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# Contributor: Jakub Jirutka <jakub@jirutka.cz>
# Contributor: Shiz <hi@shiz.me>
# Maintainer: Jakub Jirutka <jakub@jirutka.cz>
pkgname=rust
pkgver=1.17.0
# Git revision of prebuilt Cargo to use for bootstrapping, from src/stage0.txt.
_cargo_gitrev=6b05583d71f982bcad049b9fa094c637c062e751
_llvmver=3.9
_bootver=1.16.0
pkgrel=2
pkgdesc="The Rust Programming Language (compiler)"
url="http://www.rust-lang.org"
arch="x86_64"
license="ASL-2.0 BSD ISC MIT"
# gcc is needed at runtime just for linking. Someday rustc might invoke
# the linker directly, and then we'll only need binutils.
# See: https://github.com/rust-lang/rust/issues/11937
depends="$pkgname-stdlib=$pkgver-r$pkgrel gcc llvm-libunwind-dev musl-dev"
# libffi-dev is needed just because we compile llvm with LLVM_ENABLE_FFI.
makedepends="cmake file libffi-dev llvm$_llvmver-dev python2 tar zlib-dev"
subpackages="$pkgname-dbg $pkgname-stdlib
	$pkgname-gdb::noarch $pkgname-lldb::noarch $pkgname-doc"

# XXX: Rust is self-hosted, so you need rustc to build rustc... The problem is
# that Rust doesn't provide prebuilt rustc for musl yet. Thus we use binaries
# from VoidLinux for now.
# Follow https://github.com/rust-lang/rust/issues/31322.
_cbuild="$CARCH-unknown-linux-musl"
source="https://static.rust-lang.org/dist/rustc-$pkgver-src.tar.gz
	https://repo.voidlinux.eu/distfiles/rustc-$_bootver-$_cbuild.tar.gz
	https://repo.voidlinux.eu/distfiles/rust-std-$_bootver-$_cbuild.tar.gz
	cargo-$_cargo_gitrev-$_cbuild.tar.gz::https://s3.amazonaws.com/rust-lang-ci/cargo-builds/$_cargo_gitrev/cargo-nightly-$_cbuild.tar.gz
	musl-support-dynamic-linking.patch
	musl-fix-static-linking.patch
	musl-fix-linux_musl_base.patch
	musl-fix-jemalloc.patch
	llvm-with-ffi.patch
	static-pie.patch
	need-rpath.patch
	minimize-rpath.patch
	alpine-allow-crt-static.patch
	alpine-move-py-scripts-to-share.patch
	alpine-change-rpath-to-rustlib.patch
	alpine-target.patch
	check-rustc
	"
builddir="$srcdir/rustc-$pkgver-src"

_rlibdir="usr/lib/rustlib/$CTARGET/lib"
_sharedir="usr/share/rust"
_stage0dir="$srcdir/stage0"

ldpath="/$_rlibdir"

prepare() {
	default_prepare

	cd "$builddir"

	local stage0_cargo=$(sed -En 's/^cargo:\s*(\S+)$/\1/p' src/stage0.txt)
	if [ "$_cargo_gitrev" != "$stage0_cargo" ]; then
		error "Update Cargo revision to: $stage0_cargo"; return 1
	fi

	# Don't set wrong LD_LIBRARY_PATH, we will rather set it manually when
	# invoking make.
	sed -i /LD_LIBRARY_PATH/d src/bootstrap/bootstrap.py

	# Remove bundled dependencies.
	rm -Rf src/llvm/ src/jemalloc/

	# Prepare our stage0 for bootstrapping.
	mkdir -p "$_stage0dir"
	cp -flr "$srcdir"/rustc-*$_cbuild/rustc/* \
		"$srcdir"/rust-std-*$_cbuild/rust-std-*/* \
		"$srcdir"/cargo-*$_cbuild/cargo/* \
		"$_stage0dir"/

	# Make sure to use the bundled LLVM.
	printf '[target.%s]\nllvm_config = "/usr/lib/llvm%s/bin/llvm-config"\n' \
		"$CTARGET" "$_llvmver" > config.toml
}

build() {
	cd "$builddir"

	# jemalloc is disabled, because it increases size of statically linked
	# binaries produced by rustc (stripped hello_world 186 kiB vs. 358 kiB)
	# for only tiny performance boost (even negative in some tests).
	./configure \
		--build="$_cbuild" \
		--host="$CTARGET" \
		--target="$CTARGET" \
		--prefix="/usr" \
		--release-channel="stable" \
		--enable-local-rust \
		--local-rust-root="$_stage0dir" \
		--llvm-root="/usr/lib/llvm$_llvmver" \
		--musl-root="/usr" \
		--enable-vendor \
		--enable-llvm-link-shared \
		--disable-jemalloc \
		--disable-docs

	# Set LD_LIBRARY_PATH, so rustc in stage0 can find correct libs.
	make \
		LD_LIBRARY_PATH="$_stage0dir/lib" \
		RUST_BACKTRACE=1 \
		RUST_CRT_STATIC="false" \
		VERBOSE=1
}

check() {
	"$srcdir"/check-rustc "$builddir/build/$CTARGET/stage2/bin/rustc"

# XXX: There's some problem with these tests, we will figure it out later.
#	cd "$builddir"
#	make check \
#		LD_LIBRARY_PATH="$_stage0dir/lib" \
#		RUST_BACKTRACE=1 \
#		RUST_CRT_STATIC="false" \
#		VERBOSE=1
}

package() {
	cd "$builddir"

	make dist \
		LD_LIBRARY_PATH="$_stage0dir/lib" \
		RUST_BACKTRACE=1 \
		RUST_CRT_STATIC="false" \
		VERBOSE=1

	local component; for component in rustc rust-std; do
		tar -xf "build/dist/$component-$pkgver-$CTARGET.tar.gz"
		./"$component-$pkgver-$CTARGET"/install.sh --destdir="$pkgdir" --prefix=/usr --disable-ldconfig
	done

	cd "$pkgdir"

	# These libraries are identical to those under rustlib/. Since we have
	# linked rustc/rustdoc against those under rustlib/, we can remove
	# them. Read change-rpath-to-rustlib.patch for more info.
	rm -r usr/lib/*.so

	# These objects are for static linking with musl on non-musl systems.
	rm $_rlibdir/crt*.o

	# Shared objects should have executable flag.
	chmod +x $_rlibdir/*.so

	# Python scripts are noarch, so move them to /usr/share.
	# Requires move-py-scripts-to-share.patch to be applied.
	_mv usr/lib/rustlib/etc/*.py $_sharedir/etc/
	rmdir -p usr/lib/rustlib/etc 2>/dev/null || true

	# Remove some clutter.
	cd usr/lib/rustlib
	rm components install.log manifest-* rust-installer-version uninstall.sh
}

stdlib() {
	pkgdesc="Standard library for Rust (static rlibs)"

	_mv "$pkgdir"/$_rlibdir/*.rlib "$subpkgdir"/$_rlibdir/
}

gdb() {
	pkgdesc="GDB pretty printers for Rust"
	depends="$pkgname gdb"

	mkdir -p "$subpkgdir"
	cd "$subpkgdir"

	_mv "$pkgdir"/usr/bin/rust-gdb usr/bin/
	_mv "$pkgdir"/$_sharedir/etc/gdb_*.py $_sharedir/etc/
}

lldb() {
	pkgdesc="LLDB pretty printers for Rust"
	depends="$pkgname lldb py-lldb"

	mkdir -p "$subpkgdir"
	cd "$subpkgdir"

	_mv "$pkgdir"/usr/bin/rust-lldb usr/bin/
	_mv "$pkgdir"/$_sharedir/etc/lldb_*.py $_sharedir/etc/
}

_mv() {
	local dest; for dest; do true; done  # get last argument
	mkdir -p "$dest"
	mv $@
}

sha512sums="781799b29d83b4f0f433814bd818df034526db8e7f88c2df51d3b814eacafe8098d4bbe47ace951e1943325b3267b244007cf04f1f11083645b25aeacd40ebb6  rustc-1.17.0-src.tar.gz
e9b10d58ae5b51b09dd31a1dbf7367917bd40a05ecb4ba3e0e7ac229a0352d3ceb77de80f7c0120f553bd7904644da6bf973dbc32850b12dc91f3974846d4164  rustc-1.16.0-x86_64-unknown-linux-musl.tar.gz
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c913d04ef419b2b6d8e453f72894070f263c9292abf97114a51884d475d03ce5b032053f1676ba9364800b4b35e394f707995058530ad5e4122c60f65ddd3db7  musl-fix-jemalloc.patch
dc6432293bd060d5e3a73f25870867654fae61995dcd919e244a2dc686b6107556deed8c59ca6002182bfeff5ebc1ca2b89c4028ab0fbfb79e65defe47c9b4b0  llvm-with-ffi.patch
5aaf6715b27b8b786740a55b91216d47985fbef3ccb0ef7e6a81696a2823671f8306143f7ecf77e66af91ef1500072524b9b4c7569508922ad5268df6080fda1  static-pie.patch
ff633f2a46c683ad698d1c09c98c06ce9ee9b8d55fa5593cdd485b439ebca3273794d29b5ff32b887be8666f52913a23af6e133c782bd0c4e2c88e306dd3a494  need-rpath.patch
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b00997c65d1a451fafae8b547893c5cbf03f028d2d70f6971aa670f34c2d6fc82728c740ac4a9909fc1999925ff300e4525cfec745cb9c9521e564eb166872a2  alpine-allow-crt-static.patch
498f4649163974afc4f042c43cd0c15d36784031514201a2962061f288a9336c2bc9749f8d2308b8ce3656f8097b5fc5bef505f61e2a6ed422ef4153f5339d77  alpine-move-py-scripts-to-share.patch
8d6206f8c50856724cf7b4c1854ec82547f040358a1c7d44abeacc27a5c205a963b1fec51e58ec06c68d85bd2f68a9e6e27ebe457f39e8dd043de17758f5063f  alpine-change-rpath-to-rustlib.patch
aaf359dbfb8f379bef42647890e99ada4b5326c29f726edb16c51b23a5033b5e00363d2fb6d74a4f11dfbb241b21b22c578e2ec269ecd77a87cf20d3620b29a5  alpine-target.patch
79549055dea81379c890b495c82456ab497a9179ec6702c59e11d0748bc668f47fc3d6a69c27a0545bb87c01318631dffc69260bf2d4badc75f53cbf7fad7528  check-rustc"