[gentoo-commits] proj/musl:master commit in: eclass/

["Sam James" <sam@gentoo.org>]

commit:     0ac64cdad64f51dd81e34f9d4eb279d570670a73
Author:     Sam James <sam <AT> gentoo <DOT> org>
AuthorDate: Wed Nov 17 11:44:04 2021 +0000
Commit:     Sam James <sam <AT> gentoo <DOT> org>
CommitDate: Wed Nov 17 11:46:32 2021 +0000
URL:        https://gitweb.gentoo.org/proj/musl.git/commit/?id=0ac64cda

toolchain.eclass: import eclass with proposed ::gentoo changes (musl patchset)

Introduce a MUSL_VER patch variable and apply a patchset like we used to
for uclibc. This is in preparation for moving GCC from ::musl to
::gentoo.

The patchset has a nocross/ dir for patches which must
be applied only for native builds.

The patches were/are identical for each version in ::musl
which makes life easier:
```
musl/
musl/gcc-pure64.patch
musl/posix_memalign.patch
musl/nocross/
musl/nocross/gcc-6.1-musl-libssp.patch
musl/cpu_indicator.patch
```

Signed-off-by: Sam James <sam <AT> gentoo.org>

 eclass/toolchain.eclass | 2391 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 2391 insertions(+)

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
new file mode 100644
index 00000000..39466996
--- /dev/null
+++ b/eclass/toolchain.eclass
@@ -0,0 +1,2391 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: toolchain.eclass
+# @MAINTAINER:
+# Toolchain Ninjas <toolchain@gentoo.org>
+# @SUPPORTED_EAPIS: 5 6 7 8
+# @BLURB: Common code for sys-devel/gcc ebuilds
+
+DESCRIPTION="The GNU Compiler Collection"
+HOMEPAGE="https://gcc.gnu.org/"
+
+inherit flag-o-matic gnuconfig libtool multilib pax-utils toolchain-funcs prefix
+
+tc_is_live() {
+	[[ ${PV} == *9999* ]]
+}
+
+if tc_is_live ; then
+	EGIT_REPO_URI="https://gcc.gnu.org/git/gcc.git"
+	# naming style:
+	# gcc-10.1.0_pre9999 -> gcc-10-branch
+	#  Note that the micro version is required or lots of stuff will break.
+	#  To checkout master set gcc_LIVE_BRANCH="master" in the ebuild before
+	#  inheriting this eclass.
+	EGIT_BRANCH="releases/${PN}-${PV%.?.?_pre9999}"
+	EGIT_BRANCH=${EGIT_BRANCH//./_}
+	inherit git-r3
+fi
+
+FEATURES=${FEATURES/multilib-strict/}
+
+case ${EAPI} in
+	5|6) inherit eapi7-ver eutils ;;
+	7) inherit eutils ;;
+	8) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
+esac
+
+EXPORT_FUNCTIONS pkg_pretend pkg_setup src_unpack src_prepare src_configure \
+	src_compile src_test src_install pkg_postinst pkg_postrm
+
+#---->> globals <<----
+
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} = ${CHOST} ]] ; then
+	if [[ ${CATEGORY} == cross-* ]] ; then
+		export CTARGET=${CATEGORY#cross-}
+	fi
+fi
+: ${TARGET_ABI:=${ABI}}
+: ${TARGET_MULTILIB_ABIS:=${MULTILIB_ABIS}}
+: ${TARGET_DEFAULT_ABI:=${DEFAULT_ABI}}
+
+is_crosscompile() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+
+# General purpose version check.  Without a second arg matches up to minor version (x.x.x)
+tc_version_is_at_least() {
+	ver_test "${2:-${GCC_RELEASE_VER}}" -ge "$1"
+}
+
+# General purpose version range check
+# Note that it matches up to but NOT including the second version
+tc_version_is_between() {
+	tc_version_is_at_least "${1}" && ! tc_version_is_at_least "${2}"
+}
+
+GCC_PV=${TOOLCHAIN_GCC_PV:-${PV}}
+GCC_PVR=${GCC_PV}
+[[ ${PR} != "r0" ]] && GCC_PVR=${GCC_PVR}-${PR}
+
+# GCC_RELEASE_VER must always match 'gcc/BASE-VER' value.
+# It's an internal representation of gcc version used for:
+# - versioned paths on disk
+# - 'gcc -dumpversion' output. Must always match <digit>.<digit>.<digit>.
+GCC_RELEASE_VER=$(ver_cut 1-3 ${GCC_PV})
+
+GCC_BRANCH_VER=$(ver_cut 1-2 ${GCC_PV})
+GCCMAJOR=$(ver_cut 1 ${GCC_PV})
+GCCMINOR=$(ver_cut 2 ${GCC_PV})
+GCCMICRO=$(ver_cut 3 ${GCC_PV})
+
+# Ideally this variable should allow for custom gentoo versioning
+# of binary and gcc-config names not directly tied to upstream
+# versioning. In practive it's hard to untangle from gcc/BASE-VER
+# (GCC_RELEASE_VER) value.
+GCC_CONFIG_VER=${GCC_RELEASE_VER}
+
+# Pre-release support. Versioning schema:
+# 1.0.0_pre9999: live ebuild
+# 1.2.3_alphaYYYYMMDD: weekly snapshots
+# 1.2.3_rcYYYYMMDD: release candidates
+if [[ ${GCC_PV} == *_alpha* ]] ; then
+	# weekly snapshots
+	SNAPSHOT=${GCCMAJOR}-${GCC_PV##*_alpha}
+elif [[ ${GCC_PV} == *_rc* ]] ; then
+	# release candidates
+	SNAPSHOT=${GCC_PV%_rc*}-RC-${GCC_PV##*_rc}
+fi
+
+# Require minimum gcc version to simplify assumptions.
+# Normally we would require gcc-6+ (based on sys-devel/gcc)
+# but we still have sys-devel/gcc-apple-4.2.1_p5666.
+tc_version_is_at_least 4.2.1 || die "${ECLASS}: ${GCC_RELEASE_VER} is too old."
+
+PREFIX=${TOOLCHAIN_PREFIX:-${EPREFIX}/usr}
+
+LIBPATH=${TOOLCHAIN_LIBPATH:-${PREFIX}/lib/gcc/${CTARGET}/${GCC_CONFIG_VER}}
+INCLUDEPATH=${TOOLCHAIN_INCLUDEPATH:-${LIBPATH}/include}
+
+if is_crosscompile ; then
+	BINPATH=${TOOLCHAIN_BINPATH:-${PREFIX}/${CHOST}/${CTARGET}/gcc-bin/${GCC_CONFIG_VER}}
+	HOSTLIBPATH=${PREFIX}/${CHOST}/${CTARGET}/lib/${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/\.*/}}
+
+#---->> LICENSE+SLOT+IUSE logic <<----
+
+LICENSE="GPL-3+ LGPL-3+ || ( GPL-3+ libgcc libstdc++ gcc-runtime-library-exception-3.1 ) FDL-1.3+"
+IUSE="test vanilla +nls"
+RESTRICT="!test? ( test )"
+
+tc_supports_dostrip() {
+	case ${EAPI} in
+		5|6) return 1 ;;
+		7|8) return 0 ;;
+		*) die "Update apply_patches() for ${EAPI}." ;;
+	esac
+}
+
+tc_supports_dostrip || RESTRICT+=" strip" # cross-compilers need controlled stripping
+
+TC_FEATURES=()
+
+tc_has_feature() {
+	has "$1" "${TC_FEATURES[@]}"
+}
+
+if [[ ${PN} != "kgcc64" && ${PN} != gcc-* ]] ; then
+	IUSE+=" debug +cxx +nptl" TC_FEATURES+=(nptl)
+	[[ -n ${PIE_VER} ]] && IUSE+=" nopie"
+	[[ -n ${SPECS_VER} ]] && IUSE+=" nossp"
+	IUSE+=" +fortran" TC_FEATURES+=(fortran)
+	IUSE+=" doc hardened multilib objc"
+	tc_version_is_between 3 7 && IUSE+=" awt gcj" TC_FEATURES+=(gcj)
+	IUSE+=" pgo"
+	IUSE+=" objc-gc" TC_FEATURES+=(objc-gc)
+	IUSE+=" libssp objc++"
+	IUSE+=" +openmp"
+	tc_version_is_at_least 4.3 && IUSE+=" fixed-point"
+	tc_version_is_at_least 4.7 && IUSE+=" go"
+	# sanitizer support appeared in gcc-4.8, but <gcc-5 does not
+	# support modern glibc.
+	tc_version_is_at_least 5 && IUSE+=" +sanitize"  TC_FEATURES+=(sanitize)
+	# Note:
+	#   <gcc-4.8 supported graphite, it required forked ppl
+	#     versions which we dropped.  Since graphite was also experimental in
+	#     the older versions, we don't want to bother supporting it.  #448024
+	#   <gcc-5 supported graphite, it required cloog
+	#   <gcc-6.5 supported graphite, it required old incompatible isl
+	tc_version_is_at_least 6.5 &&
+		IUSE+=" graphite" TC_FEATURES+=(graphite)
+	tc_version_is_between 4.9 8 && IUSE+=" cilk"
+	tc_version_is_at_least 4.9 && IUSE+=" ada"
+	tc_version_is_at_least 4.9 && IUSE+=" vtv"
+	tc_version_is_at_least 5.0 && IUSE+=" jit"
+	tc_version_is_between 5.0 9 && IUSE+=" mpx"
+	tc_version_is_at_least 6.0 && IUSE+=" +pie +ssp +pch"
+	# systemtap is a gentoo-specific switch: bug #654748
+	tc_version_is_at_least 8.0 &&
+		IUSE+=" systemtap" TC_FEATURES+=(systemtap)
+	tc_version_is_at_least 9.0 && IUSE+=" d"
+	tc_version_is_at_least 9.1 && IUSE+=" lto"
+	tc_version_is_at_least 10 && IUSE+=" zstd" TC_FEATURES+=(zstd)
+	tc_version_is_at_least 11 && IUSE+=" valgrind" TC_FEATURES+=(valgrind)
+	tc_version_is_at_least 11 && IUSE+=" custom-cflags"
+fi
+
+if tc_version_is_at_least 10; then
+	# Note: currently we pull in releases, snapshots and
+	# git versions into the same SLOT.
+	SLOT="${GCCMAJOR}"
+else
+	SLOT="${GCC_CONFIG_VER}"
+fi
+
+#---->> DEPEND <<----
+
+RDEPEND="sys-libs/zlib
+	virtual/libiconv
+	nls? ( virtual/libintl )
+"
+
+GMP_MPFR_DEPS=">=dev-libs/gmp-4.3.2:0= >=dev-libs/mpfr-2.4.2:0="
+if tc_version_is_at_least 4.3 ; then
+	RDEPEND+=" ${GMP_MPFR_DEPS}"
+elif tc_has_feature fortran ; then
+	RDEPEND+=" fortran? ( ${GMP_MPFR_DEPS} )"
+fi
+
+tc_version_is_at_least 4.5 && RDEPEND+=" >=dev-libs/mpc-0.8.1:0="
+
+if tc_has_feature objc-gc ; then
+	if tc_version_is_at_least 7 ; then
+		RDEPEND+=" objc-gc? ( >=dev-libs/boehm-gc-7.4.2 )"
+	fi
+fi
+
+if tc_has_feature graphite ; then
+	RDEPEND+=" graphite? ( >=dev-libs/isl-0.14:0= )"
+fi
+
+BDEPEND="
+	>=sys-devel/bison-1.875
+	>=sys-devel/flex-2.5.4
+	nls? ( sys-devel/gettext )
+	test? (
+		>=dev-util/dejagnu-1.4.4
+		>=sys-devel/autogen-5.5.4
+	)"
+DEPEND="${RDEPEND}"
+
+if tc_has_feature gcj ; then
+	DEPEND+="
+		gcj? (
+			awt? (
+				x11-base/xorg-proto
+				x11-libs/libXt
+				x11-libs/libX11
+				x11-libs/libXtst
+				=x11-libs/gtk+-2*
+				x11-libs/pango
+				virtual/pkgconfig
+			)
+			>=media-libs/libart_lgpl-2.1
+			app-arch/zip
+			app-arch/unzip
+		)
+	"
+fi
+
+if tc_has_feature sanitize ; then
+	# libsanitizer relies on 'crypt.h' to be present
+	# on target. glibc user to provide it unconditionally.
+	# Nowadays it's a standalone library: #802648
+	DEPEND+=" sanitize? ( virtual/libcrypt )"
+fi
+
+if tc_has_feature systemtap ; then
+	# gcc needs sys/sdt.h headers on target
+	DEPEND+=" systemtap? ( dev-util/systemtap )"
+fi
+
+if tc_has_feature zstd ; then
+	DEPEND+=" zstd? ( app-arch/zstd )"
+fi
+
+if tc_has_feature valgrind; then
+	BDEPEND+=" valgrind? ( dev-util/valgrind )"
+fi
+
+case ${EAPI} in
+	5|6) DEPEND+=" ${BDEPEND}" ;;
+esac
+
+PDEPEND=">=sys-devel/gcc-config-2.3"
+
+#---->> S + SRC_URI essentials <<----
+
+# Set the source directory depending on whether we're using
+# a live git tree, snapshot, or release tarball.
+S=$(
+	if tc_is_live ; then
+		echo ${EGIT_CHECKOUT_DIR}
+	elif [[ -n ${SNAPSHOT} ]] ; then
+		echo ${WORKDIR}/gcc-${SNAPSHOT}
+	else
+		echo ${WORKDIR}/gcc-${GCC_RELEASE_VER}
+	fi
+)
+
+gentoo_urls() {
+	local devspace="HTTP~vapier/dist/URI HTTP~rhill/dist/URI
+	HTTP~zorry/patches/gcc/URI HTTP~blueness/dist/URI
+	HTTP~tamiko/distfiles/URI HTTP~sam/distfiles/URI
+	HTTP~sam/distfiles/sys-devel/gcc/URI HTTP~slyfox/distfiles/URI"
+	devspace=${devspace//HTTP/https:\/\/dev.gentoo.org\/}
+	echo mirror://gentoo/$1 ${devspace//URI/$1}
+}
+
+# This function handles the basics of setting the SRC_URI for a gcc ebuild.
+# To use, set SRC_URI with:
+#
+#	SRC_URI="$(get_gcc_src_uri)"
+#
+# Other than the variables normally set by portage, this function's behavior
+# can be altered by setting the following:
+#
+#	GCC_TARBALL_SRC_URI
+#			Override link to main tarball into SRC_URI. Used by dev-lang/gnat-gpl
+#			to provide gcc tarball snapshots. Patches are usually reused as-is.
+#
+#	SNAPSHOT
+#			If set, this variable signals that we should be using a snapshot of
+#			gcc. 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.
+#
+#	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-${PATCH_VER}.tar.bz2
+#
+#	PIE_VER
+#	PIE_GCC_VER
+#			These variables control patching in various updates for the logic
+#			controlling Position Independant Executables. PIE_VER is expected
+#			to be the version of this patch, and PIE_GCC_VER the gcc version of
+#			the patch:
+#			An example:
+#					PIE_VER="8.7.6.5"
+#					PIE_GCC_VER="3.4.0"
+#			The resulting filename of this tarball will be:
+#			gcc-${PIE_GCC_VER:-${GCC_RELEASE_VER}}-piepatches-v${PIE_VER}.tar.bz2
+#
+#	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-${SPECS_VER}.tar.bz2
+#
+#	CYGWINPORTS_GITREV
+#			If set, this variable signals that we should apply additional patches
+#			maintained by upstream Cygwin developers at github/cygwinports/gcc,
+#			using the specified git commit id there.  The list of patches to
+#			apply is extracted from gcc.cygport, maintained there as well.
+#			This is done for compilers running on Cygwin, not for cross compilers
+#			with a Cygwin target.
+get_gcc_src_uri() {
+	export PATCH_GCC_VER=${PATCH_GCC_VER:-${GCC_RELEASE_VER}}
+	export UCLIBC_GCC_VER=${UCLIBC_GCC_VER:-${PATCH_GCC_VER}}
+	export MUSL_GCC_VER=${MUSL_GCC_VER:-${PATCH_GCC_VER}}
+	export PIE_GCC_VER=${PIE_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
+	# live git tree, snapshot, or release tarball.
+	if tc_is_live ; then
+		: # Nothing to do w/git snapshots.
+	elif [[ -n ${GCC_TARBALL_SRC_URI} ]] ; then
+		# pull gcc tarball from another location. Frequently used by gnat-gpl.
+		GCC_SRC_URI="${GCC_TARBALL_SRC_URI}"
+	elif [[ -n ${SNAPSHOT} ]] ; then
+		GCC_SRC_URI="ftp://gcc.gnu.org/pub/gcc/snapshots/${SNAPSHOT}/gcc-${SNAPSHOT}.tar.xz"
+	else
+		if tc_version_is_between 5.5 6 || tc_version_is_between 6.4 7 || tc_version_is_at_least 7.2 ; then
+			GCC_SRC_URI="mirror://gnu/gcc/gcc-${GCC_PV}/gcc-${GCC_RELEASE_VER}.tar.xz"
+		else
+			GCC_SRC_URI="mirror://gnu/gcc/gcc-${GCC_PV}/gcc-${GCC_RELEASE_VER}.tar.bz2"
+		fi
+	fi
+
+	[[ -n ${UCLIBC_VER} ]] && \
+		GCC_SRC_URI+=" $(gentoo_urls gcc-${UCLIBC_GCC_VER}-uclibc-patches-${UCLIBC_VER}.tar.bz2)"
+	[[ -n ${PATCH_VER} ]] && \
+		GCC_SRC_URI+=" $(gentoo_urls gcc-${PATCH_GCC_VER}-patches-${PATCH_VER}.tar.bz2)"
+	[[ -n ${MUSL_VER} ]] && \
+		GCC_SRC_URI+=" $(gentoo_urls gcc-${MUSL_GCC_VER}-musl-patches-${MUSL_VER}.tar.bz2)"
+
+	[[ -n ${PIE_VER} ]] && \
+		PIE_CORE=${PIE_CORE:-gcc-${PIE_GCC_VER}-piepatches-v${PIE_VER}.tar.bz2} && \
+		GCC_SRC_URI+=" $(gentoo_urls ${PIE_CORE})"
+
+	# gcc minispec for the hardened gcc 4 compiler
+	[[ -n ${SPECS_VER} ]] && \
+		GCC_SRC_URI+=" $(gentoo_urls gcc-${SPECS_GCC_VER}-specs-${SPECS_VER}.tar.bz2)"
+
+	if tc_has_feature gcj ; then
+		if tc_version_is_at_least 4.5 ; then
+			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+=" gcj? ( ftp://sourceware.org/pub/java/ecj-4.3.jar )"
+		fi
+	fi
+
+	# Cygwin patches from https://github.com/cygwinports/gcc
+	[[ -n ${CYGWINPORTS_GITREV} ]] && \
+		GCC_SRC_URI+=" elibc_Cygwin? ( https://github.com/cygwinports/gcc/archive/${CYGWINPORTS_GITREV}.tar.gz
+			-> gcc-cygwinports-${CYGWINPORTS_GITREV}.tar.gz )"
+
+	echo "${GCC_SRC_URI}"
+}
+
+SRC_URI=$(get_gcc_src_uri)
+
+#---->> pkg_pretend <<----
+
+toolchain_pkg_pretend() {
+	if ! _tc_use_if_iuse cxx ; then
+		_tc_use_if_iuse go && \
+			ewarn 'Go requires a C++ compiler, disabled due to USE="-cxx"'
+		_tc_use_if_iuse objc++ && \
+			ewarn 'Obj-C++ requires a C++ compiler, disabled due to USE="-cxx"'
+		_tc_use_if_iuse gcj && \
+			ewarn 'GCJ requires a C++ compiler, disabled due to USE="-cxx"'
+	fi
+
+	want_minispecs
+}
+
+#---->> pkg_setup <<----
+
+toolchain_pkg_setup() {
+	# we dont want to use the installed compiler's specs to build gcc
+	unset GCC_SPECS
+	unset LANGUAGES #265283
+}
+
+#---->> src_unpack <<----
+
+toolchain_src_unpack() {
+	if tc_is_live ; then
+		git-r3_src_unpack
+	fi
+
+	default_src_unpack
+}
+
+#---->> src_prepare <<----
+
+# 'epatch' is not available in EAPI=7. Abstract away patchset application
+# until we eventually get all gcc ebuilds on EAPI=7 or later.
+tc_apply_patches() {
+	[[ ${#@} -lt 2 ]] && die "usage: tc_apply_patches <message> <patches...>"
+
+	einfo "$1"; shift
+
+	case ${EAPI} in
+		# Note: even for EAPI=6 we used 'epatch' semantics. To avoid
+		# breaking existing ebuilds use 'eapply' only in EAPI=7 or later.
+		5|6) epatch "$@" ;;
+		7|8) eapply "$@" ;;
+		*) die "Update apply_patches() for ${EAPI}." ;;
+	esac
+}
+
+toolchain_src_prepare() {
+	export BRANDING_GCC_PKGVERSION="Gentoo ${GCC_PVR}"
+	cd "${S}"
+
+	do_gcc_gentoo_patches
+	do_gcc_PIE_patches
+	do_gcc_CYGWINPORTS_patches
+
+	if tc_is_live ; then
+		BRANDING_GCC_PKGVERSION="${BRANDING_GCC_PKGVERSION}, commit ${EGIT_VERSION}"
+	fi
+
+	case ${EAPI} in
+		5) epatch_user;;
+		6|7|8) eapply_user ;;
+		*) die "Update toolchain_src_prepare() for ${EAPI}." ;;
+	esac
+
+	if ( tc_version_is_at_least 4.8.2 || _tc_use_if_iuse hardened ) \
+		   && ! use vanilla ; then
+		make_gcc_hard
+	fi
+
+	# make sure the pkg config files install into multilib dirs.
+	# since we configure with just one --libdir, we can't use that
+	# (as gcc itself takes care of building multilibs).  #435728
+	find "${S}" -name Makefile.in \
+		-exec sed -i '/^pkgconfigdir/s:=.*:=$(toolexeclibdir)/pkgconfig:' {} +
+
+	setup_multilib_osdirnames
+	gcc_version_patch
+
+	local actual_version=$(< "${S}"/gcc/BASE-VER)
+	if [[ "${GCC_RELEASE_VER}" != "${actual_version}" ]] ; then
+		eerror "'${S}/gcc/BASE-VER' contains '${actual_version}', expected '${GCC_RELEASE_VER}'"
+		die "Please set 'TOOLCHAIN_GCC_PV' to '${actual_version}'"
+	fi
+
+	# >= gcc-4.3 doesn't bundle ecj.jar, so copy it
+	if tc_version_is_at_least 4.3 && _tc_use_if_iuse gcj ; then
+		if tc_version_is_at_least 4.5 ; then
+			einfo "Copying ecj-4.5.jar"
+			cp -pPR "${DISTDIR}/ecj-4.5.jar" "${S}/ecj.jar" || die
+		else
+			einfo "Copying ecj-4.3.jar"
+			cp -pPR "${DISTDIR}/ecj-4.3.jar" "${S}/ecj.jar" || die
+		fi
+	fi
+
+	# Prevent libffi from being installed
+	if tc_version_is_between 3.0 4.8 ; then
+		sed -i -e 's/\(install.*:\) install-.*recursive/\1/' "${S}"/libffi/Makefile.in || die
+		sed -i -e 's/\(install-data-am:\).*/\1/' "${S}"/libffi/include/Makefile.in || die
+	fi
+
+	# Fixup libtool to correctly generate .la files with portage
+	elibtoolize --portage --shallow --no-uclibc
+
+	gnuconfig_update
+
+	# update configure files
+	local f
+	einfo "Fixing misc issues in configure files"
+	for f in $(grep -l 'autoconf version 2.13' $(find "${S}" -name configure)) ; do
+		ebegin "  Updating ${f/${S}\/} [LANG]"
+		patch "${f}" "${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
+
+	# Prevent new texinfo from breaking old versions (see #198182, #464008)
+	tc_apply_patches "Remove texinfo (bug #198182, bug #464008)" "${FILESDIR}"/gcc-configure-texinfo.patch
+
+	# >=gcc-4
+	if [[ -x contrib/gcc_update ]] ; then
+		einfo "Touching generated files"
+		./contrib/gcc_update --touch | \
+			while read f ; do
+				einfo "  ${f%%...}"
+			done
+	fi
+}
+
+do_gcc_gentoo_patches() {
+	if ! use vanilla ; then
+		if [[ -n ${PATCH_VER} ]] ; then
+			tc_apply_patches "Applying Gentoo patches ..." "${WORKDIR}"/patch/*.patch
+			BRANDING_GCC_PKGVERSION="${BRANDING_GCC_PKGVERSION} p${PATCH_VER}"
+		fi
+
+		if [[ -n ${UCLIBC_VER} ]] ; then
+			tc_apply_patches "Applying uClibc patches ..." "${WORKDIR}"/uclibc/*.patch
+		fi
+
+		if [[ -n ${MUSL_VER} ]] ; then #&& [[ ${CTARGET} == *musl* ]] ; then
+			if [[ ${CATEGORY} == cross-* ]] ; then
+				# We don't want to apply some patches when cross-compiling.
+				if [[ -d "${WORKDIR}"/musl/nocross ]] ; then
+					rm -fv "${WORKDIR}"/musl/nocross/*.patch || die
+				fi
+			fi
+
+			tc_apply_patches "Applying musl patches ..." "${WORKDIR}"/musl/{,nocross/}*.patch
+		fi
+	fi
+}
+
+do_gcc_PIE_patches() {
+	want_pie || return 0
+	use vanilla && return 0
+
+	tc_apply_patches "Applying pie patches ..." "${WORKDIR}"/piepatch/*.patch
+
+	BRANDING_GCC_PKGVERSION="${BRANDING_GCC_PKGVERSION}, pie-${PIE_VER}"
+}
+
+do_gcc_CYGWINPORTS_patches() {
+	[[ -n ${CYGWINPORTS_GITREV} ]] || return 0
+	use elibc_Cygwin || return 0
+
+	local p d="${WORKDIR}/gcc-${CYGWINPORTS_GITREV}"
+	# readarray -t is available since bash-4.4 only, #690686
+	local patches=( $(
+		for p in $(
+			sed -e '1,/PATCH_URI="/d;/"/,$d' < "${d}"/gcc.cygport
+		); do
+			echo "${d}/${p}"
+		done
+	) )
+	tc_apply_patches "Applying cygwin port patches ..." ${patches[*]}
+}
+
+# configure to build with the hardened GCC specs as the default
+make_gcc_hard() {
+	local gcc_hard_flags=""
+
+	# If we use gcc-6 or newer with pie enable to compile older gcc we need to pass -no-pie
+	# to stage1; bug #618908
+	if ! tc_version_is_at_least 6.0 && [[ $(gcc-major-version) -ge 6 ]] ; then
+		einfo "Disabling PIE in stage1 (only) ..."
+		sed -i -e "/^STAGE1_LDFLAGS/ s/$/ -no-pie/" "${S}"/Makefile.in || die
+	fi
+
+	# Gcc >= 6.X we can use configurations options to turn pie/ssp on as default
+	if tc_version_is_at_least 6.0 ; then
+		if _tc_use_if_iuse pie ; then
+			einfo "Updating gcc to use automatic PIE building ..."
+		fi
+		if _tc_use_if_iuse ssp ; then
+			einfo "Updating gcc to use automatic SSP building ..."
+		fi
+		if _tc_use_if_iuse hardened ; then
+			# Will add some hardened options as default, like:
+			# -fstack-clash-protection
+			# -z now
+			# see *_all_extra-options.patch gcc patches.
+			gcc_hard_flags+=" -DEXTRA_OPTIONS"
+			# rebrand to make bug reports easier
+			BRANDING_GCC_PKGVERSION=${BRANDING_GCC_PKGVERSION/Gentoo/Gentoo Hardened}
+		fi
+	else
+		if _tc_use_if_iuse hardened ; then
+			# rebrand to make bug reports easier
+			BRANDING_GCC_PKGVERSION=${BRANDING_GCC_PKGVERSION/Gentoo/Gentoo Hardened}
+			if hardened_gcc_works ; then
+				einfo "Updating gcc to use automatic PIE + SSP building ..."
+				gcc_hard_flags+=" -DEFAULT_PIE_SSP"
+			elif hardened_gcc_works pie ; then
+				einfo "Updating gcc to use automatic PIE building ..."
+				ewarn "SSP has not been enabled by default"
+				gcc_hard_flags+=" -DEFAULT_PIE"
+			elif hardened_gcc_works ssp ; then
+				einfo "Updating gcc to use automatic SSP building ..."
+				ewarn "PIE has not been enabled by default"
+				gcc_hard_flags+=" -DEFAULT_SSP"
+			else
+				# do nothing if hardened isn't supported, but don't die either
+				ewarn "hardened is not supported for this arch in this gcc version"
+				return 0
+			fi
+		else
+			if hardened_gcc_works ssp ; then
+				einfo "Updating gcc to use automatic SSP building ..."
+				gcc_hard_flags+=" -DEFAULT_SSP"
+			fi
+		fi
+	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
+	# Need to add HARD_CFLAGS to ALL_CXXFLAGS on >= 4.7
+	if tc_version_is_at_least 4.7 ; then
+		sed -e '/^ALL_CXXFLAGS/iHARD_CFLAGS = ' \
+			-e 's|^ALL_CXXFLAGS = |ALL_CXXFLAGS = $(HARD_CFLAGS) |' \
+			-i "${S}"/gcc/Makefile.in
+	fi
+
+	sed -i \
+		-e "/^HARD_CFLAGS = /s|=|= ${gcc_hard_flags} |" \
+		"${S}"/gcc/Makefile.in || die
+
+}
+
+# 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 ${CTARGET} in
+	x86_64*-linux*)    config="i386" ;;
+	powerpc64*-linux*) config="rs6000" ;;
+	sparc64*-linux*)   config="sparc" ;;
+	s390x*-linux*)     config="s390" ;;
+	*)	               return 0 ;;
+	esac
+	config+="/t-linux64"
+
+	local sed_args=()
+	if tc_version_is_at_least 4.6 ; then
+		sed_args+=( -e 's:$[(]call if_multiarch[^)]*[)]::g' )
+	fi
+	if [[ ${SYMLINK_LIB} == "yes" ]] ; then
+		einfo "updating multilib directories to be: ${libdirs}"
+		if tc_version_is_at_least 4.6.4 || tc_version_is_at_least 4.7 ; then
+			sed_args+=( -e '/^MULTILIB_OSDIRNAMES.*lib32/s:[$][(]if.*):../lib32:' )
+		else
+			sed_args+=( -e "/^MULTILIB_OSDIRNAMES/s:=.*:= ${libdirs}:" )
+		fi
+	else
+		einfo "using upstream multilib; disabling lib32 autodetection"
+		sed_args+=( -r -e 's:[$][(]if.*,(.*)[)]:\1:' )
+	fi
+	sed -i "${sed_args[@]}" "${S}"/gcc/config/${config} || die
+}
+
+gcc_version_patch() {
+	# gcc-4.3+ has configure flags (whoo!)
+	tc_version_is_at_least 4.3 && return 0
+
+	local version_string=${GCC_RELEASE_VER}
+
+	einfo "patching gcc version: ${version_string} (${BRANDING_GCC_PKGVERSION})"
+
+	local gcc_sed=( -e 's:gcc\.gnu\.org/bugs\.html:bugs\.gentoo\.org/:' )
+	if grep -qs VERSUFFIX "${S}"/gcc/version.c ; then
+		gcc_sed+=( -e "/VERSUFFIX \"\"/s:\"\":\" (${BRANDING_GCC_PKGVERSION})\":" )
+	else
+		version_string="${version_string} (${BRANDING_GCC_PKGVERSION})"
+		gcc_sed+=( -e "/const char version_string\[\] = /s:= \".*\":= \"${version_string}\":" )
+	fi
+	sed -i "${gcc_sed[@]}" "${S}"/gcc/version.c || die
+}
+
+#---->> src_configure <<----
+
+toolchain_src_configure() {
+	downgrade_arch_flags
+	gcc_do_filter_flags
+
+	einfo "CFLAGS=\"${CFLAGS}\""
+	einfo "CXXFLAGS=\"${CXXFLAGS}\""
+	einfo "LDFLAGS=\"${LDFLAGS}\""
+
+	# 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
+
+	local 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} )
+
+	confgcc+=(
+		--prefix="${PREFIX}"
+		--bindir="${BINPATH}"
+		--includedir="${INCLUDEPATH}"
+		--datadir="${DATAPATH}"
+		--mandir="${DATAPATH}/man"
+		--infodir="${DATAPATH}/info"
+		--with-gxx-include-dir="${STDCXX_INCDIR}"
+	)
+
+	# Stick the python scripts in their own slotted directory (bug #279252)
+	#
+	#  --with-python-dir=DIR
+	#  Specifies where to install the Python modules used for aot-compile. DIR
+	#  should not include the prefix used in installation. For example, if the
+	#  Python modules are to be installed in /usr/lib/python2.5/site-packages,
+	#  then --with-python-dir=/lib/python2.5/site-packages should be passed.
+	#
+	# This should translate into "/share/gcc-data/${CTARGET}/${GCC_CONFIG_VER}/python"
+	if tc_version_is_at_least 4.4 ; then
+		confgcc+=( --with-python-dir=${DATAPATH/$PREFIX/}/python )
+	fi
+
+	### language options
+
+	local GCC_LANG="c"
+	is_cxx && GCC_LANG+=",c++"
+	is_d   && GCC_LANG+=",d"
+	is_gcj && GCC_LANG+=",java"
+	is_go  && GCC_LANG+=",go"
+	is_jit && GCC_LANG+=",jit"
+	if is_objc || is_objcxx ; then
+		GCC_LANG+=",objc"
+		use objc-gc && confgcc+=( --enable-objc-gc )
+		is_objcxx && GCC_LANG+=",obj-c++"
+	fi
+
+	# fortran support just got sillier! the lang value can be f77 for
+	# fortran77, f95 for fortran95, or just plain old fortran for the
+	# currently supported standard depending on gcc version.
+	is_fortran && GCC_LANG+=",fortran"
+	is_f77 && GCC_LANG+=",f77"
+	is_f95 && GCC_LANG+=",f95"
+
+	is_ada && GCC_LANG+=",ada"
+
+	confgcc+=( --enable-languages=${GCC_LANG} )
+
+	### general options
+
+	confgcc+=(
+		--enable-obsolete
+		--enable-secureplt
+		--disable-werror
+		--with-system-zlib
+	)
+
+	if use nls ; then
+		confgcc+=( --enable-nls --without-included-gettext )
+	else
+		confgcc+=( --disable-nls )
+	fi
+
+	confgcc+=( --disable-libunwind-exceptions )
+
+	# Use the default ("release") checking because upstream usually neglects
+	# to test "disabled" so it has a history of breaking. bug #317217
+	if in_iuse debug ; then
+		# The "release" keyword is new to 4.0. bug #551636
+		local off=$(tc_version_is_at_least 4.0 && echo release || echo no)
+		confgcc+=( --enable-checking="${GCC_CHECKS_LIST:-$(usex debug yes ${off})}" )
+	fi
+
+	# Branding
+	tc_version_is_at_least 4.3 && confgcc+=(
+		--with-bugurl=https://bugs.gentoo.org/
+		--with-pkgversion="${BRANDING_GCC_PKGVERSION}"
+	)
+
+	# If we want hardened support with the newer piepatchset for >=gcc 4.4
+	if tc_version_is_at_least 4.4 && want_minispecs && in_iuse hardened ; then
+		confgcc+=( $(use_enable hardened esp) )
+	fi
+
+	# allow gcc to search for clock funcs in the main C lib.
+	# if it can't find them, then tough cookies -- we aren't
+	# going to link in -lrt to all C++ apps. bug #411681
+	if tc_version_is_at_least 4.4 && is_cxx ; then
+		confgcc+=( --enable-libstdcxx-time )
+	fi
+
+	# Build compiler itself using LTO
+	if tc_version_is_at_least 9.1 && _tc_use_if_iuse lto ; then
+		confgcc+=( --with-build-config=bootstrap-lto )
+	fi
+
+	# Support to disable pch when building libstdcxx
+	if tc_version_is_at_least 6.0 && ! _tc_use_if_iuse pch ; then
+		confgcc+=( --disable-libstdcxx-pch )
+	fi
+
+	# The jit language requires this.
+	is_jit && confgcc+=( --enable-host-shared )
+
+	# build-id was disabled for file collisions: bug #526144
+	#
+	# # Turn on the -Wl,--build-id flag by default for ELF targets. bug #525942
+	# # This helps with locating debug files.
+	# case ${CTARGET} in
+	# *-linux-*|*-elf|*-eabi)
+	# 	tc_version_is_at_least 4.5 && confgcc+=(
+	# 		--enable-linker-build-id
+	# 	)
+	# 	;;
+	# esac
+
+	# newer gcc versions like to bootstrap themselves with C++,
+	# so we need to manually disable it ourselves
+	if tc_version_is_between 4.7 4.8 && ! is_cxx ; then
+		confgcc+=( --disable-build-with-cxx --disable-build-poststage1-with-cxx )
+	fi
+
+	### Cross-compiler options
+	if is_crosscompile ; then
+		# Enable build warnings by default with cross-compilers when system
+		# paths are included (e.g. via -I flags).
+		confgcc+=( --enable-poison-system-directories )
+
+		# 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=error-unknown-libc;;
+		*-dietlibc)		 needed_libc=dietlibc;;
+		*-elf|*-eabi)
+			needed_libc=newlib
+			# Bare-metal targets don't have access to clock_gettime()
+			# arm-none-eabi example: bug #589672
+			# But we explicitly do --enable-libstdcxx-time above.
+			# Undoing it here.
+			confgcc+=( --disable-libstdcxx-time )
+			;;
+		*-freebsd*)		 needed_libc=freebsd-lib;;
+		*-gnu*)			 needed_libc=glibc;;
+		*-klibc)		 needed_libc=klibc;;
+		*-musl*)		 needed_libc=musl;;
+		*-uclibc*)
+			# Enable shared library support only on targets
+			# that support it: bug #291870
+			if ! echo '#include <features.h>' | \
+			   $(tc-getCPP ${CTARGET}) -E -dD - 2>/dev/null | \
+			   grep -q __HAVE_SHARED__
+			then
+				confgcc+=( --disable-shared )
+			fi
+			needed_libc=uclibc-ng
+			;;
+		*-cygwin)		 needed_libc=cygwin;;
+		x86_64-*-mingw*|\
+		*-w64-mingw*)	 needed_libc=mingw64-runtime;;
+		avr)			 confgcc+=( --enable-shared --disable-threads );;
+		esac
+		if [[ -n ${needed_libc} ]] ; then
+			local confgcc_no_libc=( --disable-shared )
+			# requires libc: bug #734820
+			tc_version_is_at_least 4.6 && confgcc_no_libc+=( --disable-libquadmath )
+			# requires libc
+			tc_version_is_at_least 4.8 && confgcc_no_libc+=( --disable-libatomic )
+			if ! has_version ${CATEGORY}/${needed_libc} ; then
+				confgcc+=(
+					"${confgcc_no_libc[@]}"
+					--disable-threads
+					--without-headers
+				)
+				if [[ $needed_libc == glibc ]]; then
+					# By default gcc looks at glibc's headers
+					# to detect long double support. This does
+					# not work for --disable-headers mode.
+					# Any >=glibc-2.4 is good enough for float128.
+					# The option appeared in gcc-4.2.
+					confgcc+=( --with-long-double-128 )
+				fi
+			elif has_version "${CATEGORY}/${needed_libc}[headers-only(-)]" ; then
+				confgcc+=(
+					"${confgcc_no_libc[@]}"
+					--with-sysroot="${PREFIX}"/${CTARGET}
+				)
+			else
+				confgcc+=( --with-sysroot="${PREFIX}"/${CTARGET} )
+			fi
+		fi
+
+		confgcc+=( --disable-bootstrap )
+	else
+		if tc-is-static-only ; then
+			confgcc+=( --disable-shared )
+		else
+			confgcc+=( --enable-shared )
+		fi
+		case ${CHOST} in
+		mingw*|*-mingw*)
+			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*)
+		if tc_has_feature nptl ; then
+			confgcc+=(
+				--disable-__cxa_atexit
+				$(use_enable nptl tls)
+			)
+		fi
+		;;
+	*-elf|*-eabi)
+		confgcc+=( --with-newlib )
+		;;
+	*-musl*)
+		confgcc+=( --enable-__cxa_atexit )
+		;;
+	*-gnu*)
+		confgcc+=(
+			--enable-__cxa_atexit
+			--enable-clocale=gnu
+		)
+		;;
+	*-freebsd*)
+		confgcc+=( --enable-__cxa_atexit )
+		;;
+	*-solaris*)
+		confgcc+=( --enable-__cxa_atexit )
+		;;
+	esac
+
+	### arch options
+
+	gcc-multilib-configure
+
+	# 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 && in_iuse fixed-point && confgcc+=( $(use_enable fixed-point) )
+
+	case $(tc-is-softfloat) in
+	yes)    confgcc+=( --with-float=soft ) ;;
+	softfp) confgcc+=( --with-float=softfp ) ;;
+	*)
+		# If they've explicitly opt-ed in, do hardfloat,
+		# otherwise let the gcc default kick in.
+		case ${CTARGET//_/-} in
+		*-hardfloat-*|*eabihf) confgcc+=( --with-float=hard ) ;;
+		esac
+	esac
+
+	local with_abi_map=()
+	case $(tc-arch) in
+	arm)	#264534 #414395
+		local a arm_arch=${CTARGET%%-*}
+		# Remove trailing endian variations first: eb el be bl b l
+		for a in e{b,l} {b,l}e b l ; do
+			if [[ ${arm_arch} == *${a} ]] ; then
+				arm_arch=${arm_arch%${a}}
+				break
+			fi
+		done
+		# Convert armv7{a,r,m} to armv7-{a,r,m}
+		[[ ${arm_arch} == armv7? ]] && arm_arch=${arm_arch/7/7-}
+		# See if this is a valid --with-arch flag
+		if (srcdir=${S}/gcc target=${CTARGET} with_arch=${arm_arch};
+		    . "${srcdir}"/config.gcc) &>/dev/null
+		then
+			confgcc+=( --with-arch=${arm_arch} )
+		fi
+
+		# Make default mode thumb for microcontroller classes #418209
+		[[ ${arm_arch} == *-m ]] && confgcc+=( --with-mode=thumb )
+
+		# Enable hardvfp
+		if [[ $(tc-is-softfloat) == "no" ]] && \
+		   [[ ${CTARGET} == armv[67]* ]] && \
+		   tc_version_is_at_least 4.5
+		then
+			# Follow the new arm hardfp distro standard by default
+			confgcc+=( --with-float=hard )
+			case ${CTARGET} in
+			armv6*) confgcc+=( --with-fpu=vfp ) ;;
+			armv7*) confgcc+=( --with-fpu=vfpv3-d16 ) ;;
+			esac
+		fi
+		;;
+	mips)
+		# Add --with-abi flags to set default ABI
+		confgcc+=( --with-abi=$(gcc-abi-map ${TARGET_DEFAULT_ABI}) )
+		;;
+	amd64)
+		# drop the older/ABI checks once this get's merged into some
+		# version of gcc upstream
+		if tc_version_is_at_least 4.8 && has x32 $(get_all_abis TARGET) ; then
+			confgcc+=( --with-abi=$(gcc-abi-map ${TARGET_DEFAULT_ABI}) )
+		fi
+		;;
+	x86)
+		# Default arch for x86 is normally i386, lets give it a bump
+		# since glibc will do so based on CTARGET anyways
+		confgcc+=( --with-arch=${CTARGET%%-*} )
+		;;
+	hppa)
+		# Enable sjlj exceptions for backward compatibility on hppa
+		[[ ${GCCMAJOR} == "3" ]] && confgcc+=( --enable-sjlj-exceptions )
+		;;
+	ppc)
+		# Set up defaults based on current CFLAGS
+		is-flagq -mfloat-gprs=double && confgcc+=( --enable-e500-double )
+		[[ ${CTARGET//_/-} == *-e500v2-* ]] && confgcc+=( --enable-e500-double )
+		;;
+	ppc64)
+		# On ppc64 big endian target gcc assumes elfv1 by default,
+		# and elfv2 on little endian
+		# but musl does not support elfv1 at all on any endian ppc64
+		# see https://git.musl-libc.org/cgit/musl/tree/INSTALL
+		# https://bugs.gentoo.org/704784
+		# https://gcc.gnu.org/PR93157
+		[[ ${CTARGET} == powerpc64-*-musl ]] && confgcc+=( --with-abi=elfv2 )
+		;;
+	riscv)
+		# Add --with-abi flags to set default ABI
+		confgcc+=( --with-abi=$(gcc-abi-map ${TARGET_DEFAULT_ABI}) )
+		;;
+	esac
+
+	# if the target can do biarch (-m32/-m64), enable it.  overhead should
+	# be small, and should simplify building of 64bit kernels in a 32bit
+	# userland by not needing sys-devel/kgcc64.  #349405
+	case $(tc-arch) in
+	ppc|ppc64) confgcc+=( --enable-targets=all ) ;;
+	sparc)     tc_version_is_at_least 4.4 && confgcc+=( --enable-targets=all ) ;;
+	amd64|x86) tc_version_is_at_least 4.3 && confgcc+=( --enable-targets=all ) ;;
+	esac
+
+	# 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 )
+
+	### library options
+
+	if tc_version_is_between 3.0 7.0 ; then
+		if is_gcj ; then
+			confgcc+=( --disable-gjdoc )
+			use awt && confgcc+=( --enable-java-awt=gtk )
+		else
+			confgcc+=( --disable-libgcj )
+		fi
+	fi
+
+	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
+
+	if _tc_use_if_iuse libssp ; then
+		confgcc+=( --enable-libssp )
+	else
+		if hardened_gcc_is_stable ssp; then
+			export gcc_cv_libc_provides_ssp=yes
+		fi
+		if _tc_use_if_iuse ssp; then
+			# On some targets USE="ssp -libssp" is an invalid
+			# configuration as target libc does not provide
+			# stack_chk_* functions. Do not disable libssp there.
+			case ${CTARGET} in
+				mingw*|*-mingw*) ewarn "Not disabling libssp" ;;
+				*) confgcc+=( --disable-libssp ) ;;
+			esac
+		else
+			confgcc+=( --disable-libssp )
+		fi
+	fi
+
+	if in_iuse ada ; then
+		confgcc+=( --disable-libada )
+	fi
+
+	if in_iuse cilk ; then
+		confgcc+=( $(use_enable cilk libcilkrts) )
+	fi
+
+	if in_iuse mpx ; then
+		confgcc+=( $(use_enable mpx libmpx) )
+	fi
+
+	if in_iuse systemtap ; then
+		confgcc+=( $(use_enable systemtap) )
+	fi
+
+	if in_iuse valgrind ; then
+		confgcc+=( $(use_enable valgrind valgrind-annotations) )
+	fi
+
+	if in_iuse vtv ; then
+		confgcc+=(
+			$(use_enable vtv vtable-verify)
+			# See Note [implicitly enabled flags]
+			$(usex vtv '' --disable-libvtv)
+		)
+	fi
+
+	if in_iuse zstd ; then
+		confgcc+=( $(use_with zstd) )
+	fi
+
+	if tc_version_is_at_least 4.6 ; then
+		confgcc+=( --enable-lto )
+	elif tc_version_is_at_least 4.5 ; then
+		confgcc+=( --disable-lto )
+	fi
+
+	# graphite was added in 4.4 but we only support it in 6.5+ due to external
+	# library issues.  #448024, #701270
+	if tc_version_is_at_least 6.5 && in_iuse graphite ; then
+		confgcc+=( $(use_with graphite isl) )
+		use graphite && confgcc+=( --disable-isl-version-check )
+	elif tc_version_is_at_least 5.0 ; then
+		confgcc+=( --without-isl )
+	elif tc_version_is_at_least 4.8 ; then
+		confgcc+=( --without-cloog )
+	elif tc_version_is_at_least 4.4 ; then
+		confgcc+=( --without-{cloog,ppl} )
+	fi
+
+	if tc_version_is_at_least 4.8; then
+		if in_iuse sanitize ; then
+			# See Note [implicitly enabled flags]
+			confgcc+=( $(usex sanitize '' --disable-libsanitizer) )
+		else
+			confgcc+=( --disable-libsanitizer )
+		fi
+	fi
+
+	if tc_version_is_at_least 6.0 && in_iuse pie ; then
+		confgcc+=( $(use_enable pie default-pie) )
+	fi
+
+	if tc_version_is_at_least 6.0 && in_iuse ssp ; then
+		confgcc+=(
+			# This defaults to -fstack-protector-strong.
+			$(use_enable ssp default-ssp)
+		)
+	fi
+
+	# Disable gcc info regeneration -- it ships with generated info pages
+	# already.  Our custom version/urls/etc... trigger it.  #464008
+	export gcc_cv_prog_makeinfo_modern=no
+
+	# Do not let the X detection get in our way.  We know things can be found
+	# via system paths, so no need to hardcode things that'll break multilib.
+	# Older gcc versions will detect ac_x_libraries=/usr/lib64 which ends up
+	# killing the 32bit builds which want /usr/lib.
+	export ac_cv_have_x='have_x=yes ac_x_includes= ac_x_libraries='
+
+	confgcc+=( "$@" ${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 "Languages:       ${GCC_LANG}"
+	echo
+	einfo "Configuring GCC with: ${confgcc[@]//--/\n\t--}"
+	echo
+
+	# Build in a separate build tree
+	mkdir -p "${WORKDIR}"/build
+	pushd "${WORKDIR}"/build > /dev/null
+
+	# and now to do the actual configuration
+	addwrite /dev/zero
+	echo "${S}"/configure "${confgcc[@]}"
+	# Older gcc versions did not detect bash and re-exec itself, so force the
+	# use of bash.  Newer ones will auto-detect, but this is not harmful.
+	CONFIG_SHELL="${EPREFIX}/bin/bash" \
+	bash "${S}"/configure "${confgcc[@]}" || die "failed to run configure"
+
+	# return to whatever directory we were in before
+	popd > /dev/null
+}
+
+# Replace -m flags unsupported by the version being built with the best
+# available equivalent
+downgrade_arch_flags() {
+	local arch bver i isa myarch mytune rep ver
+
+	bver=${1:-${GCC_BRANCH_VER}}
+	# Don't perform downgrade if running gcc is older than ebuild's.
+	tc_version_is_at_least ${bver} $(gcc-version) || return 0
+	[[ $(tc-arch) != amd64 && $(tc-arch) != x86 ]] && return 0
+
+	myarch=$(get-flag march)
+	mytune=$(get-flag mtune)
+
+	# Handle special -mtune flags
+	[[ ${mytune} == intel ]] && ! tc_version_is_at_least 4.9 ${bver} && replace-cpu-flags intel generic
+	[[ ${mytune} == x86-64 ]] && filter-flags '-mtune=*'
+
+	# "added" "arch" "replacement"
+	local archlist=(
+		10 znver3 znver2
+		9 znver2 znver1
+		4.9 bdver4 bdver3
+		4.9 bonnell atom
+		4.9 broadwell core-avx2
+		4.9 haswell core-avx2
+		4.9 ivybridge core-avx-i
+		4.9 nehalem corei7
+		4.9 sandybridge corei7-avx
+		4.9 silvermont corei7
+		4.9 westmere corei7
+		4.8 bdver3 bdver2
+		4.8 btver2 btver1
+		4.7 bdver2 bdver1
+		4.7 core-avx2 core-avx-i
+		4.6 bdver1 amdfam10
+		4.6 btver1 amdfam10
+		4.6 core-avx-i core2
+		4.6 corei7 core2
+		4.6 corei7-avx core2
+		4.5 atom core2
+		4.3 amdfam10 k8
+		4.3 athlon64-sse3 k8
+		4.3 barcelona k8
+		4.3 core2 nocona
+		4.3 geode k6-2 # gcc.gnu.org/PR41989#c22
+		4.3 k8-sse3 k8
+		4.3 opteron-sse3 k8
+	)
+
+	for ((i = 0; i < ${#archlist[@]}; i += 3)) ; do
+		myarch=$(get-flag march)
+		mytune=$(get-flag mtune)
+
+		ver=${archlist[i]}
+		arch=${archlist[i + 1]}
+		rep=${archlist[i + 2]}
+
+		[[ ${myarch} != ${arch} && ${mytune} != ${arch} ]] && continue
+
+		if ! tc_version_is_at_least ${ver} ${bver}; then
+			einfo "Downgrading '${myarch}' (added in gcc ${ver}) with '${rep}'..."
+			[[ ${myarch} == ${arch} ]] && replace-cpu-flags ${myarch} ${rep}
+			[[ ${mytune} == ${arch} ]] && replace-cpu-flags ${mytune} ${rep}
+			continue
+		else
+			break
+		fi
+	done
+
+	# we only check -mno* here since -m* get removed by strip-flags later on
+	local isalist=(
+		4.9 -mno-sha
+		4.9 -mno-avx512pf
+		4.9 -mno-avx512f
+		4.9 -mno-avx512er
+		4.9 -mno-avx512cd
+		4.8 -mno-xsaveopt
+		4.8 -mno-xsave
+		4.8 -mno-rtm
+		4.8 -mno-fxsr
+		4.7 -mno-lzcnt
+		4.7 -mno-bmi2
+		4.7 -mno-avx2
+		4.6 -mno-tbm
+		4.6 -mno-rdrnd
+		4.6 -mno-fsgsbase
+		4.6 -mno-f16c
+		4.6 -mno-bmi
+		4.5 -mno-xop
+		4.5 -mno-movbe
+		4.5 -mno-lwp
+		4.5 -mno-fma4
+		4.4 -mno-pclmul
+		4.4 -mno-fma
+		4.4 -mno-avx
+		4.4 -mno-aes
+		4.3 -mno-ssse3
+		4.3 -mno-sse4a
+		4.3 -mno-sse4
+		4.3 -mno-sse4.2
+		4.3 -mno-sse4.1
+		4.3 -mno-popcnt
+		4.3 -mno-abm
+	)
+
+	for ((i = 0; i < ${#isalist[@]}; i += 2)) ; do
+		ver=${isalist[i]}
+		isa=${isalist[i + 1]}
+		tc_version_is_at_least ${ver} ${bver} || filter-flags ${isa} ${isa/-m/-mno-}
+	done
+}
+
+gcc_do_filter_flags() {
+	# Allow users to explicitly avoid flag sanitization via
+	# USE=custom-cflags.
+	if ! _tc_use_if_iuse custom-cflags; then
+		# Over-zealous CFLAGS can often cause problems.  What may work for one
+		# person may not work for another.  To avoid a large influx of bugs
+		# relating to failed builds, we strip most CFLAGS out to ensure as few
+		# problems as possible.
+		strip-flags
+		# Lock gcc at -O2; we want to be conservative here.
+		filter-flags '-O?'
+		append-flags -O2
+	fi
+
+	# dont want to funk ourselves
+	filter-flags '-mabi*' -m31 -m32 -m64
+
+	filter-flags -frecord-gcc-switches # 490738
+	filter-flags -mno-rtm -mno-htm # 506202
+
+	if tc_version_is_between 6 8 ; then
+		# -mstackrealign triggers crashes in exception throwing
+		# at least on ada: bug #688580
+		# The reason is unknown. Drop the flag for now.
+		filter-flags -mstackrealign
+	fi
+
+	case $(tc-arch) in
+		amd64|x86)
+			filter-flags '-mcpu=*'
+
+			tc_version_is_between 4.4 4.5 && append-flags -mno-avx # 357287
+
+			if tc_version_is_between 4.6 4.7 ; then
+				# https://bugs.gentoo.org/411333
+				# https://bugs.gentoo.org/466454
+				replace-cpu-flags c3-2 pentium2 pentium3 pentium3m pentium-m i686
+			fi
+			;;
+		alpha)
+			# https://bugs.gentoo.org/454426
+			append-ldflags -Wl,--no-relax
+			;;
+		sparc)
+			# temporary workaround for random ICEs reproduced by multiple users
+			# https://bugs.gentoo.org/457062
+			tc_version_is_between 4.6 4.8 && MAKEOPTS+=" -j1"
+			;;
+		*-macos)
+			# http://gcc.gnu.org/PR25127
+			tc_version_is_between 4.0 4.2 && \
+				filter-flags '-mcpu=*' '-march=*' '-mtune=*'
+			;;
+	esac
+
+	strip-unsupported-flags
+
+	# these are set here so we have something sane at configure time
+	if is_crosscompile ; then
+		# Set this to something sane for both native and target
+		CFLAGS="-O2 -pipe"
+		FFLAGS=${CFLAGS}
+		FCFLAGS=${CFLAGS}
+
+		# "hppa2.0-unknown-linux-gnu" -> hppa2_0_unknown_linux_gnu
+		local VAR="CFLAGS_"${CTARGET//[-.]/_}
+		CXXFLAGS=${!VAR-${CFLAGS}}
+	fi
+
+	export GCJFLAGS=${GCJFLAGS:-${CFLAGS}}
+}
+
+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
+}
+
+gcc-multilib-configure() {
+	if ! is_multilib ; then
+		confgcc+=( --disable-multilib )
+		# Fun times: if we are building for a target that has multiple
+		# possible ABI formats, and the user has told us to pick one
+		# that isn't the default, then not specifying it via the list
+		# below will break that on us.
+	else
+		confgcc+=( --enable-multilib )
+	fi
+
+	# translate our notion of multilibs into gcc's
+	local abi list
+	for abi in $(get_all_abis TARGET) ; do
+		local l=$(gcc-abi-map ${abi})
+		[[ -n ${l} ]] && list+=",${l}"
+	done
+	if [[ -n ${list} ]] ; then
+		case ${CTARGET} in
+		x86_64*)
+			tc_version_is_at_least 4.8 && confgcc+=( --with-multilib-list=${list:1} )
+			;;
+		esac
+	fi
+}
+
+gcc-abi-map() {
+	# Convert the ABI name we use in Gentoo to what gcc uses
+	local map=()
+	case ${CTARGET} in
+	mips*)   map=("o32 32" "n32 n32" "n64 64") ;;
+	riscv*)  map=("lp64d lp64d" "lp64 lp64" "ilp32d ilp32d" "ilp32 ilp32") ;;
+	x86_64*) map=("amd64 m64" "x86 m32" "x32 mx32") ;;
+	esac
+
+	local m
+	for m in "${map[@]}" ; do
+		l=( ${m} )
+		[[ $1 == ${l[0]} ]] && echo ${l[1]} && break
+	done
+}
+
+#----> src_compile <----
+
+toolchain_src_compile() {
+	touch "${S}"/gcc/c-gperf.h
+
+	# Do not make manpages if we do not have perl ...
+	[[ ! -x /usr/bin/perl ]] \
+		&& find "${WORKDIR}"/build -name '*.[17]' -exec touch {} +
+
+	# To compile ada library standard files special compiler options are passed
+	# via ADAFLAGS in the Makefile.
+	# Unset ADAFLAGS as setting this override the options
+	unset ADAFLAGS
+
+	# Older gcc versions did not detect bash and re-exec itself, so force the
+	# use of bash.  Newer ones will auto-detect, but this is not harmful.
+	# This needs to be set for compile as well, as it's used in libtool
+	# generation, which will break install otherwise (at least in 3.3.6): #664486
+	CONFIG_SHELL="${EPREFIX}/bin/bash" \
+	gcc_do_make ${GCC_MAKE_TARGET}
+}
+
+gcc_do_make() {
+	# This function accepts one optional argument, the make target to be used.
+	# If omitted, gcc_do_make will try to guess whether it should use all,
+	# or bootstrap-lean depending on CTARGET and arch.
+	# An example of how to use this function:
+	#
+	#	gcc_do_make all-target-libstdc++-v3
+
+	[[ -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=${GCC_MAKE_TARGET-all}
+	else
+		if _tc_use_if_iuse pgo; then
+			GCC_MAKE_TARGET=${GCC_MAKE_TARGET-profiledbootstrap}
+		else
+			GCC_MAKE_TARGET=${GCC_MAKE_TARGET-bootstrap-lean}
+		fi
+	fi
+
+	# Older versions of GCC could not do profiledbootstrap in parallel due to
+	# collisions with profiling info.
+	if [[ ${GCC_MAKE_TARGET} == "profiledbootstrap" ]]; then
+		! tc_version_is_at_least 4.6 && export MAKEOPTS="${MAKEOPTS} -j1"
+	fi
+
+	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 ${TARGET_DEFAULT_ABI}) ${CFLAGS}"}
+	fi
+
+	einfo "Compiling ${PN} (${GCC_MAKE_TARGET})..."
+
+	pushd "${WORKDIR}"/build >/dev/null
+
+	emake \
+		LDFLAGS="${LDFLAGS}" \
+		STAGE1_CFLAGS="${STAGE1_CFLAGS}" \
+		LIBPATH="${LIBPATH}" \
+		BOOT_CFLAGS="${BOOT_CFLAGS}" \
+		${GCC_MAKE_TARGET} \
+		|| die "emake failed with ${GCC_MAKE_TARGET}"
+
+	if is_ada; then
+		# Without these links it is not getting the good compiler
+		# Need to check why
+		ln -s gcc ../build/prev-gcc || die
+		ln -s ${CHOST} ../build/prev-${CHOST} || die
+		# Building standard ada library
+		emake -C gcc gnatlib-shared
+		# Building gnat toold
+		emake -C gcc gnattools
+	fi
+
+	if ! is_crosscompile && _tc_use_if_iuse cxx && _tc_use_if_iuse doc ; then
+		if type -p doxygen > /dev/null ; then
+			if tc_version_is_at_least 4.3 ; then
+				cd "${CTARGET}"/libstdc++-v3/doc
+				emake doc-man-doxygen || ewarn "failed to make docs"
+			else
+				cd "${CTARGET}"/libstdc++-v3
+				emake doxygen-man || ewarn "failed to make docs"
+			fi
+			# Clean bogus manpages.  #113902
+			find -name '*_build_*' -delete
+			# Blow away generated directory references.  Newer versions of gcc
+			# have gotten better at this, but not perfect.  This is easier than
+			# backporting all of the various doxygen patches.  #486754
+			find -name '*_.3' -exec grep -l ' Directory Reference ' {} + | \
+				xargs rm -f
+		else
+			ewarn "Skipping libstdc++ manpage generation since you don't have doxygen installed"
+		fi
+	fi
+
+	popd >/dev/null
+}
+
+#---->> src_test <<----
+
+toolchain_src_test() {
+	cd "${WORKDIR}"/build
+	# 'asan' wants to be preloaded first, so does 'sandbox'.
+	# To make asan tests work disable sandbox for all of test suite.
+	# 'backtrace' tests also does not like 'libsandbox.so' presence.
+	SANDBOX_ON=0 LD_PRELOAD= emake -k check
+}
+
+#---->> src_install <<----
+
+toolchain_src_install() {
+	cd "${WORKDIR}"/build
+
+	# Don't allow symlinks in private gcc include dir as this can break the build
+	find gcc/include*/ -type l -delete
+
+	# Copy over the info pages.  We disabled their generation earlier, but the
+	# build system only expects to install out of the build dir, not the source.  #464008
+	mkdir -p gcc/doc
+	local x=
+	for x in "${S}"/gcc/doc/*.info* ; do
+		if [[ -f ${x} ]] ; then
+			cp "${x}" gcc/doc/ || die
+		fi
+	done
+
+	# We remove the generated fixincludes, as they can cause things to break
+	# (ncurses, openssl, etc).  We do not prevent them from being built, as
+	# in the following commit which we revert:
+	# https://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/eclass/toolchain.eclass?r1=1.647&r2=1.648
+	# This is because bsd userland needs fixedincludes to build gcc, while
+	# linux does not.  Both can dispose of them afterwards.
+	while read x ; do
+		grep -q 'It has been auto-edited by fixincludes from' "${x}" \
+			&& rm -f "${x}"
+	done < <(find gcc/include*/ -name '*.h')
+
+	# 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 "${ED}" -name install-tools -prune -type d -exec rm -rf "{}" \;
+	# This one comes with binutils
+	find "${ED}" -name libiberty.a -delete
+
+	# 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 ${ED}"
+	fi
+
+	dodir /etc/env.d/gcc
+	create_gcc_env_entry
+	create_revdep_rebuild_entry
+
+	# Setup the gcc_env_entry for hardened gcc 4 with minispecs
+	want_minispecs && copy_minispecs_gcc_specs
+
+	# Make sure we dont have stuff lying around that
+	# can nuke multiple versions of gcc
+	gcc_slot_java
+
+	dodir /usr/bin
+	cd "${D}"${BINPATH}
+	# Ugh: we really need to auto-detect this list.
+	#      It's constantly out of date.
+	for x in cpp gcc g++ c++ gcov g77 gcj gcjh gfortran gccgo gnat* ; do
+		# For some reason, g77 gets made instead of ${CTARGET}-g77...
+		# this should take care of that
+		if [[ -f ${x} ]] ; then
+			# In case they're hardlinks, clear out the target first
+			# otherwise the mv below will complain.
+			rm -f ${CTARGET}-${x}
+			mv ${x} ${CTARGET}-${x}
+		fi
+
+		if [[ -f ${CTARGET}-${x} ]] ; then
+			if ! is_crosscompile ; then
+				ln -sf ${CTARGET}-${x} ${x}
+				dosym ${BINPATH}/${CTARGET}-${x} \
+					/usr/bin/${x}-${GCC_CONFIG_VER}
+			fi
+			# Create versioned symlinks
+			dosym ${BINPATH}/${CTARGET}-${x} \
+				/usr/bin/${CTARGET}-${x}-${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
+
+	# When gcc builds a crosscompiler it does not install unprefixed tools.
+	# When cross-building gcc does install native tools.
+	if ! is_crosscompile; then
+		# Rename the main go binaries as we don't want to clobber dev-lang/go
+		# when gcc-config runs. #567806
+		if tc_version_is_at_least 5 && is_go ; then
+			for x in go gofmt; do
+				mv ${x} ${x}-${GCCMAJOR} || die
+			done
+		fi
+	fi
+
+	# As gcc installs object files built against bost ${CHOST} and ${CTARGET}
+	# ideally we will need to strip them using different tools:
+	# Using ${CHOST} tools:
+	#  - "${D}${BINPATH}"
+	#  - (for is_crosscompile) "${D}${HOSTLIBPATH}"
+	#  - "${D}${PREFIX}/libexec/gcc/${CTARGET}/${GCC_CONFIG_VER}"
+	# Using ${CTARGET} tools:
+	#  - "${D}${LIBPATH}"
+	# As dostrip does not specify host to override ${CHOST} tools just skip
+	# non-native binary stripping.
+	is_crosscompile && tc_supports_dostrip && dostrip -x "${LIBPATH}"
+
+	cd "${S}"
+	if is_crosscompile; then
+		rm -rf "${ED}"/usr/share/{man,info}
+		rm -rf "${D}"${DATAPATH}/{man,info}
+	else
+		local cxx_mandir=$(find "${WORKDIR}/build/${CTARGET}/libstdc++-v3" -name man)
+		if [[ -d ${cxx_mandir} ]] ; then
+			cp -r "${cxx_mandir}"/man? "${D}${DATAPATH}"/man/
+		fi
+	fi
+
+	# portage regenerates 'dir' files on it's own: bug #672408
+	# Drop 'dir' files to avoid collisions.
+	if [[ -f "${D}${DATAPATH}"/info/dir ]]; then
+		einfo "Deleting '${D}${DATAPATH}/info/dir'"
+		rm "${D}${DATAPATH}"/info/dir || die
+	fi
+
+	# prune empty dirs left behind
+	find "${ED}" -depth -type d -delete 2>/dev/null
+
+	# libstdc++.la: Delete as it doesn't add anything useful: g++ itself
+	# handles linkage correctly in the dynamic & static case.  It also just
+	# causes us pain: any C++ progs/libs linking with libtool will gain a
+	# reference to the full libstdc++.la file which is gcc version specific.
+	# libstdc++fs.la: It doesn't link against anything useful.
+	# libsupc++.la: This has no dependencies.
+	# libcc1.la: There is no static library, only dynamic.
+	# libcc1plugin.la: Same as above, and it's loaded via dlopen.
+	# libcp1plugin.la: Same as above, and it's loaded via dlopen.
+	# libgomp.la: gcc itself handles linkage (libgomp.spec).
+	# libgomp-plugin-*.la: Same as above, and it's an internal plugin only
+	# loaded via dlopen.
+	# libgfortran.la: gfortran itself handles linkage correctly in the
+	# dynamic & static case (libgfortran.spec). #573302
+	# libgfortranbegin.la: Same as above, and it's an internal lib.
+	# libmpx.la: gcc itself handles linkage correctly (libmpx.spec).
+	# libmpxwrappers.la: See above.
+	# libitm.la: gcc itself handles linkage correctly (libitm.spec).
+	# libvtv.la: gcc itself handles linkage correctly.
+	# lib*san.la: Sanitizer linkage is handled internally by gcc, and they
+	# do not support static linking. #487550 #546700
+	find "${D}${LIBPATH}" \
+		'(' \
+			-name libstdc++.la -o \
+			-name libstdc++fs.la -o \
+			-name libsupc++.la -o \
+			-name libcc1.la -o \
+			-name libcc1plugin.la -o \
+			-name libcp1plugin.la -o \
+			-name 'libgomp.la' -o \
+			-name 'libgomp-plugin-*.la' -o \
+			-name libgfortran.la -o \
+			-name libgfortranbegin.la -o \
+			-name libmpx.la -o \
+			-name libmpxwrappers.la -o \
+			-name libitm.la -o \
+			-name libvtv.la -o \
+			-name 'lib*san.la' \
+		')' -type f -delete
+
+	# Use gid of 0 because some stupid ports don't have
+	# the group 'root' set to gid 0.  Send to /dev/null
+	# for people who are testing as non-root.
+	chown -R root:0 "${D}${LIBPATH}" 2>/dev/null
+
+	# Installing gdb pretty-printers into gdb-specific location.
+	local py gdbdir=/usr/share/gdb/auto-load${LIBPATH}
+	pushd "${D}${LIBPATH}" >/dev/null
+	for py in $(find . -name '*-gdb.py') ; do
+		local multidir=${py%/*}
+		insinto "${gdbdir}/${multidir}"
+		sed -i "/^libdir =/s:=.*:= '${LIBPATH}/${multidir}':" "${py}" || die #348128
+		doins "${py}" || die
+		rm "${py}" || die
+	done
+	popd >/dev/null
+
+	# Don't scan .gox files for executable stacks - false positives
+	export QA_EXECSTACK="usr/lib*/go/*/*.gox"
+	export QA_WX_LOAD="usr/lib*/go/*/*.gox"
+
+	# Disable RANDMMAP so PCH works. #301299
+	if tc_version_is_at_least 4.3 ; then
+		pax-mark -r "${D}${PREFIX}/libexec/gcc/${CTARGET}/${GCC_CONFIG_VER}/cc1"
+		pax-mark -r "${D}${PREFIX}/libexec/gcc/${CTARGET}/${GCC_CONFIG_VER}/cc1plus"
+	fi
+
+	# Disable MPROTECT so java works. #574808
+	if is_gcj ; then
+		pax-mark -m "${D}${PREFIX}/libexec/gcc/${CTARGET}/${GCC_CONFIG_VER}/ecj1"
+		pax-mark -m "${D}${PREFIX}/${CTARGET}/gcc-bin/${GCC_CONFIG_VER}/gij"
+	fi
+}
+
+# Move around the libs to the right location.  For some reason,
+# when installing gcc, it dumps internal libraries into /usr/lib
+# instead of the private gcc lib path
+gcc_movelibs() {
+	# For non-target libs which are for CHOST and not CTARGET, we want to
+	# move them to the compiler-specific CHOST internal dir.  This is stuff
+	# that you want to link against when building tools rather than building
+	# code to run on the target.
+	if tc_version_is_at_least 5 && is_crosscompile ; then
+		dodir "${HOSTLIBPATH#${EPREFIX}}"
+		mv "${ED}"/usr/$(get_libdir)/libcc1* "${D}${HOSTLIBPATH}" || die
+	fi
+	# libgccjit gets installed to /usr/lib, not /usr/$(get_libdir). Probably
+	# due to a bug in gcc build system.
+	if is_jit ; then
+		dodir "${LIBPATH#${EPREFIX}}"
+		mv "${ED}"/usr/lib/libgccjit* "${D}${LIBPATH}" || die
+	fi
+
+	# For all the libs that are built for CTARGET, move them into the
+	# compiler-specific CTARGET internal dir.
+	local x 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}" || die
+				fi
+			fi
+		done
+		fix_libtool_libdir_paths "${LIBPATH}/${MULTIDIR}"
+
+		# SLOT up libgcj.pc if it's available (and let gcc-config worry about links)
+		FROMDIR="${PREFIX}/lib/${OS_MULTIDIR}"
+		for x in "${D}${FROMDIR}"/pkgconfig/libgcj*.pc ; do
+			[[ -f ${x} ]] || continue
+			sed -i "/^libdir=/s:=.*:=${LIBPATH}/${MULTIDIR}:" "${x}" || die
+			mv "${x}" "${D}${FROMDIR}"/pkgconfig/libgcj-${GCC_PV}.pc || die
+		done
+	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}"${FROMDIR} >& /dev/null
+	done
+	find -depth "${ED}" -type d -exec rmdir {} + >& /dev/null
+}
+
+# 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() {
+	local libpath="$1"
+
+	pushd "${D}" >/dev/null
+
+	pushd "./${libpath}" >/dev/null
+	local dir="${PWD#${D%/}}"
+	local allarchives=$(echo *.la)
+	allarchives="\(${allarchives// /\\|}\)"
+	popd >/dev/null
+
+	# The libdir might not have any .la files. #548782
+	find "./${dir}" -maxdepth 1 -name '*.la' \
+		-exec sed -i -e "/^libdir=/s:=.*:='${dir}':" {} + || die
+	# Would be nice to combine these, but -maxdepth can not be specified
+	# on sub-expressions.
+	find "./${PREFIX}"/lib* -maxdepth 3 -name '*.la' \
+		-exec sed -i -e "/^dependency_libs=/s:/[^ ]*/${allarchives}:${libpath}/\1:g" {} + || die
+	find "./${dir}/" -maxdepth 1 -name '*.la' \
+		-exec sed -i -e "/^dependency_libs=/s:/[^ ]*/${allarchives}:${libpath}/\1:g" {} + || die
+
+	popd >/dev/null
+}
+
+create_gcc_env_entry() {
+	dodir /etc/env.d/gcc
+	local gcc_envd_base="/etc/env.d/gcc/${CTARGET}-${GCC_CONFIG_VER}"
+
+	local gcc_specs_file
+	local gcc_envd_file="${ED}${gcc_envd_base}"
+	if [[ -z $1 ]] ; then
+		# I'm leaving the following commented out to remind me that it
+		# was an insanely -bad- idea. Stuff broke. GCC_SPECS isnt unset
+		# on chroot or in non-toolchain.eclass gcc ebuilds!
+		#gcc_specs_file="${LIBPATH}/specs"
+		gcc_specs_file=""
+	else
+		gcc_envd_file+="-$1"
+		gcc_specs_file="${LIBPATH}/$1.specs"
+	fi
+
+	# 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 ldpaths mosdirs
+	local mdir mosdir abi ldpath
+	for abi in $(get_all_abis TARGET) ; do
+		mdir=$($(XGCC) $(get_abi_CFLAGS ${abi}) --print-multi-directory)
+		ldpath=${LIBPATH}
+		[[ ${mdir} != "." ]] && ldpath+="/${mdir}"
+		ldpaths="${ldpath}${ldpaths:+:${ldpaths}}"
+
+		mosdir=$($(XGCC) $(get_abi_CFLAGS ${abi}) -print-multi-os-directory)
+		mosdirs="${mosdir}${mosdirs:+:${mosdirs}}"
+	done
+
+	cat <<-EOF > ${gcc_envd_file}
+	GCC_PATH="${BINPATH}"
+	LDPATH="${ldpaths}"
+	MANPATH="${DATAPATH}/man"
+	INFOPATH="${DATAPATH}/info"
+	STDCXX_INCDIR="${STDCXX_INCDIR##*/}"
+	CTARGET="${CTARGET}"
+	GCC_SPECS="${gcc_specs_file}"
+	MULTIOSDIRS="${mosdirs}"
+	EOF
+}
+
+create_revdep_rebuild_entry() {
+	local revdep_rebuild_base="/etc/revdep-rebuild/05cross-${CTARGET}-${GCC_CONFIG_VER}"
+	local revdep_rebuild_file="${ED}${revdep_rebuild_base}"
+
+	is_crosscompile || return 0
+
+	dodir /etc/revdep-rebuild
+	cat <<-EOF > "${revdep_rebuild_file}"
+	# Generated by ${CATEGORY}/${PF}
+	# Ignore libraries built for ${CTARGET}, https://bugs.gentoo.org/692844.
+	SEARCH_DIRS_MASK="${LIBPATH}"
+	EOF
+}
+
+copy_minispecs_gcc_specs() {
+	# on gcc 6 we don't need minispecs
+	if tc_version_is_at_least 6.0 ; then
+		return 0
+	fi
+
+	# 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 ${LIBPATH#${EPREFIX}}
+	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.
+	if ! tc_version_is_at_least 4.4 ; then
+		$(XGCC) -dumpspecs > "${WORKDIR}"/specs/specs
+		cat "${WORKDIR}"/build.specs >> "${WORKDIR}"/specs/specs
+		doins "${WORKDIR}"/specs/specs || die "failed to install the specs file"
+	fi
+}
+
+gcc_slot_java() {
+	local x
+
+	# Move Java headers to compiler-specific dir
+	for x in "${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#${EPREFIX}}/include/${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#${EPREFIX}}/security
+		mv -f "${D}${PREFIX}"/lib*/security/* "${D}${LIBPATH}"/security
+		rm -rf "${D}${PREFIX}"/lib*/security
+	fi
+
+	# Move random gcj files to compiler-specific directories
+	for x in libgcj.spec logging.properties ; do
+		x="${D}${PREFIX}/lib/${x}"
+		[[ -f ${x} ]] && mv -f "${x}" "${D}${LIBPATH}"/
+	done
+
+	# 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
+}
+
+#---->> pkg_post* <<----
+
+toolchain_pkg_postinst() {
+	do_gcc_config
+	if [[ ! ${ROOT%/} && -f ${EPREFIX}/usr/share/eselect/modules/compiler-shadow.eselect ]] ; then
+		eselect compiler-shadow update all
+	fi
+
+	if ! is_crosscompile && [[ ${PN} != "kgcc64" ]] ; then
+		# gcc stopped installing .la files fixer in June 2020.
+		# Cleaning can be removed in June 2022.
+		rm -f "${EROOT%/}"/sbin/fix_libtool_files.sh
+		rm -f "${EROOT%/}"/usr/sbin/fix_libtool_files.sh
+		rm -f "${EROOT%/}"/usr/share/gcc-data/fixlafiles.awk
+	fi
+}
+
+toolchain_pkg_postrm() {
+	do_gcc_config
+	if [[ ! ${ROOT%/} && -f ${EPREFIX}/usr/share/eselect/modules/compiler-shadow.eselect ]] ; then
+		eselect compiler-shadow clean all
+	fi
+
+	# clean up the cruft left behind by cross-compilers
+	if is_crosscompile ; then
+		if [[ -z $(ls "${EROOT%/}"/etc/env.d/gcc/${CTARGET}* 2>/dev/null) ]] ; then
+			einfo "Removing last cross-compiler instance. Deleting dangling symlinks."
+			rm -f "${EROOT%/}"/etc/env.d/gcc/config-${CTARGET}
+			rm -f "${EROOT%/}"/etc/env.d/??gcc-${CTARGET}
+			rm -f "${EROOT%/}"/usr/bin/${CTARGET}-{gcc,{g,c}++}{,32,64}
+		fi
+		return 0
+	fi
+
+	# gcc stopped installing .la files fixer in June 2020.
+	# Cleaning can be removed in June 2022.
+	rm -f "${EROOT%/}"/sbin/fix_libtool_files.sh
+	rm -f "${EROOT%/}"/usr/share/gcc-data/fixlafiles.awk
+}
+
+do_gcc_config() {
+	if ! should_we_gcc_config ; then
+		gcc-config --use-old --force
+		return 0
+	fi
+
+	local current_gcc_config target
+
+	current_gcc_config=$(gcc-config -c ${CTARGET} 2>/dev/null)
+	if [[ -n ${current_gcc_config} ]] ; then
+		local current_specs use_specs
+		# figure out which specs-specific config is active
+		current_specs=$(gcc-config -S ${current_gcc_config} | awk '{print $3}')
+		[[ -n ${current_specs} ]] && use_specs=-${current_specs}
+
+		if [[ -n ${use_specs} ]] && \
+		   [[ ! -e ${EROOT%/}/etc/env.d/gcc/${CTARGET}-${GCC_CONFIG_VER}${use_specs} ]]
+		then
+			ewarn "The currently selected specs-specific gcc config,"
+			ewarn "${current_specs}, doesn't exist anymore. This is usually"
+			ewarn "due to enabling/disabling hardened or switching to a version"
+			ewarn "of gcc that doesnt create multiple specs files. The default"
+			ewarn "config will be used, and the previous preference forgotten."
+			use_specs=""
+		fi
+
+		target="${CTARGET}-${GCC_CONFIG_VER}${use_specs}"
+	else
+		# The curent target is invalid.  Attempt to switch to a valid one.
+		# Blindly pick the latest version.  #529608
+		# TODO: Should update gcc-config to accept `-l ${CTARGET}` rather than
+		# doing a partial grep like this.
+		target=$(gcc-config -l 2>/dev/null | grep " ${CTARGET}-[0-9]" | tail -1 | awk '{print $2}')
+	fi
+
+	gcc-config "${target}"
+}
+
+should_we_gcc_config() {
+	# 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=$(gcc-config -c ${CTARGET} 2>&1) || return 0
+
+	# if the previously selected config has the same major.minor (branch) as
+	# the version we are installing, then it will probably be uninstalled
+	# for being in the same SLOT, make sure we run gcc-config.
+	local curr_config_ver=$(gcc-config -S ${curr_config} | awk '{print $2}')
+
+	local curr_branch_ver=$(ver_cut 1-2 ${curr_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).
+		# Only warn if we're installing a pkg as we might be called from
+		# the pkg_{pre,post}rm steps.  #446830
+		if [[ ${EBUILD_PHASE} == *"inst" ]] ; then
+			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
+		fi
+		return 1
+	fi
+}
+
+#---->> support and misc functions <<----
+
+# 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}
+}
+
+_tc_use_if_iuse() {
+	in_iuse $1 && use $1
+}
+
+is_ada() {
+	gcc-lang-supported ada || return 1
+	_tc_use_if_iuse ada
+}
+
+is_cxx() {
+	gcc-lang-supported 'c++' || return 1
+	_tc_use_if_iuse cxx
+}
+
+is_d() {
+	gcc-lang-supported d || return 1
+	_tc_use_if_iuse d
+}
+
+is_f77() {
+	gcc-lang-supported f77 || return 1
+	_tc_use_if_iuse fortran
+}
+
+is_f95() {
+	gcc-lang-supported f95 || return 1
+	_tc_use_if_iuse fortran
+}
+
+is_fortran() {
+	gcc-lang-supported fortran || return 1
+	_tc_use_if_iuse fortran
+}
+
+is_gcj() {
+	gcc-lang-supported java || return 1
+	_tc_use_if_iuse cxx && _tc_use_if_iuse gcj
+}
+
+is_go() {
+	gcc-lang-supported go || return 1
+	_tc_use_if_iuse cxx && _tc_use_if_iuse go
+}
+
+is_jit() {
+	gcc-lang-supported jit || return 1
+	# cross-compiler does not really support jit as it has
+	# to generate code for a target. On target like avr
+	# libgcclit.so can't link at all: bug #594572
+	is_crosscompile && return 1
+	_tc_use_if_iuse jit
+}
+
+is_multilib() {
+	_tc_use_if_iuse multilib
+}
+
+is_objc() {
+	gcc-lang-supported objc || return 1
+	_tc_use_if_iuse objc
+}
+
+is_objcxx() {
+	gcc-lang-supported 'obj-c++' || return 1
+	_tc_use_if_iuse cxx && _tc_use_if_iuse objc++
+}
+
+# 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_use_if_iuse nopie && return 1
+		hardened_gcc_is_stable pie
+		return $?
+	elif [[ $1 == "ssp" ]] ; then
+		[[ -n ${SPECS_VER} ]] || return 1
+		_tc_use_if_iuse nossp && return 1
+		hardened_gcc_is_stable ssp
+		return $?
+	else
+		# laziness ;)
+		hardened_gcc_works pie || return 1
+		hardened_gcc_works ssp || return 1
+		return 0
+	fi
+}
+
+hardened_gcc_is_stable() {
+	local tocheck
+	if [[ $1 == "pie" ]] ; then
+		if [[ ${CTARGET} == *-uclibc* ]] ; then
+			tocheck=${PIE_UCLIBC_STABLE}
+		else
+			tocheck=${PIE_GLIBC_STABLE}
+		fi
+	elif [[ $1 == "ssp" ]] ; then
+		if [[ ${CTARGET} == *-uclibc* ]] ; then
+			tocheck=${SSP_UCLIBC_STABLE}
+		elif  [[ ${CTARGET} == *-gnu* ]] ; then
+			tocheck=${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
+}
+
+want_minispecs() {
+	# on gcc 6 we don't need minispecs
+	if tc_version_is_at_least 6.0 ; then
+		return 0
+	fi
+	if tc_version_is_at_least 4.3.2 && _tc_use_if_iuse hardened ; then
+		if ! want_pie ; then
+			ewarn "PIE_VER or SPECS_VER is not defined in the GCC ebuild."
+		elif use vanilla ; then
+			ewarn "You will not get hardened features if you have the vanilla USE-flag."
+		elif _tc_use_if_iuse nopie && _tc_use_if_iuse nossp ; then
+			ewarn "You will not get hardened features if you have the nopie and nossp USE-flag."
+		elif ! hardened_gcc_works ; 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
+}
+
+want_pie() {
+	! _tc_use_if_iuse hardened && [[ -n ${PIE_VER} ]] \
+		&& _tc_use_if_iuse nopie && return 1
+	[[ -n ${PIE_VER} ]] && [[ -n ${SPECS_VER} ]] && return 0
+	tc_version_is_at_least 4.3.2 && return 1
+	[[ -z ${PIE_VER} ]] && return 1
+	_tc_use_if_iuse nopie || return 0
+	return 1
+}
+
+has toolchain_death_notice ${EBUILD_DEATH_HOOKS} || EBUILD_DEATH_HOOKS+=" toolchain_death_notice"
+toolchain_death_notice() {
+	if [[ -e "${WORKDIR}"/build ]] ; then
+		pushd "${WORKDIR}"/build >/dev/null
+		(echo '' | $(tc-getCC ${CTARGET}) ${CFLAGS} -v -E - 2>&1) > gccinfo.log
+		[[ -e "${T}"/build.log ]] && cp "${T}"/build.log .
+		tar jcf "${WORKDIR}"/gcc-build-logs.tar.bz2 \
+			gccinfo.log build.log $(find -name config.log)
+		rm gccinfo.log build.log
+		eerror
+		eerror "Please include ${WORKDIR}/gcc-build-logs.tar.bz2 in your bug report."
+		eerror
+		popd >/dev/null
+	fi
+}
+
+# Note [implicitly enabled flags]
+# -------------------------------
+# Usually configure-based packages handle explicit feature requests
+# like
+#     ./configure --enable-foo
+# as explicit request to check for support of 'foo' and bail out at
+# configure time.
+#
+# GCC does not follow this pattern and instead overrides autodetection
+# of the feature and enables it unconditionally.
+# See bugs:
+#    https://gcc.gnu.org/PR85663 (libsanitizer on mips)
+#    https://bugs.gentoo.org/661252 (libvtv on powerpc64)
+#
+# Thus safer way to enable/disable the feature is to rely on implicit
+# enabled-by-default state:
+#    econf $(usex foo '' --disable-foo)