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diff --git a/dev-lang/rust/rust-1.31.1-r1337.ebuild b/dev-lang/rust/rust-1.31.1-r1337.ebuild
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+# Copyright 1999-2018 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+PYTHON_COMPAT=( python2_7 python3_{5,6} pypy )
+
+inherit check-reqs eapi7-ver 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="${MY_P}-src.tar.xz"
+ KEYWORDS="~amd64"
+fi
+
+RUST_STAGE0_VERSION="1.$(($(ver_cut 2) - 1)).1"
+
+DESCRIPTION="Systems programming language from Mozilla"
+HOMEPAGE="https://www.rust-lang.org/"
+
+SRC_URI="https://static.rust-lang.org/dist/${SRC} -> rustc-${PV}-src.tar.xz
+ $(rust_arch_uri x86_64-unknown-linux-gnu rust-${RUST_STAGE0_VERSION})"
+
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM BPF Hexagon Lanai Mips MSP430
+ NVPTX PowerPC Sparc SystemZ 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 +jemalloc libressl rls rustfmt system-llvm wasm ${ALL_LLVM_TARGETS[*]}"
+
+COMMON_DEPEND="
+ jemalloc? ( dev-libs/jemalloc )
+ sys-libs/zlib
+ !libressl? ( dev-libs/openssl:0= )
+ libressl? ( dev-libs/libressl:0= )
+ net-libs/libssh2
+ net-libs/http-parser:=
+ net-misc/curl[ssl]
+ system-llvm? ( >=sys-devel/llvm-6:= )"
+DEPEND="${COMMON_DEPEND}
+ ${PYTHON_DEPS}
+ || (
+ >=sys-devel/gcc-4.7
+ >=sys-devel/clang-3.5
+ )
+ dev-util/cmake"
+RDEPEND="${COMMON_DEPEND}
+ !dev-util/cargo
+ rustfmt? ( !dev-util/rustfmt )"
+REQUIRED_USE="|| ( ${ALL_LLVM_TARGETS[*]} )
+ x86? ( cpu_flags_x86_sse2 )"
+
+S="${WORKDIR}/${MY_P}-src"
+
+PATCHES=( "${FILESDIR}"/1.30.1-clippy-sysroot.patch )
+
+toml_usex() {
+ usex "$1" true false
+}
+
+pre_build_checks() {
+ CHECKREQS_DISK_BUILD="7G"
+ CHECKREQS_MEMORY="4G"
+ eshopts_push -s extglob
+ if is-flagq '-g?(gdb)?([1-9])'; then
+ CHECKREQS_DISK_BUILD="10G"
+ CHECKREQS_MEMORY="16G"
+ fi
+ eshopts_pop
+ check-reqs_pkg_setup
+}
+
+pkg_pretend() {
+ pre_build_checks
+}
+
+pkg_setup() {
+ pre_build_checks
+ python-any-r1_pkg_setup
+ if use system-llvm; then
+ llvm_pkg_setup
+ fi
+}
+
+src_prepare() {
+ local rust_stage0_root="${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
+
+ 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\""
+ fi
+ rust_targets="${rust_targets#,}"
+
+ local extended="true" tools="\"cargo\","
+ if use clippy; then
+ tools="\"clippy\",$tools"
+ fi
+ if use rls; then
+ tools="\"rls\",\"analysis\",\"src\",$tools"
+ fi
+ if use rustfmt; then
+ tools="\"rustfmt\",$tools"
+ fi
+
+ local rust_stage0_root="${WORKDIR}"/rust-stage0
+
+ rust_target="$(rust_abi)"
+
+ cat <<- EOF > "${S}"/config.toml
+ [llvm]
+ optimize = $(toml_usex !debug)
+ release-debuginfo = $(toml_usex debug)
+ assertions = $(toml_usex debug)
+ targets = "${LLVM_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 = $(toml_usex doc)
+ submodules = false
+ python = "${EPYTHON}"
+ locked-deps = true
+ vendor = true
+ extended = ${extended}
+ tools = [${tools}]
+ [install]
+ prefix = "${EPREFIX}/usr"
+ libdir = "$(get_libdir)/${P}"
+ docdir = "share/doc/${P}"
+ mandir = "share/${P}/man"
+ [rust]
+ optimize = $(toml_usex !debug)
+ debuginfo = $(toml_usex debug)
+ debug-assertions = $(toml_usex debug)
+ use-jemalloc = $(toml_usex jemalloc)
+ default-linker = "$(tc-getCC)"
+ channel = "stable"
+ rpath = false
+ lld = $(toml_usex wasm)
+ 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
+ if use system-llvm; then
+ cat <<- EOF >> "${S}"/config.toml
+ llvm-config = "$(get_llvm_prefix)/bin/llvm-config"
+ EOF
+ fi
+ done
+
+ if use wasm; then
+ cat <<- EOF >> "${S}"/config.toml
+ [target.wasm32-unknown-unknown]
+ linker = "rust-lld"
+ EOF
+ fi
+}
+
+src_compile() {
+ env $(cat "${S}"/config.env)\
+ "${EPYTHON}" ./x.py build --config="${S}"/config.toml -j$(makeopts_jobs) \
+ --exclude src/tools/miri || die # https://github.com/rust-lang/rust/issues/52305
+}
+
+src_install() {
+ local rust_target abi_libdir
+
+ env DESTDIR="${D}" "${EPYTHON}" ./x.py install || die
+
+ # 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.
+ 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 ${v##*.}))
+ mkdir -p "${D}/usr/${abi_libdir}"
+ cp "${D}/usr/$(get_libdir)/${P}/rustlib/${rust_target}/lib"/*.so \
+ "${D}/usr/${abi_libdir}" || die
+ done
+
+ dodoc COPYRIGHT
+
+ # FIXME:
+ # Really not sure if that env is needed, specailly LDPATH
+ cat <<-EOF > "${T}"/50${P}
+ LDPATH="/usr/$(get_libdir)/${P}"
+ MANPATH="/usr/share/${P}/man"
+ EOF
+ doenvd "${T}"/50${P}
+}