reinit the tree, so we can have metadata

1 files changed, 1002 insertions, 0 deletions

diff --git a/eclass/toolchain-funcs.eclass b/eclass/toolchain-funcs.eclass
new file mode 100644
index 000000000000..aeb6f7c70299
--- /dev/null
+++ b/eclass/toolchain-funcs.eclass
@@ -0,0 +1,1002 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: toolchain-funcs.eclass
+# @MAINTAINER:
+# Toolchain Ninjas <toolchain@gentoo.org>
+# @BLURB: functions to query common info about the toolchain
+# @DESCRIPTION:
+# The toolchain-funcs aims to provide a complete suite of functions
+# for gleaning useful information about the toolchain and to simplify
+# ugly things like cross-compiling and multilib.  All of this is done
+# in such a way that you can rely on the function always returning
+# something sane.
+
+if [[ -z ${_TOOLCHAIN_FUNCS_ECLASS} ]]; then
+_TOOLCHAIN_FUNCS_ECLASS=1
+
+inherit multilib
+
+# tc-getPROG <VAR [search vars]> <default> [tuple]
+_tc-getPROG() {
+	local tuple=$1
+	local v var vars=$2
+	local prog=( $3 )
+
+	var=${vars%% *}
+	for v in ${vars} ; do
+		if [[ -n ${!v} ]] ; then
+			export ${var}="${!v}"
+			echo "${!v}"
+			return 0
+		fi
+	done
+
+	local search=
+	[[ -n $4 ]] && search=$(type -p $4-${prog[0]})
+	[[ -z ${search} && -n ${!tuple} ]] && search=$(type -p ${!tuple}-${prog[0]})
+	[[ -n ${search} ]] && prog[0]=${search##*/}
+
+	export ${var}="${prog[*]}"
+	echo "${!var}"
+}
+tc-getBUILD_PROG() { _tc-getPROG CBUILD "BUILD_$1 $1_FOR_BUILD HOST$1" "${@:2}"; }
+tc-getPROG() { _tc-getPROG CHOST "$@"; }
+
+# @FUNCTION: tc-getAR
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the archiver
+tc-getAR() { tc-getPROG AR ar "$@"; }
+# @FUNCTION: tc-getAS
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the assembler
+tc-getAS() { tc-getPROG AS as "$@"; }
+# @FUNCTION: tc-getCC
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the C compiler
+tc-getCC() { tc-getPROG CC gcc "$@"; }
+# @FUNCTION: tc-getCPP
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the C preprocessor
+tc-getCPP() { tc-getPROG CPP "${CC:-gcc} -E" "$@"; }
+# @FUNCTION: tc-getCXX
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the C++ compiler
+tc-getCXX() { tc-getPROG CXX g++ "$@"; }
+# @FUNCTION: tc-getLD
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the linker
+tc-getLD() { tc-getPROG LD ld "$@"; }
+# @FUNCTION: tc-getSTRIP
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the strip program
+tc-getSTRIP() { tc-getPROG STRIP strip "$@"; }
+# @FUNCTION: tc-getNM
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the symbol/object thingy
+tc-getNM() { tc-getPROG NM nm "$@"; }
+# @FUNCTION: tc-getRANLIB
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the archiver indexer
+tc-getRANLIB() { tc-getPROG RANLIB ranlib "$@"; }
+# @FUNCTION: tc-getOBJCOPY
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the object copier
+tc-getOBJCOPY() { tc-getPROG OBJCOPY objcopy "$@"; }
+# @FUNCTION: tc-getOBJDUMP
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the object dumper
+tc-getOBJDUMP() { tc-getPROG OBJDUMP objdump "$@"; }
+# @FUNCTION: tc-getF77
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the Fortran 77 compiler
+tc-getF77() { tc-getPROG F77 gfortran "$@"; }
+# @FUNCTION: tc-getFC
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the Fortran 90 compiler
+tc-getFC() { tc-getPROG FC gfortran "$@"; }
+# @FUNCTION: tc-getGCJ
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the java compiler
+tc-getGCJ() { tc-getPROG GCJ gcj "$@"; }
+# @FUNCTION: tc-getGO
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the Go compiler
+tc-getGO() { tc-getPROG GO gccgo "$@"; }
+# @FUNCTION: tc-getPKG_CONFIG
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the pkg-config tool
+tc-getPKG_CONFIG() { tc-getPROG PKG_CONFIG pkg-config "$@"; }
+# @FUNCTION: tc-getRC
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the Windows resource compiler
+tc-getRC() { tc-getPROG RC windres "$@"; }
+# @FUNCTION: tc-getDLLWRAP
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the Windows dllwrap utility
+tc-getDLLWRAP() { tc-getPROG DLLWRAP dllwrap "$@"; }
+
+# @FUNCTION: tc-getBUILD_AR
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the archiver for building binaries to run on the build machine
+tc-getBUILD_AR() { tc-getBUILD_PROG AR ar "$@"; }
+# @FUNCTION: tc-getBUILD_AS
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the assembler for building binaries to run on the build machine
+tc-getBUILD_AS() { tc-getBUILD_PROG AS as "$@"; }
+# @FUNCTION: tc-getBUILD_CC
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the C compiler for building binaries to run on the build machine
+tc-getBUILD_CC() { tc-getBUILD_PROG CC gcc "$@"; }
+# @FUNCTION: tc-getBUILD_CPP
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the C preprocessor for building binaries to run on the build machine
+tc-getBUILD_CPP() { tc-getBUILD_PROG CPP "$(tc-getBUILD_CC) -E" "$@"; }
+# @FUNCTION: tc-getBUILD_CXX
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the C++ compiler for building binaries to run on the build machine
+tc-getBUILD_CXX() { tc-getBUILD_PROG CXX g++ "$@"; }
+# @FUNCTION: tc-getBUILD_LD
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the linker for building binaries to run on the build machine
+tc-getBUILD_LD() { tc-getBUILD_PROG LD ld "$@"; }
+# @FUNCTION: tc-getBUILD_STRIP
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the strip program for building binaries to run on the build machine
+tc-getBUILD_STRIP() { tc-getBUILD_PROG STRIP strip "$@"; }
+# @FUNCTION: tc-getBUILD_NM
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the symbol/object thingy for building binaries to run on the build machine
+tc-getBUILD_NM() { tc-getBUILD_PROG NM nm "$@"; }
+# @FUNCTION: tc-getBUILD_RANLIB
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the archiver indexer for building binaries to run on the build machine
+tc-getBUILD_RANLIB() { tc-getBUILD_PROG RANLIB ranlib "$@"; }
+# @FUNCTION: tc-getBUILD_OBJCOPY
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the object copier for building binaries to run on the build machine
+tc-getBUILD_OBJCOPY() { tc-getBUILD_PROG OBJCOPY objcopy "$@"; }
+# @FUNCTION: tc-getBUILD_PKG_CONFIG
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the pkg-config tool for building binaries to run on the build machine
+tc-getBUILD_PKG_CONFIG() { tc-getBUILD_PROG PKG_CONFIG pkg-config "$@"; }
+
+# @FUNCTION: tc-export
+# @USAGE: <list of toolchain variables>
+# @DESCRIPTION:
+# Quick way to export a bunch of compiler vars at once.
+tc-export() {
+	local var
+	for var in "$@" ; do
+		[[ $(type -t "tc-get${var}") != "function" ]] && die "tc-export: invalid export variable '${var}'"
+		"tc-get${var}" > /dev/null
+	done
+}
+
+# @FUNCTION: tc-is-cross-compiler
+# @RETURN: Shell true if we are using a cross-compiler, shell false otherwise
+tc-is-cross-compiler() {
+	[[ ${CBUILD:-${CHOST}} != ${CHOST} ]]
+}
+
+# @FUNCTION: tc-is-softfloat
+# @DESCRIPTION:
+# See if this toolchain is a softfloat based one.
+# @CODE
+# The possible return values:
+#  - only:   the target is always softfloat (never had fpu)
+#  - yes:    the target should support softfloat
+#  - softfp: (arm specific) the target should use hardfloat insns, but softfloat calling convention
+#  - no:     the target doesn't support softfloat
+# @CODE
+# This allows us to react differently where packages accept
+# softfloat flags in the case where support is optional, but
+# rejects softfloat flags where the target always lacks an fpu.
+tc-is-softfloat() {
+	local CTARGET=${CTARGET:-${CHOST}}
+	case ${CTARGET} in
+		bfin*|h8300*)
+			echo "only" ;;
+		*)
+			if [[ ${CTARGET//_/-} == *-softfloat-* ]] ; then
+				echo "yes"
+			elif [[ ${CTARGET//_/-} == *-softfp-* ]] ; then
+				echo "softfp"
+			else
+				echo "no"
+			fi
+			;;
+	esac
+}
+
+# @FUNCTION: tc-is-static-only
+# @DESCRIPTION:
+# Return shell true if the target does not support shared libs, shell false
+# otherwise.
+tc-is-static-only() {
+	local host=${CTARGET:-${CHOST}}
+
+	# *MiNT doesn't have shared libraries, only platform so far
+	[[ ${host} == *-mint* ]]
+}
+
+# @FUNCTION: tc-stack-grows-down
+# @DESCRIPTION:
+# Return shell true if the stack grows down.  This is the default behavior
+# for the vast majority of systems out there and usually projects shouldn't
+# care about such internal details.
+tc-stack-grows-down() {
+	# List the few that grow up.
+	case ${ARCH} in
+	hppa|metag) return 1 ;;
+	esac
+
+	# Assume all others grow down.
+	return 0
+}
+
+# @FUNCTION: tc-export_build_env
+# @USAGE: [compiler variables]
+# @DESCRIPTION:
+# Export common build related compiler settings.
+tc-export_build_env() {
+	tc-export "$@"
+	# Some build envs will initialize vars like:
+	# : ${BUILD_LDFLAGS:-${LDFLAGS}}
+	# So make sure all variables are non-empty. #526734
+	: ${BUILD_CFLAGS:=-O1 -pipe}
+	: ${BUILD_CXXFLAGS:=-O1 -pipe}
+	: ${BUILD_CPPFLAGS:= }
+	: ${BUILD_LDFLAGS:= }
+	export BUILD_{C,CXX,CPP,LD}FLAGS
+
+	# Some packages use XXX_FOR_BUILD.
+	local v
+	for v in BUILD_{C,CXX,CPP,LD}FLAGS ; do
+		export ${v#BUILD_}_FOR_BUILD="${!v}"
+	done
+}
+
+# @FUNCTION: tc-env_build
+# @USAGE: <command> [command args]
+# @INTERNAL
+# @DESCRIPTION:
+# Setup the compile environment to the build tools and then execute the
+# specified command.  We use tc-getBUILD_XX here so that we work with
+# all of the semi-[non-]standard env vars like $BUILD_CC which often
+# the target build system does not check.
+tc-env_build() {
+	tc-export_build_env
+	CFLAGS=${BUILD_CFLAGS} \
+	CXXFLAGS=${BUILD_CXXFLAGS} \
+	CPPFLAGS=${BUILD_CPPFLAGS} \
+	LDFLAGS=${BUILD_LDFLAGS} \
+	AR=$(tc-getBUILD_AR) \
+	AS=$(tc-getBUILD_AS) \
+	CC=$(tc-getBUILD_CC) \
+	CPP=$(tc-getBUILD_CPP) \
+	CXX=$(tc-getBUILD_CXX) \
+	LD=$(tc-getBUILD_LD) \
+	NM=$(tc-getBUILD_NM) \
+	PKG_CONFIG=$(tc-getBUILD_PKG_CONFIG) \
+	RANLIB=$(tc-getBUILD_RANLIB) \
+	"$@"
+}
+
+# @FUNCTION: econf_build
+# @USAGE: [econf flags]
+# @DESCRIPTION:
+# Sometimes we need to locally build up some tools to run on CBUILD because
+# the package has helper utils which are compiled+executed when compiling.
+# This won't work when cross-compiling as the CHOST is set to a target which
+# we cannot natively execute.
+#
+# For example, the python package will build up a local python binary using
+# a portable build system (configure+make), but then use that binary to run
+# local python scripts to build up other components of the overall python.
+# We cannot rely on the python binary in $PATH as that often times will be
+# a different version, or not even installed in the first place.  Instead,
+# we compile the code in a different directory to run on CBUILD, and then
+# use that binary when compiling the main package to run on CHOST.
+#
+# For example, with newer EAPIs, you'd do something like:
+# @CODE
+# src_configure() {
+# 	ECONF_SOURCE=${S}
+# 	if tc-is-cross-compiler ; then
+# 		mkdir "${WORKDIR}"/${CBUILD}
+# 		pushd "${WORKDIR}"/${CBUILD} >/dev/null
+# 		econf_build --disable-some-unused-stuff
+# 		popd >/dev/null
+# 	fi
+# 	... normal build paths ...
+# }
+# src_compile() {
+# 	if tc-is-cross-compiler ; then
+# 		pushd "${WORKDIR}"/${CBUILD} >/dev/null
+# 		emake one-or-two-build-tools
+# 		ln/mv build-tools to normal build paths in ${S}/
+# 		popd >/dev/null
+# 	fi
+# 	... normal build paths ...
+# }
+# @CODE
+econf_build() {
+	local CBUILD=${CBUILD:-${CHOST}}
+	tc-env_build econf --build=${CBUILD} --host=${CBUILD} "$@"
+}
+
+# @FUNCTION: tc-ld-is-gold
+# @USAGE: [toolchain prefix]
+# @DESCRIPTION:
+# Return true if the current linker is set to gold.
+tc-ld-is-gold() {
+	local out
+
+	# First check the linker directly.
+	out=$($(tc-getLD "$@") --version 2>&1)
+	if [[ ${out} == *"GNU gold"* ]] ; then
+		return 0
+	fi
+
+	# Then see if they're selecting gold via compiler flags.
+	# Note: We're assuming they're using LDFLAGS to hold the
+	# options and not CFLAGS/CXXFLAGS.
+	local base="${T}/test-tc-gold"
+	cat <<-EOF > "${base}.c"
+	int main() { return 0; }
+	EOF
+	out=$($(tc-getCC "$@") ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -Wl,--version "${base}.c" -o "${base}" 2>&1)
+	rm -f "${base}"*
+	if [[ ${out} == *"GNU gold"* ]] ; then
+		return 0
+	fi
+
+	# No gold here!
+	return 1
+}
+
+# @FUNCTION: tc-ld-disable-gold
+# @USAGE: [toolchain prefix]
+# @DESCRIPTION:
+# If the gold linker is currently selected, configure the compilation
+# settings so that we use the older bfd linker instead.
+tc-ld-disable-gold() {
+	if ! tc-ld-is-gold "$@" ; then
+		# They aren't using gold, so nothing to do!
+		return
+	fi
+
+	ewarn "Forcing usage of the BFD linker instead of GOLD"
+
+	# Set up LD to point directly to bfd if it's available.
+	# We need to extract the first word in case there are flags appended
+	# to its value (like multilib).  #545218
+	local ld=$(tc-getLD "$@")
+	local bfd_ld="${ld%% *}.bfd"
+	local path_ld=$(which "${bfd_ld}" 2>/dev/null)
+	[[ -e ${path_ld} ]] && export LD=${bfd_ld}
+
+	# Set up LDFLAGS to select gold based on the gcc version.
+	local major=$(gcc-major-version "$@")
+	local minor=$(gcc-minor-version "$@")
+	if [[ ${major} -lt 4 ]] || [[ ${major} -eq 4 && ${minor} -lt 8 ]] ; then
+		# <=gcc-4.7 requires some coercion.  Only works if bfd exists.
+		if [[ -e ${path_ld} ]] ; then
+			local d="${T}/bfd-linker"
+			mkdir -p "${d}"
+			ln -sf "${path_ld}" "${d}"/ld
+			export LDFLAGS="${LDFLAGS} -B${d}"
+		else
+			die "unable to locate a BFD linker to bypass gold"
+		fi
+	else
+		# gcc-4.8+ supports -fuse-ld directly.
+		export LDFLAGS="${LDFLAGS} -fuse-ld=bfd"
+	fi
+}
+
+# @FUNCTION: tc-has-openmp
+# @USAGE: [toolchain prefix]
+# @DESCRIPTION:
+# See if the toolchain supports OpenMP.
+tc-has-openmp() {
+	local base="${T}/test-tc-openmp"
+	cat <<-EOF > "${base}.c"
+	#include <omp.h>
+	int main() {
+		int nthreads, tid, ret = 0;
+		#pragma omp parallel private(nthreads, tid)
+		{
+		tid = omp_get_thread_num();
+		nthreads = omp_get_num_threads(); ret += tid + nthreads;
+		}
+		return ret;
+	}
+	EOF
+	$(tc-getCC "$@") -fopenmp "${base}.c" -o "${base}" >&/dev/null
+	local ret=$?
+	rm -f "${base}"*
+	return ${ret}
+}
+
+# @FUNCTION: tc-check-openmp
+# @DESCRIPTION:
+# Test for OpenMP support with the current compiler and error out with
+# a clear error message, telling the user how to rectify the missing
+# OpenMP support that has been requested by the ebuild. Using this function
+# to test for OpenMP support should be preferred over tc-has-openmp and
+# printing a custom message, as it presents a uniform interface to the user.
+tc-check-openmp() {
+	if ! tc-has-openmp; then
+		eerror "Your current compiler does not support OpenMP!"
+
+		if tc-is-gcc; then
+			eerror "Enable OpenMP support by building sys-devel/gcc with USE=\"openmp\"."
+		elif tc-is-clang; then
+			eerror "OpenMP support in sys-devel/clang is provided by sys-libs/libomp."
+		fi
+
+		die "Active compiler does not have required support for OpenMP"
+	fi
+}
+
+# @FUNCTION: tc-has-tls
+# @USAGE: [-s|-c|-l] [toolchain prefix]
+# @DESCRIPTION:
+# See if the toolchain supports thread local storage (TLS).  Use -s to test the
+# compiler, -c to also test the assembler, and -l to also test the C library
+# (the default).
+tc-has-tls() {
+	local base="${T}/test-tc-tls"
+	cat <<-EOF > "${base}.c"
+	int foo(int *i) {
+		static __thread int j = 0;
+		return *i ? j : *i;
+	}
+	EOF
+	local flags
+	case $1 in
+		-s) flags="-S";;
+		-c) flags="-c";;
+		-l) ;;
+		-*) die "Usage: tc-has-tls [-c|-l] [toolchain prefix]";;
+	esac
+	: ${flags:=-fPIC -shared -Wl,-z,defs}
+	[[ $1 == -* ]] && shift
+	$(tc-getCC "$@") ${flags} "${base}.c" -o "${base}" >&/dev/null
+	local ret=$?
+	rm -f "${base}"*
+	return ${ret}
+}
+
+
+# Parse information from CBUILD/CHOST/CTARGET rather than
+# use external variables from the profile.
+tc-ninja_magic_to_arch() {
+ninj() { [[ ${type} == "kern" ]] && echo $1 || echo $2 ; }
+
+	local type=$1
+	local host=$2
+	[[ -z ${host} ]] && host=${CTARGET:-${CHOST}}
+
+	case ${host} in
+		aarch64*)	echo arm64;;
+		alpha*)		echo alpha;;
+		arm*)		echo arm;;
+		avr*)		ninj avr32 avr;;
+		bfin*)		ninj blackfin bfin;;
+		c6x*)		echo c6x;;
+		cris*)		echo cris;;
+		frv*)		echo frv;;
+		hexagon*)	echo hexagon;;
+		hppa*)		ninj parisc hppa;;
+		i?86*)
+			# Starting with linux-2.6.24, the 'x86_64' and 'i386'
+			# trees have been unified into 'x86'.
+			# FreeBSD still uses i386
+			if [[ ${type} == "kern" && ${host} == *freebsd* ]] ; then
+				echo i386
+			else
+				echo x86
+			fi
+			;;
+		ia64*)		echo ia64;;
+		m68*)		echo m68k;;
+		metag*)		echo metag;;
+		microblaze*)	echo microblaze;;
+		mips*)		echo mips;;
+		nios2*)		echo nios2;;
+		nios*)		echo nios;;
+		or1k|or32*)	echo openrisc;;
+		powerpc*)
+			# Starting with linux-2.6.15, the 'ppc' and 'ppc64' trees
+			# have been unified into simply 'powerpc', but until 2.6.16,
+			# ppc32 is still using ARCH="ppc" as default
+			if [[ ${type} == "kern" ]] ; then
+				echo powerpc
+			elif [[ ${host} == powerpc64* ]] ; then
+				echo ppc64
+			else
+				echo ppc
+			fi
+			;;
+		riscv*)		echo riscv;;
+		s390*)		echo s390;;
+		score*)		echo score;;
+		sh64*)		ninj sh64 sh;;
+		sh*)		echo sh;;
+		sparc64*)	ninj sparc64 sparc;;
+		sparc*)		[[ ${PROFILE_ARCH} == "sparc64" ]] \
+						&& ninj sparc64 sparc \
+						|| echo sparc
+					;;
+		tile*)		echo tile;;
+		vax*)		echo vax;;
+		x86_64*freebsd*) echo amd64;;
+		x86_64*)
+			# Starting with linux-2.6.24, the 'x86_64' and 'i386'
+			# trees have been unified into 'x86'.
+			if [[ ${type} == "kern" ]] ; then
+				echo x86
+			else
+				echo amd64
+			fi
+			;;
+		xtensa*)	echo xtensa;;
+
+		# since our usage of tc-arch is largely concerned with
+		# normalizing inputs for testing ${CTARGET}, let's filter
+		# other cross targets (mingw and such) into the unknown.
+		*)			echo unknown;;
+	esac
+}
+# @FUNCTION: tc-arch-kernel
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the kernel arch according to the compiler target
+tc-arch-kernel() {
+	tc-ninja_magic_to_arch kern "$@"
+}
+# @FUNCTION: tc-arch
+# @USAGE: [toolchain prefix]
+# @RETURN: name of the portage arch according to the compiler target
+tc-arch() {
+	tc-ninja_magic_to_arch portage "$@"
+}
+
+tc-endian() {
+	local host=$1
+	[[ -z ${host} ]] && host=${CTARGET:-${CHOST}}
+	host=${host%%-*}
+
+	case ${host} in
+		aarch64*be)	echo big;;
+		aarch64)	echo little;;
+		alpha*)		echo little;;
+		arm*b*)		echo big;;
+		arm*)		echo little;;
+		cris*)		echo little;;
+		hppa*)		echo big;;
+		i?86*)		echo little;;
+		ia64*)		echo little;;
+		m68*)		echo big;;
+		mips*l*)	echo little;;
+		mips*)		echo big;;
+		powerpc*le)	echo little;;
+		powerpc*)	echo big;;
+		s390*)		echo big;;
+		sh*b*)		echo big;;
+		sh*)		echo little;;
+		sparc*)		echo big;;
+		x86_64*)	echo little;;
+		*)			echo wtf;;
+	esac
+}
+
+# @FUNCTION: tc-get-compiler-type
+# @RETURN: keyword identifying the compiler: gcc, clang, pathcc, unknown
+tc-get-compiler-type() {
+	local code='
+#if defined(__PATHSCALE__)
+	HAVE_PATHCC
+#elif defined(__clang__)
+	HAVE_CLANG
+#elif defined(__GNUC__)
+	HAVE_GCC
+#endif
+'
+	local res=$($(tc-getCPP "$@") -E -P - <<<"${code}")
+
+	case ${res} in
+		*HAVE_PATHCC*)	echo pathcc;;
+		*HAVE_CLANG*)	echo clang;;
+		*HAVE_GCC*)		echo gcc;;
+		*)				echo unknown;;
+	esac
+}
+
+# @FUNCTION: tc-is-gcc
+# @RETURN: Shell true if the current compiler is GCC, false otherwise.
+tc-is-gcc() {
+	[[ $(tc-get-compiler-type) == gcc ]]
+}
+
+# @FUNCTION: tc-is-clang
+# @RETURN: Shell true if the current compiler is clang, false otherwise.
+tc-is-clang() {
+	[[ $(tc-get-compiler-type) == clang ]]
+}
+
+# Internal func.  The first argument is the version info to expand.
+# Query the preprocessor to improve compatibility across different
+# compilers rather than maintaining a --version flag matrix. #335943
+_gcc_fullversion() {
+	local ver="$1"; shift
+	set -- $($(tc-getCPP "$@") -E -P - <<<"__GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__")
+	eval echo "$ver"
+}
+
+# @FUNCTION: gcc-fullversion
+# @RETURN: compiler version (major.minor.micro: [3.4.6])
+gcc-fullversion() {
+	_gcc_fullversion '$1.$2.$3' "$@"
+}
+# @FUNCTION: gcc-version
+# @RETURN: compiler version (major.minor: [3.4].6)
+gcc-version() {
+	_gcc_fullversion '$1.$2' "$@"
+}
+# @FUNCTION: gcc-major-version
+# @RETURN: major compiler version (major: [3].4.6)
+gcc-major-version() {
+	_gcc_fullversion '$1' "$@"
+}
+# @FUNCTION: gcc-minor-version
+# @RETURN: minor compiler version (minor: 3.[4].6)
+gcc-minor-version() {
+	_gcc_fullversion '$2' "$@"
+}
+# @FUNCTION: gcc-micro-version
+# @RETURN: micro compiler version (micro: 3.4.[6])
+gcc-micro-version() {
+	_gcc_fullversion '$3' "$@"
+}
+
+# Internal func. Based on _gcc_fullversion() above.
+_clang_fullversion() {
+	local ver="$1"; shift
+	set -- $($(tc-getCPP "$@") -E -P - <<<"__clang_major__ __clang_minor__ __clang_patchlevel__")
+	eval echo "$ver"
+}
+
+# @FUNCTION: clang-fullversion
+# @RETURN: compiler version (major.minor.micro: [3.4.6])
+clang-fullversion() {
+	_clang_fullversion '$1.$2.$3' "$@"
+}
+# @FUNCTION: clang-version
+# @RETURN: compiler version (major.minor: [3.4].6)
+clang-version() {
+	_clang_fullversion '$1.$2' "$@"
+}
+# @FUNCTION: clang-major-version
+# @RETURN: major compiler version (major: [3].4.6)
+clang-major-version() {
+	_clang_fullversion '$1' "$@"
+}
+# @FUNCTION: clang-minor-version
+# @RETURN: minor compiler version (minor: 3.[4].6)
+clang-minor-version() {
+	_clang_fullversion '$2' "$@"
+}
+# @FUNCTION: clang-micro-version
+# @RETURN: micro compiler version (micro: 3.4.[6])
+clang-micro-version() {
+	_clang_fullversion '$3' "$@"
+}
+
+# Returns the installation directory - internal toolchain
+# function for use by _gcc-specs-exists (for flag-o-matic).
+_gcc-install-dir() {
+	echo "$(LC_ALL=C $(tc-getCC) -print-search-dirs 2> /dev/null |\
+		awk '$1=="install:" {print $2}')"
+}
+# Returns true if the indicated specs file exists - internal toolchain
+# function for use by flag-o-matic.
+_gcc-specs-exists() {
+	[[ -f $(_gcc-install-dir)/$1 ]]
+}
+
+# Returns requested gcc specs directive unprocessed - for used by
+# gcc-specs-directive()
+# Note; later specs normally overwrite earlier ones; however if a later
+# spec starts with '+' then it appends.
+# gcc -dumpspecs is parsed first, followed by files listed by "gcc -v"
+# as "Reading <file>", in order.  Strictly speaking, if there's a
+# $(gcc_install_dir)/specs, the built-in specs aren't read, however by
+# the same token anything from 'gcc -dumpspecs' is overridden by
+# the contents of $(gcc_install_dir)/specs so the result is the
+# same either way.
+_gcc-specs-directive_raw() {
+	local cc=$(tc-getCC)
+	local specfiles=$(LC_ALL=C ${cc} -v 2>&1 | awk '$1=="Reading" {print $NF}')
+	${cc} -dumpspecs 2> /dev/null | cat - ${specfiles} | awk -v directive=$1 \
+'BEGIN	{ pspec=""; spec=""; outside=1 }
+$1=="*"directive":"  { pspec=spec; spec=""; outside=0; next }
+	outside || NF==0 || ( substr($1,1,1)=="*" && substr($1,length($1),1)==":" ) { outside=1; next }
+	spec=="" && substr($0,1,1)=="+" { spec=pspec " " substr($0,2); next }
+	{ spec=spec $0 }
+END	{ print spec }'
+	return 0
+}
+
+# Return the requested gcc specs directive, with all included
+# specs expanded.
+# Note, it does not check for inclusion loops, which cause it
+# to never finish - but such loops are invalid for gcc and we're
+# assuming gcc is operational.
+gcc-specs-directive() {
+	local directive subdname subdirective
+	directive="$(_gcc-specs-directive_raw $1)"
+	while [[ ${directive} == *%\(*\)* ]]; do
+		subdname=${directive/*%\(}
+		subdname=${subdname/\)*}
+		subdirective="$(_gcc-specs-directive_raw ${subdname})"
+		directive="${directive//\%(${subdname})/${subdirective}}"
+	done
+	echo "${directive}"
+	return 0
+}
+
+# Returns true if gcc sets relro
+gcc-specs-relro() {
+	local directive
+	directive=$(gcc-specs-directive link_command)
+	[[ "${directive/\{!norelro:}" != "${directive}" ]]
+}
+# Returns true if gcc sets now
+gcc-specs-now() {
+	local directive
+	directive=$(gcc-specs-directive link_command)
+	[[ "${directive/\{!nonow:}" != "${directive}" ]]
+}
+# Returns true if gcc builds PIEs
+gcc-specs-pie() {
+	local directive
+	directive=$(gcc-specs-directive cc1)
+	[[ "${directive/\{!nopie:}" != "${directive}" ]]
+}
+# Returns true if gcc builds with the stack protector
+gcc-specs-ssp() {
+	local directive
+	directive=$(gcc-specs-directive cc1)
+	[[ "${directive/\{!fno-stack-protector:}" != "${directive}" ]]
+}
+# Returns true if gcc upgrades fstack-protector to fstack-protector-all
+gcc-specs-ssp-to-all() {
+	local directive
+	directive=$(gcc-specs-directive cc1)
+	[[ "${directive/\{!fno-stack-protector-all:}" != "${directive}" ]]
+}
+# Returns true if gcc builds with fno-strict-overflow
+gcc-specs-nostrict() {
+	local directive
+	directive=$(gcc-specs-directive cc1)
+	[[ "${directive/\{!fstrict-overflow:}" != "${directive}" ]]
+}
+# Returns true if gcc builds with fstack-check
+gcc-specs-stack-check() {
+	local directive
+	directive=$(gcc-specs-directive cc1)
+	[[ "${directive/\{!fno-stack-check:}" != "${directive}" ]]
+}
+
+
+# @FUNCTION: tc-enables-pie
+# @RETURN: Truth if the current compiler generates position-independent code (PIC) which can be linked into executables
+# @DESCRIPTION:
+# Return truth if the current compiler generates position-independent code (PIC)
+# which can be linked into executables.
+tc-enables-pie() {
+	local ret="$($(tc-getCC) ${CPPFLAGS} ${CFLAGS} -E -P - <<-EOF 2> /dev/null | grep '^true$'
+		#if defined(__PIE__)
+		true
+		#endif
+		EOF
+	)"
+	[[ ${ret} == true ]]
+}
+
+# @FUNCTION: tc-enables-ssp
+# @RETURN: Truth if the current compiler enables stack smashing protection (SSP) on at least minimal level
+# @DESCRIPTION:
+# Return truth if the current compiler enables stack smashing protection (SSP)
+# on level corresponding to any of the following options:
+#  -fstack-protector
+#  -fstack-protector-strong
+#  -fstack-protector-all
+tc-enables-ssp() {
+	local ret="$($(tc-getCC) ${CPPFLAGS} ${CFLAGS} -E -P - <<-EOF 2> /dev/null | grep '^true$'
+		#if defined(__SSP__) || defined(__SSP_STRONG__) || defined(__SSP_ALL__)
+		true
+		#endif
+		EOF
+	)"
+	[[ ${ret} == true ]]
+}
+
+# @FUNCTION: tc-enables-ssp-strong
+# @RETURN: Truth if the current compiler enables stack smashing protection (SSP) on at least middle level
+# @DESCRIPTION:
+# Return truth if the current compiler enables stack smashing protection (SSP)
+# on level corresponding to any of the following options:
+#  -fstack-protector-strong
+#  -fstack-protector-all
+tc-enables-ssp-strong() {
+	local ret="$($(tc-getCC) ${CPPFLAGS} ${CFLAGS} -E -P - <<-EOF 2> /dev/null | grep '^true$'
+		#if defined(__SSP_STRONG__) || defined(__SSP_ALL__)
+		true
+		#endif
+		EOF
+	)"
+	[[ ${ret} == true ]]
+}
+
+# @FUNCTION: tc-enables-ssp-all
+# @RETURN: Truth if the current compiler enables stack smashing protection (SSP) on maximal level
+# @DESCRIPTION:
+# Return truth if the current compiler enables stack smashing protection (SSP)
+# on level corresponding to any of the following options:
+#  -fstack-protector-all
+tc-enables-ssp-all() {
+	local ret="$($(tc-getCC) ${CPPFLAGS} ${CFLAGS} -E -P - <<-EOF 2> /dev/null | grep '^true$'
+		#if defined(__SSP_ALL__)
+		true
+		#endif
+		EOF
+	)"
+	[[ ${ret} == true ]]
+}
+
+
+# @FUNCTION: gen_usr_ldscript
+# @USAGE: [-a] <list of libs to create linker scripts for>
+# @DESCRIPTION:
+# This function generate linker scripts in /usr/lib for dynamic
+# libs in /lib.  This is to fix linking problems when you have
+# the .so in /lib, and the .a in /usr/lib.  What happens is that
+# in some cases when linking dynamic, the .a in /usr/lib is used
+# instead of the .so in /lib due to gcc/libtool tweaking ld's
+# library search path.  This causes many builds to fail.
+# See bug #4411 for more info.
+#
+# Note that you should in general use the unversioned name of
+# the library (libfoo.so), as ldconfig should usually update it
+# correctly to point to the latest version of the library present.
+gen_usr_ldscript() {
+	local lib libdir=$(get_libdir) output_format="" auto=false suffix=$(get_libname)
+	[[ -z ${ED+set} ]] && local ED=${D%/}${EPREFIX}/
+
+	tc-is-static-only && return
+
+	# We only care about stuffing / for the native ABI. #479448
+	if [[ $(type -t multilib_is_native_abi) == "function" ]] ; then
+		multilib_is_native_abi || return 0
+	fi
+
+	# Eventually we'd like to get rid of this func completely #417451
+	case ${CTARGET:-${CHOST}} in
+	*-darwin*) ;;
+	*-android*) return 0 ;;
+	*linux*|*-freebsd*|*-openbsd*|*-netbsd*)
+		use prefix && return 0 ;;
+	*) return 0 ;;
+	esac
+
+	# Just make sure it exists
+	dodir /usr/${libdir}
+
+	if [[ $1 == "-a" ]] ; then
+		auto=true
+		shift
+		dodir /${libdir}
+	fi
+
+	# OUTPUT_FORMAT gives hints to the linker as to what binary format
+	# is referenced ... makes multilib saner
+	local flags=( ${CFLAGS} ${LDFLAGS} -Wl,--verbose )
+	if $(tc-getLD) --version | grep -q 'GNU gold' ; then
+		# If they're using gold, manually invoke the old bfd. #487696
+		local d="${T}/bfd-linker"
+		mkdir -p "${d}"
+		ln -sf $(which ${CHOST}-ld.bfd) "${d}"/ld
+		flags+=( -B"${d}" )
+	fi
+	output_format=$($(tc-getCC) "${flags[@]}" 2>&1 | sed -n 's/^OUTPUT_FORMAT("\([^"]*\)",.*/\1/p')
+	[[ -n ${output_format} ]] && output_format="OUTPUT_FORMAT ( ${output_format} )"
+
+	for lib in "$@" ; do
+		local tlib
+		if ${auto} ; then
+			lib="lib${lib}${suffix}"
+		else
+			# Ensure /lib/${lib} exists to avoid dangling scripts/symlinks.
+			# This especially is for AIX where $(get_libname) can return ".a",
+			# so /lib/${lib} might be moved to /usr/lib/${lib} (by accident).
+			[[ -r ${ED}/${libdir}/${lib} ]] || continue
+			#TODO: better die here?
+		fi
+
+		case ${CTARGET:-${CHOST}} in
+		*-darwin*)
+			if ${auto} ; then
+				tlib=$(scanmacho -qF'%S#F' "${ED}"/usr/${libdir}/${lib})
+			else
+				tlib=$(scanmacho -qF'%S#F' "${ED}"/${libdir}/${lib})
+			fi
+			[[ -z ${tlib} ]] && die "unable to read install_name from ${lib}"
+			tlib=${tlib##*/}
+
+			if ${auto} ; then
+				mv "${ED}"/usr/${libdir}/${lib%${suffix}}.*${suffix#.} "${ED}"/${libdir}/ || die
+				# some install_names are funky: they encode a version
+				if [[ ${tlib} != ${lib%${suffix}}.*${suffix#.} ]] ; then
+					mv "${ED}"/usr/${libdir}/${tlib%${suffix}}.*${suffix#.} "${ED}"/${libdir}/ || die
+				fi
+				rm -f "${ED}"/${libdir}/${lib}
+			fi
+
+			# Mach-O files have an id, which is like a soname, it tells how
+			# another object linking against this lib should reference it.
+			# Since we moved the lib from usr/lib into lib this reference is
+			# wrong.  Hence, we update it here.  We don't configure with
+			# libdir=/lib because that messes up libtool files.
+			# Make sure we don't lose the specific version, so just modify the
+			# existing install_name
+			if [[ ! -w "${ED}/${libdir}/${tlib}" ]] ; then
+				chmod u+w "${ED}${libdir}/${tlib}" # needed to write to it
+				local nowrite=yes
+			fi
+			install_name_tool \
+				-id "${EPREFIX}"/${libdir}/${tlib} \
+				"${ED}"/${libdir}/${tlib} || die "install_name_tool failed"
+			[[ -n ${nowrite} ]] && chmod u-w "${ED}${libdir}/${tlib}"
+			# Now as we don't use GNU binutils and our linker doesn't
+			# understand linker scripts, just create a symlink.
+			pushd "${ED}/usr/${libdir}" > /dev/null
+			ln -snf "../../${libdir}/${tlib}" "${lib}"
+			popd > /dev/null
+			;;
+		*)
+			if ${auto} ; then
+				tlib=$(scanelf -qF'%S#F' "${ED}"/usr/${libdir}/${lib})
+				[[ -z ${tlib} ]] && die "unable to read SONAME from ${lib}"
+				mv "${ED}"/usr/${libdir}/${lib}* "${ED}"/${libdir}/ || die
+				# some SONAMEs are funky: they encode a version before the .so
+				if [[ ${tlib} != ${lib}* ]] ; then
+					mv "${ED}"/usr/${libdir}/${tlib}* "${ED}"/${libdir}/ || die
+				fi
+				rm -f "${ED}"/${libdir}/${lib}
+			else
+				tlib=${lib}
+			fi
+			cat > "${ED}/usr/${libdir}/${lib}" <<-END_LDSCRIPT
+			/* GNU ld script
+			   Since Gentoo has critical dynamic libraries in /lib, and the static versions
+			   in /usr/lib, we need to have a "fake" dynamic lib in /usr/lib, otherwise we
+			   run into linking problems.  This "fake" dynamic lib is a linker script that
+			   redirects the linker to the real lib.  And yes, this works in the cross-
+			   compiling scenario as the sysroot-ed linker will prepend the real path.
+
+			   See bug https://bugs.gentoo.org/4411 for more info.
+			 */
+			${output_format}
+			GROUP ( ${EPREFIX}/${libdir}/${tlib} )
+			END_LDSCRIPT
+			;;
+		esac
+		fperms a+x "/usr/${libdir}/${lib}" || die "could not change perms on ${lib}"
+	done
+}
+
+fi