eclass/flag-o-matic.eclass - mirrors/cros/chromiumos/overlays/portage-stable - Git at Google

 # Copyright 1999-2014 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.205 2015/05/06 07:04:53 vapier Exp $

 # @ECLASS: flag-o-matic.eclass
 # @MAINTAINER:
 # toolchain@gentoo.org
 # @BLURB: common functions to manipulate and query toolchain flags
 # @DESCRIPTION:
 # This eclass contains a suite of functions to help developers sanely
 # and safely manage toolchain flags in their builds.

 if [[ -z ${_FLAG_O_MATIC_ECLASS} ]]; then
 _FLAG_O_MATIC_ECLASS=1

 inherit eutils toolchain-funcs multilib

 # Return all the flag variables that our high level funcs operate on.
 all-flag-vars() {
 	echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
 }

 # {C,CPP,CXX,CCAS,F,FC,LD}FLAGS that we allow in strip-flags
 # Note: shell globs and character lists are allowed
 setup-allowed-flags() {
 	ALLOWED_FLAGS="-pipe"
 	ALLOWED_FLAGS+=" -O -O1 -O2 -Os -Og -mcpu -march -mtune"
 	ALLOWED_FLAGS+=" -fstack-protector* -fsanitize=*"
 	ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
 	ALLOWED_FLAGS+=" -fno-PIE -fno-pie -nopie -fno-unit-at-a-time"
 	ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gdwarf-* gstabs -gstabs+"
 	ALLOWED_FLAGS+=" -fno-ident -fpermissive -frecord-gcc-switches"
 	ALLOWED_FLAGS+=" -fdiagnostics*"
 	ALLOWED_FLAGS+=" -W* -w"

 	# allow a bunch of flags that negate features / control ABI
 	ALLOWED_FLAGS+=" -fno-stack-protector* -fabi-version=* \
 		-fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
 		-fno-omit-frame-pointer -fno-builtin*"
 	ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
 		-mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
 		-mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
 		-mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
 		-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
 		-mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
 		-mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
 		-mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
 		-mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
 		-mstack-bias -mno-stack-bias -msecure-plt -m*-toc -mfloat-abi \
 		-mfix-r10000 -mno-fix-r10000 -D* -U*"

 	# 4.5
 	ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
 	# 4.6
 	ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
 	# 4.7
 	ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
 	# 4.8
 	ALLOWED_FLAGS+=" -mno-fxsr -mno-rtm -mno-xsave -mno-xsaveopt"
 	# 4.9
 	ALLOWED_FLAGS+=" -mno-avx512cd -mno-avx512er -mno-avx512f -mno-avx512pf -mno-sha"

 	# CPPFLAGS and LDFLAGS
 	ALLOWED_FLAGS+=" -I* -L* -R* -Wl,*"

 	export ALLOWED_FLAGS
 	return 0
 }

 # inverted filters for hardened compiler.  This is trying to unpick
 # the hardened compiler defaults.
 _filter-hardened() {
 	local f
 	for f in "$@" ; do
 		case "${f}" in
 			# Ideally we should only concern ourselves with PIE flags,
 			# not -fPIC or -fpic, but too many places filter -fPIC without
 			# thinking about -fPIE.
 			-fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
 				gcc-specs-pie || continue
 				is-flagq -nopie || append-flags -nopie;;
 			-fstack-protector)
 				gcc-specs-ssp || continue
 				is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
 			-fstack-protector-all)
 				gcc-specs-ssp-to-all || continue
 				is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
 			-fno-strict-overflow)
 				gcc-specs-nostrict || continue
 				is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
 		esac
 	done
 }

 # Remove occurrences of strings from variable given in $1
 # Strings removed are matched as globs, so for example
 # '-O*' would remove -O1, -O2 etc.
 _filter-var() {
 	local f x var=$1 new=()
 	shift

 	for f in ${!var} ; do
 		for x in "$@" ; do
 			# Note this should work with globs like -O*
 			[[ ${f} == ${x} ]] && continue 2
 		done
 		new+=( "${f}" )
 	done
 	eval export ${var}=\""${new[*]}"\"
 }

 # @FUNCTION: filter-flags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS.  Accepts shell globs.
 filter-flags() {
 	_filter-hardened "$@"
 	local v
 	for v in $(all-flag-vars) ; do
 		_filter-var ${v} "$@"
 	done
 	return 0
 }

 # @FUNCTION: filter-lfs-flags
 # @DESCRIPTION:
 # Remove flags that enable Large File Support.
 filter-lfs-flags() {
 	[[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
 	# http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
 	# _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
 	# _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
 	# _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
 	filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
 }

 # @FUNCTION: filter-ldflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Remove particular <flags> from LDFLAGS.  Accepts shell globs.
 filter-ldflags() {
 	_filter-var LDFLAGS "$@"
 	return 0
 }

 # @FUNCTION: append-cppflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to the current CPPFLAGS.
 append-cppflags() {
 	[[ $# -eq 0 ]] && return 0
 	export CPPFLAGS+=" $*"
 	return 0
 }

 # @FUNCTION: append-cflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to the current CFLAGS.  If a flag might not be supported
 # with different compilers (or versions), then use test-flags-CC like so:
 # @CODE
 # append-cflags $(test-flags-CC -funky-flag)
 # @CODE
 append-cflags() {
 	[[ $# -eq 0 ]] && return 0
 	# Do not do automatic flag testing ourselves. #417047
 	export CFLAGS+=" $*"
 	return 0
 }

 # @FUNCTION: append-cxxflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to the current CXXFLAGS.  If a flag might not be supported
 # with different compilers (or versions), then use test-flags-CXX like so:
 # @CODE
 # append-cxxflags $(test-flags-CXX -funky-flag)
 # @CODE
 append-cxxflags() {
 	[[ $# -eq 0 ]] && return 0
 	# Do not do automatic flag testing ourselves. #417047
 	export CXXFLAGS+=" $*"
 	return 0
 }

 # @FUNCTION: append-fflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to the current {F,FC}FLAGS.  If a flag might not be supported
 # with different compilers (or versions), then use test-flags-F77 like so:
 # @CODE
 # append-fflags $(test-flags-F77 -funky-flag)
 # @CODE
 append-fflags() {
 	[[ $# -eq 0 ]] && return 0
 	# Do not do automatic flag testing ourselves. #417047
 	export FFLAGS+=" $*"
 	export FCFLAGS+=" $*"
 	return 0
 }

 # @FUNCTION: append-lfs-flags
 # @DESCRIPTION:
 # Add flags that enable Large File Support.
 append-lfs-flags() {
 	[[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
 	# see comments in filter-lfs-flags func for meaning of these
 	append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
 }

 # @FUNCTION: append-ldflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to the current LDFLAGS.
 append-ldflags() {
 	[[ $# -eq 0 ]] && return 0
 	local flag
 	for flag in "$@"; do
 		[[ ${flag} == -l* ]] && \
 			eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
 	done

 	export LDFLAGS="${LDFLAGS} $*"
 	return 0
 }

 # @FUNCTION: append-flags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
 append-flags() {
 	[[ $# -eq 0 ]] && return 0
 	case " $* " in
 	*' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
 	*' '-L*|\
 	*' '-Wl,*)  eqawarn 'please use append-ldflags for linker flags' ;;
 	esac
 	append-cflags "$@"
 	append-cxxflags "$@"
 	append-fflags "$@"
 	return 0
 }

 # @FUNCTION: replace-flags
 # @USAGE: <old> <new>
 # @DESCRIPTION:
 # Replace the <old> flag with <new>.  Accepts shell globs for <old>.
 replace-flags() {
 	[[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"

 	local f var new
 	for var in $(all-flag-vars) ; do
 		# Looping over the flags instead of using a global
 		# substitution ensures that we're working with flag atoms.
 		# Otherwise globs like -O* have the potential to wipe out the
 		# list of flags.
 		new=()
 		for f in ${!var} ; do
 			# Note this should work with globs like -O*
 			[[ ${f} == ${1} ]] && f=${2}
 			new+=( "${f}" )
 		done
 		eval export ${var}=\""${new[*]}"\"
 	done

 	return 0
 }

 # @FUNCTION: replace-cpu-flags
 # @USAGE: <old> <new>
 # @DESCRIPTION:
 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
 # with flags that select the <new> cpu.  Accepts shell globs for <old>.
 replace-cpu-flags() {
 	local newcpu="$#" ; newcpu="${!newcpu}"
 	while [ $# -gt 1 ] ; do
 		# quote to make sure that no globbing is done (particularly on
 		# ${oldcpu}) prior to calling replace-flags
 		replace-flags "-march=${1}" "-march=${newcpu}"
 		replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
 		replace-flags "-mtune=${1}" "-mtune=${newcpu}"
 		shift
 	done
 	return 0
 }

 _is_flagq() {
 	local x var
 	eval var=\""\${$1[*]}"\"
 	for x in ${var} ; do
 		[[ ${x} == $2 ]] && return 0
 	done
 	return 1
 }

 # @FUNCTION: is-flagq
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false.  Accepts shell globs.
 is-flagq() {
 	[[ -n $2 ]] && die "Usage: is-flag <flag>"

 	local var
 	for var in $(all-flag-vars) ; do
 		_is_flagq ${var} "$1" && return 0
 	done
 	return 1
 }

 # @FUNCTION: is-flag
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS.  Accepts shell globs.
 is-flag() {
 	is-flagq "$@" && echo true
 }

 # @FUNCTION: is-ldflagq
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Returns shell true if <flag> is in LDFLAGS, else returns shell false.  Accepts shell globs.
 is-ldflagq() {
 	[[ -n $2 ]] && die "Usage: is-ldflag <flag>"
 	_is_flagq LDFLAGS $1
 }

 # @FUNCTION: is-ldflag
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Echo's "true" if flag is set in LDFLAGS.  Accepts shell globs.
 is-ldflag() {
 	is-ldflagq "$@" && echo true
 }

 # @FUNCTION: filter-mfpmath
 # @USAGE: <math types>
 # @DESCRIPTION:
 # Remove specified math types from the fpmath flag.  For example, if the user
 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
 # -mfpmath=386.
 filter-mfpmath() {
 	local orig_mfpmath new_math prune_math

 	# save the original -mfpmath flag
 	orig_mfpmath=$(get-flag -mfpmath)
 	# get the value of the current -mfpmath flag
 	new_math=$(get-flag mfpmath)
 	# convert "both" to something we can filter
 	new_math=${new_math/both/387,sse}
 	new_math=" ${new_math//[,+]/ } "
 	# figure out which math values are to be removed
 	prune_math=""
 	for prune_math in "$@" ; do
 		new_math=${new_math/ ${prune_math} / }
 	done
 	new_math=$(echo ${new_math})
 	new_math=${new_math// /,}

 	if [[ -z ${new_math} ]] ; then
 		# if we're removing all user specified math values are
 		# slated for removal, then we just filter the flag
 		filter-flags ${orig_mfpmath}
 	else
 		# if we only want to filter some of the user specified
 		# math values, then we replace the current flag
 		replace-flags ${orig_mfpmath} -mfpmath=${new_math}
 	fi
 	return 0
 }

 # @FUNCTION: strip-flags
 # @DESCRIPTION:
 # Strip *FLAGS of everything except known good/safe flags.  This runs over all
 # flags returned by all_flag_vars().
 strip-flags() {
 	local x y var

 	setup-allowed-flags

 	set -f	# disable pathname expansion

 	for var in $(all-flag-vars) ; do
 		local new=()

 		for x in ${!var} ; do
 			local flag=${x%%=*}
 			for y in ${ALLOWED_FLAGS} ; do
 				if [[ -z ${flag%%${y}} ]] ; then
 					new+=( "${x}" )
 					break
 				fi
 			done
 		done

 		# In case we filtered out all optimization flags fallback to -O2
 		if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
 			new+=( -O2 )
 		fi

 		if [[ ${!var} != "${new[*]}" ]] ; then
 			einfo "strip-flags: ${var}: changed '${!var}' to '${new[*]}'"
 		fi
 		eval export ${var}=\""${new[*]}"\"
 	done

 	set +f	# re-enable pathname expansion

 	return 0
 }

 test-flag-PROG() {
 	local comp=$1
 	local lang=$2
 	local flag=$3

 	[[ -z ${comp} || -z ${flag} ]] && return 1

 	local cmdline=(
 		$(tc-get${comp})
 		# Clang will warn about unknown gcc flags but exit 0.
 		# Need -Werror to force it to exit non-zero.
 		-Werror
 		# Use -c so we can test the assembler as well.
 		-c -o /dev/null
 	)
 	if "${cmdline[@]}" -x${lang} - </dev/null >/dev/null 2>&1 ; then
 		"${cmdline[@]}" "${flag}" -x${lang} - </dev/null >/dev/null 2>&1
 	else
 		"${cmdline[@]}" "${flag}" -c -o /dev/null /dev/null >/dev/null 2>&1
 	fi
 }

 # @FUNCTION: test-flag-CC
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
 test-flag-CC() { test-flag-PROG "CC" c "$1"; }

 # @FUNCTION: test-flag-CXX
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
 test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }

 # @FUNCTION: test-flag-F77
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
 test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }

 # @FUNCTION: test-flag-FC
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
 test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }

 test-flags-PROG() {
 	local comp=$1
 	local flags=()
 	local x

 	shift

 	[[ -z ${comp} ]] && return 1

 	for x ; do
 		test-flag-${comp} "${x}" && flags+=( "${x}" )
 	done

 	echo "${flags[*]}"

 	# Just bail if we dont have any flags
 	[[ ${#flags[@]} -gt 0 ]]
 }

 # @FUNCTION: test-flags-CC
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
 test-flags-CC() { test-flags-PROG "CC" "$@"; }

 # @FUNCTION: test-flags-CXX
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }

 # @FUNCTION: test-flags-F77
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
 test-flags-F77() { test-flags-PROG "F77" "$@"; }

 # @FUNCTION: test-flags-FC
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
 test-flags-FC() { test-flags-PROG "FC" "$@"; }

 # @FUNCTION: test-flags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Short-hand that should hopefully work for both C and C++ compiler, but
 # its really only present due to the append-flags() abomination.
 test-flags() { test-flags-CC "$@"; }

 # @FUNCTION: test_version_info
 # @USAGE: <version>
 # @DESCRIPTION:
 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
 # Accepts shell globs.
 test_version_info() {
 	if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
 		return 0
 	else
 		return 1
 	fi
 }

 # @FUNCTION: strip-unsupported-flags
 # @DESCRIPTION:
 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
 strip-unsupported-flags() {
 	export CFLAGS=$(test-flags-CC ${CFLAGS})
 	export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
 	export FFLAGS=$(test-flags-F77 ${FFLAGS})
 	export FCFLAGS=$(test-flags-FC ${FCFLAGS})
 }

 # @FUNCTION: get-flag
 # @USAGE: <flag>
 # @DESCRIPTION:
 # Find and echo the value for a particular flag.  Accepts shell globs.
 get-flag() {
 	local f var findflag="$1"

 	# this code looks a little flaky but seems to work for
 	# everything we want ...
 	# for example, if CFLAGS="-march=i686":
 	# `get-flag -march` == "-march=i686"
 	# `get-flag march` == "i686"
 	for var in $(all-flag-vars) ; do
 		for f in ${!var} ; do
 			if [ "${f/${findflag}}" != "${f}" ] ; then
 				printf "%s\n" "${f/-${findflag}=}"
 				return 0
 			fi
 		done
 	done
 	return 1
 }

 # @FUNCTION: has_m64
 # @DESCRIPTION:
 # This doesn't test if the flag is accepted, it tests if the flag actually
 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
 # return code is 0, else the return code is 1.
 has_m64() {
 	eqawarn "${FUNCNAME}: don't use this anymore"

 	# this doesnt test if the flag is accepted, it tests if the flag
 	# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
 	# please dont replace this function with test_flag in some future
 	# clean-up!

 	local temp="$(emktemp)"
 	echo "int main() { return(0); }" > "${temp}".c
 	MY_CC=$(tc-getCC)
 	${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
 	local ret=$?
 	rm -f "${temp}".c
 	[[ ${ret} != 1 ]] && return 0
 	return 1
 }

 has_m32() {
 	die "${FUNCNAME}: don't use this anymore"
 }

 # @FUNCTION: replace-sparc64-flags
 # @DESCRIPTION:
 # Sets mcpu to v8 and uses the original value as mtune if none specified.
 replace-sparc64-flags() {
 	local SPARC64_CPUS="ultrasparc3 ultrasparc v9"

 	if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
 		for x in ${SPARC64_CPUS}; do
 			CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
 		done
 	else
 		for x in ${SPARC64_CPUS}; do
 			CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
 		done
 	fi

 	if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
 		for x in ${SPARC64_CPUS}; do
 			CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
 		done
 	else
 		for x in ${SPARC64_CPUS}; do
 			CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
 		done
 	fi

 	export CFLAGS CXXFLAGS
 }

 # @FUNCTION: append-libs
 # @USAGE: <libs>
 # @DESCRIPTION:
 # Add extra <libs> to the current LIBS. All arguments should be prefixed with
 # either -l or -L.  For compatibility, if arguments are not prefixed as
 # options, they are given a -l prefix automatically.
 append-libs() {
 	[[ $# -eq 0 ]] && return 0
 	local flag
 	for flag in "$@"; do
 		if [[ -z "${flag// }" ]]; then
 			eqawarn "Appending an empty argument to LIBS is invalid! Skipping."
 			continue
 		fi
 		case $flag in
 			-[lL]*)
 				export LIBS="${LIBS} ${flag}"
 				;;
 			-*)
 				eqawarn "Appending non-library to LIBS (${flag}); Other linker flags should be passed via LDFLAGS"
 				export LIBS="${LIBS} ${flag}"
 				;;
 			*)
 				export LIBS="${LIBS} -l${flag}"
 		esac
 	done

 	return 0
 }

 # @FUNCTION: raw-ldflags
 # @USAGE: [flags]
 # @DESCRIPTION:
 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
 # to gcc where it needs the '-Wl,'.
 #
 # If no flags are specified, then default to ${LDFLAGS}.
 raw-ldflags() {
 	local x input="$@"
 	[[ -z ${input} ]] && input=${LDFLAGS}
 	set --
 	for x in ${input} ; do
 		case ${x} in
 		-Wl,*)
 			x=${x#-Wl,}
 			set -- "$@" ${x//,/ }
 			;;
 		*)	# Assume it's a compiler driver flag, so throw it away #441808
 			;;
 		esac
 	done
 	echo "$@"
 }

 # @FUNCTION: no-as-needed
 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
 no-as-needed() {
 	case $($(tc-getLD) -v 2>&1 </dev/null) in
 		*GNU*) # GNU ld
 		echo "-Wl,--no-as-needed" ;;
 	esac
 }

 fi
	# Copyright 1999-2014 Gentoo Foundation
	# Distributed under the terms of the GNU General Public License v2
	# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.205 2015/05/06 07:04:53 vapier Exp $

	# @ECLASS: flag-o-matic.eclass
	# @MAINTAINER:
	# toolchain@gentoo.org
	# @BLURB: common functions to manipulate and query toolchain flags
	# @DESCRIPTION:
	# This eclass contains a suite of functions to help developers sanely
	# and safely manage toolchain flags in their builds.

	if [[ -z ${_FLAG_O_MATIC_ECLASS} ]]; then
	_FLAG_O_MATIC_ECLASS=1

	inherit eutils toolchain-funcs multilib

	# Return all the flag variables that our high level funcs operate on.
	all-flag-vars() {
	echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
	}

	# {C,CPP,CXX,CCAS,F,FC,LD}FLAGS that we allow in strip-flags
	# Note: shell globs and character lists are allowed
	setup-allowed-flags() {
	ALLOWED_FLAGS="-pipe"
	ALLOWED_FLAGS+=" -O -O1 -O2 -Os -Og -mcpu -march -mtune"
	ALLOWED_FLAGS+=" -fstack-protector* -fsanitize=*"
	ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
	ALLOWED_FLAGS+=" -fno-PIE -fno-pie -nopie -fno-unit-at-a-time"
	ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gdwarf-* gstabs -gstabs+"
	ALLOWED_FLAGS+=" -fno-ident -fpermissive -frecord-gcc-switches"
	ALLOWED_FLAGS+=" -fdiagnostics*"
	ALLOWED_FLAGS+=" -W* -w"

	# allow a bunch of flags that negate features / control ABI
	ALLOWED_FLAGS+=" -fno-stack-protector* -fabi-version=* \
	-fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
	-fno-omit-frame-pointer -fno-builtin*"
	ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
	-mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
	-mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
	-mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
	-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
	-mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
	-mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
	-mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
	-mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
	-mstack-bias -mno-stack-bias -msecure-plt -m*-toc -mfloat-abi \
	-mfix-r10000 -mno-fix-r10000 -D* -U*"

	# 4.5
	ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
	# 4.6
	ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
	# 4.7
	ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
	# 4.8
	ALLOWED_FLAGS+=" -mno-fxsr -mno-rtm -mno-xsave -mno-xsaveopt"
	# 4.9
	ALLOWED_FLAGS+=" -mno-avx512cd -mno-avx512er -mno-avx512f -mno-avx512pf -mno-sha"

	# CPPFLAGS and LDFLAGS
	ALLOWED_FLAGS+=" -I* -L* -R* -Wl,*"

	export ALLOWED_FLAGS
	return 0
	}

	# inverted filters for hardened compiler. This is trying to unpick
	# the hardened compiler defaults.
	_filter-hardened() {
	local f
	for f in "$@" ; do
	case "${f}" in
	# Ideally we should only concern ourselves with PIE flags,
	# not -fPIC or -fpic, but too many places filter -fPIC without
	# thinking about -fPIE.
	-fPIC\|-fpic\|-fPIE\|-fpie\|-Wl,pie\|-pie)
	gcc-specs-pie \|\| continue
	is-flagq -nopie \|\| append-flags -nopie;;
	-fstack-protector)
	gcc-specs-ssp \|\| continue
	is-flagq -fno-stack-protector \|\| append-flags $(test-flags -fno-stack-protector);;
	-fstack-protector-all)
	gcc-specs-ssp-to-all \|\| continue
	is-flagq -fno-stack-protector-all \|\| append-flags $(test-flags -fno-stack-protector-all);;
	-fno-strict-overflow)
	gcc-specs-nostrict \|\| continue
	is-flagq -fstrict-overflow \|\| append-flags $(test-flags -fstrict-overflow);;
	esac
	done
	}

	# Remove occurrences of strings from variable given in $1
	# Strings removed are matched as globs, so for example
	# '-O*' would remove -O1, -O2 etc.
	_filter-var() {
	local f x var=$1 new=()
	shift

	for f in ${!var} ; do
	for x in "$@" ; do
	# Note this should work with globs like -O*
	[[ ${f} == ${x} ]] && continue 2
	done
	new+=( "${f}" )
	done
	eval export ${var}=\""${new[*]}"\"
	}

	# @FUNCTION: filter-flags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
	filter-flags() {
	_filter-hardened "$@"
	local v
	for v in $(all-flag-vars) ; do
	_filter-var ${v} "$@"
	done
	return 0
	}

	# @FUNCTION: filter-lfs-flags
	# @DESCRIPTION:
	# Remove flags that enable Large File Support.
	filter-lfs-flags() {
	[[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
	# http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
	# _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
	# _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
	# _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
	filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
	}

	# @FUNCTION: filter-ldflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Remove particular <flags> from LDFLAGS. Accepts shell globs.
	filter-ldflags() {
	_filter-var LDFLAGS "$@"
	return 0
	}

	# @FUNCTION: append-cppflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to the current CPPFLAGS.
	append-cppflags() {
	[[ $# -eq 0 ]] && return 0
	export CPPFLAGS+=" $*"
	return 0
	}

	# @FUNCTION: append-cflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to the current CFLAGS. If a flag might not be supported
	# with different compilers (or versions), then use test-flags-CC like so:
	# @CODE
	# append-cflags $(test-flags-CC -funky-flag)
	# @CODE
	append-cflags() {
	[[ $# -eq 0 ]] && return 0
	# Do not do automatic flag testing ourselves. #417047
	export CFLAGS+=" $*"
	return 0
	}

	# @FUNCTION: append-cxxflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to the current CXXFLAGS. If a flag might not be supported
	# with different compilers (or versions), then use test-flags-CXX like so:
	# @CODE
	# append-cxxflags $(test-flags-CXX -funky-flag)
	# @CODE
	append-cxxflags() {
	[[ $# -eq 0 ]] && return 0
	# Do not do automatic flag testing ourselves. #417047
	export CXXFLAGS+=" $*"
	return 0
	}

	# @FUNCTION: append-fflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to the current {F,FC}FLAGS. If a flag might not be supported
	# with different compilers (or versions), then use test-flags-F77 like so:
	# @CODE
	# append-fflags $(test-flags-F77 -funky-flag)
	# @CODE
	append-fflags() {
	[[ $# -eq 0 ]] && return 0
	# Do not do automatic flag testing ourselves. #417047
	export FFLAGS+=" $*"
	export FCFLAGS+=" $*"
	return 0
	}

	# @FUNCTION: append-lfs-flags
	# @DESCRIPTION:
	# Add flags that enable Large File Support.
	append-lfs-flags() {
	[[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
	# see comments in filter-lfs-flags func for meaning of these
	append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
	}

	# @FUNCTION: append-ldflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to the current LDFLAGS.
	append-ldflags() {
	[[ $# -eq 0 ]] && return 0
	local flag
	for flag in "$@"; do
	[[ ${flag} == -l* ]] && \
	eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
	done

	export LDFLAGS="${LDFLAGS} $*"
	return 0
	}

	# @FUNCTION: append-flags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
	append-flags() {
	[[ $# -eq 0 ]] && return 0
	case " $* " in
	' '-[DIU]) eqawarn 'please use append-cppflags for preprocessor flags' ;;
	' '-L\|\
	' '-Wl,) eqawarn 'please use append-ldflags for linker flags' ;;
	esac
	append-cflags "$@"
	append-cxxflags "$@"
	append-fflags "$@"
	return 0
	}

	# @FUNCTION: replace-flags
	# @USAGE: <old> <new>
	# @DESCRIPTION:
	# Replace the <old> flag with <new>. Accepts shell globs for <old>.
	replace-flags() {
	[[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"

	local f var new
	for var in $(all-flag-vars) ; do
	# Looping over the flags instead of using a global
	# substitution ensures that we're working with flag atoms.
	# Otherwise globs like -O* have the potential to wipe out the
	# list of flags.
	new=()
	for f in ${!var} ; do
	# Note this should work with globs like -O*
	[[ ${f} == ${1} ]] && f=${2}
	new+=( "${f}" )
	done
	eval export ${var}=\""${new[*]}"\"
	done

	return 0
	}

	# @FUNCTION: replace-cpu-flags
	# @USAGE: <old> <new>
	# @DESCRIPTION:
	# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
	# with flags that select the <new> cpu. Accepts shell globs for <old>.
	replace-cpu-flags() {
	local newcpu="$#" ; newcpu="${!newcpu}"
	while [ $# -gt 1 ] ; do
	# quote to make sure that no globbing is done (particularly on
	# ${oldcpu}) prior to calling replace-flags
	replace-flags "-march=${1}" "-march=${newcpu}"
	replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
	replace-flags "-mtune=${1}" "-mtune=${newcpu}"
	shift
	done
	return 0
	}

	_is_flagq() {
	local x var
	eval var=\""\${$1[*]}"\"
	for x in ${var} ; do
	[[ ${x} == $2 ]] && return 0
	done
	return 1
	}

	# @FUNCTION: is-flagq
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
	is-flagq() {
	[[ -n $2 ]] && die "Usage: is-flag <flag>"

	local var
	for var in $(all-flag-vars) ; do
	_is_flagq ${var} "$1" && return 0
	done
	return 1
	}

	# @FUNCTION: is-flag
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
	is-flag() {
	is-flagq "$@" && echo true
	}

	# @FUNCTION: is-ldflagq
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
	is-ldflagq() {
	[[ -n $2 ]] && die "Usage: is-ldflag <flag>"
	_is_flagq LDFLAGS $1
	}

	# @FUNCTION: is-ldflag
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
	is-ldflag() {
	is-ldflagq "$@" && echo true
	}

	# @FUNCTION: filter-mfpmath
	# @USAGE: <math types>
	# @DESCRIPTION:
	# Remove specified math types from the fpmath flag. For example, if the user
	# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
	# -mfpmath=386.
	filter-mfpmath() {
	local orig_mfpmath new_math prune_math

	# save the original -mfpmath flag
	orig_mfpmath=$(get-flag -mfpmath)
	# get the value of the current -mfpmath flag
	new_math=$(get-flag mfpmath)
	# convert "both" to something we can filter
	new_math=${new_math/both/387,sse}
	new_math=" ${new_math//[,+]/ } "
	# figure out which math values are to be removed
	prune_math=""
	for prune_math in "$@" ; do
	new_math=${new_math/ ${prune_math} / }
	done
	new_math=$(echo ${new_math})
	new_math=${new_math// /,}

	if [[ -z ${new_math} ]] ; then
	# if we're removing all user specified math values are
	# slated for removal, then we just filter the flag
	filter-flags ${orig_mfpmath}
	else
	# if we only want to filter some of the user specified
	# math values, then we replace the current flag
	replace-flags ${orig_mfpmath} -mfpmath=${new_math}
	fi
	return 0
	}

	# @FUNCTION: strip-flags
	# @DESCRIPTION:
	# Strip *FLAGS of everything except known good/safe flags. This runs over all
	# flags returned by all_flag_vars().
	strip-flags() {
	local x y var

	setup-allowed-flags

	set -f # disable pathname expansion

	for var in $(all-flag-vars) ; do
	local new=()

	for x in ${!var} ; do
	local flag=${x%%=*}
	for y in ${ALLOWED_FLAGS} ; do
	if [[ -z ${flag%%${y}} ]] ; then
	new+=( "${x}" )
	break
	fi
	done
	done

	# In case we filtered out all optimization flags fallback to -O2
	if _is_flagq ${var} "-O" && ! _is_flagq new "-O" ; then
	new+=( -O2 )
	fi

	if [[ ${!var} != "${new[*]}" ]] ; then
	einfo "strip-flags: ${var}: changed '${!var}' to '${new[*]}'"
	fi
	eval export ${var}=\""${new[*]}"\"
	done

	set +f # re-enable pathname expansion

	return 0
	}

	test-flag-PROG() {
	local comp=$1
	local lang=$2
	local flag=$3

	[[ -z ${comp} \|\| -z ${flag} ]] && return 1

	local cmdline=(
	$(tc-get${comp})
	# Clang will warn about unknown gcc flags but exit 0.
	# Need -Werror to force it to exit non-zero.
	-Werror
	# Use -c so we can test the assembler as well.
	-c -o /dev/null
	)
	if "${cmdline[@]}" -x${lang} - </dev/null >/dev/null 2>&1 ; then
	"${cmdline[@]}" "${flag}" -x${lang} - </dev/null >/dev/null 2>&1
	else
	"${cmdline[@]}" "${flag}" -c -o /dev/null /dev/null >/dev/null 2>&1
	fi
	}

	# @FUNCTION: test-flag-CC
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
	test-flag-CC() { test-flag-PROG "CC" c "$1"; }

	# @FUNCTION: test-flag-CXX
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
	test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }

	# @FUNCTION: test-flag-F77
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
	test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }

	# @FUNCTION: test-flag-FC
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
	test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }

	test-flags-PROG() {
	local comp=$1
	local flags=()
	local x

	shift

	[[ -z ${comp} ]] && return 1

	for x ; do
	test-flag-${comp} "${x}" && flags+=( "${x}" )
	done

	echo "${flags[*]}"

	# Just bail if we dont have any flags
	[[ ${#flags[@]} -gt 0 ]]
	}

	# @FUNCTION: test-flags-CC
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
	test-flags-CC() { test-flags-PROG "CC" "$@"; }

	# @FUNCTION: test-flags-CXX
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
	test-flags-CXX() { test-flags-PROG "CXX" "$@"; }

	# @FUNCTION: test-flags-F77
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
	test-flags-F77() { test-flags-PROG "F77" "$@"; }

	# @FUNCTION: test-flags-FC
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
	test-flags-FC() { test-flags-PROG "FC" "$@"; }

	# @FUNCTION: test-flags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Short-hand that should hopefully work for both C and C++ compiler, but
	# its really only present due to the append-flags() abomination.
	test-flags() { test-flags-CC "$@"; }

	# @FUNCTION: test_version_info
	# @USAGE: <version>
	# @DESCRIPTION:
	# Returns shell true if the current C compiler version matches <version>, else returns shell false.
	# Accepts shell globs.
	test_version_info() {
	if [[ $($(tc-getCC) --version 2>&1) == $1 ]]; then
	return 0
	else
	return 1
	fi
	}

	# @FUNCTION: strip-unsupported-flags
	# @DESCRIPTION:
	# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
	strip-unsupported-flags() {
	export CFLAGS=$(test-flags-CC ${CFLAGS})
	export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
	export FFLAGS=$(test-flags-F77 ${FFLAGS})
	export FCFLAGS=$(test-flags-FC ${FCFLAGS})
	}

	# @FUNCTION: get-flag
	# @USAGE: <flag>
	# @DESCRIPTION:
	# Find and echo the value for a particular flag. Accepts shell globs.
	get-flag() {
	local f var findflag="$1"

	# this code looks a little flaky but seems to work for
	# everything we want ...
	# for example, if CFLAGS="-march=i686":
	# `get-flag -march` == "-march=i686"
	# `get-flag march` == "i686"
	for var in $(all-flag-vars) ; do
	for f in ${!var} ; do
	if [ "${f/${findflag}}" != "${f}" ] ; then
	printf "%s\n" "${f/-${findflag}=}"
	return 0
	fi
	done
	done
	return 1
	}

	# @FUNCTION: has_m64
	# @DESCRIPTION:
	# This doesn't test if the flag is accepted, it tests if the flag actually
	# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
	# return code is 0, else the return code is 1.
	has_m64() {
	eqawarn "${FUNCNAME}: don't use this anymore"

	# this doesnt test if the flag is accepted, it tests if the flag
	# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
	# please dont replace this function with test_flag in some future
	# clean-up!

	local temp="$(emktemp)"
	echo "int main() { return(0); }" > "${temp}".c
	MY_CC=$(tc-getCC)
	${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
	local ret=$?
	rm -f "${temp}".c
	[[ ${ret} != 1 ]] && return 0
	return 1
	}

	has_m32() {
	die "${FUNCNAME}: don't use this anymore"
	}

	# @FUNCTION: replace-sparc64-flags
	# @DESCRIPTION:
	# Sets mcpu to v8 and uses the original value as mtune if none specified.
	replace-sparc64-flags() {
	local SPARC64_CPUS="ultrasparc3 ultrasparc v9"

	if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
	for x in ${SPARC64_CPUS}; do
	CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
	done
	else
	for x in ${SPARC64_CPUS}; do
	CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
	done
	fi

	if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
	for x in ${SPARC64_CPUS}; do
	CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
	done
	else
	for x in ${SPARC64_CPUS}; do
	CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
	done
	fi

	export CFLAGS CXXFLAGS
	}

	# @FUNCTION: append-libs
	# @USAGE: <libs>
	# @DESCRIPTION:
	# Add extra <libs> to the current LIBS. All arguments should be prefixed with
	# either -l or -L. For compatibility, if arguments are not prefixed as
	# options, they are given a -l prefix automatically.
	append-libs() {
	[[ $# -eq 0 ]] && return 0
	local flag
	for flag in "$@"; do
	if [[ -z "${flag// }" ]]; then
	eqawarn "Appending an empty argument to LIBS is invalid! Skipping."
	continue
	fi
	case $flag in
	-[lL]*)
	export LIBS="${LIBS} ${flag}"
	;;
	-*)
	eqawarn "Appending non-library to LIBS (${flag}); Other linker flags should be passed via LDFLAGS"
	export LIBS="${LIBS} ${flag}"
	;;
	*)
	export LIBS="${LIBS} -l${flag}"
	esac
	done

	return 0
	}

	# @FUNCTION: raw-ldflags
	# @USAGE: [flags]
	# @DESCRIPTION:
	# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
	# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
	# to gcc where it needs the '-Wl,'.
	#
	# If no flags are specified, then default to ${LDFLAGS}.
	raw-ldflags() {
	local x input="$@"
	[[ -z ${input} ]] && input=${LDFLAGS}
	set --
	for x in ${input} ; do
	case ${x} in
	-Wl,*)
	x=${x#-Wl,}
	set -- "$@" ${x//,/ }
	;;
	*) # Assume it's a compiler driver flag, so throw it away #441808
	;;
	esac
	done
	echo "$@"
	}

	# @FUNCTION: no-as-needed
	# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
	no-as-needed() {
	case $($(tc-getLD) -v 2>&1 </dev/null) in
	GNU) # GNU ld
	echo "-Wl,--no-as-needed" ;;
	esac
	}

	fi