dev-lang/rust: bump to 1.51.0

Package-Manager: Portage-3.0.18, Repoman-3.0.3
Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org>

2 files changed, 631 insertions, 0 deletions

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 74eff5ba8e9e..bf8c6e61d042 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -68,8 +68,23 @@ DIST rust-1.49.0-powerpc64le-unknown-linux-gnu.tar.xz 169253520 BLAKE2B 4648467a
 DIST rust-1.49.0-s390x-unknown-linux-gnu.tar.xz 170753008 BLAKE2B a81618240d86d4a70bd27f3e33caf0258868539b3b081a8f8f461a3debf82ab1493fea18dd5a32083d1f34db268f4bff471f5f45fb3d4910dd9559f227dc3aab SHA512 25259ea2e499c89459b14571e2c54f230d642af9cfe539dc2b8be15eff0e23b8c6e60af4c567bcbb6c6c185b4537eaab19c3395fce48b1f6e5ef1234efc31e3a
 DIST rust-1.49.0-x86_64-unknown-linux-gnu.tar.xz 144752500 BLAKE2B 188fafdbff02cbffae22e8a48d259119c59aa435252477ba3b4f4522cc00c90d9a242bd5ac76e8d8210bd032b8f78538e5f95606fe2c862ffd7477acdfb6e1a7 SHA512 c008aa50e17db6a0134fb85235a958258d345410f5063bc77175f7c28b2e35895427b9e68cd1ac9acb769769c83313cd59fe6465b453e891cf415a2514b7722d
 DIST rust-1.49.0-x86_64-unknown-linux-musl.tar.xz 217795696 BLAKE2B 264348951db96a9f046e4bec599b92a5ee6d185d961f833f8d2127c1ac4578b91401834d09b5eed421f03d14933ff3b2e85961ff09927d19bf6c701d80eb1b67 SHA512 be165de42e3acd50f6e6a21fe386ea2333fd0f19abedbb059d6eb8ce8c80a8e79257eab8a7775e3b72307596b52e803bd8c4c46330a6e66acbadbe2f63cea42a
+DIST rust-1.50.0-aarch64-unknown-linux-gnu.tar.xz 203382140 BLAKE2B c9547661356bfb2eb328992ecbfd488114bc68c00e551cbbeb925fd1650b5a4c0ab33145c6e994184766ef5046cc2881eb0009ac9d9448208cf896317bf47c63 SHA512 e6b409afc8e85a88ecb9ff439a6eb9dcb93d5553e81549fb4f332b9e2d946dce0424319c5092e60aab9435944af70d0117d15c12d54d2059ef73c1fdf36d8273
+DIST rust-1.50.0-arm-unknown-linux-gnueabi.tar.xz 193322872 BLAKE2B 2654e604a609f287b2722bbcac325461cc8a84d47e449470da1925f3d21a042d665e55d07f4f268e37630184998ed330b2c2e315485ebeee960c63555550c9cd SHA512 eb3aefa4ff7d2b832a847b6d4fd4427d88885cc72c3a9f97837e2516d202af39da7d523de2d1578fde20aeb76e843a84c37b4ba33f85668caa0b28d63a20968a
+DIST rust-1.50.0-arm-unknown-linux-gnueabihf.tar.xz 191287452 BLAKE2B 34958b97d034f6c643036c61d64e25aaedf1c93046ca039e39c9083a54d030d715d17a3174bd69bdad3f9bdb8b89c9b92f977b7d3c29da4eb28efe933402e86b SHA512 7b1f61fd53fbb361fc6b3ee603917f899f3cfc8062df3cadb0751e8014e1e2633f32ba198912e8bca34102543c427f2607e861b724143d60fd1f9682578be70d
+DIST rust-1.50.0-armv7-unknown-linux-gnueabihf.tar.xz 194656336 BLAKE2B d02323d9f47d380f4a06e8273b02ac3c9091257400a59b3efd1140ef22aa3bcbb71b4c5e70aaeb2cd118839a84b3513d9c85ff8020b5a1f6e68791ae5d81b8f3 SHA512 c3314436afc4ebed697bf6828b9eacbc12f96838b156241331a3b71e99e1438f8ad82e701615ea302ebfc459464479442fe653232bd319cf824027362438970d
+DIST rust-1.50.0-i686-unknown-linux-gnu.tar.xz 222946404 BLAKE2B 38801f395ab8f5aeee1cb709cd7fda6b6573476f9d763931086c76b0064ec0d5dff03415bc2f6f13419fb1a326cb44a0086dd42db99d1e14d520b33c6382e340 SHA512 bff117733d11731f56e8659265d0b47327e2af3f7c46aca494747a92b4f634dd35fa9731a1be59dd69821042f88bded253e1d7b5693ca237c9a167408ca7f898
+DIST rust-1.50.0-mips-unknown-linux-gnu.tar.xz 150524936 BLAKE2B 950424444394dd55fd81c6b850798552166d78588fcc2c4dfdd4bbc900600957eed06c4a03c83713f2f820252949f57651d69e4d2a2b78d7de42fd7e0c0404f4 SHA512 849d70b5f4b4364070c5f708e466a86afead7d82d7fde4d1ef7c8800bc1ebcafdd4e1bc69f059e393fd8fce104f2d97201f09ecb3b894676e6ff6db9c949c897
+DIST rust-1.50.0-mips64-unknown-linux-gnuabi64.tar.xz 159792596 BLAKE2B a361c13c036d7cc964ace781c34ed815946c976071d38d361110856e889174e2629ad9602dde5f6d5a704044cab670687b67643470b199ee18e95944dbccba16 SHA512 d85c2abff3249ccca63d14abfa85f5320e5d227b17faf7b4b47a5254a4b8ee3a4cf3ccb84e31f13dae7780176411e2a5d04894e2422ae5921f547cc5e07fd1b9
+DIST rust-1.50.0-mipsel-unknown-linux-gnu.tar.xz 156597932 BLAKE2B 57bf7d105f6f9d3a50904466439e88e32c99b5fd85f220ef48e82fe91b2c05c28d6783233dd3e9ba7b49e79eeeb358cd1df60369bbd927a9a867a0bdaed471c7 SHA512 019df8180520bc4fd29a258017e2477a59a30338d921f185871f64aa81d8b5499e88676d09d5887f9c6726824ae4bf50f8a9e6fae1f03e9e728f0f08ab0271c4
+DIST rust-1.50.0-powerpc-unknown-linux-gnu.tar.xz 168133824 BLAKE2B d2ce955ae8975d667c854fc1f8dab5de8b8a3ecf08e52dab57f40f5a036138b6006554f053616c7d369e054f9ba3dbc502b2fa47ff0463e077f831f75b831c4f SHA512 1411063401432b2aed58f53c7e9c87d70177cb7745753378df052676a6b0ee19bf7e56298584356b77707758ad531e5d4d59140cd6e686bd7cee53488553214a
+DIST rust-1.50.0-powerpc64-unknown-linux-gnu.tar.xz 180157804 BLAKE2B 8d3c38cdea4901f38665e66f880301c409d0de4ade5fd931c834680ee21d014fe6efb6928a417bcc747ac10ceeabccf287c0a29c009525e2d2fec92db60bad01 SHA512 d60fa7d029c52403c08722b4cdda8ebcfbbf23f57770db786007b21c8e0590577f58823b8e0b89adb38c351102b6aba0c02afa5c3582eecec5165bccb50b4944
+DIST rust-1.50.0-powerpc64le-unknown-linux-gnu.tar.xz 189754060 BLAKE2B 8579349a7d916ee701f29bd66d08a76d8433ad86020571e5484edbc8d9a984088e6942e31b18179698a199ade2fcee3b1b9aed1cc0d5a3b996e763ef2b8e0b33 SHA512 e3dc75ba7dff3a358042542afa398ec8771a23f5f699454a876ddc1f3583d399fe5350696a5da62d71ca97ea882c9ae1fcb60dc2e9fdf76bc7a9af892096371e
+DIST rust-1.50.0-s390x-unknown-linux-gnu.tar.xz 190157972 BLAKE2B 4fe8ec73293815ade006e2c383d1a6d541d87d4ebba76b3ace65793f7debfd54d3dc07cac89c43e41947f8d0b69bd0f213dbdca8173f610ca2da03bccdd55ddd SHA512 733513af2a7ef7a782a5ebfbd080071194ac47084022b54b4830de84facef9986d65525f8666a4c226e9878e43b00ebced26d6077e5fb1b7f775ac8f290fba97
+DIST rust-1.50.0-x86_64-unknown-linux-gnu.tar.xz 152873328 BLAKE2B b0bb91487186f13a7a1a49edeac28bc347c300911f574aba0e70c37e05b688176f5941c97cc4ad0ceddf32f2fbc0bdda6f8a1fdfa482aeb9682ea1fade28206e SHA512 ab49e3ecb14e4af8e48548845184e9ab3d564ab2341c1e5462b7847347c79d13324211b860988d219ccb646143bf142fb14c3ab03663b06cfe9ca275128d9fa0
+DIST rust-1.50.0-x86_64-unknown-linux-musl.tar.xz 242743828 BLAKE2B f20feb709cc07ad43f69e30a7fcefa81b5de94ee4c90cbce2616fcda8af2591a27cfa0770b71138762e21f6e07263bf3c2548bcce1b707831ab544de12ab746a SHA512 68403236e213a4f2c156b36a03ca4dd7866fdb69e87170efc76426d937dcf5cf2c5578aaf73483131b1ce7750302f9d02de1bcbc52e1283b08220d5b22be82ca
 DIST rustc-1.46.0-src.tar.xz 101868452 BLAKE2B da9798596b124a10d79c236a871228f05e5f571d22c2259328e7026c91e088c85f5de9c0536a16531e0cb10477bfcd16d3ac11467979f5561cb6199442b877ef SHA512 099857f1d295043587a4e2a65ef3e6a90e12c8b6958e98535a1656c113c553f9a9b621aba8a19cf21bd8d2c79d27cbfa4b8e6fabbcb3cbfee23b545be7b450b4
 DIST rustc-1.47.0-src.tar.xz 104143736 BLAKE2B 0454094dde35275488046826da87655e51bf0795481d6d08fd70d644bfc12481bca8641166106ef32f20494906025244715b16ff21a1c023f4bd2818aab42521 SHA512 6ba83c0158f8130ddeae7e070417a2121d8a548c8fe97e28bce116d84048636c75aaee78e0c92cd43a50f5679a1223fc226cc8c5ba9bbd1465e84c5c6034d5c9
 DIST rustc-1.48.0-src.tar.xz 105951736 BLAKE2B 42468fc5ac5e80c4793cfe0913cbb8e43a8def28cc8cf5ed25ab989561e2bf33e155c83e180183362535cbc9008f341eb1273087a2364672b1a4032ac2d6ca45 SHA512 4e12baa6893238a8d336ec9ebe891477d18676f271b32763474fa7a6a8b58fb3187dd4e2aa95bce482989b692cc2e1360221669d6811eec71b326f22a1756c23
 DIST rustc-1.49.0-src.tar.xz 108330280 BLAKE2B 65e36253482ded2df225cbbf15253b6c9a8ae935053b071d9fb9e7b1d47d5d3ac47a138876e4a5cfeda455c655ac06ceff2658c8668cef7d2206116906740653 SHA512 fd8bc67ec0a73d3b6bf9c1fabb7ea981ef817644b4e6ced982fa90b12eae9b55de074634a670bdfb38bfee6588603e818ddcbcc2f2a05f83057c061b4194b4b7
 DIST rustc-1.50.0-src.tar.xz 108666272 BLAKE2B abb1b6f57093334bae5892dd99c964ffaf5e2b906cc92f0b92d5786cf80484cff923643169f24f4f92a5724c21b8bd671c72531c2cd1f6fbe0ea7107b5bd923b SHA512 df3c83c0fdc9ebce6fdccddda781dea0cdbd88d2b2a8220cac40cc3a8fa957923ae834d1fa45283d4ad227b334bd9e220e37a4a1ad7a1c7aeb806ed9ed387245
+DIST rustc-1.51.0-src.tar.xz 109596164 BLAKE2B c1ac89655adfe7db8005476d42c748cf1896f52888141229fd6dda43855dbb08c21c8e1f11398d2f1f9dd5f8d508d9158a3bda4f1b282d1b184ea4c701100837 SHA512 ded91468ddf3e6627f00e7ec3d44452aa24eb727a183c0de9d90264f593119a54300d56b09251a88260db480b48554181ae195c538996a32d68d48b6587ac0df
diff --git a/dev-lang/rust/rust-1.51.0.ebuild b/dev-lang/rust/rust-1.51.0.ebuild
new file mode 100644
index 000000000000..630a170abe58
--- /dev/null
+++ b/dev-lang/rust/rust-1.51.0.ebuild
@@ -0,0 +1,616 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{7..9} )
+
+inherit bash-completion-r1 check-reqs estack flag-o-matic llvm multiprocessing multilib-build python-any-r1 rust-toolchain toolchain-funcs
+
+if [[ ${PV} = *beta* ]]; then
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	MY_P="rustc-beta"
+	SLOT="beta/${PV}"
+	SRC="${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz"
+else
+	ABI_VER="$(ver_cut 1-2)"
+	SLOT="stable/${ABI_VER}"
+	MY_P="rustc-${PV}"
+	SRC="${MY_P}-src.tar.xz"
+	KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~x86"
+fi
+
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).0"
+
+DESCRIPTION="Systems programming language from Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+SRC_URI="
+	https://static.rust-lang.org/dist/${SRC}
+	!system-bootstrap? ( $(rust_all_arch_uris rust-${RUST_STAGE0_VERSION}) )
+"
+
+# keep in sync with llvm ebuild of the same version as bundled one.
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM AVR BPF Hexagon Lanai Mips MSP430
+	NVPTX PowerPC RISCV Sparc SystemZ WebAssembly X86 XCore )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/?}
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4 UoI-NCSA"
+
+IUSE="clippy cpu_flags_x86_sse2 debug doc libressl miri nightly parallel-compiler rls rustfmt system-bootstrap system-llvm test wasm ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling more than one slot
+# simultaneously.
+
+# How to use it:
+# 1. List all the working slots (with min versions) in ||, newest first.
+# 2. Update the := to specify *max* version, e.g. < 12.
+# 3. Specify LLVM_MAX_SLOT, e.g. 11.
+LLVM_DEPEND="
+	|| (
+		sys-devel/llvm:11[${LLVM_TARGET_USEDEPS// /,}]
+	)
+	<sys-devel/llvm-12:=
+	wasm? ( sys-devel/lld )
+"
+LLVM_MAX_SLOT=11
+
+# to bootstrap we need at least exactly previous version, or same.
+# most of the time previous versions fail to bootstrap with newer
+# for example 1.47.x, requires at least 1.46.x, 1.47.x is ok,
+# but it fails to bootstrap with 1.48.x
+# https://github.com/rust-lang/rust/blob/${PV}/src/stage0.txt
+BOOTSTRAP_DEPEND="||
+	(
+		=dev-lang/rust-$(ver_cut 1).$(($(ver_cut 2) - 1))*
+		=dev-lang/rust-bin-$(ver_cut 1).$(($(ver_cut 2) - 1))*
+		=dev-lang/rust-$(ver_cut 1).$(ver_cut 2)*
+		=dev-lang/rust-bin-$(ver_cut 1).$(ver_cut 2)*
+	)
+"
+
+BDEPEND="${PYTHON_DEPS}
+	app-eselect/eselect-rust
+	|| (
+		>=sys-devel/gcc-4.7
+		>=sys-devel/clang-3.5
+	)
+	system-bootstrap? ( ${BOOTSTRAP_DEPEND} )
+	!system-llvm? (
+		dev-util/cmake
+		dev-util/ninja
+	)
+"
+
+DEPEND="
+	>=app-arch/xz-utils-5.2
+	net-misc/curl:=[http2,ssl]
+	sys-libs/zlib:=
+	!libressl? ( dev-libs/openssl:0= )
+	libressl? ( dev-libs/libressl:0= )
+	elibc_musl? ( sys-libs/libunwind:= )
+	system-llvm? (
+		${LLVM_DEPEND}
+	)
+"
+
+# we need to block older versions due to layout changes.
+RDEPEND="${DEPEND}
+	app-eselect/eselect-rust
+	!<dev-lang/rust-1.47.0-r1
+	!<dev-lang/rust-bin-1.47.0-r1
+"
+
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+	miri? ( nightly )
+	parallel-compiler? ( nightly )
+	test? ( ${ALL_LLVM_TARGETS[*]} )
+	wasm? ( llvm_targets_WebAssembly )
+	x86? ( cpu_flags_x86_sse2 )
+"
+
+# we don't use cmake.eclass, but can get a warnings
+CMAKE_WARN_UNUSED_CLI=no
+
+QA_FLAGS_IGNORED="
+	usr/lib/${PN}/${PV}/bin/.*
+	usr/lib/${PN}/${PV}/libexec/.*
+	usr/lib/${PN}/${PV}/lib/lib.*.so
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/bin/.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+QA_SONAME="
+	usr/lib/${PN}/${PV}/lib/lib.*.so.*
+	usr/lib/${PN}/${PV}/lib/rustlib/.*/lib/lib.*.so
+"
+
+# causes double bootstrap
+RESTRICT="test"
+
+PATCHES=(
+	"${FILESDIR}"/1.47.0-libressl.patch
+	"${FILESDIR}"/1.47.0-ignore-broken-and-non-applicable-tests.patch
+	"${FILESDIR}"/1.49.0-gentoo-musl-target-specs.patch
+)
+
+S="${WORKDIR}/${MY_P}-src"
+
+toml_usex() {
+	usex "${1}" true false
+}
+
+boostrap_rust_version_check() {
+	# never call from pkg_pretend. eselect-rust may be not installed yet.
+	[[ ${MERGE_TYPE} == binary ]] && return
+	local rustc_wanted="$(ver_cut 1).$(($(ver_cut 2) - 1))"
+	local rustc_toonew="$(ver_cut 1).$(($(ver_cut 2) + 1))"
+	local rustc_version=( $(eselect --brief rust show 2>/dev/null) )
+	rustc_version=${rustc_version[0]#rust-bin-}
+	rustc_version=${rustc_version#rust-}
+
+	[[ -z "${rustc_version}" ]] && die "Failed to determine rust version, check 'eselect rust' output"
+
+	if ver_test "${rustc_version}" -lt "${rustc_wanted}" ; then
+		eerror "Rust >=${rustc_wanted} is required"
+		eerror "please run 'eselect rust' and set correct rust version"
+		die "selected rust version is too old"
+	elif ver_test "${rustc_version}" -ge "${rustc_toonew}" ; then
+		eerror "Rust <${rustc_toonew} is required"
+		eerror "please run 'eselect rust' and set correct rust version"
+		die "selected rust version is too new"
+	else
+		einfo "Using rust ${rustc_version} to build"
+	fi
+}
+
+pre_build_checks() {
+	local M=6144
+	M=$(( $(usex clippy 128 0) + ${M} ))
+	M=$(( $(usex miri 128 0) + ${M} ))
+	M=$(( $(usex rls 512 0) + ${M} ))
+	M=$(( $(usex rustfmt 256 0) + ${M} ))
+	M=$(( $(usex system-llvm 0 2048) + ${M} ))
+	M=$(( $(usex wasm 256 0) + ${M} ))
+	M=$(( $(usex debug 15 10) * ${M} / 10 ))
+	eshopts_push -s extglob
+	if is-flagq '-g?(gdb)?([1-9])'; then
+		M=$(( 15 * ${M} / 10 ))
+	fi
+	eshopts_pop
+	M=$(( $(usex system-bootstrap 0 1024) + ${M} ))
+	M=$(( $(usex doc 256 0) + ${M} ))
+	CHECKREQS_DISK_BUILD=${M}M check-reqs_pkg_${EBUILD_PHASE}
+}
+
+pkg_pretend() {
+	pre_build_checks
+}
+
+pkg_setup() {
+	pre_build_checks
+	python-any-r1_pkg_setup
+
+	export LIBGIT2_NO_PKG_CONFIG=1 #749381
+
+	use system-bootstrap && boostrap_rust_version_check
+
+	if use system-llvm; then
+		llvm_pkg_setup
+
+		local llvm_config="$(get_llvm_prefix "$LLVM_MAX_SLOT")/bin/llvm-config"
+		export LLVM_LINK_SHARED=1
+		export RUSTFLAGS="${RUSTFLAGS} -Lnative=$("${llvm_config}" --libdir)"
+	fi
+}
+
+src_prepare() {
+	if ! use system-bootstrap; then
+		local rust_stage0_root="${WORKDIR}"/rust-stage0
+		local rust_stage0="rust-${RUST_STAGE0_VERSION}-$(rust_abi)"
+
+		"${WORKDIR}/${rust_stage0}"/install.sh --disable-ldconfig \
+			--destdir="${rust_stage0_root}" --prefix=/ || die
+	fi
+
+	default
+}
+
+src_configure() {
+	local rust_target="" rust_targets="" arch_cflags
+
+	# Collect rust target names to compile standard libs for all ABIs.
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_targets="${rust_targets},\"$(rust_abi $(get_abi_CHOST ${v##*.}))\""
+	done
+	if use wasm; then
+		rust_targets="${rust_targets},\"wasm32-unknown-unknown\""
+		if use system-llvm; then
+			# un-hardcode rust-lld linker for this target
+			# https://bugs.gentoo.org/715348
+			sed -i '/linker:/ s/rust-lld/wasm-ld/' compiler/rustc_target/src/spec/wasm32_base.rs || die
+		fi
+	fi
+	rust_targets="${rust_targets#,}"
+
+	local tools="\"cargo\","
+	if use clippy; then
+		tools="\"clippy\",$tools"
+	fi
+	if use miri; then
+		tools="\"miri\",$tools"
+	fi
+	if use rls; then
+		tools="\"rls\",\"analysis\",\"src\",$tools"
+	fi
+	if use rustfmt; then
+		tools="\"rustfmt\",$tools"
+	fi
+
+	local rust_stage0_root
+	if use system-bootstrap; then
+		rust_stage0_root="$(rustc --print sysroot)"
+	else
+		rust_stage0_root="${WORKDIR}"/rust-stage0
+	fi
+
+	rust_target="$(rust_abi)"
+
+	cat <<- _EOF_ > "${S}"/config.toml
+		[llvm]
+		download-ci-llvm = false
+		optimize = $(toml_usex !debug)
+		release-debuginfo = $(toml_usex debug)
+		assertions = $(toml_usex debug)
+		ninja = true
+		targets = "${LLVM_TARGETS// /;}"
+		experimental-targets = ""
+		link-shared = $(toml_usex system-llvm)
+		[build]
+		build = "${rust_target}"
+		host = ["${rust_target}"]
+		target = [${rust_targets}]
+		cargo = "${rust_stage0_root}/bin/cargo"
+		rustc = "${rust_stage0_root}/bin/rustc"
+		docs = $(toml_usex doc)
+		compiler-docs = $(toml_usex doc)
+		submodules = false
+		python = "${EPYTHON}"
+		locked-deps = true
+		vendor = true
+		extended = true
+		tools = [${tools}]
+		verbose = 2
+		sanitizers = false
+		profiler = false
+		cargo-native-static = false
+		[install]
+		prefix = "${EPREFIX}/usr/lib/${PN}/${PV}"
+		sysconfdir = "etc"
+		docdir = "share/doc/rust"
+		bindir = "bin"
+		libdir = "lib"
+		mandir = "share/man"
+		[rust]
+		# https://github.com/rust-lang/rust/issues/54872
+		codegen-units-std = 1
+		optimize = true
+		debug = $(toml_usex debug)
+		debug-assertions = $(toml_usex debug)
+		debuginfo-level-rustc = 0
+		backtrace = true
+		incremental = false
+		default-linker = "$(tc-getCC)"
+		parallel-compiler = $(toml_usex parallel-compiler)
+		channel = "$(usex nightly nightly stable)"
+		description = "gentoo"
+		rpath = false
+		verbose-tests = true
+		optimize-tests = $(toml_usex !debug)
+		codegen-tests = true
+		dist-src = false
+		remap-debuginfo = true
+		lld = $(usex system-llvm false $(toml_usex wasm))
+		backtrace-on-ice = true
+		jemalloc = false
+		[dist]
+		src-tarball = false
+	_EOF_
+
+	for v in $(multilib_get_enabled_abi_pairs); do
+		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
+		arch_cflags="$(get_abi_CFLAGS ${v##*.})"
+
+		cat <<- _EOF_ >> "${S}"/config.env
+			CFLAGS_${rust_target}=${arch_cflags}
+		_EOF_
+
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.${rust_target}]
+			cc = "$(tc-getBUILD_CC)"
+			cxx = "$(tc-getBUILD_CXX)"
+			linker = "$(tc-getCC)"
+			ar = "$(tc-getAR)"
+		_EOF_
+		# librustc_target/spec/linux_musl_base.rs sets base.crt_static_default = true;
+		if use elibc_musl; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				crt-static = false
+			_EOF_
+		fi
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+			_EOF_
+		fi
+	done
+	if use wasm; then
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.wasm32-unknown-unknown]
+			linker = "$(usex system-llvm lld rust-lld)"
+		_EOF_
+	fi
+
+	if [[ -n ${I_KNOW_WHAT_I_AM_DOING_CROSS} ]]; then # whitespace intentionally shifted below
+	# experimental cross support
+	# discussion: https://bugs.gentoo.org/679878
+	# TODO: c*flags, clang, system-llvm, cargo.eclass target support
+	# it would be much better if we could split out stdlib
+	# complilation to separate ebuild and abuse CATEGORY to
+	# just install to /usr/lib/rustlib/<target>
+
+	# extra targets defined as a bash array
+	# spec format:  <LLVM target>:<rust-target>:<CTARGET>
+	# best place would be /etc/portage/env/dev-lang/rust
+	# Example:
+	# RUST_CROSS_TARGETS=(
+	#	"AArch64:aarch64-unknown-linux-gnu:aarch64-unknown-linux-gnu"
+	# )
+	# no extra hand holding is done, no target transformations, all
+	# values are passed as-is with just basic checks, so it's up to user to supply correct values
+	# valid rust targets can be obtained with
+	# 	rustc --print target-list
+	# matching cross toolchain has to be installed
+	# matching LLVM_TARGET has to be enabled for both rust and llvm (if using system one)
+	# only gcc toolchains installed with crossdev are checked for now.
+
+	# BUG: we can't pass host flags to cross compiler, so just filter for now
+	# BUG: this should be more fine-grained.
+	filter-flags '-mcpu=*' '-march=*' '-mtune=*'
+
+	local cross_target_spec
+	for cross_target_spec in "${RUST_CROSS_TARGETS[@]}";do
+		# extracts first element form <LLVM target>:<rust-target>:<CTARGET>
+		local cross_llvm_target="${cross_target_spec%%:*}"
+		# extracts toolchain triples, <rust-target>:<CTARGET>
+		local cross_triples="${cross_target_spec#*:}"
+		# extracts first element after before : separator
+		local cross_rust_target="${cross_triples%%:*}"
+		# extracts last element after : separator
+		local cross_toolchain="${cross_triples##*:}"
+		use llvm_targets_${cross_llvm_target} || die "need llvm_targets_${cross_llvm_target} target enabled"
+		command -v ${cross_toolchain}-gcc > /dev/null 2>&1 || die "need ${cross_toolchain} cross toolchain"
+
+		cat <<- _EOF_ >> "${S}"/config.toml
+			[target.${cross_rust_target}]
+			cc = "${cross_toolchain}-gcc"
+			cxx = "${cross_toolchain}-g++"
+			linker = "${cross_toolchain}-gcc"
+			ar = "${cross_toolchain}-ar"
+		_EOF_
+		if use system-llvm; then
+			cat <<- _EOF_ >> "${S}"/config.toml
+				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+			_EOF_
+		fi
+
+		# append cross target to "normal" target list
+		# example 'target = ["powerpc64le-unknown-linux-gnu"]'
+		# becomes 'target = ["powerpc64le-unknown-linux-gnu","aarch64-unknown-linux-gnu"]'
+
+		rust_targets="${rust_targets},\"${cross_rust_target}\""
+		sed -i "/^target = \[/ s#\[.*\]#\[${rust_targets}\]#" config.toml || die
+
+		ewarn
+		ewarn "Enabled ${cross_rust_target} rust target"
+		ewarn "Using ${cross_toolchain} cross toolchain"
+		ewarn
+		if ! has_version -b 'sys-devel/binutils[multitarget]' ; then
+			ewarn "'sys-devel/binutils[multitarget]' is not installed"
+			ewarn "'strip' will be unable to strip cross libraries"
+			ewarn "cross targets will be installed with full debug information"
+			ewarn "enable 'multitarget' USE flag for binutils to be able to strip object files"
+			ewarn
+			ewarn "Alternatively llvm-strip can be used, it supports stripping any target"
+			ewarn "define STRIP=\"llvm-strip\" to use it (experimental)"
+			ewarn
+		fi
+	done
+	fi # I_KNOW_WHAT_I_AM_DOING_CROSS
+
+	einfo "Rust configured with the following settings:"
+	cat "${S}"/config.toml || die
+}
+
+src_compile() {
+	# we need \n IFS to have config.env with spaces loaded properly. #734018
+	(
+	IFS=$'\n'
+	env $(cat "${S}"/config.env) RUST_BACKTRACE=1\
+		"${EPYTHON}" ./x.py dist -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+	)
+}
+
+src_test() {
+	# https://rustc-dev-guide.rust-lang.org/tests/intro.html
+
+	# those are basic and codegen tests.
+	local tests=(
+		codegen
+		codegen-units
+		compile-fail
+		incremental
+		mir-opt
+		pretty
+		run-make
+	)
+
+	# fails if llvm is not built with ALL targets.
+	# and known to fail with system llvm sometimes.
+	use system-llvm || tests+=( assembly )
+
+	# fragile/expensive/less important tests
+	# or tests that require extra builds
+	# TODO: instead of skipping, just make some nonfatal.
+	if [[ ${ERUST_RUN_EXTRA_TESTS:-no} != no ]]; then
+		tests+=(
+			rustdoc
+			rustdoc-js
+			rustdoc-js-std
+			rustdoc-ui
+			run-make-fulldeps
+			ui
+			ui-fulldeps
+		)
+	fi
+
+	local i failed=()
+	einfo "rust_src_test: enabled tests ${tests[@]/#/src/test/}"
+	for i in "${tests[@]}"; do
+		local t="src/test/${i}"
+		einfo "rust_src_test: running ${t}"
+		if ! (
+				IFS=$'\n'
+				env $(cat "${S}"/config.env) RUST_BACKTRACE=1 \
+				"${EPYTHON}" ./x.py test -vv --config="${S}"/config.toml \
+				-j$(makeopts_jobs) --no-doc --no-fail-fast "${t}"
+			)
+		then
+				failed+=( "${t}" )
+				eerror "rust_src_test: ${t} failed"
+		fi
+	done
+
+	if [[ ${#failed[@]} -ne 0 ]]; then
+		eerror "rust_src_test: failure summary: ${failed[@]}"
+		die "aborting due to test failures"
+	fi
+}
+
+src_install() {
+	(
+	IFS=$'\n'
+	env $(cat "${S}"/config.env) DESTDIR="${D}" \
+		"${EPYTHON}" ./x.py install -vv --config="${S}"/config.toml || die
+	)
+
+	# bug #689562, #689160
+	rm -v "${ED}/usr/lib/${PN}/${PV}/etc/bash_completion.d/cargo" || die
+	rmdir -v "${ED}/usr/lib/${PN}/${PV}"/etc{/bash_completion.d,} || die
+	newbashcomp src/tools/cargo/src/etc/cargo.bashcomp.sh cargo
+
+	local symlinks=(
+		cargo
+		rustc
+		rustdoc
+		rust-gdb
+		rust-gdbgui
+		rust-lldb
+	)
+
+	use clippy && symlinks+=( clippy-driver cargo-clippy )
+	use miri && symlinks+=( miri cargo-miri )
+	use rls && symlinks+=( rls )
+	use rustfmt && symlinks+=( rustfmt cargo-fmt )
+
+	einfo "installing eselect-rust symlinks and paths: ${symlinks[@]}"
+	local i
+	for i in "${symlinks[@]}"; do
+		# we need realpath on /usr/bin/* symlink return version-appended binary path.
+		# so /usr/bin/rustc should point to /usr/lib/rust/<ver>/bin/rustc-<ver>
+		# need to fix eselect-rust to remove this hack.
+		local ver_i="${i}-${PV}"
+		if [[ -f "${ED}/usr/lib/${PN}/${PV}/bin/${i}" ]]; then
+			einfo "Installing ${i} symlink"
+			ln -v "${ED}/usr/lib/${PN}/${PV}/bin/${i}" "${ED}/usr/lib/${PN}/${PV}/bin/${ver_i}" || die
+		else
+			ewarn "${i} symlink requested, but source file not found"
+			ewarn "please report this"
+		fi
+		dosym "../lib/${PN}/${PV}/bin/${ver_i}" "/usr/bin/${ver_i}"
+	done
+
+	# symlinks to switch components to active rust in eselect
+	dosym "${PV}/lib" "/usr/lib/${PN}/lib-${PV}"
+	dosym "${PV}/libexec" "/usr/lib/${PN}/libexec-${PV}"
+	dosym "${PV}/share/man" "/usr/lib/${PN}/man-${PV}"
+	dosym "rust/${PV}/lib/rustlib" "/usr/lib/rustlib-${PV}"
+	dosym "../../lib/${PN}/${PV}/share/doc/rust" "/usr/share/doc/${P}"
+
+	newenvd - "50${P}" <<-_EOF_
+		LDPATH="${EPREFIX}/usr/lib/rust/lib"
+		MANPATH="${EPREFIX}/usr/lib/rust/man"
+		$(use amd64 && usex elibc_musl 'CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-C target-feature=-crt-static"' '')
+		$(use arm64 && usex elibc_musl 'CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-C target-feature=-crt-static"' '')
+	_EOF_
+
+	rm -rf "${ED}/usr/lib/${PN}/${PV}"/*.old || die
+	rm -rf "${ED}/usr/lib/${PN}/${PV}/doc"/*.old || die
+
+	# note: eselect-rust adds EROOT to all paths below
+	cat <<-_EOF_ > "${T}/provider-${P}"
+		/usr/bin/cargo
+		/usr/bin/rustdoc
+		/usr/bin/rust-gdb
+		/usr/bin/rust-gdbgui
+		/usr/bin/rust-lldb
+		/usr/lib/rustlib
+		/usr/lib/rust/lib
+		/usr/lib/rust/libexec
+		/usr/lib/rust/man
+		/usr/share/doc/rust
+	_EOF_
+
+	if use clippy; then
+		echo /usr/bin/clippy-driver >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-clippy >> "${T}/provider-${P}"
+	fi
+	if use miri; then
+		echo /usr/bin/miri >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-miri >> "${T}/provider-${P}"
+	fi
+	if use rls; then
+		echo /usr/bin/rls >> "${T}/provider-${P}"
+	fi
+	if use rustfmt; then
+		echo /usr/bin/rustfmt >> "${T}/provider-${P}"
+		echo /usr/bin/cargo-fmt >> "${T}/provider-${P}"
+	fi
+
+	insinto /etc/env.d/rust
+	doins "${T}/provider-${P}"
+}
+
+pkg_postinst() {
+	eselect rust update
+
+	if has_version sys-devel/gdb || has_version dev-util/lldb; then
+		elog "Rust installs a helper script for calling GDB and LLDB,"
+		elog "for your convenience it is installed under /usr/bin/rust-{gdb,lldb}-${PV}."
+	fi
+
+	if has_version app-editors/emacs; then
+		elog "install app-emacs/rust-mode to get emacs support for rust."
+	fi
+
+	if has_version app-editors/gvim || has_version app-editors/vim; then
+		elog "install app-vim/rust-vim to get vim support for rust."
+	fi
+}
+
+pkg_postrm() {
+	eselect rust cleanup
+}