; then
+			eerror "Sanity check to keep you from breaking your system:"
+			eerror " Downgrading glibc is not supported and a sure way to destruction."
+			[[ ${I_ALLOW_TO_BREAK_MY_SYSTEM} = yes ]] || die "Aborting to save your system."
+		fi
+
+		if ! do_run_test '#include <unistd.h>\n#include <sys/syscall.h>\nint main(){return syscall(1000)!=-1;}\n' ; then
+			eerror "Your old kernel is broken. You need to update it to a newer"
+			eerror "version as syscall(<bignum>) will break. See bug 279260."
+			die "Old and broken kernel."
+		fi
+	fi
+
+	if [[ ${CTARGET} == i386-* ]] ; then
+		eerror "i386 CHOSTs are no longer supported."
+		eerror "Chances are you don't actually want/need i386."
+		eerror "Please read https://www.gentoo.org/doc/en/change-chost.xml"
+		die "Please fix your CHOST"
+	fi
+
+	if [[ -e /proc/xen ]] && [[ $(tc-arch) == "x86" ]] && ! is-flag -mno-tls-direct-seg-refs ; then
+		ewarn "You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS."
+		ewarn "This will result in a 50% performance penalty when running with a 32bit"
+		ewarn "hypervisor, which is probably not what you want."
+	fi
+
+	# ABI-specific checks follow here. Hey, we have a lot more specific conditions that
+	# we test for...
+	if ! is_crosscompile ; then
+		if use amd64 && use multilib && [[ ${MERGE_TYPE} != "binary" ]] ; then
+			ebegin "Checking that IA32 emulation is enabled in the running kernel"
+			echo 'int main(){return 0;}' > "${T}/check-ia32-emulation.c"
+			local STAT
+			if ${CC-${CHOST}-gcc} ${CFLAGS_x86} "${T}/check-ia32-emulation.c" -o "${T}/check-ia32-emulation.elf32"; then
+				"${T}/check-ia32-emulation.elf32"
+				STAT=$?
+			else
+				# Don't fail here to allow single->multi ABI switch
+				# or recover from breakage like bug #646424
+				ewarn "Failed to compile the ABI test. Broken host glibc?"
+				STAT=0
+			fi
+			rm -f "${T}/check-ia32-emulation.elf32"
+			eend $STAT
+			[[ $STAT -eq 0 ]] || die "CONFIG_IA32_EMULATION must be enabled in the kernel to compile a multilib glibc."
+		fi
+
+	fi
+
+	# When we actually have to compile something...
+	if ! just_headers && [[ ${MERGE_TYPE} != "binary" ]] ; then
+		if [[ -d "${ESYSROOT}"/usr/lib/include ]] ; then
+			# bug #833620, bug #643302
+			eerror "Found ${ESYSROOT}/usr/lib/include directory!"
+			eerror "This is known to break glibc's build."
+			eerror "Please backup its contents then remove the directory."
+			die "Found directory (${ESYSROOT}/usr/lib/include) which will break build (bug #833620)!"
+		fi
+
+		if [[ ${CTARGET} == *-linux* ]] ; then
+			local run_kv build_kv want_kv
+
+			run_kv=$(g_get_running_KV)
+			build_kv=$(g_int_to_KV $(get_kheader_version))
+			want_kv=${MIN_KERN_VER}
+
+			if ! is_crosscompile && ! tc-is-cross-compiler ; then
+				# Building fails on an non-supporting kernel
+				ebegin "Checking running kernel version (${run_kv} >= ${want_kv})"
+				if ! eend_KV ${run_kv} ${want_kv} ; then
+					echo
+					eerror "You need a kernel of at least ${want_kv}!"
+					die "Kernel version too low!"
+				fi
+			fi
+
+			# Do not run this check for pkg_pretend, just pkg_setup and friends (if we ever get used there).
+			# It's plausible (seen it in the wild) that Portage will (correctly) schedule a linux-headers
+			# upgrade before glibc, but because pkg_pretend gets run before any packages are merged at all (not
+			# just glibc), the whole emerge gets aborted without a good reason. We probably don't
+			# need to run this check at all given we have a dependency on the right headers,
+			# but let's leave it as-is for now.
+			if [[ ${EBUILD_PHASE_FUNC} != pkg_pretend ]] ; then
+				ebegin "Checking linux-headers version (${build_kv} >= ${want_kv})"
+				if ! eend_KV ${build_kv} ${want_kv} ; then
+					echo
+					eerror "You need linux-headers of at least ${want_kv}!"
+					die "linux-headers version too low!"
+				fi
+			fi
+		fi
+	fi
+}
+
+upgrade_warning() {
+	is_crosscompile && return
+
+	if [[ ${MERGE_TYPE} != buildonly && -n ${REPLACING_VERSIONS} && -z ${ROOT} ]]; then
+		local oldv newv=$(ver_cut 1-2 ${PV})
+		for oldv in ${REPLACING_VERSIONS}; do
+			if ver_test ${oldv} -lt ${newv}; then
+				ewarn "After upgrading glibc, please restart all running processes."
+				ewarn "Be sure to include init (telinit u) or systemd (systemctl daemon-reexec)."
+				ewarn "Alternatively, reboot your system."
+				ewarn "(See bug #660556, bug #741116, bug #823756, etc)"
+				break
+			fi
+		done
+	fi
+}
+
+#
+# the phases
+#
+
+# pkg_pretend
+
+pkg_pretend() {
+	upgrade_warning
+}
+
+# pkg_setup
+
+pkg_setup() {
+	# see bug 682570
+	[[ -z ${BOOTSTRAP_RAP} ]] && python-any-r1_pkg_setup
+}
+
+# src_unpack
+
+src_unpack() {
+	setup_env
+
+	einfo "Checking general environment sanity."
+	sanity_prechecks
+
+	use multilib-bootstrap && unpack gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz
+
+	if [[ ${PV} == 9999* ]] ; then
+		EGIT_REPO_URI="https://anongit.gentoo.org/git/proj/toolchain/glibc-patches.git"
+		EGIT_CHECKOUT_DIR=${WORKDIR}/patches-git
+		git-r3_src_unpack
+		mv patches-git/9999 patches || die
+
+		EGIT_REPO_URI="https://sourceware.org/git/glibc.git"
+		EGIT_CHECKOUT_DIR=${S}
+		git-r3_src_unpack
+	else
+		unpack ${P}.tar.xz
+
+		cd "${WORKDIR}" || die
+		unpack glibc-${PV}-patches-${PATCH_VER}.tar.xz
+	fi
+
+	cd "${WORKDIR}" || die
+	use systemd && unpack glibc-systemd-${GLIBC_SYSTEMD_VER}.tar.gz
+}
+
+# src_prepare
+
+src_prepare() {
+	local patchsetname
+	if ! use vanilla ; then
+		if [[ ${PV} == 9999* ]] ; then
+			patchsetname="from git master"
+		else
+			patchsetname="${PV}-${PATCH_VER}"
+		fi
+		einfo "Applying Gentoo Glibc patchset ${patchsetname}"
+		eapply "${WORKDIR}"/patches
+		einfo "Done."
+	fi
+
+	default
+
+	gnuconfig_update
+
+	cd "${WORKDIR}" || die
+	find . -name configure -exec touch {} +
+
+	# Fix permissions on some of the scripts.
+	chmod u+x "${S}"/scripts/*.sh
+
+	cd "${S}" || die
+}
+
+# src_configure
+
+glibc_do_configure() {
+	dump_build_environment
+
+	local myconf=()
+
+	# Use '=strong' instead of '=all' to protect only functions
+	# worth protecting from stack smashes.
+	myconf+=( --enable-stack-protector=$(usex ssp strong no) )
+
+	# Keep a whitelist of targets supporing IFUNC. glibc's ./configure
+	# is not robust enough to detect proper support:
+	#    https://bugs.gentoo.org/641216
+	#    https://sourceware.org/PR22634#c0
+	case $(tc-arch ${CTARGET}) in
+		# Keep whitelist of targets where autodetection mostly works.
+		amd64|x86|sparc|ppc|ppc64|arm|arm64|s390|riscv|loong) ;;
+		# Blacklist everywhere else
+		*) myconf+=( libc_cv_ld_gnu_indirect_function=no ) ;;
+	esac
+
+	case ${ABI}-${CTARGET} in
+		amd64-x86_64-*|x32-x86_64-*-*-gnux32) myconf+=( $(use_enable cet) ) ;;
+		*) ;;
+	esac
+
+	[[ $(tc-is-softfloat) == "yes" ]] && myconf+=( --without-fp )
+
+	myconf+=( --enable-kernel=${MIN_KERN_VER} )
+
+	# Since SELinux support is only required for nscd, only enable it if:
+	# 1. USE selinux
+	# 2. only for the primary ABI on multilib systems
+	# 3. Not a crosscompile
+	if ! is_crosscompile && use selinux ; then
+		if use multilib ; then
+			if is_final_abi ; then
+				myconf+=( --with-selinux )
+			else
+				myconf+=( --without-selinux )
+			fi
+		else
+			myconf+=( --with-selinux )
+		fi
+	else
+		myconf+=( --without-selinux )
+	fi
+
+	# Force a few tests where we always know the answer but
+	# configure is incapable of finding it.
+	if is_crosscompile ; then
+		export \
+			libc_cv_c_cleanup=yes \
+			libc_cv_forced_unwind=yes
+	fi
+
+	myconf+=(
+		--disable-werror
+		--enable-bind-now
+		--enable-fortify-source
+		--build=${CBUILD_OPT:-${CBUILD}}
+		--host=${CTARGET_OPT:-${CTARGET}}
+		$(use_enable profile)
+		$(use_with gd)
+		--with-headers=$(build_eprefix)$(alt_build_headers)
+		--prefix="$(host_eprefix)/usr"
+		--sysconfdir="$(host_eprefix)/etc"
+		--localstatedir="$(host_eprefix)/var"
+		--libdir='$(prefix)'/$(get_libdir)
+		--mandir='$(prefix)'/share/man
+		--infodir='$(prefix)'/share/info
+		--libexecdir='$(libdir)'/misc/glibc
+		--with-bugurl=https://bugs.gentoo.org/
+		--with-pkgversion="$(glibc_banner)"
+		$(use_multiarch || echo --disable-multi-arch)
+		$(use_enable systemtap)
+		$(use_enable nscd)
+
+		# /usr/bin/mtrace has a Perl shebang. Gentoo Prefix QA checks fail if
+		# Perl hasn't been installed inside the prefix yet and configure picks
+		# up a Perl from outside the prefix instead. configure will fail to
+		# execute Perl during configure if we're cross-compiling a prefix, but
+		# it will just disable mtrace in that case.
+		# Note: mtrace is needed by the test suite.
+		ac_cv_path_PERL="$(usex perl "${EPREFIX}"/usr/bin/perl $(usex test "${EPREFIX}"/usr/bin/perl $(usex doc "${EPREFIX}"/usr/bin/perl no)))"
+
+		# locale data is arch-independent
+		# https://bugs.gentoo.org/753740
+		libc_cv_complocaledir='${exec_prefix}/lib/locale'
+
+		# On aarch64 there is no way to override -mcpu=native, and if
+		# the current cpu does not support SVE configure fails.
+		# Let's boldly assume our toolchain can always build SVE instructions.
+		libc_cv_aarch64_sve_asm=yes
+
+		${EXTRA_ECONF}
+	)
+
+	# We rely on sys-libs/timezone-data for timezone tools normally.
+	myconf+=( $(use_enable vanilla timezone-tools) )
+
+	# These libs don't have configure flags.
+	ac_cv_lib_audit_audit_log_user_avc_message=$(usex audit || echo no)
+	ac_cv_lib_cap_cap_init=$(usex caps || echo no)
+
+	# There is no configure option for this and we need to export it
+	# since the glibc build will re-run configure on itself
+	export libc_cv_rootsbindir="$(host_eprefix)/sbin"
+	export libc_cv_slibdir="$(host_eprefix)/$(get_libdir)"
+
+	local builddir=$(builddir nptl)
+	mkdir -p "${builddir}"
+	cd "${builddir}"
+	set -- "${S}"/configure "${myconf[@]}"
+	echo "$@"
+	"$@" || die "failed to configure glibc"
+
+	# If we're trying to migrate between ABI sets, we need
+	# to lie and use a local copy of gcc.  Like if the system
+	# is built with MULTILIB_ABIS="amd64 x86" but we want to
+	# add x32 to it, gcc/glibc don't yet support x32.
+	#
+	if [[ -n ${GCC_BOOTSTRAP_VER} ]] && use multilib-bootstrap ; then
+		echo 'int main(void){}' > "${T}"/test.c || die
+		if ! $(tc-getCC ${CTARGET}) ${CFLAGS} ${LDFLAGS} "${T}"/test.c -Wl,-emain -lgcc 2>/dev/null ; then
+			sed -i -e '/^CC = /s:$: -B$(objdir)/../'"gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}/${ABI}:" config.make || die
+		fi
+	fi
+}
+
+glibc_headers_configure() {
+	export ABI=default
+
+	local builddir=$(builddir "headers")
+	mkdir -p "${builddir}"
+	cd "${builddir}"
+
+	# if we don't have a compiler yet, we can't really test it now ...
+	# hopefully they don't affect header generation, so let's hope for
+	# the best here ...
+	local v vars=(
+		ac_cv_header_cpuid_h=yes
+		libc_cv_{386,390,alpha,arm,hppa,mips,{powerpc,sparc}{,32,64},sh,x86_64}_tls=yes
+		libc_cv_asm_cfi_directives=yes
+		libc_cv_broken_visibility_attribute=no
+		libc_cv_c_cleanup=yes
+		libc_cv_compiler_powerpc64le_binary128_ok=yes
+		libc_cv_forced_unwind=yes
+		libc_cv_gcc___thread=yes
+		libc_cv_mlong_double_128=yes
+		libc_cv_mlong_double_128ibm=yes
+		libc_cv_ppc_machine=yes
+		libc_cv_ppc_rel16=yes
+		libc_cv_predef_fortify_source=no
+		libc_cv_target_power8_ok=yes
+		libc_cv_visibility_attribute=yes
+		libc_cv_z_combreloc=yes
+		libc_cv_z_execstack=yes
+		libc_cv_z_initfirst=yes
+		libc_cv_z_nodelete=yes
+		libc_cv_z_nodlopen=yes
+		libc_cv_z_relro=yes
+		libc_mips_abi=${ABI}
+		libc_mips_float=$([[ $(tc-is-softfloat) == "yes" ]] && echo soft || echo hard)
+		# These libs don't have configure flags.
+		ac_cv_lib_audit_audit_log_user_avc_message=no
+		ac_cv_lib_cap_cap_init=no
+	)
+
+	einfo "Forcing cached settings:"
+	for v in "${vars[@]}" ; do
+		einfo " ${v}"
+		export ${v}
+	done
+
+	local headers_only_arch_CPPFLAGS=()
+
+	# Blow away some random CC settings that screw things up. #550192
+	if [[ -d ${S}/sysdeps/mips ]]; then
+		pushd "${S}"/sysdeps/mips >/dev/null
+		sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=32:' mips32/Makefile mips64/n32/Makefile || die
+		sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=64:' mips64/n64/Makefile || die
+
+		# Force the mips ABI to the default.  This is OK because the set of
+		# installed headers in this phase is the same between the 3 ABIs.
+		# If this ever changes, this hack will break, but that's unlikely
+		# as glibc discourages that behavior.
+		# https://crbug.com/647033
+		sed -i -e 's:abiflag=.*:abiflag=_ABIO32:' preconfigure || die
+
+		popd >/dev/null
+	fi
+
+	local myconf=()
+
+	case ${CTARGET} in
+	aarch64*)
+		# The configure checks fail during cross-build, so disable here
+		# for headers-only
+		myconf+=(
+			--disable-mathvec
+		) ;;
+	riscv*)
+		# RISC-V interrogates the compiler to determine which target to
+		# build.  If building the headers then we don't strictly need a
+		# RISC-V compiler, so the built-in definitions that are provided
+		# along with all RISC-V compiler might not exist.  This causes
+		# glibc's RISC-V preconfigure script to blow up.  Since we're just
+		# building the headers any value will actually work here, so just
+		# pick the standard one (rv64g/lp64d) to make the build scripts
+		# happy for now -- the headers are all the same anyway so it
+		# doesn't matter.
+		headers_only_arch_CPPFLAGS+=(
+			-D__riscv_xlen=64
+			-D__riscv_flen=64
+			-D__riscv_float_abi_double=1
+			-D__riscv_atomic=1
+		) ;;
+	esac
+
+	myconf+=(
+		--disable-sanity-checks
+		--enable-hacker-mode
+		--disable-werror
+		--enable-bind-now
+		--build=${CBUILD_OPT:-${CBUILD}}
+		--host=${CTARGET_OPT:-${CTARGET}}
+		--with-headers=$(build_eprefix)$(alt_build_headers)
+		--prefix="$(host_eprefix)/usr"
+		${EXTRA_ECONF}
+	)
+
+	# Nothing is compiled here which would affect the headers for the target.
+	# So forcing CC/CFLAGS is sane.
+	local headers_only_CC=$(tc-getBUILD_CC)
+	local headers_only_CFLAGS="-O1 -pipe"
+	local headers_only_CPPFLAGS="-U_FORTIFY_SOURCE ${headers_only_arch_CPPFLAGS[*]}"
+	local headers_only_LDFLAGS=""
+	set -- "${S}"/configure "${myconf[@]}"
+	echo \
+		"CC=${headers_only_CC}" \
+		"CFLAGS=${headers_only_CFLAGS}" \
+		"CPPFLAGS=${headers_only_CPPFLAGS}" \
+		"LDFLAGS=${headers_only_LDFLAGS}" \
+		"$@"
+	CC=${headers_only_CC} \
+	CFLAGS=${headers_only_CFLAGS} \
+	CPPFLAGS=${headers_only_CPPFLAGS} \
+	LDFLAGS="" \
+	"$@" || die "failed to configure glibc"
+}
+
+do_src_configure() {
+	if just_headers ; then
+		glibc_headers_configure
+	else
+		glibc_do_configure nptl
+	fi
+}
+
+src_configure() {
+	foreach_abi do_src_configure
+}
+
+# src_compile
+
+do_src_compile() {
+	emake -C "$(builddir nptl)"
+}
+
+src_compile() {
+	if just_headers ; then
+		return
+	fi
+
+	foreach_abi do_src_compile
+}
+
+# src_test
+
+glibc_src_test() {
+	cd "$(builddir nptl)"
+
+	local myxfailparams=""
+	if [[ "${GENTOO_GLIBC_XFAIL_TESTS}" == "yes" ]] ; then
+		local virt=$(systemd-detect-virt 2>/dev/null)
+		if [[ ${virt} == systemd-nspawn ]] ; then
+			ewarn "Skipping extra tests because in systemd-nspawn container"
+			XFAIL_TEST_LIST+=( "${XFAIL_NSPAWN_TEST_LIST[@]}" )
+		fi
+
+		for myt in ${XFAIL_TEST_LIST[@]} ; do
+			myxfailparams+="test-xfail-${myt}=yes "
+		done
+	fi
+
+	# sandbox does not understand unshare() and prevents
+	# writes to /proc/, which makes many tests fail
+
+	# we give the tests a bit more time to avoid spurious
+	# bug reports on slow arches
+
+	SANDBOX_ON=0 LD_PRELOAD= TIMEOUTFACTOR=16 emake ${myxfailparams} check
+}
+
+src_test() {
+	if just_headers ; then
+		return
+	fi
+
+	foreach_abi glibc_src_test || die "tests failed"
+}
+
+# src_install
+
+run_locale_gen() {
+	# if the host locales.gen contains no entries, we'll install everything
+	local root="$1"
+	local inplace=""
+
+	if [[ "${root}" == "--inplace-glibc" ]] ; then
+		inplace="--inplace-glibc"
+		root="$2"
+	fi
+
+	local locale_list="${root%/}/etc/locale.gen"
+
+	pushd "${ED}"/$(get_libdir) >/dev/null
+
+	if [[ -z $(locale-gen --list --config "${locale_list}") ]] ; then
+		[[ -z ${inplace} ]] && ewarn "Generating all locales; edit /etc/locale.gen to save time/space"
+		locale_list="${root%/}/usr/share/i18n/SUPPORTED"
+	fi
+
+	# bug 736794: we need to be careful with the parallelization... the number of
+	# processors saved in the environment of a binary package may differ strongly
+	# from the number of processes available during postinst
+	local mygenjobs="$(makeopts_jobs)"
+	if [[ "${EMERGE_FROM}" == "binary" ]] ; then
+		mygenjobs="$(nproc)"
+	fi
+
+	set -- locale-gen ${inplace} --jobs "${mygenjobs}" --config "${locale_list}" \
+		--destdir "${root}"
+	echo "$@"
+	"$@"
+
+	popd >/dev/null
+}
+
+glibc_do_src_install() {
+	local builddir=$(builddir nptl)
+	cd "${builddir}"
+
+	emake install_root="${D}/$(build_eprefix)$(alt_prefix)" install
+
+	# This version (2.26) provides some compatibility libraries for the NIS/NIS+ support
+	# which come without headers etc. Only needed for binary packages since the
+	# external net-libs/libnsl has increased soversion. Keep only versioned libraries.
+	find "${D}" -name "libnsl.a" -delete
+	find "${D}" -name "libnsl.so" -delete
+
+	# Normally upstream_pv is ${PV}. Live ebuilds are exception, there we need
+	# to infer upstream version:
+	# '#define VERSION "2.26.90"' -> '2.26.90'
+	local upstream_pv=$(sed -n -r 's/#define VERSION "(.*)"/\1/p' "${S}"/version.h)
+
+	# Avoid stripping binaries not targeted by ${CHOST}. Or else
+	# ${CHOST}-strip would break binaries build for ${CTARGET}.
+	is_crosscompile && dostrip -x /
+
+	# gdb thread introspection relies on local libpthreads symbols. stripping breaks it
+	# See Note [Disable automatic stripping]
+	dostrip -x $(alt_libdir)/libpthread-${upstream_pv}.so
+	# valgrind requires knowledge about ld.so symbols.
+	dostrip -x $(alt_libdir)/ld-*.so*
+
+	if [[ -e ${ED}/$(alt_usrlibdir)/libm-${upstream_pv}.a ]] ; then
+		# Move versioned .a file out of libdir to evade portage QA checks
+		# instead of using gen_usr_ldscript(). We fix ldscript as:
+		# "GROUP ( /usr/lib64/libm-<pv>.a ..." -> "GROUP ( /usr/lib64/glibc-<pv>/libm-<pv>.a ..."
+		sed -i "s@\(libm-${upstream_pv}.a\)@${P}/\1@" \
+			"${ED}"/$(alt_usrlibdir)/libm.a || die
+		dodir $(alt_usrlibdir)/${P}
+		mv "${ED}"/$(alt_usrlibdir)/libm-${upstream_pv}.a \
+			"${ED}"/$(alt_usrlibdir)/${P}/libm-${upstream_pv}.a || die
+	fi
+
+	# We configure toolchains for standalone prefix systems with a sysroot,
+	# which is prepended to paths in ld scripts, so strip the prefix from these.
+	# Before: GROUP ( /foo/lib64/libc.so.6 /foo/usr/lib64/libc_nonshared.a  AS_NEEDED ( /foo/lib64/ld-linux-x86-64.so.2 ) )
+	# After: GROUP ( /lib64/libc.so.6 /usr/lib64/libc_nonshared.a  AS_NEEDED ( /lib64/ld-linux-x86-64.so.2 ) )
+	if [[ -n $(host_eprefix) ]] ; then
+		local file
+		grep -lZIF "ld script" "${ED}/$(alt_usrlibdir)"/lib*.{a,so} 2>/dev/null | while read -rd '' file ; do
+			sed -i "s|$(host_eprefix)/|/|g" "${file}" || die
+		done
+	fi
+
+	# We'll take care of the cache ourselves
+	rm -f "${ED}"/etc/ld.so.cache
+
+	# Everything past this point just needs to be done once ...
+	is_final_abi || return 0
+
+	# Make sure the non-native interp can be found on multilib systems even
+	# if the main library set isn't installed into the right place.  Maybe
+	# we should query the active gcc for info instead of hardcoding it ?
+	local i ldso_abi ldso_name
+	local ldso_abi_list=(
+		# x86
+		amd64   /lib64/ld-linux-x86-64.so.2
+		x32     /libx32/ld-linux-x32.so.2
+		x86     /lib/ld-linux.so.2
+		# mips
+		o32     /lib/ld.so.1
+		n32     /lib32/ld.so.1
+		n64     /lib64/ld.so.1
+		# powerpc
+		ppc     /lib/ld.so.1
+		# riscv
+		ilp32d  /lib/ld-linux-riscv32-ilp32d.so.1
+		ilp32   /lib/ld-linux-riscv32-ilp32.so.1
+		lp64d   /lib/ld-linux-riscv64-lp64d.so.1
+		lp64    /lib/ld-linux-riscv64-lp64.so.1
+		# s390
+		s390    /lib/ld.so.1
+		s390x   /lib/ld64.so.1
+		# sparc
+		sparc32 /lib/ld-linux.so.2
+		sparc64 /lib64/ld-linux.so.2
+	)
+	case $(tc-endian) in
+	little)
+		ldso_abi_list+=(
+			# arm
+			arm64   /lib/ld-linux-aarch64.so.1
+			# ELFv2 (glibc does not support ELFv1 on LE)
+			ppc64   /lib64/ld64.so.2
+		)
+		;;
+	big)
+		ldso_abi_list+=(
+			# arm
+			arm64   /lib/ld-linux-aarch64_be.so.1
+			# ELFv1 (glibc does not support ELFv2 on BE)
+			ppc64   /lib64/ld64.so.1
+		)
+		;;
+	esac
+	if [[ ${SYMLINK_LIB} == "yes" ]] && [[ ! -e ${ED}/$(alt_prefix)/lib ]] ; then
+		dosym $(get_abi_LIBDIR ${DEFAULT_ABI}) $(alt_prefix)/lib
+	fi
+	for (( i = 0; i < ${#ldso_abi_list[@]}; i += 2 )) ; do
+		ldso_abi=${ldso_abi_list[i]}
+		has ${ldso_abi} $(get_install_abis) || continue
+
+		ldso_name="$(alt_prefix)${ldso_abi_list[i+1]}"
+		if [[ ! -L ${ED}/${ldso_name} && ! -e ${ED}/${ldso_name} ]] ; then
+			dosym ../$(get_abi_LIBDIR ${ldso_abi})/${ldso_name##*/} ${ldso_name}
+		fi
+	done
+
+	# In the LSB 5.0 definition, someone had the excellent idea to "standardize"
+	# the runtime loader name, see also https://xkcd.com/927/
+	# Normally, in Gentoo one should never come across executables that require this.
+	# However, binary commercial packages are known to adhere to weird practices.
+	# https://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-AMD64/LSB-Core-AMD64.html#BASELIB
+	local lsb_ldso_name native_ldso_name lsb_ldso_abi
+	local lsb_ldso_abi_list=(
+		# x86
+		amd64	ld-linux-x86-64.so.2	ld-lsb-x86-64.so.3
+	)
+	for (( i = 0; i < ${#lsb_ldso_abi_list[@]}; i += 3 )) ; do
+		lsb_ldso_abi=${lsb_ldso_abi_list[i]}
+		native_ldso_name=${lsb_ldso_abi_list[i+1]}
+		lsb_ldso_name=${lsb_ldso_abi_list[i+2]}
+		has ${lsb_ldso_abi} $(get_install_abis) || continue
+
+		if [[ ! -L ${ED}/$(get_abi_LIBDIR ${lsb_ldso_abi})/${lsb_ldso_name} && ! -e ${ED}/$(get_abi_LIBDIR ${lsb_ldso_abi})/${lsb_ldso_name} ]] ; then
+			dosym ${native_ldso_name} "$(alt_prefix)/$(get_abi_LIBDIR ${lsb_ldso_abi})/${lsb_ldso_name}"
+		fi
+	done
+
+	# With devpts under Linux mounted properly, we do not need the pt_chown
+	# binary to be setuid.  This is because the default owners/perms will be
+	# exactly what we want.
+	if ! use suid ; then
+		find "${ED}" -name pt_chown -exec chmod -s {} +
+	fi
+
+	#################################################################
+	# EVERYTHING AFTER THIS POINT IS FOR NATIVE GLIBC INSTALLS ONLY #
+	#################################################################
+
+	# Make sure we install some symlink hacks so that when we build
+	# a 2nd stage cross-compiler, gcc finds the target system
+	# headers correctly.  See gcc/doc/gccinstall.info
+	if is_crosscompile ; then
+		# We need to make sure that /lib and /usr/lib always exists.
+		# gcc likes to use relative paths to get to its multilibs like
+		# /usr/lib/../lib64/.  So while we don't install any files into
+		# /usr/lib/, we do need it to exist.
+		keepdir $(alt_prefix)/lib
+		keepdir $(alt_prefix)/usr/lib
+
+		dosym usr/include $(alt_prefix)/sys-include
+		return 0
+	fi
+
+	# Files for Debian-style locale updating
+	dodir /usr/share/i18n
+	sed \
+		-e "/^#/d" \
+		-e "/SUPPORTED-LOCALES=/d" \
+		-e "s: \\\\::g" -e "s:/: :g" \
+		"${S}"/localedata/SUPPORTED > "${ED}"/usr/share/i18n/SUPPORTED \
+		|| die "generating /usr/share/i18n/SUPPORTED failed"
+
+	cd "${S}" || die
+
+	# Install misc network config files
+	insinto /etc
+	doins posix/gai.conf
+
+	if use systemd ; then
+		doins "${WORKDIR}/glibc-systemd-${GLIBC_SYSTEMD_VER}/gentoo-config/nsswitch.conf"
+	else
+		doins nss/nsswitch.conf
+	fi
+
+	# Gentoo-specific
+	newins "${FILESDIR}"/host.conf-1 host.conf
+
+	if use nscd ; then
+		doins nscd/nscd.conf
+
+		newinitd "$(prefixify_ro "${FILESDIR}"/nscd-1)" nscd
+
+		local nscd_args=(
+			-e "s:@PIDFILE@:$(strings "${ED}"/usr/sbin/nscd | grep nscd.pid):"
+		)
+
+		sed -i "${nscd_args[@]}" "${ED}"/etc/init.d/nscd
+
+		use systemd && systemd_dounit nscd/nscd.service
+		newtmpfiles nscd/nscd.tmpfiles nscd.conf
+	fi
+
+	echo 'LDPATH="include ld.so.conf.d/*.conf"' > "${T}"/00glibc
+	doenvd "${T}"/00glibc
+
+	for d in BUGS ChangeLog CONFORMANCE FAQ NEWS NOTES PROJECTS README* ; do
+		[[ -s ${d} ]] && dodoc ${d}
+	done
+	dodoc -r ChangeLog.old
+
+	# Prevent overwriting of the /etc/localtime symlink.  We'll handle the
+	# creation of the "factory" symlink in pkg_postinst().
+	rm -f "${ED}"/etc/localtime
+
+	# Generate all locales if this is a native build as locale generation
+	if use compile-locales && ! is_crosscompile ; then
+		run_locale_gen --inplace-glibc "${ED}/"
+	fi
+}
+
+glibc_headers_install() {
+	local builddir=$(builddir "headers")
+	cd "${builddir}"
+	emake install_root="${D}/$(build_eprefix)$(alt_prefix)" install-headers
+
+	insinto $(alt_headers)/gnu
+	doins "${S}"/include/gnu/stubs.h
+
+	# Make sure we install the sys-include symlink so that when
+	# we build a 2nd stage cross-compiler, gcc finds the target
+	# system headers correctly.  See gcc/doc/gccinstall.info
+	dosym usr/include $(alt_prefix)/sys-include
+}
+
+src_install() {
+	if just_headers ; then
+		export ABI=default
+		glibc_headers_install
+		return
+	fi
+
+	foreach_abi glibc_do_src_install
+
+	if ! use static-libs ; then
+		einfo "Not installing static glibc libraries"
+		find "${ED}" -name "*.a" -and -not -name "*_nonshared.a" -delete
+	fi
+}
+
+# Simple test to make sure our new glibc isn't completely broken.
+# Make sure we don't test with statically built binaries since
+# they will fail.  Also, skip if this glibc is a cross compiler.
+#
+# If coreutils is built with USE=multicall, some of these files
+# will just be wrapper scripts, not actual ELFs we can test.
+glibc_sanity_check() {
+	cd / #228809
+
+	# We enter ${ED} so to avoid trouble if the path contains
+	# special characters; for instance if the path contains the
+	# colon character (:), then the linker will try to split it
+	# and look for the libraries in an unexpected place. This can
+	# lead to unsafe code execution if the generated prefix is
+	# within a world-writable directory.
+	# (e.g. /var/tmp/portage:${HOSTNAME})
+	pushd "${ED}"/$(get_libdir) >/dev/null
+
+	# first let's find the actual dynamic linker here
+	# symlinks may point to the wrong abi
+	local newldso=$(find . -maxdepth 1 -name 'ld*so.?' -type f -print -quit)
+
+	einfo Last-minute run tests with ${newldso} in /$(get_libdir) ...
+
+	local x striptest
+	for x in cal date env free ls true uname uptime ; do
+		x=$(type -p ${x})
+		[[ -z ${x} || ${x} != ${EPREFIX}/* ]] && continue
+		striptest=$(LC_ALL="C" file -L ${x} 2>/dev/null) || continue
+		case ${striptest} in
+		*"statically linked"*) continue;;
+		*"ASCII text"*) continue;;
+		esac
+		# We need to clear the locale settings as the upgrade might want
+		# incompatible locale data.  This test is not for verifying that.
+		LC_ALL=C \
+		${newldso} --library-path . ${x} > /dev/null \
+			|| die "simple run test (${x}) failed"
+	done
+
+	popd >/dev/null
+}
+
+pkg_preinst() {
+	# nothing to do if just installing headers
+	just_headers && return
+
+	einfo "Checking general environment sanity."
+	sanity_prechecks
+
+	# prepare /etc/ld.so.conf.d/ for files
+	mkdir -p "${EROOT}"/etc/ld.so.conf.d
+
+	# Default /etc/hosts.conf:multi to on for systems with small dbs.
+	if [[ $(wc -l < "${EROOT}"/etc/hosts) -lt 1000 ]] ; then
+		sed -i '/^multi off/s:off:on:' "${ED}"/etc/host.conf
+		einfo "Defaulting /etc/host.conf:multi to on"
+	fi
+
+	[[ -n ${ROOT} ]] && return 0
+	[[ -d ${ED}/$(get_libdir) ]] || return 0
+	[[ -z ${BOOTSTRAP_RAP} ]] && glibc_sanity_check
+
+	if [[ -L ${EROOT}/usr/lib/locale ]]; then
+		# Help portage migrate this to a directory
+		# https://bugs.gentoo.org/753740
+		rm "${EROOT}"/usr/lib/locale || die
+	fi
+
+	# Keep around libcrypt so that Perl doesn't break when merging libxcrypt
+	# (libxcrypt is the new provider for now of libcrypt.so.{1,2}).
+	# bug #802207
+	if has_version "${CATEGORY}/${PN}[crypt]" && ! has preserve-libs ${FEATURES}; then
+		PRESERVED_OLD_LIBCRYPT=1
+		cp -p "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" \
+			"${T}/libcrypt$(get_libname 1)" || die
+	else
+		PRESERVED_OLD_LIBCRYPT=0
+	fi
+}
+
+glibc_refresh_ldconfig() {
+	if [[ ${MERGE_TYPE} == buildonly ]]; then
+		return
+	fi
+
+	# Version check could be added to avoid unnecessary work, but ldconfig
+	# should finish quickly enough to not matter.
+	ebegin "Refreshing ld.so.cache"
+	ldconfig -i
+	if ! eend $?; then
+		ewarn "Failed to refresh the ld.so.cache for you. Some programs may be broken"
+		ewarn "before you manually do so (ldconfig -i)."
+	fi
+}
+
+pkg_postinst() {
+	# nothing to do if just installing headers
+	just_headers && return
+
+	if ! tc-is-cross-compiler && [[ -x ${EROOT}/usr/sbin/iconvconfig ]] ; then
+		# Generate fastloading iconv module configuration file.
+		"${EROOT}"/usr/sbin/iconvconfig --prefix="${ROOT}/"
+	fi
+
+	if ! is_crosscompile && [[ -z ${ROOT} ]] ; then
+		# glibc-2.38+ on loong has ldconfig support added, but the ELF e_flags
+		# handling has changed as well, which means stale ldconfig auxiliary
+		# cache entries and failure to lookup libgcc_s / libstdc++ (breaking
+		# every C++ application) / libgomp etc., among other breakages.
+		#
+		# To fix this, simply refresh the ld.so.cache without using the
+		# auxiliary cache if we're natively installing on loong. This should
+		# be done relatively soon because we want to minimize the breakage
+		# window for the affected programs.
+		use loong && glibc_refresh_ldconfig
+
+		use compile-locales || run_locale_gen "${EROOT}/"
+	fi
+
+	upgrade_warning
+
+	# Check for sanity of /etc/nsswitch.conf, take 2
+	if [[ -e ${EROOT}/etc/nsswitch.conf ]] && ! has_version sys-auth/libnss-nis ; then
+		local entry
+		for entry in passwd group shadow; do
+			if grep -E -q "^[ \t]*${entry}:.*nis" "${EROOT}"/etc/nsswitch.conf; then
+				ewarn ""
+				ewarn "Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been"
+				ewarn "removed from glibc and is now provided by the package"
+				ewarn "  sys-auth/libnss-nis"
+				ewarn "Install it now to keep your NIS setup working."
+				ewarn ""
+			fi
+		done
+	fi
+
+	if [[ ${PRESERVED_OLD_LIBCRYPT} -eq 1 ]] ; then
+		cp -p "${T}/libcrypt$(get_libname 1)" "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" || die
+		preserve_old_lib_notify /$(get_libdir)/libcrypt$(get_libname 1)
+
+		elog "Please ignore a possible later error message about a file collision involving"
+		elog "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1). We need to preserve this file for the moment to keep"
+		elog "the upgrade working, but it also needs to be overwritten when"
+		elog "sys-libs/libxcrypt is installed. See bug 802210 for more details."
+	fi
+}
diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild
index c3dce15e7e99..93936304f66f 100644
--- a/sys-libs/glibc/glibc-9999.ebuild
+++ b/sys-libs/glibc/glibc-9999.ebuild
@@ -9,14 +9,6 @@ EAPI=8
 PYTHON_COMPAT=( python3_{10..12} )
 TMPFILES_OPTIONAL=1
 
-inherit python-any-r1 prefix preserve-libs toolchain-funcs flag-o-matic gnuconfig \
-	multilib systemd multiprocessing tmpfiles
-
-DESCRIPTION="GNU libc C library"
-HOMEPAGE="https://www.gnu.org/software/libc/"
-LICENSE="LGPL-2.1+ BSD HPND ISC inner-net rc PCRE"
-SLOT="2.2"
-
 EMULTILIB_PKG="true"
 
 # Gentoo patchset (ignored for live ebuilds)
@@ -40,6 +32,12 @@ MIN_PAX_UTILS_VER="1.3.3"
 # its seccomp filter!). Please double check this!
 MIN_SYSTEMD_VER="254.9-r1"
 
+inherit python-any-r1 prefix preserve-libs toolchain-funcs flag-o-matic gnuconfig \
+	multilib systemd multiprocessing tmpfiles
+
+DESCRIPTION="GNU libc C library"
+HOMEPAGE="https://www.gnu.org/software/libc/"
+
 if [[ ${PV} == 9999* ]]; then
 	inherit git-r3
 else
@@ -51,6 +49,8 @@ fi
 SRC_URI+=" multilib-bootstrap? ( https://dev.gentoo.org/~dilfridge/distfiles/gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz )"
 SRC_URI+=" systemd? ( https://gitweb.gentoo.org/proj/toolchain/glibc-systemd.git/snapshot/glibc-systemd-${GLIBC_SYSTEMD_VER}.tar.gz )"
 
+LICENSE="LGPL-2.1+ BSD HPND ISC inner-net rc PCRE"
+SLOT="2.2"
 IUSE="audit caps cet compile-locales custom-cflags doc gd hash-sysv-compat headers-only +multiarch multilib multilib-bootstrap nscd perl profile selinux +ssp stack-realign +static-libs suid systemd systemtap test vanilla"
 
 # Here's how the cross-compile logic breaks down ...
@@ -213,7 +213,9 @@ XFAIL_NSPAWN_TEST_LIST=(
 dump_build_environment() {
 	einfo ==== glibc build environment ========================================================
 	local v
-	for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC CXX CPP LD {AS,C,CPP,CXX,LD}FLAGS MAKEINFO NM AR AS STRIP RANLIB OBJCOPY STRINGS OBJDUMP READELF; do
+	for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC CXX CPP LD \
+		{AS,C,CPP,CXX,LD}FLAGS MAKEINFO NM AR AS STRIP RANLIB OBJCOPY \
+		STRINGS OBJDUMP READELF; do
 		einfo " $(printf '%15s' ${v}:)   ${!v}"
 	done
 	einfo =====================================================================================
@@ -256,7 +258,9 @@ alt_build_headers() {
 		if tc-is-cross-compiler ; then
 			ALT_BUILD_HEADERS=${SYSROOT}$(alt_headers)
 			if [[ ! -e ${ALT_BUILD_HEADERS}/linux/version.h ]] ; then
-				local header_path=$(echo '#include <linux/version.h>' | $(tc-getCPP ${CTARGET}) ${CFLAGS} 2>&1 | grep -o '[^"]*linux/version.h')
+				local header_path=$(echo '#include <linux/version.h>' \
+					| $(tc-getCPP ${CTARGET}) ${CFLAGS} 2>&1 \
+					| grep -o '[^"]*linux/version.h')
 				ALT_BUILD_HEADERS=${header_path%/linux/version.h}
 			fi
 		fi
@@ -1363,9 +1367,11 @@ glibc_do_src_install() {
 		# Move versioned .a file out of libdir to evade portage QA checks
 		# instead of using gen_usr_ldscript(). We fix ldscript as:
 		# "GROUP ( /usr/lib64/libm-<pv>.a ..." -> "GROUP ( /usr/lib64/glibc-<pv>/libm-<pv>.a ..."
-		sed -i "s@\(libm-${upstream_pv}.a\)@${P}/\1@" "${ED}"/$(alt_usrlibdir)/libm.a || die
+		sed -i "s@\(libm-${upstream_pv}.a\)@${P}/\1@" \
+			"${ED}"/$(alt_usrlibdir)/libm.a || die
 		dodir $(alt_usrlibdir)/${P}
-		mv "${ED}"/$(alt_usrlibdir)/libm-${upstream_pv}.a "${ED}"/$(alt_usrlibdir)/${P}/libm-${upstream_pv}.a || die
+		mv "${ED}"/$(alt_usrlibdir)/libm-${upstream_pv}.a \
+			"${ED}"/$(alt_usrlibdir)/${P}/libm-${upstream_pv}.a || die
 	fi
 
 	# We configure toolchains for standalone prefix systems with a sysroot,
@@ -1650,7 +1656,8 @@ pkg_preinst() {
 	# bug #802207
 	if has_version "${CATEGORY}/${PN}[crypt]" && ! has preserve-libs ${FEATURES}; then
 		PRESERVED_OLD_LIBCRYPT=1
-		cp -p "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" "${T}/libcrypt$(get_libname 1)" || die
+		cp -p "${EROOT}/$(get_libdir)/libcrypt$(get_libname 1)" \
+			"${T}/libcrypt$(get_libname 1)" || die
 	else
 		PRESERVED_OLD_LIBCRYPT=0
 	fi