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# Copyright 2024-2025 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
inherit edo multiprocessing rust-toolchain toolchain-funcs
# The makefile needs to know the version of rust to build
RUST_VERSION=1.74.1
# We need to pretend to be this version of Rust for mrustc build and outputs
MRUSTC_RUST_VER=1.74.0
DESCRIPTION="Mutabah's Rust Compiler"
HOMEPAGE="https://github.com/thepowersgang/mrustc"
if [[ ${PV} == *"9999"* ]]; then
inherit git-r3
EGIT_REPO_URI="https://github.com/thepowersgang/mrustc.git"
else
SRC_URI="https://github.com/thepowersgang/mrustc/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz
https://static.rust-lang.org/dist/rustc-${RUST_VERSION}-src.tar.xz
"
KEYWORDS="~amd64"
fi
LICENSE="MIT"
SLOT="0"
DEPEND="sys-libs/zlib"
# mrustc transpiles Rust to C, and currently the C code it generates doesn't currently work with clang
RDEPEND="
${DEPEND}
sys-devel/gcc:*
"
BDEPEND="sys-devel/gcc:*"
PATCHES=(
"${FILESDIR}/${PN}-0.11.2-gcc15.patch"
"${FILESDIR}/${PN}-0.11.2-dont-strip-bins.patch"
"${FILESDIR}/${PN}-0.11.0-default-to-rust-1_74.patch"
"${FILESDIR}/${PN}-0.11.0-RUSTC_SRC_PROVIDED.patch"
"${FILESDIR}/${PN}-0.10.1-git-be-gone.patch"
)
QA_FLAGS_IGNORED="
usr/lib/rust/${P}/bin/mrustc
usr/lib/rust/${P}/bin/minicargo
usr/lib/rust/${P}/lib/rustlib/$(rust_abi)/lib/*.rlib
"
pkg_setup() {
if [[ ${MERGE_TYPE} != binary ]] && ! tc-is-gcc; then
die "mrustc needs to be built using GCC."
fi
}
src_configure() {
:
}
src_compile() {
export PARLEVEL=$(makeopts_jobs)
export RUSTC_VERSION=${MRUSTC_RUST_VER} # Pretend that we're using upstream-supported Rust
export MRUSTC_TARGET_VER=${RUSTC_VERSION%.*}
export RUSTCSRC="${WORKDIR}/rustc-${RUST_VERSION}-src"
export RUSTC_SRC_PROVIDED=1
export V='' # echo build commands in makefiles (minicargo still writes commands to file)
# build mrustc & minicargo then use them to build the standard library
# emake -f minicargo.mk will do everything including a full bootstrap
emake all
emake -C tools/minicargo/
# It's not much, but it's enough to do a 'hello world' at least... and build dev-lang/rust!
emake -e -f minicargo.mk LIBS
}
src_test() {
# The main makefile test targets just do this, cut out the middleman
emake -e -f minicargo.mk local_tests
# build and run 'hello world' (this is called using 'test' in the makefile, but we can do it manually)
edo "${S}"/bin/mrustc -L "${S}"/output-${MRUSTC_RUST_VER}/ \
-g "${S}/../rustc-${RUST_VERSION}-src/tests/ui/hello_world/main.rs" -o "${T}"/hello
"${T}"/hello || die "Failed to run hello_world built with mrustc"
}
src_install() {
# If we're installing into /usr/lib/rust we may as well be consistent
into /usr/lib/rust/${P}
dobin bin/mrustc
dobin bin/minicargo
local lib patch
local libs=( "${S}"/output-*/*.rlib* )
insinto "/usr/lib/rust/${P}/lib/rustlib/$(rust_abi)/lib"
# If we ever want to support mrustc stdlib for multiple rusts we'll need to
# do something more clever here.
for lib in "${libs[@]}"; do
# We only want .rlib{,.hir,o}
if [[ ${lib} != *.c && ${lib} != *.d && ${lib} != *.txt ]]; then
doins "${lib}"
fi
done
# For convenience, install files required to build various rusts
insinto /usr/share/${P}
doins -r "${S}/script-overrides/"
insinto /usr/share/${P}/patches
for patch in "${S}"/rustc-*.patch "${S}"/rustc-*-overrides.toml; do
doins "${patch}"
done
}
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