[gentoo-commits] repo/gentoo:master commit in: dev-lang/rust/

[Georgy Yakovlev]

commit:     d4e6ca7891bdea48a8214f8ca2a675ce00c65604
Author:     Georgy Yakovlev <gyakovlev <AT> gentoo <DOT> org>
AuthorDate: Mon Aug  3 20:08:15 2020 +0000
Commit:     Georgy Yakovlev <gyakovlev <AT> gentoo <DOT> org>
CommitDate: Mon Aug  3 20:11:39 2020 +0000
URL:        https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=d4e6ca78

dev-lang/rust: bump to 1.45.2

Install rustlib to versioned subdirectory in /usr/lib* again

Bug: https://bugs.gentoo.org/703744
Bug: https://bugs.gentoo.org/683420
Package-Manager: Portage-3.0.1, Repoman-2.3.23
Signed-off-by: Georgy Yakovlev <gyakovlev <AT> gentoo.org>

 dev-lang/rust/Manifest           |   1 +
 dev-lang/rust/rust-1.45.2.ebuild | 521 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 522 insertions(+)

diff --git a/dev-lang/rust/Manifest b/dev-lang/rust/Manifest
index 850e643071c..a043cedde16 100644
--- a/dev-lang/rust/Manifest
+++ b/dev-lang/rust/Manifest
@@ -29,3 +29,4 @@ DIST rust-1.44.1-x86_64-unknown-linux-musl.tar.xz 117456616 BLAKE2B fd2752cf867e
 DIST rustc-1.44.1-src.tar.xz 94756856 BLAKE2B 60f536c3ba0fa1fec4b6333ee57809ee5226090ad5041c14a136b4356ff3b898062e06c3fe54effe873e27931ac8fcb902cd48a38615a8de7eebc6ecb3bdc2bd SHA512 1c17002edae844a710db9b144c17171416330dc565343c65af8a6e112fb61555e2025bb4cf33cac1229d7df689e6ff8858b91ae00552400ccacafaf1de11849b
 DIST rustc-1.45.0-src.tar.xz 98677856 BLAKE2B 2558ba9444a53268de4f1604f13e701077a27e9480c97732a30706d656682672c17f87d8c015da3b839ed3b38081ef8d132bbab3522911bf9b50f018367e6ec7 SHA512 ff049eb65b36e6c64531d56251ebd446336a782f26504eccf375df1c22fa94b5f18e84660cef423edb815c1b31a1a7c9e57aea4aa0779576f3b0d7e81e19427b
 DIST rustc-1.45.1-src.tar.xz 98686408 BLAKE2B 49eec97cccc9932915877cf28cc6b27b8008d5fecc2c6255d8974d9ee52375b95933d0052fad23ed2e60f4f08fcc305e1ca47239e8f5adaa8a3acb62eb2c1e14 SHA512 ef71a1706c84fa8557f481d310033285a41ecd9b8d537bacb846d01ed9954b679b915272db57cd96d5ee097cc0134899e584d517c467a9d2949496312e5995df
+DIST rustc-1.45.2-src.tar.xz 98683036 BLAKE2B a4102a5d4744b7ccc9b076aba00c39d69532f777e7d39e0e4ce2033b663b43e27b55034fdb3a1e13379fae9a16bff9e7748865a84507f7388ef0ebf9d421eac7 SHA512 cc6250c0bc844e77ca6dd7ae013e434ed3009b001914114866ed31f28edf3960221454d131e298b15050e3b8153fb8298d509559c2f7307c64611aa8e36b4d25

diff --git a/dev-lang/rust/rust-1.45.2.ebuild b/dev-lang/rust/rust-1.45.2.ebuild
new file mode 100644
index 00000000000..45231ffd902
--- /dev/null
+++ b/dev-lang/rust/rust-1.45.2.ebuild
@@ -0,0 +1,521 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{6,7,8} )
+
+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="${BETA_SNAPSHOT}/rustc-beta-src.tar.xz"
+else
+	ABI_VER="$(ver_cut 1-2)"
+	SLOT="stable/${ABI_VER}"
+	MY_P="rustc-${PV}"
+	SRC="${MY_P}-src.tar.xz"
+	KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~x86"
+fi
+
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).1"
+
+DESCRIPTION="Systems programming language from Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+SRC_URI="
+	https://static.rust-lang.org/dist/${SRC} -> rustc-${PV}-src.tar.xz
+	!system-bootstrap? ( $(rust_all_arch_uris rust-${RUST_STAGE0_VERSION}) )
+"
+
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM 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 wasm ${ALL_LLVM_TARGETS[*]}"
+
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling more than one slot
+# simultaneously.
+
+# How to use it:
+# 1. List all the working slots (with min versions) in ||, newest first.
+# 2. Update the := to specify *max* version, e.g. < 11.
+# 3. Specify LLVM_MAX_SLOT, e.g. 10.
+LLVM_DEPEND="
+	|| (
+		sys-devel/llvm:10[${LLVM_TARGET_USEDEPS// /,}]
+		sys-devel/llvm:9[${LLVM_TARGET_USEDEPS// /,}]
+	)
+	<sys-devel/llvm-11:=
+	wasm? ( sys-devel/lld )
+"
+LLVM_MAX_SLOT=10
+
+BOOTSTRAP_DEPEND="|| ( >=dev-lang/rust-1.$(($(ver_cut 2) - 1)) >=dev-lang/rust-bin-1.$(($(ver_cut 2) - 1)) )"
+
+BDEPEND="${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
+	)
+"
+
+# libgit2 should be at least same as bundled into libgit-sys #707746
+DEPEND="
+	>=dev-libs/libgit2-0.99:=
+	net-libs/libssh2:=
+	net-libs/http-parser:=
+	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? (
+		${LLVM_DEPEND}
+	)
+"
+
+RDEPEND="${DEPEND}
+	app-eselect/eselect-rust
+"
+
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+	miri? ( nightly )
+	parallel-compiler? ( nightly )
+	wasm? ( llvm_targets_WebAssembly )
+	x86? ( cpu_flags_x86_sse2 )
+"
+
+# we don't use cmake.eclass, but can get a warnin -l
+CMAKE_WARN_UNUSED_CLI=no
+
+QA_FLAGS_IGNORED="
+	usr/bin/.*-${PV}
+	usr/lib.*/${P}/lib.*.so.*
+	usr/lib.*/${P}/rustlib/.*/bin/.*
+	usr/lib.*/${P}/rustlib/.*/lib/lib.*.so.*
+"
+
+QA_SONAME="
+	usr/lib.*/${P}/lib.*.so.*
+	usr/lib.*/${P}/rustlib/.*/lib/lib.*.so.*
+"
+
+# tests need a bit more work, currently they are causing multiple
+# re-compilations and somewhat fragile.
+RESTRICT="test"
+
+PATCHES=(
+	"${FILESDIR}"/0012-Ignore-broken-and-non-applicable-tests.patch
+	"${FILESDIR}"/1.44.0-libressl.patch
+)
+
+S="${WORKDIR}/${MY_P}-src"
+
+toml_usex() {
+	usex "$1" true false
+}
+
+pre_build_checks() {
+	CHECKREQS_DISK_BUILD="9G"
+	eshopts_push -s extglob
+	if is-flagq '-g?(gdb)?([1-9])'; then
+		CHECKREQS_DISK_BUILD="15G"
+	fi
+	eshopts_pop
+	check-reqs_pkg_setup
+}
+
+pkg_pretend() {
+	pre_build_checks
+}
+
+pkg_setup() {
+	pre_build_checks
+	python-any-r1_pkg_setup
+
+	# required to link agains system libs, otherwise
+	# crates use bundled sources and compile own static version
+	export LIBGIT2_SYS_USE_PKG_CONFIG=1
+	export LIBSSH2_SYS_USE_PKG_CONFIG=1
+	export PKG_CONFIG_ALLOW_CROSS=1
+
+	if use system-llvm; then
+		llvm_pkg_setup
+
+		local llvm_config="$(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/' src/librustc_target/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]
+		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"
+		libdir = "$(get_libdir)/${P}"
+		docdir = "share/doc/${PF}"
+		mandir = "share/${P}/man"
+		[rust]
+		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)"
+		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() {
+	env $(cat "${S}"/config.env) RUST_BACKTRACE=1\
+		"${EPYTHON}" ./x.py build -vv --config="${S}"/config.toml -j$(makeopts_jobs) || die
+}
+
+src_test() {
+	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 \
+		src/test/codegen \
+		src/test/codegen-units \
+		src/test/compile-fail \
+		src/test/incremental \
+		src/test/mir-opt \
+		src/test/pretty \
+		src/test/run-fail \
+		src/test/run-make \
+		src/test/run-make-fulldeps \
+		src/test/ui \
+		src/test/ui-fulldeps || die
+}
+
+src_install() {
+	env $(cat "${S}"/config.env) DESTDIR="${D}" \
+		"${EPYTHON}" ./x.py install -vv --config="${S}"/config.toml || die
+
+	# bug #689562, #689160
+	rm "${D}/etc/bash_completion.d/cargo" || die
+	rmdir "${D}"/etc{/bash_completion.d,} || die
+	dobashcomp build/tmp/dist/cargo-image/etc/bash_completion.d/cargo
+
+	mv "${ED}/usr/bin/rustc" "${ED}/usr/bin/rustc-${PV}" || die
+	mv "${ED}/usr/bin/rustdoc" "${ED}/usr/bin/rustdoc-${PV}" || die
+	mv "${ED}/usr/bin/rust-gdb" "${ED}/usr/bin/rust-gdb-${PV}" || die
+	mv "${ED}/usr/bin/rust-gdbgui" "${ED}/usr/bin/rust-gdbgui-${PV}" || die
+	mv "${ED}/usr/bin/rust-lldb" "${ED}/usr/bin/rust-lldb-${PV}" || die
+	mv "${ED}/usr/bin/cargo" "${ED}/usr/bin/cargo-${PV}" || die
+	if use clippy; then
+		mv "${ED}/usr/bin/clippy-driver" "${ED}/usr/bin/clippy-driver-${PV}" || die
+		mv "${ED}/usr/bin/cargo-clippy" "${ED}/usr/bin/cargo-clippy-${PV}" || die
+	fi
+	if use miri; then
+		mv "${ED}/usr/bin/miri" "${ED}/usr/bin/miri-${PV}" || die
+		mv "${ED}/usr/bin/cargo-miri" "${ED}/usr/bin/cargo-miri-${PV}" || die
+	fi
+	if use rls; then
+		mv "${ED}/usr/bin/rls" "${ED}/usr/bin/rls-${PV}" || die
+	fi
+	if use rustfmt; then
+		mv "${ED}/usr/bin/rustfmt" "${ED}/usr/bin/rustfmt-${PV}" || die
+		mv "${ED}/usr/bin/cargo-fmt" "${ED}/usr/bin/cargo-fmt-${PV}" || die
+	fi
+
+	# Copy shared library versions of standard libraries for all targets
+	# into the system's abi-dependent lib directories because the rust
+	# installer only does so for the native ABI.
+
+	local abi_libdir rust_target
+	for v in $(multilib_get_enabled_abi_pairs); do
+		if [ ${v##*.} = ${DEFAULT_ABI} ]; then
+			continue
+		fi
+		abi_libdir=$(get_abi_LIBDIR ${v##*.})
+		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
+		mkdir -p "${ED}/usr/${abi_libdir}/${P}"
+		cp "${ED}/usr/$(get_libdir)/${P}/rustlib/${rust_target}/lib"/*.so \
+		   "${ED}/usr/${abi_libdir}/${P}" || die
+	done
+
+	# versioned libdir/mandir support
+	newenvd - "50${P}" <<-_EOF_
+		LDPATH="${EPREFIX}/usr/$(get_libdir)/${P}"
+		MANPATH="${EPREFIX}/usr/share/${P}/man"
+	_EOF_
+
+	dodoc COPYRIGHT
+	rm "${ED}/usr/share/doc/${P}"/*.old || die
+	rm "${ED}/usr/share/doc/${P}/LICENSE-APACHE" || die
+	rm "${ED}/usr/share/doc/${P}/LICENSE-MIT" || die
+
+	# note: eselect-rust adds EROOT to all paths below
+	cat <<-EOF > "${T}/provider-${P}"
+		/usr/bin/cargo
+		/usr/bin/rustdoc
+		/usr/bin/rust-gdb
+		/usr/bin/rust-gdbgui
+		/usr/bin/rust-lldb
+	EOF
+	if use clippy; then
+		echo /usr/bin/clippy-driver >> "${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-${P}"
+}
+
+pkg_postinst() {
+	eselect rust update --if-unset
+
+	elog "Rust installs a helper script for calling GDB and LLDB,"
+	elog "for your convenience it is installed under /usr/bin/rust-{gdb,lldb}-${PV}."
+
+	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
+
+	if use elibc_musl; then
+		ewarn "${PN} on *-musl targets is configured with crt-static"
+		ewarn ""
+		ewarn "you will need to set RUSTFLAGS=\"-C target-feature=-crt-static\" in make.conf"
+		ewarn "to use it with portage, otherwise you may see failures like"
+		ewarn "error: cannot produce proc-macro for serde_derive v1.0.98 as the target "
+		ewarn "x86_64-unknown-linux-musl does not support these crate types"
+	fi
+}
+
+pkg_postrm() {
+	eselect rust cleanup
+}