# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/toolchain.eclass,v 1.482 2011/11/22 15:20:48 vapier Exp $
#
# Maintainer: Toolchain Ninjas <toolchain@gentoo.org>

#---->> eclass stuff <<----
HOMEPAGE="http://gcc.gnu.org/"
LICENSE="GPL-2 LGPL-2.1"
RESTRICT="strip" # cross-compilers need controlled stripping

inherit eutils versionator libtool toolchain-funcs flag-o-matic gnuconfig multilib fixheadtails

EXPORT_FUNCTIONS pkg_setup src_unpack src_compile src_test pkg_preinst src_install pkg_postinst pkg_prerm pkg_postrm
DESCRIPTION="Based on the ${ECLASS} eclass"

FEATURES=${FEATURES/multilib-strict/}
#----<< eclass stuff >>----


#---->> globals <<----
export CTARGET=${CTARGET:-${CHOST}}
if [[ ${CTARGET} = ${CHOST} ]] ; then
	if [[ ${CATEGORY/cross-} != ${CATEGORY} ]] ; then
		export CTARGET=${CATEGORY/cross-}
	fi
fi
is_crosscompile() {
	[[ ${CHOST} != ${CTARGET} ]]
}

tc_version_is_at_least() { version_is_at_least "$1" "${2:-${GCC_RELEASE_VER}}" ; }

GCC_PV=${TOOLCHAIN_GCC_PV:-${PV}}
GCC_PVR=${GCC_PV}
[[ ${PR} != "r0" ]] && GCC_PVR=${GCC_PVR}-${PR}
GCC_RELEASE_VER=$(get_version_component_range 1-3 ${GCC_PV})
GCC_BRANCH_VER=$(get_version_component_range 1-2 ${GCC_PV})
GCCMAJOR=$(get_version_component_range 1 ${GCC_PV})
GCCMINOR=$(get_version_component_range 2 ${GCC_PV})
GCCMICRO=$(get_version_component_range 3 ${GCC_PV})
[[ ${BRANCH_UPDATE-notset} == "notset" ]] && BRANCH_UPDATE=$(get_version_component_range 4 ${GCC_PV})

# According to gcc/c-cppbuiltin.c, GCC_CONFIG_VER MUST match this regex.
# ([^0-9]*-)?[0-9]+[.][0-9]+([.][0-9]+)?([- ].*)?
GCC_CONFIG_VER=${GCC_CONFIG_VER:-$(replace_version_separator 3 '-' ${GCC_PV})}

# Pre-release support
if [[ ${GCC_PV} != ${GCC_PV/_pre/-} ]] ; then
	PRERELEASE=${GCC_PV/_pre/-}
fi
# make _alpha and _beta ebuilds automatically use a snapshot
if [[ ${GCC_PV} == *_alpha* ]] ; then
	SNAPSHOT=${GCC_BRANCH_VER}-${GCC_PV##*_alpha}
elif [[ ${GCC_PV} == *_beta* ]] ; then
	SNAPSHOT=${GCC_BRANCH_VER}-${GCC_PV##*_beta}
elif [[ ${GCC_PV} == *_rc* ]] ; then
	SNAPSHOT=${GCC_PV%_rc*}-RC-${GCC_PV##*_rc}
fi
export GCC_FILESDIR=${GCC_FILESDIR:-${FILESDIR}}

PREFIX=${TOOLCHAIN_PREFIX:-/usr}

if tc_version_is_at_least 3.4.0 ; then
	LIBPATH=${TOOLCHAIN_LIBPATH:-${PREFIX}/lib/gcc/${CTARGET}/${GCC_CONFIG_VER}}
else
	LIBPATH=${TOOLCHAIN_LIBPATH:-${PREFIX}/lib/gcc-lib/${CTARGET}/${GCC_CONFIG_VER}}
fi
INCLUDEPATH=${TOOLCHAIN_INCLUDEPATH:-${LIBPATH}/include}
if is_crosscompile ; then
	BINPATH=${TOOLCHAIN_BINPATH:-${PREFIX}/${CHOST}/${CTARGET}/gcc-bin/${GCC_CONFIG_VER}}
else
	BINPATH=${TOOLCHAIN_BINPATH:-${PREFIX}/${CTARGET}/gcc-bin/${GCC_CONFIG_VER}}
fi
DATAPATH=${TOOLCHAIN_DATAPATH:-${PREFIX}/share/gcc-data/${CTARGET}/${GCC_CONFIG_VER}}
# Dont install in /usr/include/g++-v3/, but in gcc internal directory.
# We will handle /usr/include/g++-v3/ with gcc-config ...
STDCXX_INCDIR=${TOOLCHAIN_STDCXX_INCDIR:-${LIBPATH}/include/g++-v${GCC_BRANCH_VER/\.*/}}

#----<< globals >>----


#---->> SLOT+IUSE logic <<----
IUSE="build multislot nls nptl test vanilla"

if [[ ${PN} != "kgcc64" && ${PN} != gcc-* ]] ; then
	IUSE+=" altivec cxx fortran nocxx"
	[[ -n ${PIE_VER} ]] && IUSE+=" nopie"
	[[ -n ${HTB_VER} ]] && IUSE+=" boundschecking"
	[[ -n ${D_VER}   ]] && IUSE+=" d"
	[[ -n ${PP_VER}${SPECS_VER} ]] && IUSE+=" nossp"

	if tc_version_is_at_least 3 ; then
		IUSE+=" bootstrap doc gcj gtk hardened libffi multilib objc"

		tc_version_is_at_least "4.0" && IUSE+=" objc-gc mudflap"
		tc_version_is_at_least "4.1" && IUSE+=" objc++"
		tc_version_is_at_least "4.2" && IUSE+=" openmp"
		tc_version_is_at_least "4.3" && IUSE+=" fixed-point"
		tc_version_is_at_least "4.4" && IUSE+=" graphite"
		[[ ${GCC_BRANCH_VER} == 4.5 ]] && IUSE+=" lto"
		tc_version_is_at_least "4.6" && IUSE+=" go"
	fi
fi

# Support upgrade paths here or people get pissed
if use multislot ; then
	SLOT="${CTARGET}-${GCC_CONFIG_VER}"
elif is_crosscompile; then
	SLOT="${CTARGET}-${GCC_BRANCH_VER}"
else
	SLOT="${GCC_BRANCH_VER}"
fi
#----<< SLOT+IUSE logic >>----

#---->> DEPEND <<----

RDEPEND="sys-libs/zlib
	!build? (
		nls? ( sys-devel/gettext )
	)"
if tc_version_is_at_least 3 ; then
	RDEPEND+=" virtual/libiconv"
fi
if tc_version_is_at_least 4 ; then
	GMP_MPFR_DEPS=">=dev-libs/gmp-4.3.2 >=dev-libs/mpfr-2.4.2"
	if tc_version_is_at_least 4.3 ; then
		RDEPEND+=" ${GMP_MPFR_DEPS}"
	elif in_iuse fortran ; then
		RDEPEND+=" fortran? ( ${GMP_MPFR_DEPS} )"
	fi
	if tc_version_is_at_least 4.5 ; then
		RDEPEND+=" >=dev-libs/mpc-0.8.1"
	fi
	in_iuse lto && RDEPEND+=" lto? ( || ( >=dev-libs/elfutils-0.143 dev-libs/libelf ) )"
fi
if in_iuse graphite ; then
	RDEPEND+="
	    graphite? (
	        >=dev-libs/cloog-ppl-0.15.10
	        >=dev-libs/ppl-0.10
	    )"
fi

DEPEND="${RDEPEND}
	>=sys-apps/texinfo-4.8
	>=sys-devel/bison-1.875
	>=sys-devel/flex-2.5.4
	test? (
		>=dev-util/dejagnu-1.4.4
		>=sys-devel/autogen-5.5.4
	)"
if in_iuse gcj ; then
	GCJ_GTK_DEPS="
		x11-libs/libXt
		x11-libs/libX11
		x11-libs/libXtst
		x11-proto/xproto
		x11-proto/xextproto
		=x11-libs/gtk+-2*"
	tc_version_is_at_least 3.4 && GCJ_GTK_DEPS+=" x11-libs/pango"
	GCJ_DEPS=">=media-libs/libart_lgpl-2.1"
	tc_version_is_at_least 4.2 && GCJ_DEPS+=" app-arch/zip app-arch/unzip"
	DEPEND+=" gcj? ( gtk? ( ${GCJ_GTK_DEPS} ) ${GCJ_DEPS} )"
fi

PDEPEND=">=sys-devel/gcc-config-1.4"

#----<< DEPEND >>----

#---->> S + SRC_URI essentials <<----

# This function sets the source directory depending on whether we're using
# a prerelease, snapshot, or release tarball.
gcc_get_s_dir() {
	local GCC_S
	if [[ -n ${PRERELEASE} ]] ; then
		GCC_S=${WORKDIR}/gcc-${PRERELEASE}
	elif [[ -n ${SNAPSHOT} ]] ; then
		GCC_S=${WORKDIR}/gcc-${SNAPSHOT}
	else
		GCC_S=${WORKDIR}/gcc-${GCC_RELEASE_VER}
	fi
	echo "${GCC_S}"
}
S=$(gcc_get_s_dir)

# This function handles the basics of setting the SRC_URI for a gcc ebuild.
# To use, set SRC_URI with:
#
#	SRC_URI="$(get_gcc_src_uri)"
#
# Other than the variables normally set by portage, this function's behavior
# can be altered by setting the following:
#
#	SNAPSHOT
#			If set, this variable signals that we should be using a snapshot
#			of gcc from ftp://sources.redhat.com/pub/gcc/snapshots/. It is
#			expected to be in the format "YYYY-MM-DD". Note that if the ebuild
#			has a _pre suffix, this variable is ignored and the prerelease
#			tarball is used instead.
#
#	BRANCH_UPDATE
#			If set, this variable signals that we should be using the main
#			release tarball (determined by ebuild version) and applying a
#			CVS branch update patch against it. The location of this branch
#			update patch is assumed to be in ${GENTOO_TOOLCHAIN_BASE_URI}.
#			Just like with SNAPSHOT, this variable is ignored if the ebuild
#			has a _pre suffix.
#
#	PATCH_VER
#	PATCH_GCC_VER
#			This should be set to the version of the gentoo patch tarball.
#			The resulting filename of this tarball will be:
#			gcc-${PATCH_GCC_VER:-${GCC_RELEASE_VER}}-patches-${PATCH_VER}.tar.bz2
#
#	PIE_VER
#	PIE_GCC_VER
#	obsoleted: PIE_CORE
#			These variables control patching in various updates for the logic
#			controlling Position Independant Executables. PIE_VER is expected
#			to be the version of this patch, PIE_GCC_VER the gcc version of
#			the patch, and PIE_CORE (obsoleted) the actual filename of the patch.
#			An example:
#					PIE_VER="8.7.6.5"
#					PIE_GCC_VER="3.4.0"
#			The resulting filename of this tarball will be:
#			gcc-${PIE_GCC_VER:-${GCC_RELEASE_VER}}-piepatches-v${PIE_VER}.tar.bz2
#				old syntax (do not define PIE_CORE anymore):
#					PIE_CORE="gcc-3.4.0-piepatches-v${PIE_VER}.tar.bz2"
#
#	SPECS_VER
#	SPECS_GCC_VER
#			This is for the minispecs files included in the hardened gcc-4.x
#			The specs files for hardenedno*, vanilla and for building the "specs" file.
#			SPECS_VER is expected to be the version of this patch, SPECS_GCC_VER
#			the gcc version of the patch.
#			An example:
#					SPECS_VER="8.7.6.5"
#					SPECS_GCC_VER="3.4.0"
#			The resulting filename of this tarball will be:
#			gcc-${SPECS_GCC_VER:-${GCC_RELEASE_VER}}-specs-${SPECS_VER}.tar.bz2
#
#	PP_VER
#	PP_GCC_VER
#	obsoleted: PP_FVER
#			These variables control patching in stack smashing protection
#			support. They both control the version of ProPolice to download.
#
#		PP_VER / PP_GCC_VER
#			Used to roll our own custom tarballs of ssp.
#		PP_FVER / PP_VER
#			Used for mirroring ssp straight from IBM.
#			PP_VER sets the version of the directory in which to find the
#			patch, and PP_FVER sets the version of the patch itself. For
#			example:
#					PP_VER="3_4"
#					PP_FVER="${PP_VER//_/.}-2"
#			would download gcc3_4/protector-3.4-2.tar.gz
#
#	HTB_VER
#	HTB_GCC_VER
#			These variables control whether or not an ebuild supports Herman
#			ten Brugge's bounds-checking patches. If you want to use a patch
#			for an older gcc version with a new gcc, make sure you set
#			HTB_GCC_VER to that version of gcc.
#
#	MAN_VER
#			The version of gcc for which we will download manpages. This will
#			default to ${GCC_RELEASE_VER}, but we may not want to pre-generate man pages
#			for prerelease test ebuilds for example. This allows you to
#			continue using pre-generated manpages from the last stable release.
#			If set to "none", this will prevent the downloading of manpages,
#			which is useful for individual library targets.
#
gentoo_urls() {
	local devspace="HTTP~lv/GCC/URI HTTP~eradicator/gcc/URI HTTP~vapier/dist/URI
	HTTP~halcy0n/patches/URI HTTP~zorry/patches/gcc/URI HTTP~dirtyepic/dist/URI"
	devspace=${devspace//HTTP/http:\/\/dev.gentoo.org\/}
	echo mirror://gentoo/$1 ${devspace//URI/$1}
}
get_gcc_src_uri() {
	export PATCH_GCC_VER=${PATCH_GCC_VER:-${GCC_RELEASE_VER}}
	export UCLIBC_GCC_VER=${UCLIBC_GCC_VER:-${PATCH_GCC_VER}}
	export PIE_GCC_VER=${PIE_GCC_VER:-${GCC_RELEASE_VER}}
	export PP_GCC_VER=${PP_GCC_VER:-${GCC_RELEASE_VER}}
	export HTB_GCC_VER=${HTB_GCC_VER:-${GCC_RELEASE_VER}}
	export SPECS_GCC_VER=${SPECS_GCC_VER:-${GCC_RELEASE_VER}}

	# Set where to download gcc itself depending on whether we're using a
	# prerelease, snapshot, or release tarball.
	if [[ -n ${PRERELEASE} ]] ; then
		GCC_SRC_URI="ftp://gcc.gnu.org/pub/gcc/prerelease-${PRERELEASE}/gcc-${PRERELEASE}.tar.bz2"
	elif [[ -n ${SNAPSHOT} ]] ; then
		GCC_SRC_URI="ftp://sources.redhat.com/pub/gcc/snapshots/${SNAPSHOT}/gcc-${SNAPSHOT}.tar.bz2"
	else
		GCC_SRC_URI="mirror://gnu/gcc/gcc-${GCC_PV}/gcc-${GCC_RELEASE_VER}.tar.bz2"
		# we want all branch updates to be against the main release
		[[ -n ${BRANCH_UPDATE} ]] && \
			GCC_SRC_URI="${GCC_SRC_URI} $(gentoo_urls gcc-${GCC_RELEASE_VER}-branch-update-${BRANCH_UPDATE}.patch.bz2)"
	fi

	# propolice aka stack smashing protection
	if [[ -n ${PP_VER} ]] ; then
		if [[ -n ${PP_FVER} ]] ; then
			GCC_SRC_URI="${GCC_SRC_URI}
				!nossp? (
					http://www.research.ibm.com/trl/projects/security/ssp/gcc${PP_VER}/protector-${PP_FVER}.tar.gz
					$(gentoo_urls protector-${PP_FVER}.tar.gz)
				)"
		else
			GCC_SRC_URI="${GCC_SRC_URI} $(gentoo_urls gcc-${PP_GCC_VER}-ssp-${PP_VER}.tar.bz2)"
		fi
	fi

	# uclibc lovin
	[[ -n ${UCLIBC_VER} ]] && \
		GCC_SRC_URI="${GCC_SRC_URI} $(gentoo_urls gcc-${UCLIBC_GCC_VER}-uclibc-patches-${UCLIBC_VER}.tar.bz2)"

	# PERL cannot be present at bootstrap, and is used to build the man pages.
	# So... lets include some pre-generated ones, shall we?
	[[ -n ${MAN_VER} ]] && \
		GCC_SRC_URI="${GCC_SRC_URI} $(gentoo_urls gcc-${MAN_VER}-manpages.tar.bz2)"

	# various gentoo patches
	[[ -n ${PATCH_VER} ]] && \
		GCC_SRC_URI="${GCC_SRC_URI} $(gentoo_urls gcc-${PATCH_GCC_VER}-patches-${PATCH_VER}.tar.bz2)"

	# strawberry pie, Cappuccino and a Gauloises (it's a good thing)
	[[ -n ${PIE_VER} ]] && \
		PIE_CORE=${PIE_CORE:-gcc-${PIE_GCC_VER}-piepatches-v${PIE_VER}.tar.bz2} && \
		GCC_SRC_URI="${GCC_SRC_URI} $(gentoo_urls ${PIE_CORE})"

	# gcc minispec for the hardened gcc 4 compiler
	[[ -n ${SPECS_VER} ]] && \
		GCC_SRC_URI="${GCC_SRC_URI} $(gentoo_urls gcc-${SPECS_GCC_VER}-specs-${SPECS_VER}.tar.bz2)"

	# gcc bounds checking patch
	if [[ -n ${HTB_VER} ]] ; then
		local HTBFILE="bounds-checking-gcc-${HTB_GCC_VER}-${HTB_VER}.patch.bz2"
		GCC_SRC_URI="${GCC_SRC_URI}
			boundschecking? (
				mirror://sourceforge/boundschecking/${HTBFILE}
				$(gentoo_urls ${HTBFILE})
			)"
	fi

	# support for the D language
	[[ -n ${D_VER} ]] && \
		GCC_SRC_URI="${GCC_SRC_URI} d? ( mirror://sourceforge/dgcc/gdc-${D_VER}-src.tar.bz2 )"

	# >= gcc-4.3 uses ecj.jar and we only add gcj as a use flag under certain
	# conditions
	if [[ ${PN} != "kgcc64" && ${PN} != gcc-* ]] ; then
		if tc_version_is_at_least "4.5" ; then
			GCC_SRC_URI="${GCC_SRC_URI}
			gcj? ( ftp://sourceware.org/pub/java/ecj-4.5.jar )"
		elif tc_version_is_at_least "4.3" ; then
			GCC_SRC_URI="${GCC_SRC_URI}
			gcj? ( ftp://sourceware.org/pub/java/ecj-4.3.jar )"
		fi
	fi

	echo "${GCC_SRC_URI}"
}
SRC_URI=$(get_gcc_src_uri)
#---->> S + SRC_URI essentials >>----


#---->> support checks <<----

# Grab a variable from the build system (taken from linux-info.eclass)
get_make_var() {
	local var=$1 makefile=${2:-${WORKDIR}/build/Makefile}
	echo -e "e:\\n\\t@echo \$(${var})\\ninclude ${makefile}" | \
		r=${makefile%/*} emake --no-print-directory -s -f - 2>/dev/null
}
XGCC() { get_make_var GCC_FOR_TARGET ; }

# The gentoo piessp patches allow for 3 configurations:
# 1) PIE+SSP by default
# 2) PIE by default
# 3) SSP by default
hardened_gcc_works() {
	if [[ $1 == "pie" ]] ; then
		# $gcc_cv_ld_pie is unreliable as it simply take the output of
		# `ld --help | grep -- -pie`, that reports the option in all cases, also if
		# the loader doesn't actually load the resulting executables.
		# To avoid breakage, blacklist FreeBSD here at least
		[[ ${CTARGET} == *-freebsd* ]] && return 1

		want_pie || return 1
		tc_version_is_at_least 4.3.2 && use nopie && return 1
		hardened_gcc_is_stable pie && return 0
		if has "~$(tc-arch)" ${ACCEPT_KEYWORDS} ; then
			hardened_gcc_check_unsupported pie && return 1
			ewarn "Allowing pie-by-default for an unstable arch ($(tc-arch))"
			return 0
		fi
		return 1
	elif [[ $1 == "ssp" ]] ; then
		[[ -n ${PP_VER} ]] || [[ -n ${SPECS_VER} ]] || return 1
		tc_version_is_at_least 4.3.2 && use nossp && return 1
		hardened_gcc_is_stable ssp && return 0
		if has "~$(tc-arch)" ${ACCEPT_KEYWORDS} ; then
			hardened_gcc_check_unsupported ssp && return 1
			ewarn "Allowing ssp-by-default for an unstable arch ($(tc-arch))"
			return 0
		fi
		return 1
	else
		# laziness ;)
		hardened_gcc_works pie || return 1
		hardened_gcc_works ssp || return 1
		return 0
	fi
}

hardened_gcc_is_stable() {
	if [[ $1 == "pie" ]] ; then
		# HARDENED_* variables are deprecated and here for compatibility
		local tocheck="${HARDENED_PIE_WORKS} ${HARDENED_GCC_WORKS}"
		if [[ ${CTARGET} == *-uclibc* ]] ; then
			tocheck="${tocheck} ${PIE_UCLIBC_STABLE}"
		else
			tocheck="${tocheck} ${PIE_GLIBC_STABLE}"
		fi
	elif [[ $1 == "ssp" ]] ; then
		# ditto
		local tocheck="${HARDENED_SSP_WORKS} ${HARDENED_GCC_WORKS}"
		if [[ ${CTARGET} == *-uclibc* ]] ; then
			tocheck="${tocheck} ${SSP_UCLIBC_STABLE}"
		else
			tocheck="${tocheck} ${SSP_STABLE}"
		fi
	else
		die "hardened_gcc_stable needs to be called with pie or ssp"
	fi

	has $(tc-arch) ${tocheck} && return 0
	return 1
}

hardened_gcc_check_unsupported() {
	local tocheck=""
	# if a variable is unset, we assume that all archs are unsupported. since
	# this function is never called if hardened_gcc_is_stable returns true,
	# this shouldn't cause problems... however, allowing this logic to work
	# even with the variables unset will break older ebuilds that dont use them.
	if [[ $1 == "pie" ]] ; then
		if [[ ${CTARGET} == *-uclibc* ]] ; then
			[[ -z ${PIE_UCLIBC_UNSUPPORTED} ]] && return 0
			tocheck="${tocheck} ${PIE_UCLIBC_UNSUPPORTED}"
		else
			[[ -z ${PIE_GLIBC_UNSUPPORTED} ]] && return 0
			tocheck="${tocheck} ${PIE_GLIBC_UNSUPPORTED}"
		fi
	elif [[ $1 == "ssp" ]] ; then
		if [[ ${CTARGET} == *-uclibc* ]] ; then
			[[ -z ${SSP_UCLIBC_UNSUPPORTED} ]] && return 0
			tocheck="${tocheck} ${SSP_UCLIBC_UNSUPPORTED}"
		else
			[[ -z ${SSP_UNSUPPORTED} ]] && return 0
			tocheck="${tocheck} ${SSP_UNSUPPORTED}"
		fi
	else
		die "hardened_gcc_check_unsupported needs to be called with pie or ssp"
	fi

	has $(tc-arch) ${tocheck} && return 0
	return 1
}

has_libssp() {
	[[ -e /$(get_libdir)/libssp.so ]] && return 0
	return 1
}

want_libssp() {
	[[ ${GCC_LIBSSP_SUPPORT} == "true" ]] || return 1
	has_libssp || return 1
	[[ -n ${PP_VER} ]] || return 1
	return 0
}

_want_stuff() {
	local var=$1 flag=$2
	[[ -z ${!var} ]] && return 1
	use ${flag} && return 0
	return 1
}
want_boundschecking() { _want_stuff HTB_VER boundschecking ; }
want_pie() {
	! use hardened && [[ -n ${PIE_VER} ]] && use nopie && return 1
	[[ -n ${PIE_VER} ]] && [[ -n ${SPECS_VER} ]] && return 0
	tc_version_is_at_least 4.3.2 && return 1
	_want_stuff PIE_VER !nopie
}
want_ssp() { _want_stuff PP_VER !nossp ; }

# SPLIT_SPECS are deprecated for >=GCC 4.4
want_split_specs() {
	tc_version_is_at_least 4.4 && return 1
	[[ ${SPLIT_SPECS} == "true" ]] && want_pie
}
want_minispecs() {
	if tc_version_is_at_least 4.3.2 && use hardened ; then
		if ! want_pie ; then
			ewarn "PIE_VER or SPECS_VER is not defiend in the GCC ebuild."
		elif use vanilla ; then
			ewarn "You will not get hardened features if you have the vanilla USE-flag."
		elif use nopie && use nossp ; then
			ewarn "You will not get hardened features if you have the nopie and nossp USE-flag."
		elif ! hardened_gcc_works pie && ! hardened_gcc_works ssp && ! use nopie ; then
			ewarn "Your $(tc-arch) arch is not supported."
		else
			return 0
		fi
		ewarn "Hope you know what you are doing. Hardened will not work."
		return 0
	fi
	return 1
}
# This function checks whether or not glibc has the support required to build
# Position Independant Executables with gcc.
glibc_have_pie() {
	if [[ ! -f ${ROOT}/usr/$(get_libdir)/Scrt1.o ]] ; then
		echo
		ewarn "Your glibc does not have support for pie, the file Scrt1.o is missing"
		ewarn "Please update your glibc to a proper version or disable hardened"
		echo
		return 1
	fi
}

# This function determines whether or not libc has been patched with stack
# smashing protection support.
libc_has_ssp() {
	[[ ${ROOT} != "/" ]] && return 0

	# lib hacks taken from sandbox configure
	echo 'int main(){}' > "${T}"/libctest.c
	LC_ALL=C gcc "${T}"/libctest.c -lc -o libctest -Wl,-verbose &> "${T}"/libctest.log || return 1
	local libc_file=$(awk '/attempt to open/ { if (($4 ~ /\/libc\.so/) && ($5 == "succeeded")) LIBC = $4; }; END {print LIBC}' "${T}"/libctest.log)

	[[ -z ${libc_file} ]] && die "Unable to find a libc !?"

	# Check for gcc-4.x style ssp support
	if	[[ -n $(readelf -s "${libc_file}" 2>/dev/null | \
				grep 'FUNC.*GLOBAL.*__stack_chk_fail') ]]
	then
		return 0
	else
		# Check for gcc-3.x style ssp support
		if	[[ -n $(readelf -s "${libc_file}" 2>/dev/null | \
					grep 'OBJECT.*GLOBAL.*__guard') ]] && \
			[[ -n $(readelf -s "${libc_file}" 2>/dev/null | \
					grep 'FUNC.*GLOBAL.*__stack_smash_handler') ]]
		then
			return 0
		elif is_crosscompile ; then
			die "'${libc_file}' was detected w/out ssp, that sucks (a lot)"
		else
			return 1
		fi
	fi
}

# This is to make sure we don't accidentally try to enable support for a
# language that doesnt exist. GCC 3.4 supports f77, while 4.0 supports f95, etc.
#
# Also add a hook so special ebuilds (kgcc64) can control which languages
# exactly get enabled
gcc-lang-supported() {
	grep ^language=\"${1}\" "${S}"/gcc/*/config-lang.in > /dev/null || return 1
	[[ -z ${TOOLCHAIN_ALLOWED_LANGS} ]] && return 0
	has $1 ${TOOLCHAIN_ALLOWED_LANGS}
}

#----<< support checks >>----

#---->> specs + env.d logic <<----

# defaults to enable for all hardened toolchains
gcc_common_hard="-DEFAULT_RELRO -DEFAULT_BIND_NOW"

# configure to build with the hardened GCC specs as the default
make_gcc_hard() {
	if hardened_gcc_works ; then
		einfo "Updating gcc to use automatic PIE + SSP building ..."
		sed -e "s|^HARD_CFLAGS = |HARD_CFLAGS = -DEFAULT_PIE_SSP ${gcc_common_hard} |" \
			-i "${S}"/gcc/Makefile.in || die "Failed to update gcc!"
	elif hardened_gcc_works pie ; then
		einfo "Updating gcc to use automatic PIE building ..."
		ewarn "SSP has not been enabled by default"
		sed -e "s|^HARD_CFLAGS = |HARD_CFLAGS = -DEFAULT_PIE ${gcc_common_hard} |" \
			-i "${S}"/gcc/Makefile.in || die "Failed to update gcc!"
	elif hardened_gcc_works ssp ; then
		einfo "Updating gcc to use automatic SSP building ..."
		ewarn "PIE has not been enabled by default"
		sed -e "s|^HARD_CFLAGS = |HARD_CFLAGS = -DEFAULT_SSP ${gcc_common_hard} |" \
			-i "${S}"/gcc/Makefile.in || die "Failed to update gcc!"
	else
		# do nothing if hardened isnt supported, but dont die either
		ewarn "hardened is not supported for this arch in this gcc version"
		ebeep
		return 0
	fi

	# rebrand to make bug reports easier
	BRANDING_GCC_PKGVERSION=${BRANDING_GCC_PKGVERSION/Gentoo/Gentoo Hardened}
}

# now we generate different spec files so that the user can select a compiler
# that enforces certain features in gcc itself and so we don't have to worry
# about a certain package ignoring CFLAGS/LDFLAGS
_create_specs_file() {
	# Usage: _create_specs_file <USE flag> <specs name> <CFLAGS>
	local uflag=$1 name=$2 flags=${*:3}
	ebegin "Creating a ${name} gcc specs file"
	pushd "${WORKDIR}"/build/gcc > /dev/null
	if [[ -z ${uflag} ]] || use ${uflag} ; then
		# backup the compiler first
		cp Makefile Makefile.orig
		sed -i -e '/^HARD_CFLAGS/s:=.*:='"${flags}"':' Makefile
		mv xgcc xgcc.foo
		mv gcc.o gcc.o.foo
		emake -s xgcc
		$(XGCC) -dumpspecs > "${WORKDIR}"/build/${name}.specs
		# restore everything to normal
		mv gcc.o.foo gcc.o
		mv xgcc.foo xgcc
		mv Makefile.orig Makefile
	else
		$(XGCC) -dumpspecs > "${WORKDIR}"/build/${name}.specs
	fi
	popd > /dev/null
	eend $([[ -s ${WORKDIR}/build/${name}.specs ]] ; echo $?)
}
create_vanilla_specs_file()			 { _create_specs_file hardened vanilla ; }
create_hardened_specs_file()		 { _create_specs_file !hardened hardened  ${gcc_common_hard} -DEFAULT_PIE_SSP ; }
create_hardenednossp_specs_file()	 { _create_specs_file "" hardenednossp	  ${gcc_common_hard} -DEFAULT_PIE ; }
create_hardenednopie_specs_file()	 { _create_specs_file "" hardenednopie	  ${gcc_common_hard} -DEFAULT_SSP ; }
create_hardenednopiessp_specs_file() { _create_specs_file "" hardenednopiessp ${gcc_common_hard} ; }

split_out_specs_files() {
	local s spec_list="hardenednopiessp vanilla"
	if hardened_gcc_works ; then
		spec_list="${spec_list} hardened hardenednossp hardenednopie"
	elif hardened_gcc_works pie ; then
		spec_list="${spec_list} hardenednossp"
	elif hardened_gcc_works ssp ; then
		spec_list="${spec_list} hardenednopie"
	fi
	for s in ${spec_list} ; do
		create_${s}_specs_file || return 1
	done
}

create_gcc_env_entry() {
	dodir /etc/env.d/gcc
	local gcc_envd_base="/etc/env.d/gcc/${CTARGET}-${GCC_CONFIG_VER}"

	if [[ -z $1 ]] ; then
		gcc_envd_file="${D}${gcc_envd_base}"
		# I'm leaving the following commented out to remind me that it
		# was an insanely -bad- idea. Stuff broke. GCC_SPECS isnt unset
		# on chroot or in non-toolchain.eclass gcc ebuilds!
		#gcc_specs_file="${LIBPATH}/specs"
		gcc_specs_file=""
	else
		gcc_envd_file="${D}${gcc_envd_base}-$1"
		gcc_specs_file="${LIBPATH}/$1.specs"
	fi

	# phase PATH/ROOTPATH out ...
	echo "PATH=\"${BINPATH}\"" > ${gcc_envd_file}
	echo "ROOTPATH=\"${BINPATH}\"" >> ${gcc_envd_file}
	echo "GCC_PATH=\"${BINPATH}\"" >> ${gcc_envd_file}

	if is_multilib ; then
		LDPATH="${LIBPATH}"
		for path in 32 64 ; do
			[[ -d ${D}${LIBPATH}/${path} ]] && LDPATH="${LDPATH}:${LIBPATH}/${path}"
		done
	else
		local MULTIDIR
		LDPATH="${LIBPATH}"

		# We want to list the default ABI's LIBPATH first so libtool
		# searches that directory first.  This is a temporary
		# workaround for libtool being stupid and using .la's from
		# conflicting ABIs by using the first one in the search path

		local abi=${DEFAULT_ABI}
		local MULTIDIR=$($(XGCC) $(get_abi_CFLAGS ${abi}) --print-multi-directory)
		if [[ ${MULTIDIR} == "." ]] ; then
			LDPATH=${LIBPATH}
		else
			LDPATH=${LIBPATH}/${MULTIDIR}
		fi

		for abi in $(get_all_abis) ; do
			[[ ${abi} == ${DEFAULT_ABI} ]] && continue

			MULTIDIR=$($(XGCC) $(get_abi_CFLAGS ${abi}) --print-multi-directory)
			if [[ ${MULTIDIR} == "." ]] ; then
				LDPATH=${LDPATH}:${LIBPATH}
			else
				LDPATH=${LDPATH}:${LIBPATH}/${MULTIDIR}
			fi
		done
	fi

	echo "LDPATH=\"${LDPATH}\"" >> ${gcc_envd_file}
	echo "MANPATH=\"${DATAPATH}/man\"" >> ${gcc_envd_file}
	echo "INFOPATH=\"${DATAPATH}/info\"" >> ${gcc_envd_file}
	echo "STDCXX_INCDIR=\"${STDCXX_INCDIR##*/}\"" >> ${gcc_envd_file}

	is_crosscompile && echo "CTARGET=${CTARGET}" >> ${gcc_envd_file}

	# Set which specs file to use
	[[ -n ${gcc_specs_file} ]] && echo "GCC_SPECS=\"${gcc_specs_file}\"" >> ${gcc_envd_file}
}
setup_minispecs_gcc_build_specs() {
	# Setup the "build.specs" file for gcc 4.3 to use when building.
	if hardened_gcc_works pie ; then
		cat "${WORKDIR}"/specs/pie.specs >> "${WORKDIR}"/build.specs
	fi
	if hardened_gcc_works ssp ; then
		for s in ssp sspall ; do
			cat "${WORKDIR}"/specs/${s}.specs >> "${WORKDIR}"/build.specs
		done
	fi
	for s in nostrict znow ; do
		cat "${WORKDIR}"/specs/${s}.specs >> "${WORKDIR}"/build.specs
	done
	export GCC_SPECS="${WORKDIR}"/build.specs
}
copy_minispecs_gcc_specs() {
	# setup the hardenedno* specs files and the vanilla specs file.
	if hardened_gcc_works ; then
		create_gcc_env_entry hardenednopiessp
	fi
	if hardened_gcc_works pie ; then
		create_gcc_env_entry hardenednopie
	fi
	if hardened_gcc_works ssp ; then
		create_gcc_env_entry hardenednossp
	fi
	create_gcc_env_entry vanilla
	insinto ${LIBPATH}
	doins "${WORKDIR}"/specs/*.specs || die "failed to install specs"
	# Build system specs file which, if it exists, must be a complete set of
	# specs as it completely and unconditionally overrides the builtin specs.
	# For gcc 4.3
	if ! tc_version_is_at_least 4.4 ; then
		$(XGCC) -dumpspecs > "${WORKDIR}"/specs/specs
		cat "${WORKDIR}"/build.specs >> "${WORKDIR}"/specs/specs
		doins "${WORKDIR}"/specs/specs || die "failed to install the specs file"
	fi
}

#----<< specs + env.d logic >>----

#---->> pkg_* <<----
toolchain_pkg_setup() {
	# Setup variables which would normally be in the profile
	if is_crosscompile ; then
		multilib_env ${CTARGET}
		if ! is_multilib ; then
			MULTILIB_ABIS=${DEFAULT_ABI}
		fi
	fi

	# we dont want to use the installed compiler's specs to build gcc!
	unset GCC_SPECS

	if ! use_if_iuse cxx ; then
		use_if_iuse go && ewarn 'Go requires a C++ compiler, disabled due to USE="-cxx"'
		use_if_iuse objc++ && ewarn 'Obj-C++ requires a C++ compiler, disabled due to USE="-cxx"'
		use_if_iuse gcj && ewarn 'GCJ requires a C++ compiler, disabled due to USE="-cxx"'
	fi

	want_libssp && libc_has_ssp && \
		die "libssp cannot be used with a glibc that has been patched to provide ssp symbols"
	want_minispecs

	unset LANGUAGES #265283
}

toolchain_pkg_preinst() {
	:
}

toolchain_pkg_postinst() {
	do_gcc_config

	if ! is_crosscompile ; then
		echo
		ewarn "If you have issues with packages unable to locate libstdc++.la,"
		ewarn "then try running 'fix_libtool_files.sh' on the old gcc versions."
		echo
		ewarn "You might want to review the GCC upgrade guide when moving between"
		ewarn "major versions (like 4.2 to 4.3):"
		ewarn "http://www.gentoo.org/doc/en/gcc-upgrading.xml"
		echo
	fi

	# If our gcc-config version doesn't like '-' in it's version string,
	# tell our users that gcc-config will yell at them, but it's all good.
	if ! has_version '>=sys-devel/gcc-config-1.3.10-r1' && [[ ${GCC_CONFIG_VER/-/} != ${GCC_CONFIG_VER} ]] ; then
		ewarn "Your version of gcc-config will issue about having an invalid profile"
		ewarn "when switching to this profile.	It is safe to ignore this warning,"
		ewarn "and this problem has been corrected in >=sys-devel/gcc-config-1.3.10-r1."
	fi

	if ! is_crosscompile && ! use multislot && [[ ${GCCMAJOR}.${GCCMINOR} == 3.4 ]] ; then
		echo
		ewarn "You should make sure to rebuild all your C++ packages when"
		ewarn "upgrading between different versions of gcc.	 For example,"
		ewarn "when moving to gcc-3.4 from gcc-3.3, emerge gentoolkit and run:"
		ewarn "	 # revdep-rebuild --library libstdc++.so.5"
		echo
	fi

	if ! is_crosscompile ; then
		# hack to prevent collisions between SLOT
		[[ ! -d ${ROOT}/$(get_libdir)/rcscripts/awk ]] \
			&& mkdir -p "${ROOT}"/$(get_libdir)/rcscripts/awk
		[[ ! -d ${ROOT}/sbin ]] \
			&& mkdir -p "${ROOT}"/sbin
		cp "${ROOT}/${DATAPATH}"/fixlafiles.awk "${ROOT}"/$(get_libdir)/rcscripts/awk/ || die "installing fixlafiles.awk"
		cp "${ROOT}/${DATAPATH}"/fix_libtool_files.sh "${ROOT}"/sbin/ || die "installing fix_libtool_files.sh"

		[[ ! -d ${ROOT}/usr/bin ]] \
			&& mkdir -p "${ROOT}"/usr/bin
		# Since these aren't critical files and portage sucks with
		# handling of binpkgs, don't require these to be found
		for x in "${ROOT}/${DATAPATH}"/c{89,99} ; do
			if [[ -e ${x} ]]; then
				cp ${x} "${ROOT}"/usr/bin/ || die "installing c89/c99"
			fi
		done
	fi
}

toolchain_pkg_prerm() {
	# Don't let these files be uninstalled #87647
	touch -c "${ROOT}"/sbin/fix_libtool_files.sh \
		"${ROOT}"/$(get_libdir)/rcscripts/awk/fixlafiles.awk
}

toolchain_pkg_postrm() {
	# to make our lives easier (and saner), we do the fix_libtool stuff here.
	# rather than checking SLOT's and trying in upgrade paths, we just see if
	# the common libstdc++.la exists in the ${LIBPATH} of the gcc that we are
	# unmerging.  if it does, that means this was a simple re-emerge.

	# clean up the cruft left behind by cross-compilers
	if is_crosscompile ; then
		if [[ -z $(ls "${ROOT}"/etc/env.d/gcc/${CTARGET}* 2>/dev/null) ]] ; then
			rm -f "${ROOT}"/etc/env.d/gcc/config-${CTARGET}
			rm -f "${ROOT}"/etc/env.d/??gcc-${CTARGET}
			rm -f "${ROOT}"/usr/bin/${CTARGET}-{gcc,{g,c}++}{,32,64}
		fi
		return 0
	fi

	# ROOT isnt handled by the script
	[[ ${ROOT} != "/" ]] && return 0

	if [[ ! -e ${LIBPATH}/libstdc++.so ]] ; then
		# make sure the profile is sane during same-slot upgrade #289403
		do_gcc_config

		einfo "Running 'fix_libtool_files.sh ${GCC_RELEASE_VER}'"
		/sbin/fix_libtool_files.sh ${GCC_RELEASE_VER}
		if [[ -n ${BRANCH_UPDATE} ]] ; then
			einfo "Running 'fix_libtool_files.sh ${GCC_RELEASE_VER}-${BRANCH_UPDATE}'"
			/sbin/fix_libtool_files.sh ${GCC_RELEASE_VER}-${BRANCH_UPDATE}
		fi
	fi

	return 0
}

#---->> pkg_* <<----

#---->> src_* <<----

guess_patch_type_in_dir() {
	[[ -n $(ls "$1"/*.bz2 2>/dev/null) ]] \
		&& EPATCH_SUFFIX="patch.bz2" \
		|| EPATCH_SUFFIX="patch"
}
do_gcc_rename_java_bins() {
	# bug #139918 - conflict between gcc and java-config-2 for ownership of
	# /usr/bin/rmi{c,registry}.	 Done with mv & sed rather than a patch
	# because patches would be large (thanks to the rename of man files),
	# and it's clear from the sed invocations that all that changes is the
	# rmi{c,registry} names to grmi{c,registry} names.
	# Kevin F. Quinn 2006-07-12
	einfo "Renaming jdk executables rmic and rmiregistry to grmic and grmiregistry."
	# 1) Move the man files if present (missing prior to gcc-3.4)
	for manfile in rmic rmiregistry; do
		[[ -f ${S}/gcc/doc/${manfile}.1 ]] || continue
		mv "${S}"/gcc/doc/${manfile}.1 "${S}"/gcc/doc/g${manfile}.1
	done
	# 2) Fixup references in the docs if present (mission prior to gcc-3.4)
	for jfile in gcc/doc/gcj.info gcc/doc/grmic.1 gcc/doc/grmiregistry.1 gcc/java/gcj.texi; do
		[[ -f ${S}/${jfile} ]] || continue
		sed -i -e 's:rmiregistry:grmiregistry:g' "${S}"/${jfile} ||
			die "Failed to fixup file ${jfile} for rename to grmiregistry"
		sed -i -e 's:rmic:grmic:g' "${S}"/${jfile} ||
			die "Failed to fixup file ${jfile} for rename to grmic"
	done
	# 3) Fixup Makefiles to build the changed executable names
	#	 These are present in all 3.x versions, and are the important bit
	#	 to get gcc to build with the new names.
	for jfile in libjava/Makefile.am libjava/Makefile.in gcc/java/Make-lang.in; do
		sed -i -e 's:rmiregistry:grmiregistry:g' "${S}"/${jfile} ||
			die "Failed to fixup file ${jfile} for rename to grmiregistry"
		# Careful with rmic on these files; it's also the name of a directory
		# which should be left unchanged.  Replace occurrences of 'rmic$',
		# 'rmic_' and 'rmic '.
		sed -i -e 's:rmic\([$_ ]\):grmic\1:g' "${S}"/${jfile} ||
			die "Failed to fixup file ${jfile} for rename to grmic"
	done
}
toolchain_src_unpack() {
	export BRANDING_GCC_PKGVERSION="Gentoo ${GCC_PVR}"

	[[ -z ${UCLIBC_VER} ]] && [[ ${CTARGET} == *-uclibc* ]] && die "Sorry, this version does not support uClibc"

	[[ -z ${GCC_SVN} ]] && gcc_quick_unpack
	exclude_gcc_patches

	cd "${S}"

	if ! use vanilla ; then
		if [[ -n ${PATCH_VER} ]] ; then
			guess_patch_type_in_dir "${WORKDIR}"/patch
			EPATCH_MULTI_MSG="Applying Gentoo patches ..." \
			epatch "${WORKDIR}"/patch
			BRANDING_GCC_PKGVERSION="${BRANDING_GCC_PKGVERSION} p${PATCH_VER}"
		fi
		if [[ -n ${UCLIBC_VER} ]] ; then
			guess_patch_type_in_dir "${WORKDIR}"/uclibc
			EPATCH_MULTI_MSG="Applying uClibc patches ..." \
			epatch "${WORKDIR}"/uclibc
		fi
	fi
	do_gcc_HTB_patches
	do_gcc_SSP_patches
	do_gcc_PIE_patches
	epatch_user

	# fail if using pie patches, building hardened, and glibc doesnt have
	# the necessary support
	want_pie && use hardened && glibc_have_pie

	if use hardened ; then
		einfo "updating configuration to build hardened GCC"
		make_gcc_hard || die "failed to make gcc hard"
	fi

	if is_libffi ; then
		# move the libffi target out of gcj and into all
		sed -i \
			-e '/^libgcj=/s:target-libffi::' \
			-e '/^target_lib/s:=":="target-libffi :' \
			"${S}"/configure || die
	fi

	# protoize don't build on FreeBSD, skip it
	## removed in 4.5, bug #270558 --de.
	if [[ ${GCCMAJOR}.${GCCMINOR} < 4.5 ]]; then
		if ! is_crosscompile && ! use elibc_FreeBSD ; then
			# enable protoize / unprotoize
			sed -i -e '/^LANGUAGES =/s:$: proto:' "${S}"/gcc/Makefile.in
		fi
	fi

	# No idea when this first started being fixed, but let's go with 4.3.x for now
	if ! tc_version_is_at_least 4.3 ; then
		fix_files=""
		for x in contrib/test_summary libstdc++-v3/scripts/check_survey.in ; do
			[[ -e ${x} ]] && fix_files="${fix_files} ${x}"
		done
		ht_fix_file ${fix_files} */configure *.sh */Makefile.in
	fi

	setup_multilib_osdirnames

	gcc_version_patch
	if [[ ${GCCMAJOR}.${GCCMINOR} > 4.0 ]] ; then
		if [[ -n ${SNAPSHOT} || -n ${PRERELEASE} || -n ${GCC_SVN} ]] ; then
			echo ${PV/_/-} > "${S}"/gcc/BASE-VER
		fi
	fi

	# >= gcc-4.3 doesn't bundle ecj.jar, so copy it
	if [[ ${GCCMAJOR}.${GCCMINOR} > 4.2 ]] && use gcj ; then
		if tc_version_is_at_least "4.5" ; then
			einfo "Copying ecj-4.5.jar"
			cp -pPR "${DISTDIR}/ecj-4.5.jar" "${S}/ecj.jar" || die
		elif tc_version_is_at_least "4.3" ; then
			einfo "Copying ecj-4.3.jar"
			cp -pPR "${DISTDIR}/ecj-4.3.jar" "${S}/ecj.jar" || die
		fi
	fi

	# disable --as-needed from being compiled into gcc specs
	# natively when using a gcc version < 3.4.4
	# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14992
	if ! tc_version_is_at_least 3.4.4 ; then
		sed -i -e s/HAVE_LD_AS_NEEDED/USE_LD_AS_NEEDED/g "${S}"/gcc/config.in
	fi

	# In gcc 3.3.x and 3.4.x, rename the java bins to gcc-specific names
	# in line with gcc-4.
	if [[ ${GCCMAJOR} == 3 ]] &&
	   [[ ${GCCMINOR} -ge 3 ]]
	then
		do_gcc_rename_java_bins
	fi

	# Fixup libtool to correctly generate .la files with portage
	cd "${S}"
	elibtoolize --portage --shallow --no-uclibc

	gnuconfig_update

	# update configure files
	local f
	einfo "Fixing misc issues in configure files"
	tc_version_is_at_least 4.1 && epatch "${GCC_FILESDIR}"/gcc-configure-texinfo.patch
	for f in $(grep -l 'autoconf version 2.13' $(find "${S}" -name configure)) ; do
		ebegin "  Updating ${f/${S}\/} [LANG]"
		patch "${f}" "${GCC_FILESDIR}"/gcc-configure-LANG.patch >& "${T}"/configure-patch.log \
			|| eerror "Please file a bug about this"
		eend $?
	done
	sed -i 's|A-Za-z0-9|[:alnum:]|g' "${S}"/gcc/*.awk #215828

	if [[ -x contrib/gcc_update ]] ; then
		einfo "Touching generated files"
		./contrib/gcc_update --touch | \
			while read f ; do
				einfo "  ${f%%...}"
			done
	fi

	disable_multilib_libjava || die "failed to disable multilib java"
}

gcc-multilib-configure() {
	# if multilib is disabled, get out quick!
	if ! is_multilib ; then
		confgcc+=" --disable-multilib"
		return
	else
		confgcc+=" --enable-multilib"
	fi

	# translate our notion of multilibs into gcc's
	local abi map=() list
	case ${CTARGET} in
	x86_64*) tc_version_is_at_least 4.7 && map=(amd64:m64 x86:m32 x32:mx32) ;;
	esac
	for abi in $(get_all_abis) ; do
		local m a l
		for m in "${map[@]}" ; do
			a=${m%:*}
			l=${m#*:}
			[[ ${abi} == ${a} ]] && list=",${l}${list}"
		done
	done
	[[ -n ${list} ]] && confgcc+=" --with-multilib-list=${list:1}"
}

gcc-compiler-configure() {
	gcc-multilib-configure

	if tc_version_is_at_least "4.0" ; then
		if in_iuse mudflap ; then
			confgcc+=" $(use_enable mudflap libmudflap)"
		else
			confgcc+=" --disable-libmudflap"
		fi

		if want_libssp ; then
			confgcc+=" --enable-libssp"
		else
			export gcc_cv_libc_provides_ssp=yes
			confgcc+=" --disable-libssp"
		fi

		# If we want hardened support with the newer piepatchset for >=gcc 4.4
		if tc_version_is_at_least 4.4 && want_minispecs ; then
			confgcc+=" $(use_enable hardened esp)"
		fi

		if tc_version_is_at_least "4.2" ; then
			if in_iuse openmp ; then
				# Make sure target has pthreads support. #326757 #335883
				# There shouldn't be a chicken&egg problem here as openmp won't
				# build without a C library, and you can't build that w/out
				# already having a compiler ...
				if ! is_crosscompile || \
				   $(tc-getCPP ${CTARGET}) -E - <<<"#include <pthread.h>" >& /dev/null
				then
					confgcc+=" $(use_enable openmp libgomp)"
				else
					# Force disable as the configure script can be dumb #359855
					confgcc+=" --disable-libgomp"
				fi
			else
				# For gcc variants where we don't want openmp (e.g. kgcc)
				confgcc+=" --disable-libgomp"
			fi
		fi

		# Stick the python scripts in their own slotted directory
		# bug #279252
		#
		#  --with-python-dir=DIR
		#    Specifies where to install the Python modules used for aot-compile. DIR
		#  should not include the prefix used in installation. For example, if the
		#  Python modules are to be installed in /usr/lib/python2.5/site-packages,
		#  then –with-python-dir=/lib/python2.5/site-packages should be passed.
		#
		# This should translate into "/share/gcc-data/${CTARGET}/${GCC_CONFIG_VER}/python"
		if tc_version_is_at_least "4.4" ; then
			confgcc+=" --with-python-dir=${DATAPATH/$PREFIX/}/python"
		fi
	fi

	# For newer versions of gcc, use the default ("release"), because no
	# one (even upstream apparently) tests with it disabled. #317217
	if tc_version_is_at_least 4 || [[ -n ${GCC_CHECKS_LIST} ]] ; then
		confgcc+=" --enable-checking=${GCC_CHECKS_LIST:-release}"
	else
		confgcc+=" --disable-checking"
	fi

	# GTK+ is preferred over xlib in 3.4.x (xlib is unmaintained
	# right now). Much thanks to <csm@gnu.org> for the heads up.
	# Travis Tilley <lv@gentoo.org>	 (11 Jul 2004)
	if ! is_gcj ; then
		confgcc+=" --disable-libgcj"
	elif use gtk ; then
		confgcc+=" --enable-java-awt=gtk"
	fi

	# newer gcc versions like to bootstrap themselves with C++,
	# so we need to manually disable it ourselves
	if tc_version_is_at_least 4.7 && ! is_cxx ; then
		confgcc+=" --disable-build-with-cxx --disable-build-poststage1-with-cxx"
	fi

	# newer gcc's come with libquadmath, but only fortran uses
	# it, so auto punt it when we don't care
	if tc_version_is_at_least 4.6 && ! is_fortran ; then
		confgcc+=" --disable-libquadmath"
	fi

	case $(tc-arch) in
		arm)	#264534
			local arm_arch="${CTARGET%%-*}"
			# Only do this if arm_arch is armv*
			if [[ ${arm_arch} == armv* ]] ; then
				# Convert armv7{a,r,m} to armv7-{a,r,m}
				[[ ${arm_arch} == armv7? ]] && arm_arch=${arm_arch/7/7-}
				# Remove endian ('l' / 'eb')
				[[ ${arm_arch} == *l  ]] && arm_arch=${arm_arch%l}
				[[ ${arm_arch} == *eb ]] && arm_arch=${arm_arch%eb}
				confgcc+=" --with-arch=${arm_arch}"
			fi

			# Enable hardvfp
			if [[ ${CTARGET##*-} == *eabi ]] && [[ $(tc-is-hardfloat) == yes ]] && \
			    tc_version_is_at_least "4.5" ; then
			        confgcc+=" --with-float=hard"
			fi
			;;
		# Add --with-abi flags to set default MIPS ABI
		mips)
			local mips_abi=""
			[[ ${DEFAULT_ABI} == n64 ]] && mips_abi="--with-abi=64"
			[[ ${DEFAULT_ABI} == n32 ]] && mips_abi="--with-abi=n32"
			[[ -n ${mips_abi} ]] && confgcc+=" ${mips_abi}"
			;;
		# Default arch for x86 is normally i386, lets give it a bump
		# since glibc will do so based on CTARGET anyways
		x86)
			confgcc+=" --with-arch=${CTARGET%%-*}"
			;;
		# Enable sjlj exceptions for backward compatibility on hppa
		hppa)
			[[ ${GCCMAJOR} == "3" ]] && confgcc+=" --enable-sjlj-exceptions"
			;;
		# Set up defaults based on current CFLAGS
		ppc)
			is-flagq -mfloat-gprs=double && confgcc+=" --enable-e500-double"
			[[ ${CTARGET//_/-} == *-e500v2-* ]] && confgcc+=" --enable-e500-double"
			;;
	esac

	GCC_LANG="c"
	is_cxx && GCC_LANG="${GCC_LANG},c++"
	is_d   && GCC_LANG="${GCC_LANG},d"
	is_gcj && GCC_LANG="${GCC_LANG},java"
	is_go  && GCC_LANG="${GCC_LANG},go"
	if is_objc || is_objcxx ; then
		GCC_LANG="${GCC_LANG},objc"
		if tc_version_is_at_least "4.0" ; then
			use objc-gc && confgcc+=" --enable-objc-gc"
		fi
		is_objcxx && GCC_LANG="${GCC_LANG},obj-c++"
	fi
	is_treelang && GCC_LANG="${GCC_LANG},treelang"

	# fortran support just got sillier! the lang value can be f77 for
	# fortran77, f95 for fortran95, or just plain old fortran for the
	# currently supported standard depending on gcc version.
	is_fortran && GCC_LANG="${GCC_LANG},fortran"
	is_f77 && GCC_LANG="${GCC_LANG},f77"
	is_f95 && GCC_LANG="${GCC_LANG},f95"

	# We do NOT want 'ADA support' in here!
	# is_ada && GCC_LANG="${GCC_LANG},ada"

	einfo "configuring for GCC_LANG: ${GCC_LANG}"
}

# Other than the variables described for gcc_setup_variables, the following
# will alter tha behavior of gcc_do_configure:
#
#	CTARGET
#	CBUILD
#			Enable building for a target that differs from CHOST
#
#	GCC_LANG
#			Enable support for ${GCC_LANG} languages. defaults to just "c"
#
# Travis Tilley <lv@gentoo.org> (04 Sep 2004)
#
gcc_do_configure() {
	local confgcc

	# Sanity check for USE=nocxx -> USE=cxx migration
	if in_iuse cxx && in_iuse nocxx ; then
		if (use cxx && use nocxx) || (use !cxx && use !nocxx) ; then
			eerror "We are migrating USE=nocxx to USE=cxx, but your USE settings do not make"
			eerror "sense.  Please make sure these two flags line up logically in your setup."
			die "USE='cxx nocxx' and USE='-cxx -nocxx' make no sense"
		fi
	fi

	# Set configuration based on path variables
	confgcc+=" \
		--prefix=${PREFIX} \
		--bindir=${BINPATH} \
		--includedir=${INCLUDEPATH} \
		--datadir=${DATAPATH} \
		--mandir=${DATAPATH}/man \
		--infodir=${DATAPATH}/info \
		--with-gxx-include-dir=${STDCXX_INCDIR}"
	# On Darwin we need libdir to be set in order to get correct install names
	# for things like libobjc-gnu, libgcj and libfortran.  If we enable it on
	# non-Darwin we screw up the behaviour this eclass relies on.  We in
	# particular need this over --libdir for bug #255315.
	[[ ${CTARGET} == *-darwin* ]] && \
		confgcc+=" --enable-version-specific-runtime-libs"

	# All our cross-compile logic goes here !  woo !
	confgcc+=" --host=${CHOST}"
	if is_crosscompile || tc-is-cross-compiler ; then
		# Straight from the GCC install doc:
		# "GCC has code to correctly determine the correct value for target
		# for nearly all native systems. Therefore, we highly recommend you
		# not provide a configure target when configuring a native compiler."
		confgcc+=" --target=${CTARGET}"
	fi
	[[ -n ${CBUILD} ]] && confgcc+=" --build=${CBUILD}"

	# ppc altivec support
	confgcc+=" $(use_enable altivec)"

	# gcc has fixed-point arithmetic support in 4.3 for mips targets that can
	# significantly increase compile time by several hours.  This will allow
	# users to control this feature in the event they need the support.
	tc_version_is_at_least "4.3" && confgcc+=" $(use_enable fixed-point)"

	# Graphite support was added in 4.4, which depends on external libraries
	# for optimizations.  Up to 4.6 we use cloog-ppl (cloog fork with Parma PPL
	# backend).  Later versions will use upstream cloog with the ISL backend.  We
	# disable the PPL version check so we can use >=ppl-0.11.
	if tc_version_is_at_least "4.4"; then
		confgcc+=" $(use_with graphite ppl)"
		confgcc+=" $(use_with graphite cloog)"
		if use graphite; then
			confgcc+=" --disable-ppl-version-check"
			# this will be removed when cloog-ppl-0.15.10 goes stable
			if has_version '>=dev-libs/cloog-ppl-0.15.10'; then
				confgcc+=" --with-cloog-include=/usr/include/cloog-ppl"
			else
				confgcc+=" --with-cloog-include=/usr/include/cloog"
			fi
		fi
	fi

	# LTO support was added in 4.5, which depends upon elfutils.  This allows
	# users to enable that option, and pull in the additional library.  In 4.6,
	# the dependency is no longer required.
	if tc_version_is_at_least "4.6" ; then
		confgcc+=" --enable-lto"
	elif tc_version_is_at_least "4.5" ; then
		confgcc+=" $(use_enable lto)"
	fi

	[[ $(tc-is-softfloat) == "yes" ]] && confgcc+=" --with-float=soft"
	[[ $(tc-is-hardfloat) == "yes" ]] && confgcc+=" --with-float=hard"

	# Native Language Support
	if use nls ; then
		confgcc+=" --enable-nls --without-included-gettext"
	else
		confgcc+=" --disable-nls"
	fi

	# reasonably sane globals (hopefully)
	confgcc+=" \
		--with-system-zlib \
		--disable-werror \
		--enable-secureplt"

	gcc-compiler-configure || die

	# if not specified, assume we are building for a target that only
	# requires C support
	GCC_LANG=${GCC_LANG:-c}
	confgcc+=" --enable-languages=${GCC_LANG}"

	if is_crosscompile ; then
		# When building a stage1 cross-compiler (just C compiler), we have to
		# disable a bunch of features or gcc goes boom
		local needed_libc=""
		case ${CTARGET} in
			*-linux)		 needed_libc=no-fucking-clue;;
			*-dietlibc)		 needed_libc=dietlibc;;
			*-elf|*-eabi)	 needed_libc=newlib;;
			*-freebsd*)		 needed_libc=freebsd-lib;;
			*-gnu*)			 needed_libc=glibc;;
			*-klibc)		 needed_libc=klibc;;
			*-uclibc*)		 needed_libc=uclibc;;
			*-cygwin)        needed_libc=cygwin;;
			mingw*|*-mingw*) needed_libc=mingw-runtime;;
			avr)			 confgcc+=" --enable-shared --disable-threads";;
		esac
		if [[ -n ${needed_libc} ]] ; then
			if ! has_version ${CATEGORY}/${needed_libc} ; then
				confgcc+=" --disable-shared --disable-threads --without-headers"
			elif built_with_use --hidden --missing false ${CATEGORY}/${needed_libc} crosscompile_opts_headers-only ; then
				confgcc+=" --disable-shared --with-sysroot=${PREFIX}/${CTARGET}"
			else
				confgcc+=" --with-sysroot=${PREFIX}/${CTARGET}"
			fi
		fi

		if [[ ${GCCMAJOR}.${GCCMINOR} > 4.1 ]] ; then
			confgcc+=" --disable-bootstrap"
		fi
	else
		if tc-is-static-only ; then
			confgcc+=" --disable-shared"
		else
			confgcc+=" --enable-shared"
		fi
		case ${CHOST} in
			mingw*|*-mingw*|*-cygwin)
				confgcc+=" --enable-threads=win32" ;;
			*)
				confgcc+=" --enable-threads=posix" ;;
		esac
	fi
	# __cxa_atexit is "essential for fully standards-compliant handling of
	# destructors", but apparently requires glibc.
	case ${CTARGET} in
	*-uclibc*)
		confgcc+=" --disable-__cxa_atexit --enable-target-optspace $(use_enable nptl tls)"
		[[ ${GCCMAJOR}.${GCCMINOR} == 3.3 ]] && confgcc+=" --enable-sjlj-exceptions"
		if tc_version_is_at_least 3.4 && [[ ${GCCMAJOR}.${GCCMINOR} < 4.3 ]] ; then
			confgcc+=" --enable-clocale=uclibc"
		fi
		;;
	*-elf|*-eabi)
		confgcc+=" --with-newlib"
		;;
	*-gnu*)
		confgcc+=" --enable-__cxa_atexit"
		confgcc+=" --enable-clocale=gnu"
		;;
	*-freebsd*)
		confgcc+=" --enable-__cxa_atexit"
		;;
	*-solaris*)
		confgcc+=" --enable-__cxa_atexit"
		;;
	esac
	[[ ${GCCMAJOR}.${GCCMINOR} < 3.4 ]] && confgcc+=" --disable-libunwind-exceptions"

	# create a sparc*linux*-{gcc,g++} that can handle -m32 and -m64 (biarch)
	if [[ ${CTARGET} == sparc*linux* ]] \
		&& is_multilib \
		&& ! is_crosscompile \
		&& [[ ${GCCMAJOR}.${GCCMINOR} > 4.2 ]]
	then
		confgcc+=" --enable-targets=all"
	fi

	tc_version_is_at_least 4.3 && set -- "$@" \
		--with-bugurl=http://bugs.gentoo.org/ \
		--with-pkgversion="${BRANDING_GCC_PKGVERSION}"
	set -- ${confgcc} "$@" ${EXTRA_ECONF}

	# Nothing wrong with a good dose of verbosity
	echo
	einfo "PREFIX:			${PREFIX}"
	einfo "BINPATH:			${BINPATH}"
	einfo "LIBPATH:			${LIBPATH}"
	einfo "DATAPATH:		${DATAPATH}"
	einfo "STDCXX_INCDIR:	${STDCXX_INCDIR}"
	echo
	einfo "Configuring GCC with: ${@//--/\n\t--}"
	echo

	# Build in a separate build tree
	mkdir -p "${WORKDIR}"/build
	pushd "${WORKDIR}"/build > /dev/null

	# and now to do the actual configuration
	addwrite /dev/zero
	echo "${S}"/configure "$@"
	"${S}"/configure "$@" || die "failed to run configure"

	# return to whatever directory we were in before
	popd > /dev/null
}

# This function accepts one optional argument, the make target to be used.
# If ommitted, gcc_do_make will try to guess whether it should use all,
# profiledbootstrap, or bootstrap-lean depending on CTARGET and arch. An
# example of how to use this function:
#
#	gcc_do_make all-target-libstdc++-v3
#
# In addition to the target to be used, the following variables alter the
# behavior of this function:
#
#	LDFLAGS
#			Flags to pass to ld
#
#	STAGE1_CFLAGS
#			CFLAGS to use during stage1 of a gcc bootstrap
#
#	BOOT_CFLAGS
#			CFLAGS to use during stages 2+3 of a gcc bootstrap.
#
# Travis Tilley <lv@gentoo.org> (04 Sep 2004)
#
gcc_do_make() {
	# Fix for libtool-portage.patch
	local OLDS=${S}
	S=${WORKDIR}/build

	# Set make target to $1 if passed
	[[ -n $1 ]] && GCC_MAKE_TARGET=$1
	# default target
	if is_crosscompile || tc-is-cross-compiler ; then
		# 3 stage bootstrapping doesnt quite work when you cant run the
		# resulting binaries natively ^^;
		GCC_MAKE_TARGET=${GCC_MAKE_TARGET-all}
	else
		GCC_MAKE_TARGET=${GCC_MAKE_TARGET-bootstrap-lean}
	fi

	# the gcc docs state that parallel make isnt supported for the
	# profiledbootstrap target, as collisions in profile collecting may occur.
	[[ ${GCC_MAKE_TARGET} == "profiledbootstrap" ]] && export MAKEOPTS="${MAKEOPTS} -j1"

	# boundschecking seems to introduce parallel build issues
	want_boundschecking && export MAKEOPTS="${MAKEOPTS} -j1"

	if [[ ${GCC_MAKE_TARGET} == "all" ]] ; then
		STAGE1_CFLAGS=${STAGE1_CFLAGS-"${CFLAGS}"}
	elif [[ $(gcc-version) == "3.4" && ${GCC_BRANCH_VER} == "3.4" ]] && gcc-specs-ssp ; then
		# See bug #79852
		STAGE1_CFLAGS=${STAGE1_CFLAGS-"-O2"}
	fi

	if is_crosscompile; then
		# In 3.4, BOOT_CFLAGS is never used on a crosscompile...
		# but I'll leave this in anyways as someone might have had
		# some reason for putting it in here... --eradicator
		BOOT_CFLAGS=${BOOT_CFLAGS-"-O2"}
	else
		# we only want to use the system's CFLAGS if not building a
		# cross-compiler.
		BOOT_CFLAGS=${BOOT_CFLAGS-"$(get_abi_CFLAGS) ${CFLAGS}"}
	fi

	pushd "${WORKDIR}"/build

	emake \
		LDFLAGS="${LDFLAGS}" \
		STAGE1_CFLAGS="${STAGE1_CFLAGS}" \
		LIBPATH="${LIBPATH}" \
		BOOT_CFLAGS="${BOOT_CFLAGS}" \
		${GCC_MAKE_TARGET} \
		|| die "emake failed with ${GCC_MAKE_TARGET}"

	if ! is_crosscompile && use cxx && use doc ; then
		if type -p doxygen > /dev/null ; then
			if tc_version_is_at_least 4.3 ; then
				cd "${CTARGET}"/libstdc++-v3/doc
				emake doc-man-doxygen || ewarn "failed to make docs"
			elif tc_version_is_at_least 3.0 ; then
				cd "${CTARGET}"/libstdc++-v3
				emake doxygen-man || ewarn "failed to make docs"
			fi
		else
			ewarn "Skipping libstdc++ manpage generation since you don't have doxygen installed"
		fi
	fi

	popd
}

# This is mostly a stub function to be overwritten in an ebuild
gcc_do_filter_flags() {
	strip-flags

	# In general gcc does not like optimization, and add -O2 where
	# it is safe.  This is especially true for gcc 3.3 + 3.4
	replace-flags -O? -O2

	# ... sure, why not?
	strip-unsupported-flags

	# dont want to funk ourselves
	filter-flags '-mabi*' -m31 -m32 -m64

	case ${GCC_BRANCH_VER} in
	3.2|3.3)
		replace-cpu-flags k8 athlon64 opteron i686 x86-64
		replace-cpu-flags pentium-m pentium3m pentium3
		case $(tc-arch) in
			amd64|x86) filter-flags '-mtune=*' ;;
			# in gcc 3.3 there is a bug on ppc64 where if -mcpu is used,
			# the compiler wrongly assumes a 32bit target
			ppc64) filter-flags "-mcpu=*";;
		esac
		case $(tc-arch) in
			amd64) replace-cpu-flags core2 nocona;;
			x86)   replace-cpu-flags core2 prescott;;
		esac

		replace-cpu-flags G3 750
		replace-cpu-flags G4 7400
		replace-cpu-flags G5 7400

		# XXX: should add a sed or something to query all supported flags
		#      from the gcc source and trim everything else ...
		filter-flags -f{no-,}unit-at-a-time -f{no-,}web -mno-tls-direct-seg-refs
		filter-flags -f{no-,}stack-protector{,-all}
		filter-flags -fvisibility-inlines-hidden -fvisibility=hidden
		;;
	3.4|4.*)
		case $(tc-arch) in
			x86|amd64) filter-flags '-mcpu=*';;
			*-macos)
				# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25127
				[[ ${GCC_BRANCH_VER} == 4.0 || ${GCC_BRANCH_VER}  == 4.1 ]] && \
					filter-flags '-mcpu=*' '-march=*' '-mtune=*'
			;;
		esac
		;;
	esac

	# Compile problems with these (bug #6641 among others)...
	#filter-flags "-fno-exceptions -fomit-frame-pointer -fforce-addr"

	# CFLAGS logic (verified with 3.4.3):
	# CFLAGS:
	#	This conflicts when creating a crosscompiler, so set to a sane
	#	  default in this case:
	#	used in ./configure and elsewhere for the native compiler
	#	used by gcc when creating libiberty.a
	#	used by xgcc when creating libstdc++ (and probably others)!
	#	  this behavior should be removed...
	#
	# CXXFLAGS:
	#	used by xgcc when creating libstdc++
	#
	# STAGE1_CFLAGS (not used in creating a crosscompile gcc):
	#	used by ${CHOST}-gcc for building stage1 compiler
	#
	# BOOT_CFLAGS (not used in creating a crosscompile gcc):
	#	used by xgcc for building stage2/3 compiler

	if is_crosscompile ; then
		# Set this to something sane for both native and target
		CFLAGS="-O2 -pipe"

		local VAR="CFLAGS_"${CTARGET//-/_}
		CXXFLAGS=${!VAR}
	fi

	export GCJFLAGS=${GCJFLAGS:-${CFLAGS}}
}

toolchain_src_compile() {
	gcc_do_filter_flags
	einfo "CFLAGS=\"${CFLAGS}\""
	einfo "CXXFLAGS=\"${CXXFLAGS}\""

	# Force internal zip based jar script to avoid random
	# issues with 3rd party jar implementations.  #384291
	export JAR=no

	# For hardened gcc 4.3 piepatchset to build the hardened specs
	# file (build.specs) to use when building gcc.
	if ! tc_version_is_at_least 4.4 && want_minispecs ; then
		setup_minispecs_gcc_build_specs
	fi
	# Build in a separate build tree
	mkdir -p "${WORKDIR}"/build
	pushd "${WORKDIR}"/build > /dev/null

	# Install our pre generated manpages if we do not have perl ...
	[[ ! -x /usr/bin/perl ]] && [[ -n ${MAN_VER} ]] && \
		unpack gcc-${MAN_VER}-manpages.tar.bz2

	einfo "Configuring ${PN} ..."
	gcc_do_configure

	touch "${S}"/gcc/c-gperf.h

	# Do not make manpages if we do not have perl ...
	[[ ! -x /usr/bin/perl ]] \
		&& find "${WORKDIR}"/build -name '*.[17]' | xargs touch

	einfo "Compiling ${PN} ..."
	gcc_do_make ${GCC_MAKE_TARGET}

	# Do not create multiple specs files for PIE+SSP if boundschecking is in
	# USE, as we disable PIE+SSP when it is.
	if want_split_specs && ! want_minispecs; then
		split_out_specs_files || die "failed to split out specs"
	fi

	popd > /dev/null
}

toolchain_src_test() {
	cd "${WORKDIR}"/build
	emake -k check || ewarn "check failed and that sucks :("
}

toolchain_src_install() {
	local x=

	cd "${WORKDIR}"/build
	# Do allow symlinks in private gcc include dir as this can break the build
	find gcc/include*/ -type l -print0 | xargs -0 rm -f
	# Remove generated headers, as they can cause things to break
	# (ncurses, openssl, etc).
	for x in $(find gcc/include*/ -name '*.h') ; do
		grep -q 'It has been auto-edited by fixincludes from' "${x}" \
			&& rm -f "${x}"
	done
	# Do the 'make install' from the build directory
	S=${WORKDIR}/build \
	emake -j1 DESTDIR="${D}" install || die
	# Punt some tools which are really only useful while building gcc
	find "${D}" -name install-tools -prune -type d -exec rm -rf "{}" \;
	# This one comes with binutils
	find "${D}" -name libiberty.a -exec rm -f "{}" \;

	# Move the libraries to the proper location
	gcc_movelibs

	# Basic sanity check
	if ! is_crosscompile ; then
		local EXEEXT
		eval $(grep ^EXEEXT= "${WORKDIR}"/build/gcc/config.log)
		[[ -r ${D}${BINPATH}/gcc${EXEEXT} ]] || die "gcc not found in ${D}"
	fi

	dodir /etc/env.d/gcc
	create_gcc_env_entry

	if want_split_specs ; then
		if use hardened ; then
			create_gcc_env_entry vanilla
		fi
		! use hardened && hardened_gcc_works && create_gcc_env_entry hardened
		if hardened_gcc_works || hardened_gcc_works pie ; then
			create_gcc_env_entry hardenednossp
		fi
		if hardened_gcc_works || hardened_gcc_works ssp ; then
			create_gcc_env_entry hardenednopie
		fi
		create_gcc_env_entry hardenednopiessp

		insinto ${LIBPATH}
		doins "${WORKDIR}"/build/*.specs || die "failed to install specs"
	fi
	# Setup the gcc_env_entry for hardened gcc 4 with minispecs
	if want_minispecs ; then
		copy_minispecs_gcc_specs
	fi
	# Make sure we dont have stuff lying around that
	# can nuke multiple versions of gcc

	gcc_slot_java

	# Move <cxxabi.h> to compiler-specific directories
	[[ -f ${D}${STDCXX_INCDIR}/cxxabi.h ]] && \
		mv -f "${D}"${STDCXX_INCDIR}/cxxabi.h "${D}"${LIBPATH}/include/

	# These should be symlinks
	dodir /usr/bin
	cd "${D}"${BINPATH}
	for x in cpp gcc g++ c++ g77 gcj gcjh gfortran gccgo ; do
		# For some reason, g77 gets made instead of ${CTARGET}-g77...
		# this should take care of that
		[[ -f ${x} ]] && mv ${x} ${CTARGET}-${x}

		if [[ -f ${CTARGET}-${x} ]] && ! is_crosscompile ; then
			ln -sf ${CTARGET}-${x} ${x}

			# Create version-ed symlinks
			dosym ${BINPATH}/${CTARGET}-${x} \
				/usr/bin/${CTARGET}-${x}-${GCC_CONFIG_VER}
			dosym ${BINPATH}/${CTARGET}-${x} \
				/usr/bin/${x}-${GCC_CONFIG_VER}
		fi

		if [[ -f ${CTARGET}-${x}-${GCC_CONFIG_VER} ]] ; then
			rm -f ${CTARGET}-${x}-${GCC_CONFIG_VER}
			ln -sf ${CTARGET}-${x} ${CTARGET}-${x}-${GCC_CONFIG_VER}
		fi
	done

	# I do not know if this will break gcj stuff, so I'll only do it for
	#	objc for now; basically "ffi.h" is the correct file to include,
	#	but it gets installed in .../GCCVER/include and yet it does
	#	"#include <ffitarget.h>" which (correctly, as it's an "extra" file)
	#	is installed in .../GCCVER/include/libffi; the following fixes
	#	ffi.'s include of ffitarget.h - Armando Di Cianno <fafhrd@gentoo.org>
	if [[ -d ${D}${LIBPATH}/include/libffi ]] ; then
		mv -i "${D}"${LIBPATH}/include/libffi/* "${D}"${LIBPATH}/include || die
		rm -r "${D}"${LIBPATH}/include/libffi || die
	fi

	# Now do the fun stripping stuff
	env RESTRICT="" CHOST=${CHOST} prepstrip "${D}${BINPATH}"
	env RESTRICT="" CHOST=${CTARGET} prepstrip "${D}${LIBPATH}"
	# gcc used to install helper binaries in lib/ but then moved to libexec/
	[[ -d ${D}${PREFIX}/libexec/gcc ]] && \
		env RESTRICT="" CHOST=${CHOST} prepstrip "${D}${PREFIX}/libexec/gcc/${CTARGET}/${GCC_CONFIG_VER}"

	cd "${S}"
	if is_crosscompile; then
		rm -rf "${D}"/usr/share/{man,info}
		rm -rf "${D}"${DATAPATH}/{man,info}
	else
		local cxx_mandir=${WORKDIR}/build/${CTARGET}/libstdc++-v3/docs/doxygen/man
		if [[ -d ${cxx_mandir} ]] ; then
			# clean bogus manpages #113902
			find "${cxx_mandir}" -name '*_build_*' -exec rm {} \;
			cp -r "${cxx_mandir}"/man? "${D}/${DATAPATH}"/man/
		fi
		has noinfo ${FEATURES} \
			&& rm -r "${D}/${DATAPATH}"/info \
			|| prepinfo "${DATAPATH}"
		has noman ${FEATURES} \
			&& rm -r "${D}/${DATAPATH}"/man \
			|| prepman "${DATAPATH}"
	fi
	# prune empty dirs left behind
	for x in 1 2 3 4 ; do
		find "${D}" -type d -exec rmdir "{}" \; >& /dev/null
	done

	# install testsuite results
	if use test; then
		docinto testsuite
		find "${WORKDIR}"/build -type f -name "*.sum" -print0 | xargs -0 dodoc
		find "${WORKDIR}"/build -type f -path "*/testsuite/*.log" -print0 \
			| xargs -0 dodoc
	fi

	# Rather install the script, else portage with changing $FILESDIR
	# between binary and source package borks things ....
	if ! is_crosscompile ; then
		insinto "${DATAPATH}"
		if tc_version_is_at_least 4.0 ; then
			newins "${GCC_FILESDIR}"/awk/fixlafiles.awk-no_gcc_la fixlafiles.awk || die
			find "${D}/${LIBPATH}" -name libstdc++.la -type f -exec rm "{}" \;
		else
			doins "${GCC_FILESDIR}"/awk/fixlafiles.awk || die
		fi
		exeinto "${DATAPATH}"
		doexe "${GCC_FILESDIR}"/fix_libtool_files.sh || die
		doexe "${GCC_FILESDIR}"/c{89,99} || die
	fi

	# use gid of 0 because some stupid ports don't have
	# the group 'root' set to gid 0
	chown -R root:0 "${D}"${LIBPATH}

	# Move pretty-printers to gdb datadir to shut ldconfig up
	gdbdir=/usr/share/gdb/auto-load${LIBPATH/\/lib\//\/$(get_libdir)\/}
	for i in "${D}"${LIBPATH}{,/32}/*-gdb.py; do
		if [[ -e ${i} ]]; then
			basedir="$(dirname ${i/${D}${LIBPATH}/})"
			sed -i -e "s:^\(libdir = \).*:\1'${LIBPATH}${basedir}':" "${i}" #348128
			insinto "${gdbdir}${basedir}"
			doins "${i}"
			rm "${i}"
		fi
	done

	# Don't scan .gox files for executable stacks - false positives
	export QA_EXECSTACK="usr/lib*/go/*/*.gox"
	export QA_WX_LOAD="usr/lib*/go/*/*.gox"
}

gcc_slot_java() {
	local x

	# Move Java headers to compiler-specific dir
	for x in "${D}"${PREFIX}/include/gc*.h "${D}"${PREFIX}/include/j*.h ; do
		[[ -f ${x} ]] && mv -f "${x}" "${D}"${LIBPATH}/include/
	done
	for x in gcj gnu java javax org ; do
		if [[ -d ${D}${PREFIX}/include/${x} ]] ; then
			dodir /${LIBPATH}/include/${x}
			mv -f "${D}"${PREFIX}/include/${x}/* "${D}"${LIBPATH}/include/${x}/
			rm -rf "${D}"${PREFIX}/include/${x}
		fi
	done

	if [[ -d ${D}${PREFIX}/lib/security ]] || [[ -d ${D}${PREFIX}/$(get_libdir)/security ]] ; then
		dodir /${LIBPATH}/security
		mv -f "${D}"${PREFIX}/lib*/security/* "${D}"${LIBPATH}/security
		rm -rf "${D}"${PREFIX}/lib*/security
	fi

	# Move libgcj.spec to compiler-specific directories
	[[ -f ${D}${PREFIX}/lib/libgcj.spec ]] && \
		mv -f "${D}"${PREFIX}/lib/libgcj.spec "${D}"${LIBPATH}/libgcj.spec

	# SLOT up libgcj.pc (and let gcc-config worry about links)
	local libgcj=$(find "${D}"${PREFIX}/lib/pkgconfig/ -name 'libgcj*.pc')
	if [[ -n ${libgcj} ]] ; then
		sed -i "/^libdir=/s:=.*:=${LIBPATH}:" "${libgcj}"
		mv "${libgcj}" "${D}"/usr/lib/pkgconfig/libgcj-${GCC_PV}.pc || die
	fi

	# Rename jar because it could clash with Kaffe's jar if this gcc is
	# primary compiler (aka don't have the -<version> extension)
	cd "${D}"${BINPATH}
	[[ -f jar ]] && mv -f jar gcj-jar
}

# Move around the libs to the right location.  For some reason,
# when installing gcc, it dumps internal libraries into /usr/lib
# instead of the private gcc lib path
gcc_movelibs() {
	# older versions of gcc did not support --print-multi-os-directory
	tc_version_is_at_least 3.0 || return 0

	local multiarg removedirs=""
	for multiarg in $($(XGCC) -print-multi-lib) ; do
		multiarg=${multiarg#*;}
		multiarg=${multiarg//@/ -}

		local OS_MULTIDIR=$($(XGCC) ${multiarg} --print-multi-os-directory)
		local MULTIDIR=$($(XGCC) ${multiarg} --print-multi-directory)
		local TODIR=${D}${LIBPATH}/${MULTIDIR}
		local FROMDIR=

		[[ -d ${TODIR} ]] || mkdir -p ${TODIR}

		for FROMDIR in \
			${LIBPATH}/${OS_MULTIDIR} \
			${LIBPATH}/../${MULTIDIR} \
			${PREFIX}/lib/${OS_MULTIDIR} \
			${PREFIX}/${CTARGET}/lib/${OS_MULTIDIR}
		do
			removedirs="${removedirs} ${FROMDIR}"
			FROMDIR=${D}${FROMDIR}
			if [[ ${FROMDIR} != "${TODIR}" && -d ${FROMDIR} ]] ; then
				local files=$(find "${FROMDIR}" -maxdepth 1 ! -type d 2>/dev/null)
				if [[ -n ${files} ]] ; then
					mv ${files} "${TODIR}"
				fi
			fi
		done
		fix_libtool_libdir_paths "${LIBPATH}/${MULTIDIR}"
	done

	# We remove directories separately to avoid this case:
	#	mv SRC/lib/../lib/*.o DEST
	#	rmdir SRC/lib/../lib/
	#	mv SRC/lib/../lib32/*.o DEST  # Bork
	for FROMDIR in ${removedirs} ; do
		rmdir "${D}"${FROMDIR} >& /dev/null
	done
	find "${D}" -type d | xargs rmdir >& /dev/null
}

#----<< src_* >>----

#---->> unorganized crap in need of refactoring follows

# gcc_quick_unpack will unpack the gcc tarball and patches in a way that is
# consistant with the behavior of get_gcc_src_uri. The only patch it applies
# itself is the branch update if present.
#
# Travis Tilley <lv@gentoo.org> (03 Sep 2004)
#
gcc_quick_unpack() {
	pushd "${WORKDIR}" > /dev/null
	export PATCH_GCC_VER=${PATCH_GCC_VER:-${GCC_RELEASE_VER}}
	export UCLIBC_GCC_VER=${UCLIBC_GCC_VER:-${PATCH_GCC_VER}}
	export PIE_GCC_VER=${PIE_GCC_VER:-${GCC_RELEASE_VER}}
	export PP_GCC_VER=${PP_GCC_VER:-${GCC_RELEASE_VER}}
	export HTB_GCC_VER=${HTB_GCC_VER:-${GCC_RELEASE_VER}}
	export SPECS_GCC_VER=${SPECS_GCC_VER:-${GCC_RELEASE_VER}}

	if [[ -n ${GCC_A_FAKEIT} ]] ; then
		unpack ${GCC_A_FAKEIT}
	elif [[ -n ${PRERELEASE} ]] ; then
		unpack gcc-${PRERELEASE}.tar.bz2
	elif [[ -n ${SNAPSHOT} ]] ; then
		unpack gcc-${SNAPSHOT}.tar.bz2
	else
		unpack gcc-${GCC_RELEASE_VER}.tar.bz2
		# We want branch updates to be against a release tarball
		if [[ -n ${BRANCH_UPDATE} ]] ; then
			pushd "${S}" > /dev/null
			epatch "${DISTDIR}"/gcc-${GCC_RELEASE_VER}-branch-update-${BRANCH_UPDATE}.patch.bz2
			popd > /dev/null
		fi
	fi

	if [[ -n ${D_VER} ]] && use d ; then
		pushd "${S}"/gcc > /dev/null
		unpack gdc-${D_VER}-src.tar.bz2
		cd ..
		ebegin "Adding support for the D language"
		./gcc/d/setup-gcc.sh >& "${T}"/dgcc.log
		if ! eend $? ; then
			eerror "The D gcc package failed to apply"
			eerror "Please include this log file when posting a bug report:"
			eerror "  ${T}/dgcc.log"
			die "failed to include the D language"
		fi
		popd > /dev/null
	fi

	[[ -n ${PATCH_VER} ]] && \
		unpack gcc-${PATCH_GCC_VER}-patches-${PATCH_VER}.tar.bz2

	[[ -n ${UCLIBC_VER} ]] && \
		unpack gcc-${UCLIBC_GCC_VER}-uclibc-patches-${UCLIBC_VER}.tar.bz2

	if want_ssp ; then
		if [[ -n ${PP_FVER} ]] ; then
			# The gcc 3.4 propolice versions are meant to be unpacked to ${S}
			pushd "${S}" > /dev/null
			unpack protector-${PP_FVER}.tar.gz
			popd > /dev/null
		else
			unpack gcc-${PP_GCC_VER}-ssp-${PP_VER}.tar.bz2
		fi
	fi

	if want_pie ; then
		if [[ -n ${PIE_CORE} ]] ; then
			unpack ${PIE_CORE}
		else
			unpack gcc-${PIE_GCC_VER}-piepatches-v${PIE_VER}.tar.bz2
		fi
		[[ -n ${SPECS_VER} ]] && \
			unpack gcc-${SPECS_GCC_VER}-specs-${SPECS_VER}.tar.bz2
	fi

	want_boundschecking && \
		unpack "bounds-checking-gcc-${HTB_GCC_VER}-${HTB_VER}.patch.bz2"

	popd > /dev/null
}

# Exclude any unwanted patches, as specified by the following variables:
#
#	GENTOO_PATCH_EXCLUDE
#			List of filenames, relative to ${WORKDIR}/patch/
#
#	PIEPATCH_EXCLUDE
#			List of filenames, relative to ${WORKDIR}/piepatch/
#
# Travis Tilley <lv@gentoo.org> (03 Sep 2004)
#
exclude_gcc_patches() {
	local i
	for i in ${GENTOO_PATCH_EXCLUDE} ; do
		if [[ -f ${WORKDIR}/patch/${i} ]] ; then
			einfo "Excluding patch ${i}"
			rm -f "${WORKDIR}"/patch/${i} || die "failed to delete ${i}"
		fi
	done
	for i in ${PIEPATCH_EXCLUDE} ; do
		if [[ -f ${WORKDIR}/piepatch/${i} ]] ; then
			einfo "Excluding piepatch ${i}"
			rm -f "${WORKDIR}"/piepatch/${i} || die "failed to delete ${i}"
		fi
	done
}

# Try to apply some stub patches so that gcc won't error out when
# passed parameters like -fstack-protector but no ssp is found
do_gcc_stub() {
	local v stub_patch=""
	for v in ${GCC_RELEASE_VER} ${GCC_BRANCH_VER} ; do
		stub_patch=${GCC_FILESDIR}/stubs/gcc-${v}-$1-stub.patch
		if [[ -e ${stub_patch} ]] && ! use vanilla ; then
			EPATCH_SINGLE_MSG="Applying stub patch for $1 ..." \
			epatch "${stub_patch}"
			return 0
		fi
	done
}

do_gcc_HTB_patches() {
	if ! want_boundschecking || \
	   (want_ssp && [[ ${HTB_EXCLUSIVE} == "true" ]])
	then
		do_gcc_stub htb
		return 0
	fi

	# modify the bounds checking patch with a regression patch
	epatch "${WORKDIR}/bounds-checking-gcc-${HTB_GCC_VER}-${HTB_VER}.patch"
	BRANDING_GCC_PKGVERSION="${BRANDING_GCC_PKGVERSION}, HTB-${HTB_GCC_VER}-${HTB_VER}"
}

# patch in ProPolice Stack Smashing protection
do_gcc_SSP_patches() {
	# PARISC has no love ... it's our stack :(
	if [[ $(tc-arch) == "hppa" ]] || \
	   ! want_ssp || \
	   (want_boundschecking && [[ ${HTB_EXCLUSIVE} == "true" ]])
	then
		do_gcc_stub ssp
		return 0
	fi

	local ssppatch
	local sspdocs

	if [[ -n ${PP_FVER} ]] ; then
		# Etoh keeps changing where files are and what the patch is named
		if tc_version_is_at_least 3.4.1 ; then
			# >3.4.1 uses version in patch name, and also includes docs
			ssppatch="${S}/gcc_${PP_VER}.dif"
			sspdocs="yes"
		elif tc_version_is_at_least 3.4.0 ; then
			# >3.4 put files where they belong and 3_4 uses old patch name
			ssppatch="${S}/protector.dif"
			sspdocs="no"
		elif tc_version_is_at_least 3.2.3 ; then
			# earlier versions have no directory structure or docs
			mv "${S}"/protector.{c,h} "${S}"/gcc
			ssppatch="${S}/protector.dif"
			sspdocs="no"
		fi
	else
		# Just start packaging the damn thing ourselves
		mv "${WORKDIR}"/ssp/protector.{c,h} "${S}"/gcc/
		ssppatch=${WORKDIR}/ssp/gcc-${PP_GCC_VER}-ssp.patch
		# allow boundschecking and ssp to get along
		(want_boundschecking && [[ -e ${WORKDIR}/ssp/htb-ssp.patch ]]) \
			&& patch -s "${ssppatch}" "${WORKDIR}"/ssp/htb-ssp.patch
	fi

	[[ -z ${ssppatch} ]] && die "Sorry, SSP is not supported in this version"
	epatch ${ssppatch}

	if [[ ${PN} == "gcc" && ${sspdocs} == "no" ]] ; then
		epatch "${GCC_FILESDIR}"/pro-police-docs.patch
	fi

	# Don't build crtbegin/end with ssp
	sed -e 's|^CRTSTUFF_CFLAGS = |CRTSTUFF_CFLAGS = -fno-stack-protector |'\
		-i gcc/Makefile.in || die "Failed to update crtstuff!"

	# if gcc in a stage3 defaults to ssp, is version 3.4.0 and a stage1 is built
	# the build fails building timevar.o w/:
	# cc1: stack smashing attack in function ix86_split_to_parts()
	if use build && tc_version_is_at_least 3.4.0 ; then
		if gcc -dumpspecs | grep -q "fno-stack-protector:" ; then
			epatch "${GCC_FILESDIR}"/3.4.0/gcc-3.4.0-cc1-no-stack-protector.patch
		fi
	fi

	BRANDING_GCC_PKGVERSION="${BRANDING_GCC_PKGVERSION}, ssp-${PP_FVER:-${PP_GCC_VER}-${PP_VER}}"
	if want_libssp ; then
		update_gcc_for_libssp
	else
		update_gcc_for_libc_ssp
	fi

	# Don't build libgcc with ssp
	sed -e 's|^\(LIBGCC2_CFLAGS.*\)$|\1 -fno-stack-protector|' \
		-i gcc/Makefile.in || die "Failed to update gcc!"
}

# If glibc or uclibc has been patched to provide the necessary symbols itself,
# then lets use those for SSP instead of libgcc.
update_gcc_for_libc_ssp() {
	if libc_has_ssp ; then
		einfo "Updating gcc to use SSP from libc ..."
		sed -e 's|^\(LIBGCC2_CFLAGS.*\)$|\1 -D_LIBC_PROVIDES_SSP_|' \
			-i "${S}"/gcc/Makefile.in || die "Failed to update gcc!"
	fi
}

# a split out non-libc non-libgcc ssp requires additional spec logic changes
update_gcc_for_libssp() {
	einfo "Updating gcc to use SSP from libssp..."
	sed -e 's|^\(INTERNAL_CFLAGS.*\)$|\1 -D_LIBSSP_PROVIDES_SSP_|' \
		-i "${S}"/gcc/Makefile.in || die "Failed to update gcc!"
}

# do various updates to PIE logic
do_gcc_PIE_patches() {
	if ! want_pie || \
	   (want_boundschecking && [[ ${HTB_EXCLUSIVE} == "true" ]])
	then
		return 0
	fi

	want_boundschecking \
		&& rm -f "${WORKDIR}"/piepatch/*/*-boundschecking-no.patch* \
		|| rm -f "${WORKDIR}"/piepatch/*/*-boundschecking-yes.patch*

	use vanilla && return 0

	if tc_version_is_at_least 4.3.2; then
		guess_patch_type_in_dir "${WORKDIR}"/piepatch/
		EPATCH_MULTI_MSG="Applying pie patches ..." \
		epatch "${WORKDIR}"/piepatch/
	else
		guess_patch_type_in_dir "${WORKDIR}"/piepatch/upstream

		# corrects startfile/endfile selection and shared/static/pie flag usage
		EPATCH_MULTI_MSG="Applying upstream pie patches ..." \
		epatch "${WORKDIR}"/piepatch/upstream
		# adds non-default pie support (rs6000)
		EPATCH_MULTI_MSG="Applying non-default pie patches ..." \
		epatch "${WORKDIR}"/piepatch/nondef
		# adds default pie support (rs6000 too) if DEFAULT_PIE[_SSP] is defined
		EPATCH_MULTI_MSG="Applying default pie patches ..." \
		epatch "${WORKDIR}"/piepatch/def
	fi
		# we want to be able to control the pie patch logic via something other
		# than ALL_CFLAGS...
		sed -e '/^ALL_CFLAGS/iHARD_CFLAGS = ' \
			-e 's|^ALL_CFLAGS = |ALL_CFLAGS = $(HARD_CFLAGS) |' \
			-i "${S}"/gcc/Makefile.in

	BRANDING_GCC_PKGVERSION="${BRANDING_GCC_PKGVERSION}, pie-${PIE_VER}"
}

should_we_gcc_config() {
	# we always want to run gcc-config if we're bootstrapping, otherwise
	# we might get stuck with the c-only stage1 compiler
	use bootstrap && return 0
	use build && return 0

	# if the current config is invalid, we definitely want a new one
	# Note: due to bash quirkiness, the following must not be 1 line
	local curr_config
	curr_config=$(env -i ROOT="${ROOT}" gcc-config -c ${CTARGET} 2>&1) || return 0

	# if the previously selected config has the same major.minor (branch) as
	# the version we are installing, then it will probably be uninstalled
	# for being in the same SLOT, make sure we run gcc-config.
	local curr_config_ver=$(env -i ROOT="${ROOT}" gcc-config -S ${curr_config} | awk '{print $2}')

	local curr_branch_ver=$(get_version_component_range 1-2 ${curr_config_ver})

	# If we're using multislot, just run gcc-config if we're installing
	# to the same profile as the current one.
	use multislot && return $([[ ${curr_config_ver} == ${GCC_CONFIG_VER} ]])

	if [[ ${curr_branch_ver} == ${GCC_BRANCH_VER} ]] ; then
		return 0
	else
		# if we're installing a genuinely different compiler version,
		# we should probably tell the user -how- to switch to the new
		# gcc version, since we're not going to do it for him/her.
		# We don't want to switch from say gcc-3.3 to gcc-3.4 right in
		# the middle of an emerge operation (like an 'emerge -e world'
		# which could install multiple gcc versions).
		einfo "The current gcc config appears valid, so it will not be"
		einfo "automatically switched for you.	If you would like to"
		einfo "switch to the newly installed gcc version, do the"
		einfo "following:"
		echo
		einfo "gcc-config ${CTARGET}-${GCC_CONFIG_VER}"
		einfo "source /etc/profile"
		echo
		ebeep
		return 1
	fi
}

do_gcc_config() {
	if ! should_we_gcc_config ; then
		env -i ROOT="${ROOT}" gcc-config --use-old --force
		return 0
	fi

	local current_gcc_config="" current_specs="" use_specs=""

	current_gcc_config=$(env -i ROOT="${ROOT}" gcc-config -c ${CTARGET} 2>/dev/null)
	if [[ -n ${current_gcc_config} ]] ; then
		# figure out which specs-specific config is active
		current_specs=$(gcc-config -S ${current_gcc_config} | awk '{print $3}')
		[[ -n ${current_specs} ]] && use_specs=-${current_specs}
	fi
	if [[ -n ${use_specs} ]] && \
	   [[ ! -e ${ROOT}/etc/env.d/gcc/${CTARGET}-${GCC_CONFIG_VER}${use_specs} ]]
	then
		ewarn "The currently selected specs-specific gcc config,"
		ewarn "${current_specs}, doesn't exist anymore. This is usually"
		ewarn "due to enabling/disabling hardened or switching to a version"
		ewarn "of gcc that doesnt create multiple specs files. The default"
		ewarn "config will be used, and the previous preference forgotten."
		ebeep
		epause
		use_specs=""
	fi

	gcc-config ${CTARGET}-${GCC_CONFIG_VER}${use_specs}
}

# This function allows us to gentoo-ize gcc's version number and bugzilla
# URL without needing to use patches.
gcc_version_patch() {
	# gcc-4.3+ has configure flags (whoo!)
	tc_version_is_at_least 4.3 && return 0

	local version_string=${GCC_CONFIG_VER}
	[[ -n ${BRANCH_UPDATE} ]] && version_string="${version_string} ${BRANCH_UPDATE}"

	einfo "patching gcc version: ${version_string} (${BRANDING_GCC_PKGVERSION})"

	if grep -qs VERSUFFIX "${S}"/gcc/version.c ; then
		sed -i -e "s~VERSUFFIX \"\"~VERSUFFIX \" (${BRANDING_GCC_PKGVERSION})\"~" \
			"${S}"/gcc/version.c || die "failed to update VERSUFFIX with Gentoo branding"
	else
		version_string="${version_string} (${BRANDING_GCC_PKGVERSION})"
		sed -i -e "s~\(const char version_string\[\] = \"\).*\(\".*\)~\1$version_string\2~" \
			"${S}"/gcc/version.c || die "failed to update version.c with Gentoo branding."
	fi
	sed -i -e 's~gcc\.gnu\.org\/bugs\.html~bugs\.gentoo\.org\/~' \
		"${S}"/gcc/version.c || die "Failed to change the bug URL"
}

# This is a historical wart.  The original Gentoo/amd64 port used:
#    lib32 - 32bit binaries (x86)
#    lib64 - 64bit binaries (x86_64)
#    lib   - "native" binaries (a symlink to lib64)
# Most other distros use the logic (including mainline gcc):
#    lib   - 32bit binaries (x86)
#    lib64 - 64bit binaries (x86_64)
# Over time, Gentoo is migrating to the latter form.
#
# Unfortunately, due to distros picking the lib32 behavior, newer gcc
# versions will dynamically detect whether to use lib or lib32 for its
# 32bit multilib.  So, to keep the automagic from getting things wrong
# while people are transitioning from the old style to the new style,
# we always set the MULTILIB_OSDIRNAMES var for relevant targets.
setup_multilib_osdirnames() {
	is_multilib || return 0

	local config
	local libdirs="../lib64 ../lib32"

	# this only makes sense for some Linux targets
	case ${CTARGET} in
		x86_64*-linux*)    config="i386" ;;
		powerpc64*-linux*) config="rs6000" ;;
		sparc64*-linux*)   config="sparc" ;;
		s390x*-linux*)     config="s390" ;;
		*)	               return 0 ;;
	esac
	config+="/t-linux64"

	if [[ ${SYMLINK_LIB} == "yes" ]] ; then
		einfo "updating multilib directories to be: ${libdirs}"
		if tc_version_is_at_least 4.7 && [[ ${CTARGET} == x86_64*-linux* ]] ; then
			set -- -e '/^MULTILIB_OSDIRNAMES.*lib32/s:[$][(]if.*):../lib32:'
		else
			set -- -e "/^MULTILIB_OSDIRNAMES/s:=.*:= ${libdirs}:"
		fi
	else
		einfo "using upstream multilib; disabling lib32 autodetection"
		set -- -r -e 's:[$][(]if.*,(.*)[)]:\1:'
	fi
	sed -i "$@" "${S}"/gcc/config/${config} || die
}

disable_multilib_libjava() {
	if is_gcj ; then
		# We dont want a multilib libjava, so lets use this hack taken from fedora
		pushd "${S}" > /dev/null
		sed -i -e 's/^all: all-redirect/ifeq (\$(MULTISUBDIR),)\nall: all-redirect\nelse\nall:\n\techo Multilib libjava build disabled\nendif/' libjava/Makefile.in
		sed -i -e 's/^install: install-redirect/ifeq (\$(MULTISUBDIR),)\ninstall: install-redirect\nelse\ninstall:\n\techo Multilib libjava install disabled\nendif/' libjava/Makefile.in
		sed -i -e 's/^check: check-redirect/ifeq (\$(MULTISUBDIR),)\ncheck: check-redirect\nelse\ncheck:\n\techo Multilib libjava check disabled\nendif/' libjava/Makefile.in
		sed -i -e 's/^all: all-recursive/ifeq (\$(MULTISUBDIR),)\nall: all-recursive\nelse\nall:\n\techo Multilib libjava build disabled\nendif/' libjava/Makefile.in
		sed -i -e 's/^install: install-recursive/ifeq (\$(MULTISUBDIR),)\ninstall: install-recursive\nelse\ninstall:\n\techo Multilib libjava install disabled\nendif/' libjava/Makefile.in
		sed -i -e 's/^check: check-recursive/ifeq (\$(MULTISUBDIR),)\ncheck: check-recursive\nelse\ncheck:\n\techo Multilib libjava check disabled\nendif/' libjava/Makefile.in
		popd > /dev/null
	fi
}

# make sure the libtool archives have libdir set to where they actually
# -are-, and not where they -used- to be.  also, any dependencies we have
# on our own .la files need to be updated.
fix_libtool_libdir_paths() {
	pushd "${D}" >/dev/null

	pushd "./${1}" >/dev/null
	local dir="${PWD#${D%/}}"
	local allarchives=$(echo *.la)
	allarchives="\(${allarchives// /\\|}\)"
	popd >/dev/null

	sed -i \
		-e "/^libdir=/s:=.*:='${dir}':" \
		./${dir}/*.la
	sed -i \
		-e "/^dependency_libs=/s:/[^ ]*/${allarchives}:${LIBPATH}/\1:g" \
		$(find ./${PREFIX}/lib* -maxdepth 3 -name '*.la') \
		./${dir}/*.la

	popd >/dev/null
}

is_multilib() {
	[[ ${GCCMAJOR} < 3 ]] && return 1
	use multilib
}

is_cxx() {
	gcc-lang-supported 'c++' || return 1
	use cxx
}

is_d() {
	gcc-lang-supported d || return 1
	use_if_iuse d
}

is_f77() {
	gcc-lang-supported f77 || return 1
	use fortran
}

is_f95() {
	gcc-lang-supported f95 || return 1
	use fortran
}

is_fortran() {
	gcc-lang-supported fortran || return 1
	use fortran
}

is_gcj() {
	gcc-lang-supported java || return 1
	use cxx && use_if_iuse gcj
}

is_go() {
	gcc-lang-supported go || return 1
	use cxx && use_if_iuse go
}

is_libffi() {
	use_if_iuse libffi
}

is_objc() {
	gcc-lang-supported objc || return 1
	use_if_iuse objc
}

is_objcxx() {
	gcc-lang-supported 'obj-c++' || return 1
	use cxx && use_if_iuse objc++
}

is_ada() {
	gcc-lang-supported ada || return 1
	use ada
}

is_treelang() {
	use_if_iuse boundschecking && return 1 #260532
	is_crosscompile && return 1 #199924
	gcc-lang-supported treelang || return 1
	#use treelang
	return 0
}

# should kill these off once all the ebuilds are migrated
gcc_pkg_setup() { toolchain_pkg_setup ; }
gcc_src_unpack() { toolchain_src_unpack ; }
gcc_src_compile() { toolchain_src_compile ; }
gcc_src_test() { toolchain_src_test ; }