dev-embedded/hps-sdk/hps-sdk-0.0.1.ebuild - third_party/overlays/chromiumos-overlay - Git at Google

 # Copyright 2022 The ChromiumOS Authors
 # Distributed under the terms of the GNU General Public License v2

 EAPI=7

 PYTHON_COMPAT=( python3_{6..9} )

 inherit cros-constants python-any-r1

 DESCRIPTION="Compilers for building HPS firmware"
 HOMEPAGE="https://chromium.googlesource.com/chromiumos/platform/hps-firmware"
 LICENSE="|| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4 UoI-NCSA GPL-3 LGPL-3 libgcc FDL-1.2"
 KEYWORDS="*"
 SLOT="0"

 RUST_VERSION="1.62.1"
 RUST_BOOTSTRAP_VERSION="1.61.0"
 RUST_BOOTSTRAP_HOST_TRIPLE="x86_64-unknown-linux-gnu"
 MIRI_REV="ea63a695c8ba0f4322f21074f7646e0ea9f43001"

 # These revisions match the submodules in
 # https://github.com/riscv-collab/riscv-gnu-toolchain/tree/2021.04.23
 BINUTILS_REV="f35674005e609660f5f45005a9e095541ca4c5fe"
 GCC_REV="03cb20e5433cd8e65af6a1a6baaf3fe4c72785f6"

 SRC_URI="
 	https://static.rust-lang.org/dist/rustc-${RUST_VERSION}-src.tar.gz
 	https://static.rust-lang.org/dist/rustc-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}.tar.xz
 	https://static.rust-lang.org/dist/rust-std-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}.tar.xz
 	https://static.rust-lang.org/dist/cargo-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}.tar.xz
 	https://github.com/rust-lang/miri/archive/${MIRI_REV}.tar.gz -> miri-${MIRI_REV}.tar.gz
 	https://github.com/riscv-collab/riscv-binutils-gdb/archive/${BINUTILS_REV}.tar.gz -> riscv-binutils-gdb-${BINUTILS_REV}.tar.gz
 	https://github.com/riscv-collab/riscv-gcc/archive/${GCC_REV}.tar.gz -> riscv-gcc-${GCC_REV}.tar.gz
 	ftp://sourceware.org/pub/newlib/newlib-4.1.0.tar.gz
 "

 S="${WORKDIR}"

 pkg_setup() {
 	python-any-r1_pkg_setup
 }

 src_unpack() {
 	default

 	### RUST ###

 	# Copy bootstrap std to where bootstrap rustc will find it
 	local rust_std_dir="${WORKDIR}/rust-std-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/rust-std-${RUST_BOOTSTRAP_HOST_TRIPLE}"
 	local rustc_dir="${WORKDIR}/rustc-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/rustc"
 	cp -a \
 		"${rust_std_dir}/lib/rustlib/${RUST_BOOTSTRAP_HOST_TRIPLE}" \
 		"${rustc_dir}/lib/rustlib/" \
 		|| die

 	# Replace rustc's bundled copy of miri (which is not expected to work)
 	# with the miri we fetched and unpacked
 	rm -r "${WORKDIR}/rustc-${RUST_VERSION}-src/src/tools/miri"
 	mv "${WORKDIR}/miri-${MIRI_REV}" "${WORKDIR}/rustc-${RUST_VERSION}-src/src/tools/miri"
 }

 src_prepare() {
 	default

 	### RUST ###

 	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" || die

 	# Copy "unknown" vendor targets to create cros_sdk target triple
 	# variants as referred to in 0001-add-cros-targets.patch and RUSTC_TARGET_TRIPLES.
 	# armv7a is treated specially because the cros toolchain differs in
 	# more than just the vendor part of the target triple. The arch is
 	# armv7a in cros versus armv7.
 	pushd compiler/rustc_target/src/spec || die
 	sed -e 's:"unknown":"pc":g' x86_64_unknown_linux_gnu.rs >x86_64_pc_linux_gnu.rs || die
 	sed -e 's:"unknown":"cros":g' x86_64_unknown_linux_gnu.rs >x86_64_cros_linux_gnu.rs || die
 	sed -e 's:"unknown":"cros":g' armv7_unknown_linux_gnueabihf.rs >armv7a_cros_linux_gnueabihf.rs || die
 	sed -e 's:"unknown":"cros":g' aarch64_unknown_linux_gnu.rs >aarch64_cros_linux_gnu.rs || die
 	popd || die

 	eapply "${FILESDIR}/rust-add-cros-targets.patch"
 	eapply "${FILESDIR}/rust-fix-rpath.patch"
 	eapply "${FILESDIR}/rust-Revert-CMake-Unconditionally-add-.h-and-.td-files-to.patch"
 	eapply "${FILESDIR}/rust-no-test-on-build.patch"
 	eapply "${FILESDIR}/rust-sanitizer-supported.patch"
 	eapply "${FILESDIR}/rust-cc.patch"
 	eapply "${FILESDIR}/rust-revert-libunwind-build.patch"
 	eapply "${FILESDIR}/rust-ld-argv0.patch"
 	eapply "${FILESDIR}/rust-Handle-sparse-git-repo-without-erroring.patch"
 	eapply "${FILESDIR}/rust-disable-mutable-noalias.patch"
 	eapply "${FILESDIR}/rust-add-armv7a-sanitizers.patch"
 	eapply "${FILESDIR}/rust-passes-only-in-pre-link.patch"
 	eapply "${FILESDIR}/rust-Don-t-build-std-for-uefi-targets.patch"
 	eapply "${FILESDIR}/rust-Bump-cc-version-in-bootstrap-to-fix-build-of-uefi-ta.patch"

 	# For the rustc_llvm module, the build will link with -nodefaultlibs and manually choose the
 	# std C++ library. For x86_64 Linux, the build script always chooses libstdc++ which will not
 	# work if LLVM was built with USE="default-libcxx". This snippet changes that choice to libc++
 	# in the case that clang++ defaults to libc++.
 	if "${CXX}" -### -x c++ - < /dev/null 2>&1 | grep -q -e '-lc++'; then
 		sed -i 's:"stdc++":"c++":g' compiler/rustc_llvm/build.rs || die
 	fi

 	### GCC ###

 	cd "${WORKDIR}/riscv-gcc-${GCC_REV}" || die
 	eapply "${FILESDIR}/gcc-10.2.0-avoid-unprefixed-ld-in-configure-checks.patch"
 }

 src_configure() {
 	### RUST ###

 	tc-export PKG_CONFIG

 	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" || die
 	cat >config.toml <<EOF
 [build]
 target = [
 	"x86_64-unknown-linux-gnu",
 	"x86_64-pc-linux-gnu",
 	"aarch64-cros-linux-gnu",
 	"armv7a-cros-linux-gnueabihf",
 	"x86_64-cros-linux-gnu",
 	"thumbv6m-none-eabi",
 	"riscv32i-unknown-none-elf",
 ]
 cargo = "${WORKDIR}/cargo-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/cargo/bin/cargo"
 rustc = "${WORKDIR}/rustc-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/rustc/bin/rustc"
 docs = false
 submodules = false
 python = "${EPYTHON}"
 vendor = true
 extended = true
 tools = ["cargo", "cargo-miri", "miri", "src"]
 sanitizers = false
 profiler = false

 [llvm]
 ninja = true
 targets = "AArch64;ARM;RISCV;X86"
 experimental-targets = ""
 static-libstdcpp = false

 [install]
 prefix = "${D}/opt/hps-sdk"
 sysconfdir = "etc"
 mandir = "share/man"

 [rust]
 description = "${PF}"
 channel = "nightly"
 codegen-units = 0
 llvm-libunwind = 'in-tree'
 codegen-tests = false
 new-symbol-mangling = true
 lld = false
 use-lld = false
 default-linker = "${CBUILD}-clang"

 [target.x86_64-unknown-linux-gnu]
 cc = "${CBUILD}-clang"
 cxx = "${CBUILD}-clang++"
 linker = "${CBUILD}-clang++"

 [target.x86_64-pc-linux-gnu]
 cc = "${CBUILD}-clang"
 cxx = "${CBUILD}-clang++"
 linker = "${CBUILD}-clang++"

 [target.aarch64-cros-linux-gnu]
 cc = "aarch64-cros-linux-gnu-clang"
 cxx = "aarch64-cros-linux-gnu-clang++"
 linker = "aarch64-cros-linux-gnu-clang++"

 [target.armv7a-cros-linux-gnueabihf]
 cc = "armv7a-cros-linux-gnueabihf-clang"
 cxx = "armv7a-cros-linux-gnueabihf-clang++"
 linker = "armv7a-cros-linux-gnueabihf-clang++"

 [target.x86_64-cros-linux-gnu]
 cc = "x86_64-cros-linux-gnu-clang"
 cxx = "x86_64-cros-linux-gnu-clang++"
 linker = "x86_64-cros-linux-gnu-clang++"

 [target.thumbv6m-none-eabi]
 cc = "armv7m-cros-eabi-clang"
 cxx = "armv7m-cros-eabi-clang++"
 linker = "armv7m-cros-eabi-clang++"

 [target.riscv32i-unknown-none-elf]
 cc = "clang"
 cxx = "clang++"
 linker = "ld.lld"
 EOF

 	### GCC ###

 	# Work around a defective check in libiberty ./configure which invokes unprefixed 'cc'
 	export ac_cv_prog_cc_x86_64_pc_linux_gnu_clang_c_o=yes
 	export ac_cv_prog_cc_cc_c_o=yes
 }

 src_compile() {
 	### RUST ###

 	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" || die
 	${EPYTHON} x.py build --stage 2 || die

 	### GCC ###

 	# Build binutils
 	mkdir "${WORKDIR}/build-binutils" || die
 	(
 		cd "${WORKDIR}/build-binutils" || die
 		"${WORKDIR}/riscv-binutils-gdb-${BINUTILS_REV}/configure" \
 			--host="${CHOST}" \
 			--target=riscv64-unknown-elf \
 			--prefix=/opt/hps-sdk \
 			--disable-werror \
 			--disable-gdb \
 			--disable-sim \
 			--disable-libdecnumber \
 			--disable-readline \
 			|| die
 		emake
 		# Install under $WORKDIR so that GCC stage 1 can find it.
 		# We install for real under $D in src_install.
 		emake install DESTDIR="${WORKDIR}/installed-stage1"
 	)

 	# Build GCC stage 1
 	mkdir "${WORKDIR}/build-gcc-stage1" || die
 	(
 		# shellcheck disable=SC2030,SC2031  # subshell is intentional
 		export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
 		cd "${WORKDIR}/build-gcc-stage1" || die
 		"${WORKDIR}/riscv-gcc-${GCC_REV}/configure" \
 			--host="${CHOST}" \
 			--target=riscv64-unknown-elf \
 			--prefix="${WORKDIR}/installed-stage1/opt/hps-sdk" \
 			--with-sysroot="${WORKDIR}/installed-stage1/opt/hps-sdk/riscv64-unknown-elf" \
 			--disable-shared \
 			--disable-threads \
 			--disable-tls \
 			--enable-languages=c,c++ \
 			--with-system-zlib \
 			--with-newlib \
 			--disable-libmudflap \
 			--disable-libssp \
 			--disable-libquadmath \
 			--disable-libgomp \
 			--disable-nls \
 			--disable-tm-clone-registry \
 			--src="${WORKDIR}/riscv-gcc-${GCC_REV}" \
 			--enable-multilib \
 			--with-multilib-generator="rv32im-ilp32--" \
 			CFLAGS_FOR_TARGET="-Os" \
 			CXXFLAGS_FOR_TARGET="-Os" \
 			|| die
 		emake all-gcc
 		emake install-gcc
 	)

 	# Build newlib
 	mkdir "${WORKDIR}/build-newlib" || die
 	(
 		# shellcheck disable=SC2030,SC2031  # subshell is intentional
 		export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
 		cd "${WORKDIR}/build-newlib" || die
 		# TODO(dcallagh): should use the "nano" configuration with -Os probably
 		"${WORKDIR}/newlib-4.1.0/configure" \
 			--host="${CHOST}" \
 			--target=riscv64-unknown-elf \
 			--prefix=/opt/hps-sdk \
 			--enable-newlib-io-long-double \
 			--enable-newlib-io-long-long \
 			--enable-newlib-io-c99-formats \
 			--enable-newlib-register-fini \
 			CFLAGS_FOR_TARGET="-O2 -D_POSIX_MODE" \
 			CXXFLAGS_FOR_TARGET="-O2 -D_POSIX_MODE" \
 			|| die
 		emake
 		emake install DESTDIR="${WORKDIR}/installed-stage1"
 	)

 	# Build GCC stage 2
 	mkdir "${WORKDIR}/build-gcc-stage2" || die
 	(
 		# shellcheck disable=SC2030,SC2031  # subshell is intentional
 		export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
 		cd "${WORKDIR}/build-gcc-stage2" || die
 		# TODO(dcallagh): the riscv-gnu-toolchain Makefile passes --enable-tls
 		# here, but I don't think it's wanted and I don't see how it could work
 		"${WORKDIR}/riscv-gcc-${GCC_REV}/configure" \
 			--host="${CHOST}" \
 			--target=riscv64-unknown-elf \
 			--prefix=/opt/hps-sdk \
 			--with-sysroot=/opt/hps-sdk/riscv64-unknown-elf \
 			--with-build-sysroot="${WORKDIR}/installed-stage1/opt/hps-sdk/riscv64-unknown-elf" \
 			--with-native-system-header-dir=/include \
 			--disable-shared \
 			--disable-threads \
 			--disable-tls \
 			--enable-languages=c,c++ \
 			--with-system-zlib \
 			--with-newlib \
 			--disable-libmudflap \
 			--disable-libssp \
 			--disable-libquadmath \
 			--disable-libgomp \
 			--disable-nls \
 			--disable-tm-clone-registry \
 			--src="${WORKDIR}/riscv-gcc-${GCC_REV}" \
 			--enable-multilib \
 			--with-multilib-generator="rv32im-ilp32--" \
 			CFLAGS_FOR_TARGET="-Os" \
 			CXXFLAGS_FOR_TARGET="-Os" \
 			|| die
 		emake
 	)
 }

 src_install() {
 	### RUST ###

 	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" || die
 	${EPYTHON} x.py install || die

 	### GCC ###

 	# shellcheck disable=SC2030,SC2031  # subshell is intentional
 	export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
 	emake -C "${WORKDIR}/build-binutils" install DESTDIR="${D}"
 	emake -C "${WORKDIR}/build-newlib" install DESTDIR="${D}"
 	emake -C "${WORKDIR}/build-gcc-stage2" install DESTDIR="${D}"
 }
	# Copyright 2022 The ChromiumOS Authors
	# Distributed under the terms of the GNU General Public License v2

	EAPI=7

	PYTHON_COMPAT=( python3_{6..9} )

	inherit cros-constants python-any-r1

	DESCRIPTION="Compilers for building HPS firmware"
	HOMEPAGE="https://chromium.googlesource.com/chromiumos/platform/hps-firmware"
	LICENSE="\|\| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4 UoI-NCSA GPL-3 LGPL-3 libgcc FDL-1.2"
	KEYWORDS="*"
	SLOT="0"

	RUST_VERSION="1.62.1"
	RUST_BOOTSTRAP_VERSION="1.61.0"
	RUST_BOOTSTRAP_HOST_TRIPLE="x86_64-unknown-linux-gnu"
	MIRI_REV="ea63a695c8ba0f4322f21074f7646e0ea9f43001"

	# These revisions match the submodules in
	# https://github.com/riscv-collab/riscv-gnu-toolchain/tree/2021.04.23
	BINUTILS_REV="f35674005e609660f5f45005a9e095541ca4c5fe"
	GCC_REV="03cb20e5433cd8e65af6a1a6baaf3fe4c72785f6"

	SRC_URI="
	https://static.rust-lang.org/dist/rustc-${RUST_VERSION}-src.tar.gz
	https://static.rust-lang.org/dist/rustc-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}.tar.xz
	https://static.rust-lang.org/dist/rust-std-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}.tar.xz
	https://static.rust-lang.org/dist/cargo-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}.tar.xz
	https://github.com/rust-lang/miri/archive/${MIRI_REV}.tar.gz -> miri-${MIRI_REV}.tar.gz
	https://github.com/riscv-collab/riscv-binutils-gdb/archive/${BINUTILS_REV}.tar.gz -> riscv-binutils-gdb-${BINUTILS_REV}.tar.gz
	https://github.com/riscv-collab/riscv-gcc/archive/${GCC_REV}.tar.gz -> riscv-gcc-${GCC_REV}.tar.gz
	ftp://sourceware.org/pub/newlib/newlib-4.1.0.tar.gz
	"

	S="${WORKDIR}"

	pkg_setup() {
	python-any-r1_pkg_setup
	}

	src_unpack() {
	default

	### RUST ###

	# Copy bootstrap std to where bootstrap rustc will find it
	local rust_std_dir="${WORKDIR}/rust-std-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/rust-std-${RUST_BOOTSTRAP_HOST_TRIPLE}"
	local rustc_dir="${WORKDIR}/rustc-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/rustc"
	cp -a \
	"${rust_std_dir}/lib/rustlib/${RUST_BOOTSTRAP_HOST_TRIPLE}" \
	"${rustc_dir}/lib/rustlib/" \
	\|\| die

	# Replace rustc's bundled copy of miri (which is not expected to work)
	# with the miri we fetched and unpacked
	rm -r "${WORKDIR}/rustc-${RUST_VERSION}-src/src/tools/miri"
	mv "${WORKDIR}/miri-${MIRI_REV}" "${WORKDIR}/rustc-${RUST_VERSION}-src/src/tools/miri"
	}

	src_prepare() {
	default

	### RUST ###

	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" \|\| die

	# Copy "unknown" vendor targets to create cros_sdk target triple
	# variants as referred to in 0001-add-cros-targets.patch and RUSTC_TARGET_TRIPLES.
	# armv7a is treated specially because the cros toolchain differs in
	# more than just the vendor part of the target triple. The arch is
	# armv7a in cros versus armv7.
	pushd compiler/rustc_target/src/spec \|\| die
	sed -e 's:"unknown":"pc":g' x86_64_unknown_linux_gnu.rs >x86_64_pc_linux_gnu.rs \|\| die
	sed -e 's:"unknown":"cros":g' x86_64_unknown_linux_gnu.rs >x86_64_cros_linux_gnu.rs \|\| die
	sed -e 's:"unknown":"cros":g' armv7_unknown_linux_gnueabihf.rs >armv7a_cros_linux_gnueabihf.rs \|\| die
	sed -e 's:"unknown":"cros":g' aarch64_unknown_linux_gnu.rs >aarch64_cros_linux_gnu.rs \|\| die
	popd \|\| die

	eapply "${FILESDIR}/rust-add-cros-targets.patch"
	eapply "${FILESDIR}/rust-fix-rpath.patch"
	eapply "${FILESDIR}/rust-Revert-CMake-Unconditionally-add-.h-and-.td-files-to.patch"
	eapply "${FILESDIR}/rust-no-test-on-build.patch"
	eapply "${FILESDIR}/rust-sanitizer-supported.patch"
	eapply "${FILESDIR}/rust-cc.patch"
	eapply "${FILESDIR}/rust-revert-libunwind-build.patch"
	eapply "${FILESDIR}/rust-ld-argv0.patch"
	eapply "${FILESDIR}/rust-Handle-sparse-git-repo-without-erroring.patch"
	eapply "${FILESDIR}/rust-disable-mutable-noalias.patch"
	eapply "${FILESDIR}/rust-add-armv7a-sanitizers.patch"
	eapply "${FILESDIR}/rust-passes-only-in-pre-link.patch"
	eapply "${FILESDIR}/rust-Don-t-build-std-for-uefi-targets.patch"
	eapply "${FILESDIR}/rust-Bump-cc-version-in-bootstrap-to-fix-build-of-uefi-ta.patch"

	# For the rustc_llvm module, the build will link with -nodefaultlibs and manually choose the
	# std C++ library. For x86_64 Linux, the build script always chooses libstdc++ which will not
	# work if LLVM was built with USE="default-libcxx". This snippet changes that choice to libc++
	# in the case that clang++ defaults to libc++.
	if "${CXX}" -### -x c++ - < /dev/null 2>&1 \| grep -q -e '-lc++'; then
	sed -i 's:"stdc++":"c++":g' compiler/rustc_llvm/build.rs \|\| die
	fi

	### GCC ###

	cd "${WORKDIR}/riscv-gcc-${GCC_REV}" \|\| die
	eapply "${FILESDIR}/gcc-10.2.0-avoid-unprefixed-ld-in-configure-checks.patch"
	}

	src_configure() {
	### RUST ###

	tc-export PKG_CONFIG

	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" \|\| die
	cat >config.toml <<EOF
	[build]
	target = [
	"x86_64-unknown-linux-gnu",
	"x86_64-pc-linux-gnu",
	"aarch64-cros-linux-gnu",
	"armv7a-cros-linux-gnueabihf",
	"x86_64-cros-linux-gnu",
	"thumbv6m-none-eabi",
	"riscv32i-unknown-none-elf",
	]
	cargo = "${WORKDIR}/cargo-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/cargo/bin/cargo"
	rustc = "${WORKDIR}/rustc-${RUST_BOOTSTRAP_VERSION}-${RUST_BOOTSTRAP_HOST_TRIPLE}/rustc/bin/rustc"
	docs = false
	submodules = false
	python = "${EPYTHON}"
	vendor = true
	extended = true
	tools = ["cargo", "cargo-miri", "miri", "src"]
	sanitizers = false
	profiler = false

	[llvm]
	ninja = true
	targets = "AArch64;ARM;RISCV;X86"
	experimental-targets = ""
	static-libstdcpp = false

	[install]
	prefix = "${D}/opt/hps-sdk"
	sysconfdir = "etc"
	mandir = "share/man"

	[rust]
	description = "${PF}"
	channel = "nightly"
	codegen-units = 0
	llvm-libunwind = 'in-tree'
	codegen-tests = false
	new-symbol-mangling = true
	lld = false
	use-lld = false
	default-linker = "${CBUILD}-clang"

	[target.x86_64-unknown-linux-gnu]
	cc = "${CBUILD}-clang"
	cxx = "${CBUILD}-clang++"
	linker = "${CBUILD}-clang++"

	[target.x86_64-pc-linux-gnu]
	cc = "${CBUILD}-clang"
	cxx = "${CBUILD}-clang++"
	linker = "${CBUILD}-clang++"

	[target.aarch64-cros-linux-gnu]
	cc = "aarch64-cros-linux-gnu-clang"
	cxx = "aarch64-cros-linux-gnu-clang++"
	linker = "aarch64-cros-linux-gnu-clang++"

	[target.armv7a-cros-linux-gnueabihf]
	cc = "armv7a-cros-linux-gnueabihf-clang"
	cxx = "armv7a-cros-linux-gnueabihf-clang++"
	linker = "armv7a-cros-linux-gnueabihf-clang++"

	[target.x86_64-cros-linux-gnu]
	cc = "x86_64-cros-linux-gnu-clang"
	cxx = "x86_64-cros-linux-gnu-clang++"
	linker = "x86_64-cros-linux-gnu-clang++"

	[target.thumbv6m-none-eabi]
	cc = "armv7m-cros-eabi-clang"
	cxx = "armv7m-cros-eabi-clang++"
	linker = "armv7m-cros-eabi-clang++"

	[target.riscv32i-unknown-none-elf]
	cc = "clang"
	cxx = "clang++"
	linker = "ld.lld"
	EOF

	### GCC ###

	# Work around a defective check in libiberty ./configure which invokes unprefixed 'cc'
	export ac_cv_prog_cc_x86_64_pc_linux_gnu_clang_c_o=yes
	export ac_cv_prog_cc_cc_c_o=yes
	}

	src_compile() {
	### RUST ###

	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" \|\| die
	${EPYTHON} x.py build --stage 2 \|\| die

	### GCC ###

	# Build binutils
	mkdir "${WORKDIR}/build-binutils" \|\| die
	(
	cd "${WORKDIR}/build-binutils" \|\| die
	"${WORKDIR}/riscv-binutils-gdb-${BINUTILS_REV}/configure" \
	--host="${CHOST}" \
	--target=riscv64-unknown-elf \
	--prefix=/opt/hps-sdk \
	--disable-werror \
	--disable-gdb \
	--disable-sim \
	--disable-libdecnumber \
	--disable-readline \
	\|\| die
	emake
	# Install under $WORKDIR so that GCC stage 1 can find it.
	# We install for real under $D in src_install.
	emake install DESTDIR="${WORKDIR}/installed-stage1"
	)

	# Build GCC stage 1
	mkdir "${WORKDIR}/build-gcc-stage1" \|\| die
	(
	# shellcheck disable=SC2030,SC2031 # subshell is intentional
	export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
	cd "${WORKDIR}/build-gcc-stage1" \|\| die
	"${WORKDIR}/riscv-gcc-${GCC_REV}/configure" \
	--host="${CHOST}" \
	--target=riscv64-unknown-elf \
	--prefix="${WORKDIR}/installed-stage1/opt/hps-sdk" \
	--with-sysroot="${WORKDIR}/installed-stage1/opt/hps-sdk/riscv64-unknown-elf" \
	--disable-shared \
	--disable-threads \
	--disable-tls \
	--enable-languages=c,c++ \
	--with-system-zlib \
	--with-newlib \
	--disable-libmudflap \
	--disable-libssp \
	--disable-libquadmath \
	--disable-libgomp \
	--disable-nls \
	--disable-tm-clone-registry \
	--src="${WORKDIR}/riscv-gcc-${GCC_REV}" \
	--enable-multilib \
	--with-multilib-generator="rv32im-ilp32--" \
	CFLAGS_FOR_TARGET="-Os" \
	CXXFLAGS_FOR_TARGET="-Os" \
	\|\| die
	emake all-gcc
	emake install-gcc
	)

	# Build newlib
	mkdir "${WORKDIR}/build-newlib" \|\| die
	(
	# shellcheck disable=SC2030,SC2031 # subshell is intentional
	export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
	cd "${WORKDIR}/build-newlib" \|\| die
	# TODO(dcallagh): should use the "nano" configuration with -Os probably
	"${WORKDIR}/newlib-4.1.0/configure" \
	--host="${CHOST}" \
	--target=riscv64-unknown-elf \
	--prefix=/opt/hps-sdk \
	--enable-newlib-io-long-double \
	--enable-newlib-io-long-long \
	--enable-newlib-io-c99-formats \
	--enable-newlib-register-fini \
	CFLAGS_FOR_TARGET="-O2 -D_POSIX_MODE" \
	CXXFLAGS_FOR_TARGET="-O2 -D_POSIX_MODE" \
	\|\| die
	emake
	emake install DESTDIR="${WORKDIR}/installed-stage1"
	)

	# Build GCC stage 2
	mkdir "${WORKDIR}/build-gcc-stage2" \|\| die
	(
	# shellcheck disable=SC2030,SC2031 # subshell is intentional
	export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
	cd "${WORKDIR}/build-gcc-stage2" \|\| die
	# TODO(dcallagh): the riscv-gnu-toolchain Makefile passes --enable-tls
	# here, but I don't think it's wanted and I don't see how it could work
	"${WORKDIR}/riscv-gcc-${GCC_REV}/configure" \
	--host="${CHOST}" \
	--target=riscv64-unknown-elf \
	--prefix=/opt/hps-sdk \
	--with-sysroot=/opt/hps-sdk/riscv64-unknown-elf \
	--with-build-sysroot="${WORKDIR}/installed-stage1/opt/hps-sdk/riscv64-unknown-elf" \
	--with-native-system-header-dir=/include \
	--disable-shared \
	--disable-threads \
	--disable-tls \
	--enable-languages=c,c++ \
	--with-system-zlib \
	--with-newlib \
	--disable-libmudflap \
	--disable-libssp \
	--disable-libquadmath \
	--disable-libgomp \
	--disable-nls \
	--disable-tm-clone-registry \
	--src="${WORKDIR}/riscv-gcc-${GCC_REV}" \
	--enable-multilib \
	--with-multilib-generator="rv32im-ilp32--" \
	CFLAGS_FOR_TARGET="-Os" \
	CXXFLAGS_FOR_TARGET="-Os" \
	\|\| die
	emake
	)
	}

	src_install() {
	### RUST ###

	cd "${WORKDIR}/rustc-${RUST_VERSION}-src" \|\| die
	${EPYTHON} x.py install \|\| die

	### GCC ###

	# shellcheck disable=SC2030,SC2031 # subshell is intentional
	export PATH="${WORKDIR}/installed-stage1/opt/hps-sdk/bin:${PATH}"
	emake -C "${WORKDIR}/build-binutils" install DESTDIR="${D}"
	emake -C "${WORKDIR}/build-newlib" install DESTDIR="${D}"
	emake -C "${WORKDIR}/build-gcc-stage2" install DESTDIR="${D}"
	}