# Contributor: Zach van Rijn <me@zv.io>
# Maintainer: Zach van Rijn <me@zv.io>
pkgname=mrustc
pkgver=0.11.0
_rustcver=1.74.1
_minorver=${_rustcver%.*}.0
pkgrel=0
pkgdesc="Alternative rust compiler (re-implementation)"
url="https://github.com/thepowersgang/mrustc"
arch="x86_64"
license="MIT"
depends=""
makedepends="cmake python3 zlib-dev"
subpackages=""
source="mrustc-$pkgver.tar.gz::https://github.com/thepowersgang/mrustc/archive/refs/tags/v$pkgver.tar.gz
	https://static.rust-lang.org/dist/rustc-${_rustcver}-src.tar.xz

	rustc-0001-Fix-LLVM-build.patch
	rustc-0002-Fix-linking-to-zlib-when-cross-compiling.patch
	rustc-0003-Fix-rustdoc-when-cross-compiling-on-musl.patch
	rustc-0004-Remove-musl_root-and-CRT-fallback-from-musl-targets.patch
	rustc-0005-Prefer-libgcc_eh-over-libunwind-for-musl.patch
	rustc-0006-Link-libssp_nonshared.a-on-all-musl-targets.patch
	rustc-0007-test-failed-doctest-output-Fix-normalization.patch
	rustc-0008-test-sysroot-crates-are-unstable-Fix-test-when-rpath.patch
	rustc-0009-test-use-extern-for-plugins-Don-t-assume-multilib.patch
	rustc-0010-Ignore-broken-and-non-applicable-tests.patch
	rustc-0011-Link-stage-2-tools-dynamically-to-libstd.patch
	rustc-0012-Move-debugger-scripts-to-usr-share-rust.patch
	rustc-0013-Add-foxkit-target-specs.patch
	rustc-powerpc-atomics.patch
	rustc-ppc-libc-hugetlb.patch

	mrustc-use-cached-tarball.patch

	mrustc-0001-Fix-two-typos.patch
	mrustc-0002-HIR-Const-Eval-Fix-uninitialised-variable-leading-to.patch
	mrustc-0003-Patches-Add-extra-context-to-1.74-patch-file-hopeful.patch
	mrustc-0004-Patches-Fix-incorrect-line-numbers-in-patches.patch
	mrustc-0005-Patches-Fix-it-this-time.patch
	mrustc-0006-Codegen-C-Turn-down-gcc-optimisation-level-to-work-a.patch
	mrustc-0007-HIR-Typecheck-Properly-pass-type-params-to-const-eva.patch

	`#ppc32-default-target-detect.patch`
	mrustc-nuke-autodetection-logic.patch
	mrustc-unified-outdir.patch
	mrustc-adelie-targets.patch
	"

prepare() {
	# manual patches
	find .. -mindepth 1 -maxdepth 1 -name '*.patch' | sort | while read k; do
	(
		case "${k}" in
		*/rustc-*) cd "${srcdir}"/rustc-${_rustcver}-src; ;;
		*/mrustc-*) cd "${builddir}"; ;;
		*) printf "E: where to apply '%s'?\n" "${k}"; exit 1; ;;
		esac

		patch -p1 < "${k}"
	)
	done

	# force consistent default (only available) target
	# after we nuke all the auto-detection logic, and
	# note that "unknown" is required to avoid patching
	# a ton of crates (though that is a better solution)
	sed -i tools/common/target_detect.h \
		-e "s/__DEFAULT_TARGET_NAME__/${CHOST}/g" \
		-e "s/foxkit/unknown/g" \
		;

	# use our cached copy and do not download during build
	mv "${srcdir}"/rustc-${_rustcver}-src "${builddir}"/rustc-${_minorver}-src
}

build() {
	# experimental but do you really want to build llvm with -j1?
	export PARLEVEL="${JOBS}"

	# see 'adelie-targets.patch'
	# the problem is that '--target' is not consistently applied to
	# all stages of the bootstrap process, so things break
#	export MRUSTC_TARGET="${CHOST}"

	export RUSTC_VERSION=${_minorver} MRUSTC_TARGET_VER=${_rustcver%.*}

	make
	make RUSTCSRC

	# FIXME: this generates all the right code but does not execute 'gcc'
	# (to generate the required objects) when '--target' is given (which
	# is added due to explicit 'MRUSTC_TARGET' above). Run it manually if
	# you use 'MRUSTC_TARGET' or comment it out if not. It appears that
	# this happens due to the aforementioned inconsistent '--target' issue.
	make -f minicargo.mk LIBS
#	_fix="$(find output-${_minorver} -name 'lib*_cmd.txt' | sort) output-${_minorver}/dump_cmd.txt"
#	for k in ${_fix}; do gcc @"${k}"; done

	make test
	make local_tests

	RUSTC_INSTALL_BINDIR=bin make -f minicargo.mk output-${_minorver}/rustc

	LIBGIT2_SYS_USE_PKG_CONFIG=1 make -f minicargo.mk -j ${PARLEVEL:-1} output-${_minorver}/cargo
}

check() {
	./output-${_minorver}/rustc --version
	./output-${_minorver}/cargo --version
	./output-${_minorver}/rustc samples/no_core.rs
	#./output-${_minorver}/rustc samples/1.rs
}

package() {
	mkdir -p "$pkgdir"/usr/bin

	for k in cargo rustc; do
		cp "$builddir"/output-${_minorver}/${k} "$pkgdir"/usr/bin
	done
}

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