sys-devel/gcc-apple/gcc-apple-4.2.1_p5664.ebuild - chromiumos/overlays/portage - Git at Google

 # Copyright 1999-2016 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Id$

 EAPI="5"

 inherit eutils toolchain flag-o-matic autotools prefix

 GCC_VERS=${PV/_p*/}
 APPLE_VERS="${PV/*_p/}"
 DESCRIPTION="Apple branch of the GNU Compiler Collection, Developer Tools 3.2.3"
 HOMEPAGE="https://gcc.gnu.org"
 SRC_URI="http://www.opensource.apple.com/darwinsource/tarballs/other/gcc-${APPLE_VERS}.tar.gz
 		http://www.opensource.apple.com/darwinsource/tarballs/other/libstdcxx-16.tar.gz
 		http://www.opensource.apple.com/darwinsource/tarballs/other/libstdcxx-39.tar.gz
 		fortran? ( mirror://gnu/gcc/gcc-4.2.4/gcc-fortran-4.2.4.tar.bz2 )"
 LICENSE="GPL-2 GPL-3"

 SLOT="42"
 KEYWORDS="~ppc-macos ~x64-macos ~x86-macos"
 IUSE="fortran nls +openmp objc objc++ +cxx"

 RDEPEND=">=sys-libs/zlib-1.1.4
 	>=sys-libs/ncurses-5.2-r2
 	nls? ( sys-devel/gettext )
 	>=sys-devel/gcc-config-1.3.12-r4
 	fortran? (
 		>=dev-libs/gmp-4.2.1
 		>=dev-libs/mpfr-2.2.0_p10
 	)"
 DEPEND="${RDEPEND}
 	>=sys-apps/texinfo-4.2-r4
 	>=sys-devel/bison-1.875
 	${CATEGORY}/binutils-apple
 	>=dev-libs/mpfr-2.2.0_p10"

 S=${WORKDIR}/gcc-${APPLE_VERS}

 # TPREFIX is the prefix of the CTARGET installation
 export TPREFIX=${TPREFIX:-${EPREFIX}}

 src_unpack() {
 	# override toolchain.eclass func
 	unpack ${A}
 }

 src_prepare() {
 	# Support for fortran
 	if use fortran ; then
 		mv "${WORKDIR}"/gcc-4.2.4/gcc/fortran gcc/ || die
 		mv "${WORKDIR}"/gcc-4.2.4/libgfortran . || die
 		# from: substracted from http://r.research.att.com/tools/
 		epatch "${FILESDIR}"/${PN}-4.2.1_p5646-gfortran.patch
 	fi

 	# move in libstdc++
 	case ${CHOST} in
 		*-darwin1*|i?86-*-darwin9|powerpc-*-darwin9)
 			LIBSTDCXX_APPLE_VERSION=39
 		;;
 		*)
 			# pre Leopard has no dtrace, which is required by 37.11 and above
 			# Leopard only has 32-bits version of dtrace
 			LIBSTDCXX_APPLE_VERSION=16
 		;;
 	esac
 	mv "${WORKDIR}"/libstdcxx-${LIBSTDCXX_APPLE_VERSION}/libstdcxx/libstdc++-v3 .
 	if [[ ${LIBSTDCXX_APPLE_VERSION} == 16 ]] ; then
 		epatch "${FILESDIR}"/libstdc++-${LIBSTDCXX_APPLE_VERSION}.patch # does it apply on 37?
 		sed -i -e 's/__block\([^_]\)/__blk\1/g' \
 			libstdc++-v3/include/ext/mt_allocator.h \
 			libstdc++-v3/src/mt_allocator.cc || die "conflict fix failed"
 	fi

 	# we use our libtool
 	sed -i -e "s:/usr/bin/libtool:${EPREFIX}/usr/bin/${CTARGET}-libtool:" \
 		gcc/config/darwin.h || die "sed gcc/config/darwin.h failed"
 	# add prefixed Frameworks to default search paths (may want to change this
 	# in a cross-compile)
 	sed -i -e "/\"\/System\/Library\/Frameworks\"\,/i\ \   \"${EPREFIX}/Frameworks\"\, " \
 		gcc/config/darwin-c.c || die "sed  gcc/config/darwin-c.c failed"

 	# Workaround deprecated "+Nc" syntax for GNU tail(1)
 	sed -i -e "s:tail +16c:tail -c +16:g" \
 		gcc/Makefile.in || die "sed gcc/Makefile.in failed."

 	epatch "${FILESDIR}"/${PN}-4.0.1_p5465-default-altivec.patch

 	# dsymutil stuff breaks on 10.4/x86, revert it
 	[[ ${CHOST} == *86*-apple-darwin8 ]] && \
 		epatch "${FILESDIR}"/${PN}-${GCC_VERS}-dsymutil.patch

 	# bootstrapping might fail with host provided gcc on 10.4/x86
 	if ! is_crosscompile && ! echo "int main(){return 0;}" | gcc -o "${T}"/foo \
 		-mdynamic-no-pic -x c - >/dev/null 2>&1;
 	then
 		einfo "-mdynamic-no-pic doesn't work - disabling..."
 		echo "BOOT_CFLAGS=-g -O2" > config/mh-x86-darwin
 		XD=gcc/config/i386/x-darwin
 		awk 'BEGIN{x=1}{if ($0 ~ "use -mdynamic-no-pic to build x86")
 		{x=1-x} else if (x) print}' $XD > t && mv t $XD \
 			|| die "Failed to rewrite $XD"
 	fi

 	epatch "${FILESDIR}"/${PN}-4.2.1-prefix-search-dirs.patch
 	eprefixify "${S}"/gcc/gcc.c

 	if use !bootstrap ; then
 		# this only occurs with up-to-date tools from the Prefix, and actually
 		# breaks the bootstrap since the autoconf needs a very recent automake
 		epatch "${FILESDIR}"/${PN}-${GCC_VERS}-texinfo.patch
 		epatch "${FILESDIR}"/${PN}-${GCC_VERS}-autoconf-m4-precious.patch
 		cd "${S}"/gcc && eautoconf
 		cd "${S}"/libgomp && eautoconf
 	fi

 	local BRANDING_GCC_PKGVERSION="$(sed -n -e '/^#define VERSUFFIX/s/^[^"]*"\([^"]\+\)".*$/\1/p' "${S}"/gcc/version.c)"
 	BRANDING_GCC_PKGVERSION=${BRANDING_GCC_PKGVERSION/(/(Gentoo ${PVR}, }
 	einfo "patching gcc version: ${GCC_VERS}${BRANDING_GCC_PKGVERSION}"

 	sed -i -e "s~VERSUFFIX \"[^\"]*~VERSUFFIX \"${BRANDING_GCC_PKGVERSION}~" \
 		"${S}"/gcc/version.c || die "failed to update VERSUFFIX with Gentoo branding"
 	sed -i -e 's~developer\.apple\.com\/bugreporter~bugs\.gentoo\.org\/~' \
 		"${S}"/gcc/version.c || die "Failed to change the bug URL"
 }

 src_configure() {
 	local langs="c"
 	use cxx && langs="${langs},c++"
 	use objc && langs="${langs},objc"
 	use objc++ && langs="${langs/,objc/},objc,obj-c++" # need objc with objc++
 	use fortran && langs="${langs},fortran"

 	LIBPATH=${EPREFIX}/usr/lib/gcc/${CTARGET}/${GCC_VERS}
 	if is_crosscompile ; then
 		BINPATH=${EPREFIX}/usr/${CHOST}/${CTARGET}/gcc-bin/${GCC_VERS}
 	else
 		BINPATH=${EPREFIX}/usr/${CTARGET}/gcc-bin/${GCC_VERS}
 	fi
 	STDCXX_INCDIR=${LIBPATH}/include/g++-v${GCC_VERS/\.*/}

 	local myconf="${myconf} \
 		--prefix=${EPREFIX}/usr \
 		--bindir=${BINPATH} \
 		--includedir=${LIBPATH}/include \
 		--datadir=${EPREFIX}/usr/share/gcc-data/${CTARGET}/${GCC_VERS} \
 		--mandir=${EPREFIX}/usr/share/gcc-data/${CTARGET}/${GCC_VERS}/man \
 		--infodir=${EPREFIX}/usr/share/gcc-data/${CTARGET}/${GCC_VERS}/info \
 		--with-gxx-include-dir=${STDCXX_INCDIR} \
 		--host=${CHOST}
 		--enable-version-specific-runtime-libs"

 	if is_crosscompile ; 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."
 		myconf="${myconf} --target=${CTARGET}"

 		# Tell compiler where to find what it needs
 		myconf="${myconf} --with-sysroot=${EPREFIX}/usr/${CTARGET}"

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

 		local VAR="CFLAGS_"${CTARGET//-/_}
 		CXXFLAGS=${!VAR}
 	fi
 	[[ -n ${CBUILD} ]] && myconf="${myconf} --build=${CBUILD}"

 	# Native Language Support
 	if use nls ; then
 		myconf="${myconf} --enable-nls --without-included-gettext"
 	else
 		myconf="${myconf} --disable-nls"
 	fi

 	# reasonably sane globals (hopefully)
 	myconf="${myconf} \
 		--with-system-zlib \
 		--disable-checking \
 		--disable-werror"

 	# ???
 	myconf="${myconf} --enable-shared --enable-threads=posix"

 	# make clear we're in an offset
 	use prefix && myconf="${myconf} --with-local-prefix=${TPREFIX}/usr"

 	# we don't use a GNU linker, so tell GCC where to find the linker stuff we
 	# want it to use
 	myconf="${myconf} \
 		--with-as=${EPREFIX}/usr/bin/${CTARGET}-as \
 		--with-ld=${EPREFIX}/usr/bin/${CTARGET}-ld"

 	# make sure we never do multilib stuff, for that we need a different Prefix
 	[[ -z ${I_KNOW_WHAT_IM_DOING_I_WANT_APPLE_MULTILIB} ]] \
 		&& myconf="${myconf} --disable-multilib"

 	myconf="${myconf} --enable-languages=${langs} $(use_enable openmp libgomp)"

 	# The produced libgcc_s.dylib is faulty if using a bit too much
 	# optimisation.  Nail it down to something sane
 	CFLAGS="-O2 -pipe"
 	CXXFLAGS=${CFLAGS}

 	# https://gcc.gnu.org/ml/gcc-patches/2006-11/msg00765.html
 	# (won't hurt if already 64-bits, but is essential when coming from a
 	# multilib compiler -- the default)
 	[[ ${CTARGET} == powerpc64-* || ${CTARGET} == x86_64-* ]] && \
 		export CC="gcc -m64"

 	mkdir -p "${WORKDIR}"/build
 	cd "${WORKDIR}"/build
 	einfo "Configuring GCC with: ${myconf//--/\n\t--}"
 	"${S}"/configure ${myconf} || die "conf failed"
 }

 src_compile() {
 	cd "${WORKDIR}"/build || die
 	emake bootstrap || die "emake failed"
 }

 src_install() {
 	cd "${WORKDIR}"/build
 	# -jX doesn't work
 	emake -j1 DESTDIR="${D}" install || die

 	# Punt some tools which are really only useful while building gcc
 	find "${ED}" -name install-tools -prune -type d -exec rm -rf "{}" \;
 	# This one comes with binutils
 	find "${ED}" -name libiberty.a -exec rm -f "{}" \;

 	# 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 ${ED}"
 	fi

 	# create gcc-config entry
 	dodir /etc/env.d/gcc
 	local gcc_envd_base="/etc/env.d/gcc/${CHOST}-${GCC_VERS}"

 	gcc_envd_file="${ED}${gcc_envd_base}"

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

 	# we don't do multilib
 	LDPATH="${LIBPATH}"
 	echo "LDPATH=\"${LDPATH}\"" >> ${gcc_envd_file}
 	echo "MANPATH=\"${EPREFIX}/usr/share/gcc-data/${CHOST}/${GCC_VERS}/man\"" >> ${gcc_envd_file}
 	echo "INFOPATH=\"${EPREFIX}/usr/share/gcc-data/${CHOST}/${GCC_VERS}/info\"" >> ${gcc_envd_file}
 	echo "STDCXX_INCDIR=\"g++-v${GCC_VERS/\.*/}\"" >> ${gcc_envd_file}
 	is_crosscompile && echo "CTARGET=${CTARGET}" >> ${gcc_envd_file}

 	# 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 ; 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 ${BINPATH#${EPREFIX}}/${CTARGET}-${x} \
 				/usr/bin/${CTARGET}-${x}-${GCC_VERS}
 			dosym ${BINPATH#${EPREFIX}}/${CTARGET}-${x} \
 				/usr/bin/${x}-${GCC_VERS}
 		fi

 		if [[ -f ${CTARGET}-${x}-${GCC_VERS} ]] ; then
 			rm -f ${CTARGET}-${x}-${GCC_VERS}
 			ln -sf ${CTARGET}-${x} ${CTARGET}-${x}-${GCC_VERS}
 		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 ${ED}/usr/libexec/gcc ]] && \
 		env RESTRICT="" CHOST=${CHOST} prepstrip "${ED}/usr/libexec/gcc/${CTARGET}/${GCC_VERS}"

 	# prune empty dirs left behind
 	find "${ED}" -type d | xargs rmdir >& /dev/null
 }

 pkg_postinst() {
 	# beware this also switches when it's on another branch version of GCC
 	gcc-config ${CTARGET}-${GCC_VERS}
 }

 pkg_postrm() {
 	# clean up the cruft left behind by cross-compilers
 	if is_crosscompile ; then
 		if [[ -z $(ls "${EROOT}"/etc/env.d/gcc/${CTARGET}* 2>/dev/null) ]] ; then
 			rm -f "${EROOT}"/etc/env.d/gcc/config-${CTARGET}
 			rm -f "${EROOT}"/etc/env.d/??gcc-${CTARGET}
 			rm -f "${EROOT}"/usr/bin/${CTARGET}-{gcc,{g,c}++}{,32,64}
 		fi
 		return 0
 	fi
 }
	# Copyright 1999-2016 Gentoo Foundation
	# Distributed under the terms of the GNU General Public License v2
	# $Id$

	EAPI="5"

	inherit eutils toolchain flag-o-matic autotools prefix

	GCC_VERS=${PV/_p*/}
	APPLE_VERS="${PV/*_p/}"
	DESCRIPTION="Apple branch of the GNU Compiler Collection, Developer Tools 3.2.3"
	HOMEPAGE="https://gcc.gnu.org"
	SRC_URI="http://www.opensource.apple.com/darwinsource/tarballs/other/gcc-${APPLE_VERS}.tar.gz
	http://www.opensource.apple.com/darwinsource/tarballs/other/libstdcxx-16.tar.gz
	http://www.opensource.apple.com/darwinsource/tarballs/other/libstdcxx-39.tar.gz
	fortran? ( mirror://gnu/gcc/gcc-4.2.4/gcc-fortran-4.2.4.tar.bz2 )"
	LICENSE="GPL-2 GPL-3"

	SLOT="42"
	KEYWORDS="~ppc-macos ~x64-macos ~x86-macos"
	IUSE="fortran nls +openmp objc objc++ +cxx"

	RDEPEND=">=sys-libs/zlib-1.1.4
	>=sys-libs/ncurses-5.2-r2
	nls? ( sys-devel/gettext )
	>=sys-devel/gcc-config-1.3.12-r4
	fortran? (
	>=dev-libs/gmp-4.2.1
	>=dev-libs/mpfr-2.2.0_p10
	)"
	DEPEND="${RDEPEND}
	>=sys-apps/texinfo-4.2-r4
	>=sys-devel/bison-1.875
	${CATEGORY}/binutils-apple
	>=dev-libs/mpfr-2.2.0_p10"

	S=${WORKDIR}/gcc-${APPLE_VERS}

	# TPREFIX is the prefix of the CTARGET installation
	export TPREFIX=${TPREFIX:-${EPREFIX}}

	src_unpack() {
	# override toolchain.eclass func
	unpack ${A}
	}

	src_prepare() {
	# Support for fortran
	if use fortran ; then
	mv "${WORKDIR}"/gcc-4.2.4/gcc/fortran gcc/ \|\| die
	mv "${WORKDIR}"/gcc-4.2.4/libgfortran . \|\| die
	# from: substracted from http://r.research.att.com/tools/
	epatch "${FILESDIR}"/${PN}-4.2.1_p5646-gfortran.patch
	fi

	# move in libstdc++
	case ${CHOST} in
	-darwin1\|i?86--darwin9\|powerpc--darwin9)
	LIBSTDCXX_APPLE_VERSION=39
	;;
	*)
	# pre Leopard has no dtrace, which is required by 37.11 and above
	# Leopard only has 32-bits version of dtrace
	LIBSTDCXX_APPLE_VERSION=16
	;;
	esac
	mv "${WORKDIR}"/libstdcxx-${LIBSTDCXX_APPLE_VERSION}/libstdcxx/libstdc++-v3 .
	if [[ ${LIBSTDCXX_APPLE_VERSION} == 16 ]] ; then
	epatch "${FILESDIR}"/libstdc++-${LIBSTDCXX_APPLE_VERSION}.patch # does it apply on 37?
	sed -i -e 's/__block\([^_]\)/__blk\1/g' \
	libstdc++-v3/include/ext/mt_allocator.h \
	libstdc++-v3/src/mt_allocator.cc \|\| die "conflict fix failed"
	fi

	# we use our libtool
	sed -i -e "s:/usr/bin/libtool:${EPREFIX}/usr/bin/${CTARGET}-libtool:" \
	gcc/config/darwin.h \|\| die "sed gcc/config/darwin.h failed"
	# add prefixed Frameworks to default search paths (may want to change this
	# in a cross-compile)
	sed -i -e "/\"\/System\/Library\/Frameworks\"\,/i\ \ \"${EPREFIX}/Frameworks\"\, " \
	gcc/config/darwin-c.c \|\| die "sed gcc/config/darwin-c.c failed"

	# Workaround deprecated "+Nc" syntax for GNU tail(1)
	sed -i -e "s:tail +16c:tail -c +16:g" \
	gcc/Makefile.in \|\| die "sed gcc/Makefile.in failed."

	epatch "${FILESDIR}"/${PN}-4.0.1_p5465-default-altivec.patch

	# dsymutil stuff breaks on 10.4/x86, revert it
	[[ ${CHOST} == 86-apple-darwin8 ]] && \
	epatch "${FILESDIR}"/${PN}-${GCC_VERS}-dsymutil.patch

	# bootstrapping might fail with host provided gcc on 10.4/x86
	if ! is_crosscompile && ! echo "int main(){return 0;}" \| gcc -o "${T}"/foo \
	-mdynamic-no-pic -x c - >/dev/null 2>&1;
	then
	einfo "-mdynamic-no-pic doesn't work - disabling..."
	echo "BOOT_CFLAGS=-g -O2" > config/mh-x86-darwin
	XD=gcc/config/i386/x-darwin
	awk 'BEGIN{x=1}{if ($0 ~ "use -mdynamic-no-pic to build x86")
	{x=1-x} else if (x) print}' $XD > t && mv t $XD \
	\|\| die "Failed to rewrite $XD"
	fi

	epatch "${FILESDIR}"/${PN}-4.2.1-prefix-search-dirs.patch
	eprefixify "${S}"/gcc/gcc.c

	if use !bootstrap ; then
	# this only occurs with up-to-date tools from the Prefix, and actually
	# breaks the bootstrap since the autoconf needs a very recent automake
	epatch "${FILESDIR}"/${PN}-${GCC_VERS}-texinfo.patch
	epatch "${FILESDIR}"/${PN}-${GCC_VERS}-autoconf-m4-precious.patch
	cd "${S}"/gcc && eautoconf
	cd "${S}"/libgomp && eautoconf
	fi

	local BRANDING_GCC_PKGVERSION="$(sed -n -e '/^#define VERSUFFIX/s/^[^"]"\([^"]\+\)".$/\1/p' "${S}"/gcc/version.c)"
	BRANDING_GCC_PKGVERSION=${BRANDING_GCC_PKGVERSION/(/(Gentoo ${PVR}, }
	einfo "patching gcc version: ${GCC_VERS}${BRANDING_GCC_PKGVERSION}"

	sed -i -e "s~VERSUFFIX \"[^\"]*~VERSUFFIX \"${BRANDING_GCC_PKGVERSION}~" \
	"${S}"/gcc/version.c \|\| die "failed to update VERSUFFIX with Gentoo branding"
	sed -i -e 's~developer\.apple\.com\/bugreporter~bugs\.gentoo\.org\/~' \
	"${S}"/gcc/version.c \|\| die "Failed to change the bug URL"
	}

	src_configure() {
	local langs="c"
	use cxx && langs="${langs},c++"
	use objc && langs="${langs},objc"
	use objc++ && langs="${langs/,objc/},objc,obj-c++" # need objc with objc++
	use fortran && langs="${langs},fortran"

	LIBPATH=${EPREFIX}/usr/lib/gcc/${CTARGET}/${GCC_VERS}
	if is_crosscompile ; then
	BINPATH=${EPREFIX}/usr/${CHOST}/${CTARGET}/gcc-bin/${GCC_VERS}
	else
	BINPATH=${EPREFIX}/usr/${CTARGET}/gcc-bin/${GCC_VERS}
	fi
	STDCXX_INCDIR=${LIBPATH}/include/g++-v${GCC_VERS/\.*/}

	local myconf="${myconf} \
	--prefix=${EPREFIX}/usr \
	--bindir=${BINPATH} \
	--includedir=${LIBPATH}/include \
	--datadir=${EPREFIX}/usr/share/gcc-data/${CTARGET}/${GCC_VERS} \
	--mandir=${EPREFIX}/usr/share/gcc-data/${CTARGET}/${GCC_VERS}/man \
	--infodir=${EPREFIX}/usr/share/gcc-data/${CTARGET}/${GCC_VERS}/info \
	--with-gxx-include-dir=${STDCXX_INCDIR} \
	--host=${CHOST}
	--enable-version-specific-runtime-libs"

	if is_crosscompile ; 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."
	myconf="${myconf} --target=${CTARGET}"

	# Tell compiler where to find what it needs
	myconf="${myconf} --with-sysroot=${EPREFIX}/usr/${CTARGET}"

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

	local VAR="CFLAGS_"${CTARGET//-/_}
	CXXFLAGS=${!VAR}
	fi
	[[ -n ${CBUILD} ]] && myconf="${myconf} --build=${CBUILD}"

	# Native Language Support
	if use nls ; then
	myconf="${myconf} --enable-nls --without-included-gettext"
	else
	myconf="${myconf} --disable-nls"
	fi

	# reasonably sane globals (hopefully)
	myconf="${myconf} \
	--with-system-zlib \
	--disable-checking \
	--disable-werror"

	# ???
	myconf="${myconf} --enable-shared --enable-threads=posix"

	# make clear we're in an offset
	use prefix && myconf="${myconf} --with-local-prefix=${TPREFIX}/usr"

	# we don't use a GNU linker, so tell GCC where to find the linker stuff we
	# want it to use
	myconf="${myconf} \
	--with-as=${EPREFIX}/usr/bin/${CTARGET}-as \
	--with-ld=${EPREFIX}/usr/bin/${CTARGET}-ld"

	# make sure we never do multilib stuff, for that we need a different Prefix
	[[ -z ${I_KNOW_WHAT_IM_DOING_I_WANT_APPLE_MULTILIB} ]] \
	&& myconf="${myconf} --disable-multilib"

	myconf="${myconf} --enable-languages=${langs} $(use_enable openmp libgomp)"

	# The produced libgcc_s.dylib is faulty if using a bit too much
	# optimisation. Nail it down to something sane
	CFLAGS="-O2 -pipe"
	CXXFLAGS=${CFLAGS}

	# https://gcc.gnu.org/ml/gcc-patches/2006-11/msg00765.html
	# (won't hurt if already 64-bits, but is essential when coming from a
	# multilib compiler -- the default)
	[[ ${CTARGET} == powerpc64-* \|\| ${CTARGET} == x86_64-* ]] && \
	export CC="gcc -m64"

	mkdir -p "${WORKDIR}"/build
	cd "${WORKDIR}"/build
	einfo "Configuring GCC with: ${myconf//--/\n\t--}"
	"${S}"/configure ${myconf} \|\| die "conf failed"
	}

	src_compile() {
	cd "${WORKDIR}"/build \|\| die
	emake bootstrap \|\| die "emake failed"
	}

	src_install() {
	cd "${WORKDIR}"/build
	# -jX doesn't work
	emake -j1 DESTDIR="${D}" install \|\| die

	# Punt some tools which are really only useful while building gcc
	find "${ED}" -name install-tools -prune -type d -exec rm -rf "{}" \;
	# This one comes with binutils
	find "${ED}" -name libiberty.a -exec rm -f "{}" \;

	# 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 ${ED}"
	fi

	# create gcc-config entry
	dodir /etc/env.d/gcc
	local gcc_envd_base="/etc/env.d/gcc/${CHOST}-${GCC_VERS}"

	gcc_envd_file="${ED}${gcc_envd_base}"

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

	# we don't do multilib
	LDPATH="${LIBPATH}"
	echo "LDPATH=\"${LDPATH}\"" >> ${gcc_envd_file}
	echo "MANPATH=\"${EPREFIX}/usr/share/gcc-data/${CHOST}/${GCC_VERS}/man\"" >> ${gcc_envd_file}
	echo "INFOPATH=\"${EPREFIX}/usr/share/gcc-data/${CHOST}/${GCC_VERS}/info\"" >> ${gcc_envd_file}
	echo "STDCXX_INCDIR=\"g++-v${GCC_VERS/\.*/}\"" >> ${gcc_envd_file}
	is_crosscompile && echo "CTARGET=${CTARGET}" >> ${gcc_envd_file}

	# 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 ; 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 ${BINPATH#${EPREFIX}}/${CTARGET}-${x} \
	/usr/bin/${CTARGET}-${x}-${GCC_VERS}
	dosym ${BINPATH#${EPREFIX}}/${CTARGET}-${x} \
	/usr/bin/${x}-${GCC_VERS}
	fi

	if [[ -f ${CTARGET}-${x}-${GCC_VERS} ]] ; then
	rm -f ${CTARGET}-${x}-${GCC_VERS}
	ln -sf ${CTARGET}-${x} ${CTARGET}-${x}-${GCC_VERS}
	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 ${ED}/usr/libexec/gcc ]] && \
	env RESTRICT="" CHOST=${CHOST} prepstrip "${ED}/usr/libexec/gcc/${CTARGET}/${GCC_VERS}"

	# prune empty dirs left behind
	find "${ED}" -type d \| xargs rmdir >& /dev/null
	}

	pkg_postinst() {
	# beware this also switches when it's on another branch version of GCC
	gcc-config ${CTARGET}-${GCC_VERS}
	}

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