dev-lang/spidermonkey : import from gentoo, compile with clang-12

9 files changed, 692 insertions, 0 deletions

diff --git a/dev-lang/spidermonkey/Manifest b/dev-lang/spidermonkey/Manifest
new file mode 100644
index 00000000..8507c456
--- /dev/null
+++ b/dev-lang/spidermonkey/Manifest
@@ -0,0 +1,3 @@
+DIST firefox-78.10.0esr.source.tar.xz 334642452 BLAKE2B a57e39e5f8d5bab08359957017bb44369598b49987b561176bcbb88b0bc10cd05214fd084faed872f4006e90e1b84a2f9b6f46049da763ef554d235c00d07519 SHA512 5e2cf137dc781855542c29df6152fa74ba749801640ade3cf01487ce993786b87a4f603d25c0af9323e67c7e15c75655523428c1c1426527b8623c7ded9f5946
+DIST firefox-78esr-patches-12.tar.xz 67840 BLAKE2B d85abdbb54a252852badac50866cf5b5009c050ec4aa80ae2454eef2719e80f3442f5a74ec58d3c36531539042830427cd85507b708c1d5b36ea44dd0cef60b7 SHA512 4445c0880fc234c3838394483ce986e4e222260a99427069ba9c55b56fcd49a485ec916ee6aa2629f922390e92bfcd78028e30cc2e62fad9bc080ae45b26ba2e
+DIST spidermonkey-78-patches-03.tar.xz 3732 BLAKE2B 5dc47527581c010994a102e6458119c762ec3836f57e403cbaac88c457f5f119bd75ae1a067307b20d229536f75db4b2b797408874d28156667ac63b61de8501 SHA512 f0921562dcd0ea519bf3f5ef2da43f87565e92493781d56e6e0b73d4124f41e7aadd34d8285bbb181f4286160dde0c9684920e98058f0683143a2687eb93cc1a
diff --git a/dev-lang/spidermonkey/files/moz38-dont-hardcode-libc-soname.patch b/dev-lang/spidermonkey/files/moz38-dont-hardcode-libc-soname.patch
new file mode 100644
index 00000000..708c7496
--- /dev/null
+++ b/dev-lang/spidermonkey/files/moz38-dont-hardcode-libc-soname.patch
@@ -0,0 +1,15 @@
+--- a/testing/mozbase/mozinfo/mozinfo/mozinfo.py	2018-01-12 12:21:16.764318254 -0500
++++ b/testing/mozbase/mozinfo/mozinfo/mozinfo.py	2018-01-12 12:22:23.392069398 -0500
+@@ -93,10 +93,11 @@
+ 
+ if info['os'] == 'linux':
+     import ctypes
++    import ctypes.util
+     import errno
+     PR_SET_SECCOMP = 22
+     SECCOMP_MODE_FILTER = 2
+-    ctypes.CDLL("libc.so.6", use_errno=True).prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, 0)
++    ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True).prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, 0)
+     info['has_sandbox'] = ctypes.get_errno() == errno.EFAULT
+ else:
+     info['has_sandbox'] = True
diff --git a/dev-lang/spidermonkey/files/spidermonkey-1.8.5-LTO.patch b/dev-lang/spidermonkey/files/spidermonkey-1.8.5-LTO.patch
new file mode 100644
index 00000000..7c36b552
--- /dev/null
+++ b/dev-lang/spidermonkey/files/spidermonkey-1.8.5-LTO.patch
@@ -0,0 +1,58 @@
+From 6ff7ad09daf98e5b804cf73c066c382a76e74e8c Mon Sep 17 00:00:00 2001
+From: Alexander Miller <alex.miller@gmx.de>
+Date: Wed, 12 Jun 2019 00:29:23 -0500
+Subject: [PATCH] Fix breakage with lto builds
+
+<artificial>:(.text+0x7a): undefined reference to `PopActiveVMFrame'
+collect2: error: ld returned 1 exit status
+
+Signed-off-by: Alexander Miller <alex.miller@gmx.de>
+---
+ js/src/methodjit/InvokeHelpers.cpp | 2 +-
+ js/src/methodjit/MethodJIT.cpp     | 6 +++---
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/js/src/methodjit/InvokeHelpers.cpp b/js/src/methodjit/InvokeHelpers.cpp
+index d017c2a..abde396 100644
+--- a/js/src/methodjit/InvokeHelpers.cpp
++++ b/js/src/methodjit/InvokeHelpers.cpp
+@@ -500,7 +500,7 @@ stubs::PutActivationObjects(VMFrame &f)
+     js::PutActivationObjects(f.cx, f.fp());
+ }
+ 
+-extern "C" void *
++extern "C" void * __attribute__((used))
+ js_InternalThrow(VMFrame &f)
+ {
+     JSContext *cx = f.cx;
+diff --git a/js/src/methodjit/MethodJIT.cpp b/js/src/methodjit/MethodJIT.cpp
+index 4feefbc..66099e6 100644
+--- a/js/src/methodjit/MethodJIT.cpp
++++ b/js/src/methodjit/MethodJIT.cpp
+@@ -120,20 +120,20 @@ static uint32 StubCallsForOp[STUB_CALLS_FOR_OP_COUNT];
+ 
+ extern "C" void JaegerTrampolineReturn();
+ 
+-extern "C" void JS_FASTCALL
++extern "C" void JS_FASTCALL __attribute__((used))
+ PushActiveVMFrame(VMFrame &f)
+ {
+     f.entryfp->script()->compartment->jaegerCompartment->pushActiveFrame(&f);
+     f.regs.fp->setNativeReturnAddress(JS_FUNC_TO_DATA_PTR(void*, JaegerTrampolineReturn));
+ }
+ 
+-extern "C" void JS_FASTCALL
++extern "C" void JS_FASTCALL __attribute__((used))
+ PopActiveVMFrame(VMFrame &f)
+ {
+     f.entryfp->script()->compartment->jaegerCompartment->popActiveFrame();
+ }
+ 
+-extern "C" void JS_FASTCALL
++extern "C" void JS_FASTCALL __attribute__((used))
+ SetVMFrameRegs(VMFrame &f)
+ {
+     f.cx->setCurrentRegs(&f.regs);
+-- 
+2.22.0
+
diff --git a/dev-lang/spidermonkey/files/spidermonkey-52.0-fix-alpha-bitness.patch b/dev-lang/spidermonkey/files/spidermonkey-52.0-fix-alpha-bitness.patch
new file mode 100644
index 00000000..b0f87296
--- /dev/null
+++ b/dev-lang/spidermonkey/files/spidermonkey-52.0-fix-alpha-bitness.patch
@@ -0,0 +1,32 @@
+
+# HG changeset patch
+# User John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
+# Date 1482966103 -3600
+# Node ID 1f4d99d8dff27bcc25eff21dc6a16dae63f48595
+# Parent  ce9e9f0dc752896ac7ba00bb0610b3f731e948b0
+Bug 1326496 - mozbuild: Fix bitness from 32 to 64 bits on alpha. r=glandium
+
+
+diff --git a/python/mozbuild/mozbuild/configure/constants.py b/python/mozbuild/mozbuild/configure/constants.py
+--- a/python/mozbuild/mozbuild/configure/constants.py
++++ b/python/mozbuild/mozbuild/configure/constants.py
+@@ -35,17 +35,17 @@ Kernel = EnumString.subclass(
+     'Linux',
+     'NetBSD',
+     'OpenBSD',
+     'WINNT',
+ )
+ 
+ CPU_bitness = {
+     'aarch64': 64,
+-    'Alpha': 32,
++    'Alpha': 64,
+     'arm': 32,
+     'hppa': 32,
+     'ia64': 64,
+     'mips32': 32,
+     'mips64': 64,
+     'ppc': 32,
+     'ppc64': 64,
+     's390': 32,
+
diff --git a/dev-lang/spidermonkey/files/spidermonkey-52.0-gcc9-overflow.patch b/dev-lang/spidermonkey/files/spidermonkey-52.0-gcc9-overflow.patch
new file mode 100644
index 00000000..c7eb0f62
--- /dev/null
+++ b/dev-lang/spidermonkey/files/spidermonkey-52.0-gcc9-overflow.patch
@@ -0,0 +1,24 @@
+From 311fc467219ab6ee9eed60759b58a8066c4bf36d Mon Sep 17 00:00:00 2001
+From: 
+Date: Thu, 25 Jul 2019 10:00:33 -0500
+Subject: [PATCH] gcc-9 overflow fix
+
+---
+ js/src/jsapi-tests/testPrintf.cpp | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/js/src/jsapi-tests/testPrintf.cpp b/js/src/jsapi-tests/testPrintf.cpp
+index 51486856..03cc118d 100644
+--- a/js/src/jsapi-tests/testPrintf.cpp
++++ b/js/src/jsapi-tests/testPrintf.cpp
+@@ -55,7 +55,6 @@ BEGIN_TEST(testPrintf)
+     CHECK(print_one("27270", "%zu", (size_t) 27270));
+     CHECK(print_one("27270", "%" PRIuSIZE, (size_t) 27270));
+     CHECK(print_one("hello", "he%so", "ll"));
+-    CHECK(print_one("(null)", "%s", zero()));
+     CHECK(print_one("0", "%p", (char *) 0));
+     CHECK(print_one("h", "%c", 'h'));
+     CHECK(print_one("1.500000", "%f", 1.5f));
+-- 
+2.22.0
+
diff --git a/dev-lang/spidermonkey/files/spidermonkey-60.5.2-ia64-fix-virtual-address-length.patch b/dev-lang/spidermonkey/files/spidermonkey-60.5.2-ia64-fix-virtual-address-length.patch
new file mode 100644
index 00000000..8b2245f1
--- /dev/null
+++ b/dev-lang/spidermonkey/files/spidermonkey-60.5.2-ia64-fix-virtual-address-length.patch
@@ -0,0 +1,59 @@
+From 8099213b51180254b322332ecd573239da4212c4 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyfox@gentoo.org>
+Date: Thu, 23 Jan 2020 22:57:53 +0000
+Subject: [PATCH] ProcessExecutableMemory.cpp: fix virtual address length on
+ ia64
+
+ia64's usable virtual address space is page dependent. For 16K
+pages with 3 levels of page tables de can address only 44 bits
+of virtual memory, not default 47.
+
+The change makes page size detection dynamic and adapts to
+addressable bits. On ia64 it is '4 * log2(page_size/8)'.
+
+Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
+---
+ js/src/jit/ProcessExecutableMemory.cpp | 25 +++++++++++++++++++++++++
+ 1 file changed, 25 insertions(+)
+
+diff --git a/js/src/jit/ProcessExecutableMemory.cpp b/js/src/jit/ProcessExecutableMemory.cpp
+index 9e55c262..8581c150 100644
+--- a/js/src/jit/ProcessExecutableMemory.cpp
++++ b/js/src/jit/ProcessExecutableMemory.cpp
+
+@@ -248,7 +248,32 @@ static void* ComputeRandomAllocationAddress() {
+   // x64 CPUs have a 48-bit address space and on some platforms the OS will
+   // give us access to 47 bits, so to be safe we right shift by 18 to leave
+   // 46 bits.
++# ifdef __ia64__
++  // On ia64 virtual address space looks like one of:
++  //   virt_addr_64 = [ <63..61> | <unimplemented> | L3 | L2 | L1 | offset ]
++  //   virt_addr_64 = [ <63..61> | <unimplemented> | L4 | L3 | L2 | L1 | offset ]
++  // where L{1..L4} are page tables. Each page table (except top-level L3 or L4)
++  // is itself a page-size entry and can store PageSize / 8 entries. Top-level
++  // entry is 1/8 of of L1/L2 (as 3 upper bits are part of <63..61> address part).
++  // Note: that makes addressable size directly depend on page size.
++  //
++  // We conservatively assume 3 levels of page tables here. This makes the
++  // following formula:
++  //   L3     = log2(PAGE / 8 / 8) = log2(PAGE / 8) - 3
++  //   L2                          = log2(PAGE / 8)
++  //   L1                          = log2(PAGE / 8)
++  //   offset = log2(PAGE)         = log2(PAGE / 8) + 3
++  // thus
++  //  L3 + L2 + L1 + offset = 4 * log2(PAGE / 8)
++  // For more details see http://www.ia64-linux.org/doc/IA64linuxkernel.PDF
++  // (slide 19: "user regions").
++  static uint64_t ia64_virt_bits = std::min<uint64_t>(
++      4 * (mozilla::FloorLog2(gc::SystemPageSize() / 8)),
++      46);
++  rand >>= (64 - ia64_virt_bits);
++# else
+   rand >>= 18;
++# endif
+ #else
+   // On 32-bit, right shift by 34 to leave 30 bits, range [0, 1GiB). Then add
+   // 512MiB to get range [512MiB, 1.5GiB), or [0x20000000, 0x60000000). This
+-- 
+2.25.0
+
diff --git a/dev-lang/spidermonkey/files/spidermonkey-60.5.2-ia64-support.patch b/dev-lang/spidermonkey/files/spidermonkey-60.5.2-ia64-support.patch
new file mode 100644
index 00000000..90c8a4c9
--- /dev/null
+++ b/dev-lang/spidermonkey/files/spidermonkey-60.5.2-ia64-support.patch
@@ -0,0 +1,44 @@
+From 35d787c782a075c0a01e29605d254950fd1e81a6 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyfox@gentoo.org>
+Date: Thu, 25 Jul 2019 10:17:39 -0500
+Subject: [PATCH] Add support for ia64 atomic-ops
+
+Signed-off-by: Jory Pratt <anarchy@gentoo.org>
+---
+ js/src/jit/AtomicOperations.h                    | 2 ++
+ js/src/jit/none/AtomicOperations-feeling-lucky.h | 6 ++++++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/js/src/jit/AtomicOperations.h b/js/src/jit/AtomicOperations.h
+index 3501e65b..44c3f358 100644
+--- a/js/src/jit/AtomicOperations.h
++++ b/js/src/jit/AtomicOperations.h
+@@ -393,6 +393,8 @@ inline bool AtomicOperations::isLockfreeJS(int32_t size) {
+ #include "jit/none/AtomicOperations-feeling-lucky.h"
+ #elif defined(__s390__) || defined(__s390x__)
+ #include "jit/none/AtomicOperations-feeling-lucky.h"
++#elif defined(__ia64__)
++#include "jit/none/AtomicOperations-feeling-lucky.h"
+ #else
+ #error "No AtomicOperations support provided for this platform"
+ #endif
+diff --git a/js/src/jit/none/AtomicOperations-feeling-lucky.h b/js/src/jit/none/AtomicOperations-feeling-lucky.h
+index c0b43699..a3f4497e 100644
+--- a/js/src/jit/none/AtomicOperations-feeling-lucky.h
++++ b/js/src/jit/none/AtomicOperations-feeling-lucky.h
+@@ -80,6 +80,12 @@
+ #define GNUC_COMPATIBLE
+ #endif
+ 
++#ifdef __ia64__
++#define HAS_64BIT_ATOMICS
++#define HAS_64BIT_LOCKFREE
++#define GNUC_COMPATIBLE
++#endif
++
+ // The default implementation tactic for gcc/clang is to use the newer
+ // __atomic intrinsics added for use in C++11 <atomic>.  Where that
+ // isn't available, we use GCC's older __sync functions instead.
+-- 
+2.22.0
+
diff --git a/dev-lang/spidermonkey/files/spidermonkey-perl-defined-array-check.patch b/dev-lang/spidermonkey/files/spidermonkey-perl-defined-array-check.patch
new file mode 100644
index 00000000..c3996ae8
--- /dev/null
+++ b/dev-lang/spidermonkey/files/spidermonkey-perl-defined-array-check.patch
@@ -0,0 +1,11 @@
+--- a/js/src/config/milestone.pl	2013-02-11 17:33:22.000000000 -0500
++++ b/js/src/config/milestone.pl	2015-07-15 10:44:31.676153600 -0400
+@@ -55,7 +55,7 @@
+ #
+ my $milestone = Moz::Milestone::getOfficialMilestone($MILESTONE_FILE);
+ 
+-if (defined(@TEMPLATE_FILE)) {
++if (@TEMPLATE_FILE) {
+   my $TFILE;
+ 
+   foreach $TFILE (@TEMPLATE_FILE) {
diff --git a/dev-lang/spidermonkey/spidermonkey-78.10.0-r10.ebuild b/dev-lang/spidermonkey/spidermonkey-78.10.0-r10.ebuild
new file mode 100644
index 00000000..e5bacf41
--- /dev/null
+++ b/dev-lang/spidermonkey/spidermonkey-78.10.0-r10.ebuild
@@ -0,0 +1,446 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="7"
+
+# Patch version
+FIREFOX_PATCHSET="firefox-78esr-patches-12.tar.xz"
+SPIDERMONKEY_PATCHSET="spidermonkey-78-patches-03.tar.xz"
+
+LLVM_MAX_SLOT=12
+
+PYTHON_COMPAT=( python3_{7..9} )
+
+WANT_AUTOCONF="2.1"
+
+inherit autotools check-reqs flag-o-matic llvm multiprocessing python-any-r1 toolchain-funcs
+
+MY_PN="mozjs"
+MY_PV="${PV/_pre*}" # Handle Gentoo pre-releases
+
+MY_MAJOR=$(ver_cut 1)
+
+MOZ_ESR=yes
+
+MOZ_PV=${PV}
+MOZ_PV_SUFFIX=
+if [[ ${PV} =~ (_(alpha|beta|rc).*)$ ]] ; then
+	MOZ_PV_SUFFIX=${BASH_REMATCH[1]}
+
+	# Convert the ebuild version to the upstream Mozilla version
+	MOZ_PV="${MOZ_PV/_alpha/a}" # Handle alpha for SRC_URI
+	MOZ_PV="${MOZ_PV/_beta/b}"  # Handle beta for SRC_URI
+	MOZ_PV="${MOZ_PV%%_rc*}"    # Handle rc for SRC_URI
+fi
+
+if [[ -n ${MOZ_ESR} ]] ; then
+	# ESR releases have slightly different version numbers
+	MOZ_PV="${MOZ_PV}esr"
+fi
+
+MOZ_PN="firefox"
+MOZ_P="${MOZ_PN}-${MOZ_PV}"
+MOZ_PV_DISTFILES="${MOZ_PV}${MOZ_PV_SUFFIX}"
+MOZ_P_DISTFILES="${MOZ_PN}-${MOZ_PV_DISTFILES}"
+
+MOZ_SRC_BASE_URI="https://archive.mozilla.org/pub/${MOZ_PN}/releases/${MOZ_PV}"
+
+if [[ ${PV} == *_rc* ]] ; then
+	MOZ_SRC_BASE_URI="https://archive.mozilla.org/pub/${MOZ_PN}/candidates/${MOZ_PV}-candidates/build${PV##*_rc}"
+fi
+
+PATCH_URIS=(
+	https://dev.gentoo.org/~{whissi,polynomial-c,axs}/mozilla/patchsets/${FIREFOX_PATCHSET}
+	https://dev.gentoo.org/~{whissi,polynomial-c,axs}/mozilla/patchsets/${SPIDERMONKEY_PATCHSET}
+)
+
+SRC_URI="${MOZ_SRC_BASE_URI}/source/${MOZ_P}.source.tar.xz -> ${MOZ_P_DISTFILES}.source.tar.xz
+	${PATCH_URIS[@]}"
+
+DESCRIPTION="SpiderMonkey is Mozilla's JavaScript engine written in C and C++"
+HOMEPAGE="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey"
+
+KEYWORDS="amd64 arm arm64 ~mips ppc64 ~s390 x86"
+
+SLOT="78"
+LICENSE="MPL-2.0"
+IUSE="clang cpu_flags_arm_neon debug +jit lto test"
+
+RESTRICT="!test? ( test )"
+
+BDEPEND="${PYTHON_DEPS}
+	>=virtual/rust-1.41.0
+	virtual/pkgconfig
+	|| (
+		(
+			sys-devel/llvm:12
+			clang? (
+				sys-devel/clang:12
+				lto? ( =sys-devel/lld-12* )
+			)
+		)
+		(
+			sys-devel/llvm:11
+			clang? (
+				sys-devel/clang:11
+				lto? ( =sys-devel/lld-11* )
+			)
+		)
+		(
+			sys-devel/llvm:10
+			clang? (
+				sys-devel/clang:10
+				lto? ( =sys-devel/lld-10* )
+			)
+		)
+	)
+	lto? (
+		!clang? ( sys-devel/binutils[gold] )
+	)"
+
+CDEPEND=">=dev-libs/icu-67.1:=
+	>=dev-libs/nspr-4.25
+	sys-libs/readline:0=
+	>=sys-libs/zlib-1.2.3"
+
+DEPEND="${CDEPEND}
+	test? (
+		$(python_gen_any_dep 'dev-python/six[${PYTHON_USEDEP}]')
+	)"
+
+RDEPEND="${CDEPEND}"
+
+S="${WORKDIR}/firefox-${MY_PV}/js/src"
+
+llvm_check_deps() {
+	if use clang ; then
+		if ! has_version -b "sys-devel/clang:${LLVM_SLOT}" ; then
+			ewarn "sys-devel/clang:${LLVM_SLOT} is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
+			return 1
+		fi
+
+		if use lto ; then
+			if ! has_version -b "=sys-devel/lld-${LLVM_SLOT}*" ; then
+				ewarn "=sys-devel/lld-${LLVM_SLOT}* is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
+				return 1
+			fi
+		fi
+	fi
+
+	einfo "Using LLVM slot ${LLVM_SLOT} to build" >&2
+}
+
+python_check_deps() {
+	if use test ; then
+		has_version "dev-python/six[${PYTHON_USEDEP}]"
+	fi
+}
+
+pkg_pretend() {
+	if use test ; then
+		CHECKREQS_DISK_BUILD="7600M"
+	else
+		CHECKREQS_DISK_BUILD="6400M"
+	fi
+
+	check-reqs_pkg_pretend
+}
+
+pkg_setup() {
+	if [[ ${MERGE_TYPE} != binary ]] ; then
+		if use test ; then
+			CHECKREQS_DISK_BUILD="7600M"
+		else
+			CHECKREQS_DISK_BUILD="6400M"
+		fi
+
+		check-reqs_pkg_setup
+
+		llvm_pkg_setup
+
+		if use clang && use lto ; then
+			local version_lld=$(ld.lld --version 2>/dev/null | awk '{ print $2 }')
+			[[ -n ${version_lld} ]] && version_lld=$(ver_cut 1 "${version_lld}")
+			[[ -z ${version_lld} ]] && die "Failed to read ld.lld version!"
+
+			# temp fix for https://bugs.gentoo.org/768543
+			# we can assume that rust 1.{49,50}.0 always uses llvm 11
+			local version_rust=$(rustc -Vv 2>/dev/null | grep -F -- 'release:' | awk '{ print $2 }')
+			[[ -n ${version_rust} ]] && version_rust=$(ver_cut 1-2 "${version_rust}")
+			[[ -z ${version_rust} ]] && die "Failed to read version from rustc!"
+
+			if ver_test "${version_rust}" -ge "1.49" && ver_test "${version_rust}" -le "1.50" ; then
+				local version_llvm_rust="11"
+			else
+				local version_llvm_rust=$(rustc -Vv 2>/dev/null | grep -F -- 'LLVM version:' | awk '{ print $3 }')
+				[[ -n ${version_llvm_rust} ]] && version_llvm_rust=$(ver_cut 1 "${version_llvm_rust}")
+				[[ -z ${version_llvm_rust} ]] && die "Failed to read used LLVM version from rustc!"
+			fi
+
+			if ver_test "${version_lld}" -ne "${version_llvm_rust}" ; then
+				eerror "Rust is using LLVM version ${version_llvm_rust} but ld.lld version belongs to LLVM version ${version_lld}."
+				eerror "You will be unable to link ${CATEGORY}/${PN}. To proceed you have the following options:"
+				eerror "  - Manually switch rust version using 'eselect rust' to match used LLVM version"
+				eerror "  - Switch to dev-lang/rust[system-llvm] which will guarantee matching version"
+				eerror "  - Build ${CATEGORY}/${PN} without USE=lto"
+				die "LLVM version used by Rust (${version_llvm_rust}) does not match with ld.lld version (${version_lld})!"
+			fi
+		fi
+
+		python-any-r1_pkg_setup
+
+		# Build system is using /proc/self/oom_score_adj, bug #604394
+		addpredict /proc/self/oom_score_adj
+
+		if ! mountpoint -q /dev/shm ; then
+			# If /dev/shm is not available, configure is known to fail with
+			# a traceback report referencing /usr/lib/pythonN.N/multiprocessing/synchronize.py
+			ewarn "/dev/shm is not mounted -- expect build failures!"
+		fi
+
+		# Ensure we use C locale when building, bug #746215
+		export LC_ALL=C
+	fi
+}
+
+src_prepare() {
+	pushd ../.. &>/dev/null || die
+
+	use lto && rm -v "${WORKDIR}"/firefox-patches/*-LTO-Only-enable-LTO-*.patch
+
+	eapply "${WORKDIR}"/firefox-patches
+	eapply "${WORKDIR}"/spidermonkey-patches
+
+	default
+
+	# Make LTO respect MAKEOPTS
+	sed -i \
+		-e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
+		build/moz.configure/lto-pgo.configure \
+		|| die "sed failed to set num_cores"
+
+	# sed-in toolchain prefix
+	sed -i \
+		-e "s/objdump/${CHOST}-objdump/" \
+		python/mozbuild/mozbuild/configure/check_debug_ranges.py \
+		|| die "sed failed to set toolchain prefix"
+
+	einfo "Removing pre-built binaries ..."
+	find third_party -type f \( -name '*.so' -o -name '*.o' \) -print -delete || die
+
+	MOZJS_BUILDDIR="${WORKDIR}/build"
+	mkdir "${MOZJS_BUILDDIR}" || die
+
+	popd &>/dev/null || die
+	eautoconf
+}
+
+src_configure() {
+	# Show flags set at the beginning
+	einfo "Current CFLAGS:    ${CFLAGS}"
+	einfo "Current CXXFLAGS:  ${CXXFLAGS}"
+	einfo "Current LDFLAGS:   ${LDFLAGS}"
+	einfo "Current RUSTFLAGS: ${RUSTFLAGS}"
+
+	local have_switched_compiler=
+	if use clang && ! tc-is-clang ; then
+		# Force clang
+		einfo "Enforcing the use of clang due to USE=clang ..."
+		have_switched_compiler=yes
+		AR=llvm-ar
+		CC=${CHOST}-clang
+		CXX=${CHOST}-clang++
+		NM=llvm-nm
+		RANLIB=llvm-ranlib
+	elif ! use clang && ! tc-is-gcc ; then
+		# Force gcc
+		have_switched_compiler=yes
+		einfo "Enforcing the use of gcc due to USE=-clang ..."
+		AR=gcc-ar
+		CC=${CHOST}-gcc
+		CXX=${CHOST}-g++
+		NM=gcc-nm
+		RANLIB=gcc-ranlib
+	fi
+
+	if [[ -n "${have_switched_compiler}" ]] ; then
+		# Because we switched active compiler we have to ensure
+		# that no unsupported flags are set
+		strip-unsupported-flags
+	fi
+
+	# Ensure we use correct toolchain
+	export HOST_CC="$(tc-getBUILD_CC)"
+	export HOST_CXX="$(tc-getBUILD_CXX)"
+	tc-export CC CXX LD AR NM OBJDUMP RANLIB PKG_CONFIG
+
+	cd "${MOZJS_BUILDDIR}" || die
+
+	# ../python/mach/mach/mixin/process.py fails to detect SHELL
+	export SHELL="${EPREFIX}/bin/bash"
+
+	local -a myeconfargs=(
+		--host="${CBUILD:-${CHOST}}"
+		--target="${CHOST}"
+		--disable-jemalloc
+		--disable-optimize
+		--disable-strip
+		--enable-readline
+		--enable-shared-js
+		--with-intl-api
+		--with-system-icu
+		--with-system-nspr
+		--with-system-zlib
+		--with-toolchain-prefix="${CHOST}-"
+		$(use_enable debug)
+		$(use_enable jit)
+		$(use_enable test tests)
+	)
+
+	if ! use x86 && [[ ${CHOST} != armv*h* ]] ; then
+		myeconfargs+=( --enable-rust-simd )
+	fi
+
+	# Modifications to better support ARM, bug 717344
+	if use cpu_flags_arm_neon ; then
+		myeconfargs+=( --with-fpu=neon )
+
+		if ! tc-is-clang ; then
+			# thumb options aren't supported when using clang, bug 666966
+			myeconfargs+=( --with-thumb=yes )
+			myeconfargs+=( --with-thumb-interwork=no )
+		fi
+	fi
+
+	# Tell build system that we want to use LTO
+	if use lto ; then
+		myeconfargs+=( --enable-lto )
+
+		if use clang ; then
+			myeconfargs+=( --enable-linker=lld )
+		else
+			myeconfargs+=( --enable-linker=gold )
+		fi
+	fi
+
+	# LTO flag was handled via configure
+	filter-flags '-flto*'
+
+	if tc-is-gcc ; then
+		if ver_test $(gcc-fullversion) -ge 10 ; then
+			einfo "Forcing -fno-tree-loop-vectorize to workaround GCC bug, see bug 758446 ..."
+			append-cxxflags -fno-tree-loop-vectorize
+		fi
+	fi
+
+	# Show flags we will use
+	einfo "Build CFLAGS:    ${CFLAGS}"
+	einfo "Build CXXFLAGS:  ${CXXFLAGS}"
+	einfo "Build LDFLAGS:   ${LDFLAGS}"
+	einfo "Build RUSTFLAGS: ${RUSTFLAGS}"
+
+	# Forcing system-icu allows us to skip patching bundled ICU for PPC
+	# and other minor arches
+	ECONF_SOURCE="${S}" \
+		econf \
+		${myeconfargs[@]} \
+		XARGS="${EPREFIX}/usr/bin/xargs"
+}
+
+src_compile() {
+	cd "${MOZJS_BUILDDIR}" || die
+	default
+}
+
+src_test() {
+	if "${MOZJS_BUILDDIR}/js/src/js" -e 'print("Hello world!")'; then
+		einfo "Smoke-test successful, continuing with full test suite"
+	else
+		die "Smoke-test failed: did interpreter initialization fail?"
+	fi
+
+	local -a KNOWN_TESTFAILURES
+	KNOWN_TESTFAILURES+=( non262/Date/reset-time-zone-cache-same-offset.js )
+	KNOWN_TESTFAILURES+=( non262/Date/time-zone-path.js )
+	KNOWN_TESTFAILURES+=( non262/Date/time-zones-historic.js )
+	KNOWN_TESTFAILURES+=( non262/Date/time-zones-imported.js )
+	KNOWN_TESTFAILURES+=( non262/Date/toString-localized.js )
+	KNOWN_TESTFAILURES+=( non262/Date/toString-localized-posix.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/Date/toLocaleString_timeZone.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/Date/toLocaleDateString_timeZone.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/format.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/format_timeZone.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/timeZone_backward_links.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/tz-environment-variable.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/DisplayNames/language.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/DisplayNames/region.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/Locale/likely-subtags.js )
+	KNOWN_TESTFAILURES+=( non262/Intl/Locale/likely-subtags-generated.js )
+	KNOWN_TESTFAILURES+=( test262/intl402/Locale/prototype/minimize/removing-likely-subtags-first-adds-likely-subtags.js )
+
+	if use x86 ; then
+		KNOWN_TESTFAILURES+=( non262/Date/timeclip.js )
+		KNOWN_TESTFAILURES+=( test262/built-ins/Number/prototype/toPrecision/return-values.js )
+		KNOWN_TESTFAILURES+=( test262/language/types/number/S8.5_A2.1.js )
+		KNOWN_TESTFAILURES+=( test262/language/types/number/S8.5_A2.2.js )
+	fi
+
+	if [[ $(tc-endian) == "big" ]] ; then
+		KNOWN_TESTFAILURES+=( test262/built-ins/TypedArray/prototype/set/typedarray-arg-set-values-same-buffer-other-type.js )
+	fi
+
+	echo "" > "${T}"/known_failures.list || die
+
+	local KNOWN_TESTFAILURE
+	for KNOWN_TESTFAILURE in ${KNOWN_TESTFAILURES[@]} ; do
+		echo "${KNOWN_TESTFAILURE}" >> "${T}"/known_failures.list
+	done
+
+	PYTHONPATH="${S}/tests/lib" \
+		${PYTHON} \
+		"${S}"/tests/jstests.py -d -s -t 1800 --wpt=disabled --no-progress \
+		--exclude-file="${T}"/known_failures.list \
+		"${MOZJS_BUILDDIR}"/js/src/js \
+		|| die
+
+	if use jit ; then
+		KNOWN_TESTFAILURES=()
+
+		echo "" > "${T}"/known_failures.list || die
+
+		for KNOWN_TESTFAILURE in ${KNOWN_TESTFAILURES[@]} ; do
+			echo "${KNOWN_TESTFAILURE}" >> "${T}"/known_failures.list
+		done
+
+		PYTHONPATH="${S}/tests/lib" \
+			${PYTHON} \
+			"${S}"/tests/jstests.py -d -s -t 1800 --wpt=disabled --no-progress \
+			--exclude-file="${T}"/known_failures.list \
+			"${MOZJS_BUILDDIR}"/js/src/js basic \
+			|| die
+	fi
+}
+
+src_install() {
+	cd "${MOZJS_BUILDDIR}" || die
+	default
+
+	# fix soname links
+	pushd "${ED}"/usr/$(get_libdir) &>/dev/null || die
+	mv lib${MY_PN}-${MY_MAJOR}.so lib${MY_PN}-${MY_MAJOR}.so.0.0.0 || die
+	ln -s lib${MY_PN}-${MY_MAJOR}.so.0.0.0 lib${MY_PN}-${MY_MAJOR}.so.0 || die
+	ln -s lib${MY_PN}-${MY_MAJOR}.so.0 lib${MY_PN}-${MY_MAJOR}.so || die
+	popd &>/dev/null || die
+
+	# remove unneeded files
+	rm \
+		"${ED}"/usr/bin/js${MY_MAJOR}-config \
+		"${ED}"/usr/$(get_libdir)/libjs_static.ajs \
+		|| die
+
+	# fix permissions
+	chmod -x \
+		"${ED}"/usr/$(get_libdir)/pkgconfig/*.pc \
+		"${ED}"/usr/include/mozjs-${MY_MAJOR}/js-config.h \
+		|| die
+}