# Contributor: Jakub Jirutka <jakub@jirutka.cz>
# Contributor: Shiz <hi@shiz.me>
# Maintainer: Jakub Jirutka <jakub@jirutka.cz>
pkgname=rust
pkgver=1.16.0
# Git revision of prebuilt Cargo to use for bootstrapping, from src/stage0.txt.
_cargo_gitrev=6e0c18cccc8b0c06fba8a8d76486f81a792fb420
_llvmver=3.9
pkgrel=3
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.
source="https://static.rust-lang.org/dist/rustc-$pkgver-src.tar.gz
	https://repo.voidlinux.eu/distfiles/rustc-$pkgver-x86_64-unknown-linux-musl.tar.gz
	https://repo.voidlinux.eu/distfiles/rust-std-$pkgver-x86_64-unknown-linux-musl.tar.gz
	cargo-$_cargo_gitrev-x86_64-unknown-linux-musl.tar.gz::https://s3.amazonaws.com/rust-lang-ci/cargo-builds/$_cargo_gitrev/cargo-nightly-x86_64-unknown-linux-musl.tar.gz
	dont-require-filecheck.patch
	support-dynamically-linked-musl.patch
	allow-crt-static-on-stable.patch
	static-pie.patch
	fix-linux_musl_base.patch
	llvm-with-ffi.patch
	move-py-scripts-to-share.patch
	change-rpath-to-rustlib.patch
	force-rpath-on-prefer-dynamic.patch
	fix-jemalloc-musl.patch
	check-rustc
	"
builddir="$srcdir/rustc-$pkgver-src"

_ctarget="$CARCH-unknown-linux-musl"
_rlibdir="usr/lib/rustlib/$_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-*$_ctarget/rustc/* \
		"$srcdir"/rust-std-*$_ctarget/rust-std-*/* \
		"$srcdir"/cargo-*$_ctarget/cargo/* \
		"$_stage0dir"/
}

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 \
		--enable-rustbuild \
		--build="$_ctarget" \
		--host="$_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 \
#		VERBOSE=1
}

package() {
	cd "$builddir"

	make install \
		LD_LIBRARY_PATH="$_stage0dir/lib" \
		DESTDIR="$pkgdir"

	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="096b1b7406be9bc61161bb7cdd2061f2bc2174c161a31f4ed6ceecf7fc379f315fc2f7cb9f6c134ea4f8519c27bf6e5a3f712cf1e56d5785831d8c8374eb0ba5  rustc-1.16.0-src.tar.gz
e9b10d58ae5b51b09dd31a1dbf7367917bd40a05ecb4ba3e0e7ac229a0352d3ceb77de80f7c0120f553bd7904644da6bf973dbc32850b12dc91f3974846d4164  rustc-1.16.0-x86_64-unknown-linux-musl.tar.gz
54467213b2824112dec6d5a132ab01d69617a5ccaa9db15e5c8fad55dea5eb31b1b7c9ca07878901d75edd45dc84c726913bf651f3435c480a79703c074b5d90  rust-std-1.16.0-x86_64-unknown-linux-musl.tar.gz
4df33353b6be1af822220ca03f9ec5a3b6421c9b10ec17b864be586ba495c6210bac70d904b0e0b35eff62ef2c9a681ded526e5cbd37e326dc3146742aa659de  cargo-6e0c18cccc8b0c06fba8a8d76486f81a792fb420-x86_64-unknown-linux-musl.tar.gz
2002faf08cca3be702f25618bc17453c5e76644a6ff6b0739b642c2c0f8536ec7f09c98182aff6b2dcc87c77b0929f2f8f732b8242a8f80d94b3824c8cd0d0fe  dont-require-filecheck.patch
b0a8883e4469b60edd150c84486ab950396d757220f97bd271529576614c6c3b49456098507503832c20619d4bd74246dbc99c78116634a68a6df994793e9a94  support-dynamically-linked-musl.patch
b00997c65d1a451fafae8b547893c5cbf03f028d2d70f6971aa670f34c2d6fc82728c740ac4a9909fc1999925ff300e4525cfec745cb9c9521e564eb166872a2  allow-crt-static-on-stable.patch
79d7eb79bb5219beab2fa8394e30b830275ce3062fd7c02077229ad1fdca492f55d321e0bc1015f62252fe4df3cc41c5168ff9d2e848ae06b14f807add7e193a  static-pie.patch
5813ac0373cb550fff2a99f650a50852088e6f3cd0803edf77b1f1bfa712eb3da5d7579cfe6e00f1d06750b248a5c86d0fff17dc70a31b1520a6430adc64bceb  fix-linux_musl_base.patch
37416e1fa0bc0c8651cd060a645d6245ff7e2082279ab5e13495c5ee412c71915469019cfbec95a0fd9a7fc144475079a3ad16f0eba7a2f5c8dd99e0002f3225  llvm-with-ffi.patch
19cc2725d68db3e359e0e3016028374e5818a97fdba24d0103f7d1706601c8b17c4dd95a3152e64f982f98e95ad3e949acddbea8a39ed0ba8dd4f702acc2704d  move-py-scripts-to-share.patch
8d6206f8c50856724cf7b4c1854ec82547f040358a1c7d44abeacc27a5c205a963b1fec51e58ec06c68d85bd2f68a9e6e27ebe457f39e8dd043de17758f5063f  change-rpath-to-rustlib.patch
f230239d8de1b69536353e5735d3bf32f42a2715aefe4863622d9ab2b25d010209ed0bb38976eaa9302bce2eca6bd162abc8cefd71f689b65b3800920a50967b  force-rpath-on-prefer-dynamic.patch
a330fa913faeadb98cb95e644f434ddef4fbbea32bcd11b6621fb9e08f7b0d8c71fae702207465489af3cf793eade0af694a8c515fc1bed49624da25103a4862  fix-jemalloc-musl.patch
79549055dea81379c890b495c82456ab497a9179ec6702c59e11d0748bc668f47fc3d6a69c27a0545bb87c01318631dffc69260bf2d4badc75f53cbf7fad7528  check-rustc"