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

 # Copyright 1999-2009 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.146 2010/02/17 18:20:49 ssuominen 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.

 inherit eutils toolchain-funcs multilib

 ################ DEPRECATED functions ################
 # The following are still present to avoid breaking existing
 # code more than necessary; however they are deprecated. Please
 # use gcc-specs-* from toolchain-funcs.eclass instead, if you
 # need to know which hardened techs are active in the compiler.
 # See bug #100974
 #
 # has_hardened
 # has_pie
 # has_pic
 # has_ssp_all
 # has_ssp


 # {C,CXX,F,FC}FLAGS that we allow in strip-flags
 # Note: shell globs and character lists are allowed
 setup-allowed-flags() {
 	if [[ -z ${ALLOWED_FLAGS} ]] ; then
 		export ALLOWED_FLAGS="-pipe"
 		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
 		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
 		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-strict-overflow"
 		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
 		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
 		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
 		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
 	fi
 	# allow a bunch of flags that negate features / control ABI
 	ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
 		-fno-strict-aliasing -fno-bounds-checking -fstrict-overflow -fno-omit-frame-pointer"
 	ALLOWED_FLAGS="${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 \
 		-mtls-direct-seg-refs -mno-tls-direct-seg-refs \
 		-mflat -mno-flat -mno-faster-structs -mfaster-structs \
 		-m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
 		-mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
 		-msecure-plt -m*-toc -D* -U*"

 	# {C,CXX,F,FC}FLAGS that we are think is ok, but needs testing
 	# NOTE:  currently -Os have issues with gcc3 and K6* arch's
 	export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
 	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 VAL
 	declare -a new

 	VAR=$1
 	shift
 	eval VAL=\${${VAR}}
 	for f in ${VAL}; do
 		for x in "$@"; do
 			# Note this should work with globs like -O*
 			[[ ${f} == ${x} ]] && continue 2
 		done
 		eval new\[\${\#new\[@]}]=\${f}
 	done
 	eval export ${VAR}=\${new\[*]}
 }

 # @FUNCTION: filter-flags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Remove particular <flags> from {C,CPP,CXX,F,FC}FLAGS.  Accepts shell globs.
 filter-flags() {
 	_filter-hardened "$@"
 	_filter-var CFLAGS "$@"
 	_filter-var CPPFLAGS "$@"
 	_filter-var CXXFLAGS "$@"
 	_filter-var FFLAGS "$@"
 	_filter-var FCFLAGS "$@"
 	return 0
 }

 # @FUNCTION: filter-lfs-flags
 # @DESCRIPTION:
 # Remove flags that enable Large File Support.
 filter-lfs-flags() {
 	[[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
 	filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
 }

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

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

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

 # @FUNCTION: append-fflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to the current {F,FC}FLAGS.
 append-fflags() {
 	[[ -z $* ]] && return 0
 	export FFLAGS="${FFLAGS} $*"
 	export FCFLAGS="${FCFLAGS} $*"
 	return 0
 }

 # @FUNCTION: append-lfs-flags
 # @DESCRIPTION:
 # Add flags that enable Large File Support.
 append-lfs-flags() {
 	[[ -n $@ ]] && die "append-lfs-flags takes no arguments"
 	append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
 }

 # @FUNCTION: append-flags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
 append-flags() {
 	[[ -z $* ]] && return 0
 	append-cflags "$@"
 	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 ]] \
 		&& echo && eerror "Usage: replace-flags <old flag> <new flag>" \
 		&& die "replace-flags takes 2 arguments, not $#"

 	local f fset
 	declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS

 	for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; 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.
 		for f in ${!fset}; do
 			# Note this should work with globs like -O*
 			[[ ${f} == ${1} ]] && f=${2}
 			eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
 		done
 		eval export ${fset}=\${new_${fset}\[*]}
 	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
 	for x in ${!1} ; 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>"
 	_is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1 || _is_flagq FFLAGS $1 || _is_flagq FCFLAGS $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)
 	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 C[XX]FLAGS of everything except known good/safe flags.
 strip-flags() {
 	local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS

 	setup-allowed-flags

 	local NEW_CFLAGS=""
 	local NEW_CXXFLAGS=""
 	local NEW_FFLAGS=""
 	local NEW_FCFLAGS=""

 	# Allow unstable C[XX]FLAGS if we are using unstable profile ...
 	if has "~$(tc-arch)" ${ACCEPT_KEYWORDS} ; then
 		ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
 	fi

 	set -f	# disable pathname expansion

 	for x in ${CFLAGS}; do
 		for y in ${ALLOWED_FLAGS}; do
 			flag=${x%%=*}
 			if [ "${flag%%${y}}" = "" ] ; then
 				NEW_CFLAGS="${NEW_CFLAGS} ${x}"
 				break
 			fi
 		done
 	done

 	for x in ${CXXFLAGS}; do
 		for y in ${ALLOWED_FLAGS}; do
 			flag=${x%%=*}
 			if [ "${flag%%${y}}" = "" ] ; then
 				NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
 				break
 			fi
 		done
 	done

 	for x in ${FFLAGS}; do
 		for y in ${ALLOWED_FLAGS}; do
 			flag=${x%%=*}
 			if [ "${flag%%${y}}" = "" ] ; then
 				NEW_FFLAGS="${NEW_FFLAGS} ${x}"
 				break
 			fi
 		done
 	done

 	for x in ${FCFLAGS}; do
 		for y in ${ALLOWED_FLAGS}; do
 			flag=${x%%=*}
 			if [ "${flag%%${y}}" = "" ] ; then
 				NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
 				break
 			fi
 		done
 	done

 	# In case we filtered out all optimization flags fallback to -O2
 	if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
 		NEW_CFLAGS="${NEW_CFLAGS} -O2"
 	fi
 	if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
 		NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
 	fi
 	if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
 		NEW_FFLAGS="${NEW_FFLAGS} -O2"
 	fi
 	if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
 		NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
 	fi

 	set +f	# re-enable pathname expansion

 	export CFLAGS="${NEW_CFLAGS}"
 	export CXXFLAGS="${NEW_CXXFLAGS}"
 	export FFLAGS="${NEW_FFLAGS}"
 	export FCFLAGS="${NEW_FCFLAGS}"
 	return 0
 }

 test-flag-PROG() {
 	local comp=$1
 	local flags="$2"

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

 	local PROG=$(tc-get${comp})
 	${PROG} ${flags} -S -o /dev/null -xc /dev/null \
 		> /dev/null 2>&1
 }

 # @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" "$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" "$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" "$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" "$1"; }

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

 	shift

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

 	x=""
 	for x in "$@" ; do
 		test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
 	done

 	echo "${flags}"

 	# Just bail if we dont have any flags
 	[[ -n ${flags} ]]
 }

 # @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_flag
 # @DESCRIPTION:
 # DEPRICIATED, use test-flags()
 test_flag() {
 	ewarn "test_flag: deprecated, please use test-flags()!" >&2

 	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 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 f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
 		if [ "${f/${findflag}}" != "${f}" ] ; then
 			printf "%s\n" "${f/-${findflag}=}"
 			return 0
 		fi
 	done
 	return 1
 }

 # @FUNCTION: has_hardened
 # @DESCRIPTION:
 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
 has_hardened() {
 	ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2

 	test_version_info Hardened && return 0
 	# The specs file wont exist unless gcc has GCC_SPECS support
 	[[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
 }

 # @FUNCTION: has_pic
 # @DESCRIPTION:
 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
 # indicate whether PIC is set
 has_pic() {
 	ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2

 	[[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
 	   ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
 	gcc-specs-pie
 }

 # @FUNCTION: has_pie
 # @DESCRIPTION:
 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
 # indicate whether PIE is set
 has_pie() {
 	ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2

 	[[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
 	   ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
 	gcc-specs-pie
 }

 # @FUNCTION: has_ssp_all
 # @DESCRIPTION:
 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
 # indicate whether code for SSP is being generated for all functions
 has_ssp_all() {
 	ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2

 	# note; this matches only -fstack-protector-all
 	[[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
 	   -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
 	gcc-specs-ssp-to-all
 }

 # @FUNCTION: has_ssp
 # @DESCRIPTION:
 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
 # indicate whether code for SSP is being generated
 has_ssp() {
 	ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2

 	# note; this matches both -fstack-protector and -fstack-protector-all
 	[[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
 	   -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
 	gcc-specs-ssp
 }

 # @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() {
 	# 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
 }

 # @FUNCTION: has_m32
 # @DESCRIPTION:
 # This doesn't test if the flag is accepted, it tests if the flag actually
 # WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
 # code is 0, else return code is 1.
 has_m32() {
 	# 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!

 	[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0

 	local temp=$(emktemp)
 	echo "int main() { return(0); }" > "${temp}".c
 	MY_CC=$(tc-getCC)
 	${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
 	local ret=$?
 	rm -f "${temp}".c
 	[[ ${ret} != 1 ]] && return 0
 	return 1
 }

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

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

 # @FUNCTION: filter-ldflags
 # @USAGE: <flags>
 # @DESCRIPTION:
 # Remove particular <flags> from LDFLAGS.  Accepts shell globs.
 filter-ldflags() {
 	_filter-var LDFLAGS "$@"
 	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,'.
 raw-ldflags() {
 	local x input="$@"
 	[[ -z ${input} ]] && input=${LDFLAGS}
 	set --
 	for x in ${input} ; do
 		x=${x#-Wl,}
 		set -- "$@" ${x//,/ }
 	done
 	echo "$@"
 }

 # @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
 }

 # Some tests for when we screw with things and want to make
 # sure we didn't break anything
 #TESTS() {
 #	CFLAGS="-a -b -c=1"
 #	CXXFLAGS="-x -y -z=2"
 #	LDFLAGS="-l -m -n=3"
 #
 #	die() { exit 1; }
 #	(is-flag 1 2 3) && die
 #	(is-ldflag 1 2 3) && die
 #
 #	is-flagq -l && die
 #	is-ldflagq -a && die
 #	is-flagq -a || die
 #	is-flagq -x || die
 #	is-ldflagq -n=* || die
 #	is-ldflagq -n && die
 #
 #	strip-unsupported-flags
 #	[[ ${CFLAGS} == "-c=1" ]] || die
 #	[[ ${CXXFLAGS} == "-y -z=2" ]] || die
 #
 #	echo "All tests pass"
 #}
 #TESTS
	# Copyright 1999-2009 Gentoo Foundation
	# Distributed under the terms of the GNU General Public License v2
	# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.146 2010/02/17 18:20:49 ssuominen 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.

	inherit eutils toolchain-funcs multilib

	################ DEPRECATED functions ################
	# The following are still present to avoid breaking existing
	# code more than necessary; however they are deprecated. Please
	# use gcc-specs-* from toolchain-funcs.eclass instead, if you
	# need to know which hardened techs are active in the compiler.
	# See bug #100974
	#
	# has_hardened
	# has_pie
	# has_pic
	# has_ssp_all
	# has_ssp


	# {C,CXX,F,FC}FLAGS that we allow in strip-flags
	# Note: shell globs and character lists are allowed
	setup-allowed-flags() {
	if [[ -z ${ALLOWED_FLAGS} ]] ; then
	export ALLOWED_FLAGS="-pipe"
	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-strict-overflow"
	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
	fi
	# allow a bunch of flags that negate features / control ABI
	ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
	-fno-strict-aliasing -fno-bounds-checking -fstrict-overflow -fno-omit-frame-pointer"
	ALLOWED_FLAGS="${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 \
	-mtls-direct-seg-refs -mno-tls-direct-seg-refs \
	-mflat -mno-flat -mno-faster-structs -mfaster-structs \
	-m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
	-mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
	-msecure-plt -m-toc -D -U*"

	# {C,CXX,F,FC}FLAGS that we are think is ok, but needs testing
	# NOTE: currently -Os have issues with gcc3 and K6* arch's
	export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
	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 VAL
	declare -a new

	VAR=$1
	shift
	eval VAL=\${${VAR}}
	for f in ${VAL}; do
	for x in "$@"; do
	# Note this should work with globs like -O*
	[[ ${f} == ${x} ]] && continue 2
	done
	eval new\[\${\#new\[@]}]=\${f}
	done
	eval export ${VAR}=\${new\[*]}
	}

	# @FUNCTION: filter-flags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Remove particular <flags> from {C,CPP,CXX,F,FC}FLAGS. Accepts shell globs.
	filter-flags() {
	_filter-hardened "$@"
	_filter-var CFLAGS "$@"
	_filter-var CPPFLAGS "$@"
	_filter-var CXXFLAGS "$@"
	_filter-var FFLAGS "$@"
	_filter-var FCFLAGS "$@"
	return 0
	}

	# @FUNCTION: filter-lfs-flags
	# @DESCRIPTION:
	# Remove flags that enable Large File Support.
	filter-lfs-flags() {
	[[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
	filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
	}

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

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

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

	# @FUNCTION: append-fflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to the current {F,FC}FLAGS.
	append-fflags() {
	[[ -z $* ]] && return 0
	export FFLAGS="${FFLAGS} $*"
	export FCFLAGS="${FCFLAGS} $*"
	return 0
	}

	# @FUNCTION: append-lfs-flags
	# @DESCRIPTION:
	# Add flags that enable Large File Support.
	append-lfs-flags() {
	[[ -n $@ ]] && die "append-lfs-flags takes no arguments"
	append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
	}

	# @FUNCTION: append-flags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
	append-flags() {
	[[ -z $* ]] && return 0
	append-cflags "$@"
	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 ]] \
	&& echo && eerror "Usage: replace-flags <old flag> <new flag>" \
	&& die "replace-flags takes 2 arguments, not $#"

	local f fset
	declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS

	for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; 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.
	for f in ${!fset}; do
	# Note this should work with globs like -O*
	[[ ${f} == ${1} ]] && f=${2}
	eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
	done
	eval export ${fset}=\${new_${fset}\[*]}
	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
	for x in ${!1} ; 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>"
	_is_flagq CFLAGS $1 \|\| _is_flagq CXXFLAGS $1 \|\| _is_flagq FFLAGS $1 \|\| _is_flagq FCFLAGS $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)
	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 C[XX]FLAGS of everything except known good/safe flags.
	strip-flags() {
	local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS

	setup-allowed-flags

	local NEW_CFLAGS=""
	local NEW_CXXFLAGS=""
	local NEW_FFLAGS=""
	local NEW_FCFLAGS=""

	# Allow unstable C[XX]FLAGS if we are using unstable profile ...
	if has "~$(tc-arch)" ${ACCEPT_KEYWORDS} ; then
	ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
	fi

	set -f # disable pathname expansion

	for x in ${CFLAGS}; do
	for y in ${ALLOWED_FLAGS}; do
	flag=${x%%=*}
	if [ "${flag%%${y}}" = "" ] ; then
	NEW_CFLAGS="${NEW_CFLAGS} ${x}"
	break
	fi
	done
	done

	for x in ${CXXFLAGS}; do
	for y in ${ALLOWED_FLAGS}; do
	flag=${x%%=*}
	if [ "${flag%%${y}}" = "" ] ; then
	NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
	break
	fi
	done
	done

	for x in ${FFLAGS}; do
	for y in ${ALLOWED_FLAGS}; do
	flag=${x%%=*}
	if [ "${flag%%${y}}" = "" ] ; then
	NEW_FFLAGS="${NEW_FFLAGS} ${x}"
	break
	fi
	done
	done

	for x in ${FCFLAGS}; do
	for y in ${ALLOWED_FLAGS}; do
	flag=${x%%=*}
	if [ "${flag%%${y}}" = "" ] ; then
	NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
	break
	fi
	done
	done

	# In case we filtered out all optimization flags fallback to -O2
	if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
	NEW_CFLAGS="${NEW_CFLAGS} -O2"
	fi
	if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
	NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
	fi
	if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
	NEW_FFLAGS="${NEW_FFLAGS} -O2"
	fi
	if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
	NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
	fi

	set +f # re-enable pathname expansion

	export CFLAGS="${NEW_CFLAGS}"
	export CXXFLAGS="${NEW_CXXFLAGS}"
	export FFLAGS="${NEW_FFLAGS}"
	export FCFLAGS="${NEW_FCFLAGS}"
	return 0
	}

	test-flag-PROG() {
	local comp=$1
	local flags="$2"

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

	local PROG=$(tc-get${comp})
	${PROG} ${flags} -S -o /dev/null -xc /dev/null \
	> /dev/null 2>&1
	}

	# @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" "$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" "$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" "$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" "$1"; }

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

	shift

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

	x=""
	for x in "$@" ; do
	test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
	done

	echo "${flags}"

	# Just bail if we dont have any flags
	[[ -n ${flags} ]]
	}

	# @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_flag
	# @DESCRIPTION:
	# DEPRICIATED, use test-flags()
	test_flag() {
	ewarn "test_flag: deprecated, please use test-flags()!" >&2

	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 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 f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
	if [ "${f/${findflag}}" != "${f}" ] ; then
	printf "%s\n" "${f/-${findflag}=}"
	return 0
	fi
	done
	return 1
	}

	# @FUNCTION: has_hardened
	# @DESCRIPTION:
	# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
	has_hardened() {
	ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2

	test_version_info Hardened && return 0
	# The specs file wont exist unless gcc has GCC_SPECS support
	[[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
	}

	# @FUNCTION: has_pic
	# @DESCRIPTION:
	# DEPRECATED - use gcc-specs-pie from toolchain-funcs
	# indicate whether PIC is set
	has_pic() {
	ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2

	[[ ${CFLAGS/-fPIC} != ${CFLAGS} \|\| \
	${CFLAGS/-fpic} != ${CFLAGS} ]] \|\| \
	gcc-specs-pie
	}

	# @FUNCTION: has_pie
	# @DESCRIPTION:
	# DEPRECATED - use gcc-specs-pie from toolchain-funcs
	# indicate whether PIE is set
	has_pie() {
	ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2

	[[ ${CFLAGS/-fPIE} != ${CFLAGS} \|\| \
	${CFLAGS/-fpie} != ${CFLAGS} ]] \|\| \
	gcc-specs-pie
	}

	# @FUNCTION: has_ssp_all
	# @DESCRIPTION:
	# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
	# indicate whether code for SSP is being generated for all functions
	has_ssp_all() {
	ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2

	# note; this matches only -fstack-protector-all
	[[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} \|\| \
	-n $(echo \| $(tc-getCC) ${CFLAGS} -E -dM - \| grep __SSP_ALL__) ]] \|\| \
	gcc-specs-ssp-to-all
	}

	# @FUNCTION: has_ssp
	# @DESCRIPTION:
	# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
	# indicate whether code for SSP is being generated
	has_ssp() {
	ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2

	# note; this matches both -fstack-protector and -fstack-protector-all
	[[ ${CFLAGS/-fstack-protector} != ${CFLAGS} \|\| \
	-n $(echo \| $(tc-getCC) ${CFLAGS} -E -dM - \| grep __SSP__) ]] \|\| \
	gcc-specs-ssp
	}

	# @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() {
	# 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
	}

	# @FUNCTION: has_m32
	# @DESCRIPTION:
	# This doesn't test if the flag is accepted, it tests if the flag actually
	# WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
	# code is 0, else return code is 1.
	has_m32() {
	# 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!

	[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0

	local temp=$(emktemp)
	echo "int main() { return(0); }" > "${temp}".c
	MY_CC=$(tc-getCC)
	${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
	local ret=$?
	rm -f "${temp}".c
	[[ ${ret} != 1 ]] && return 0
	return 1
	}

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

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

	# @FUNCTION: filter-ldflags
	# @USAGE: <flags>
	# @DESCRIPTION:
	# Remove particular <flags> from LDFLAGS. Accepts shell globs.
	filter-ldflags() {
	_filter-var LDFLAGS "$@"
	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,'.
	raw-ldflags() {
	local x input="$@"
	[[ -z ${input} ]] && input=${LDFLAGS}
	set --
	for x in ${input} ; do
	x=${x#-Wl,}
	set -- "$@" ${x//,/ }
	done
	echo "$@"
	}

	# @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
	}

	# Some tests for when we screw with things and want to make
	# sure we didn't break anything
	#TESTS() {
	# CFLAGS="-a -b -c=1"
	# CXXFLAGS="-x -y -z=2"
	# LDFLAGS="-l -m -n=3"
	#
	# die() { exit 1; }
	# (is-flag 1 2 3) && die
	# (is-ldflag 1 2 3) && die
	#
	# is-flagq -l && die
	# is-ldflagq -a && die
	# is-flagq -a \|\| die
	# is-flagq -x \|\| die
	# is-ldflagq -n=* \|\| die
	# is-ldflagq -n && die
	#
	# strip-unsupported-flags
	# [[ ${CFLAGS} == "-c=1" ]] \|\| die
	# [[ ${CXXFLAGS} == "-y -z=2" ]] \|\| die
	#
	# echo "All tests pass"
	#}
	#TESTS