# Contributor: Jakub Jirutka <jakub@jirutka.cz>
# Maintainer: Jakub Jirutka <jakub@jirutka.cz>

# NOTE: This is a fork of LLVM project needed for emscripten. It provides
#   JSBackend and WebAssembly, these will be hopefully someday merged into
#   upstream LLVM.
# TODO: Remove unneeded binaries.
pkgname=emscripten-fastcomp
# Keep in sync with package emscripten!
pkgver=1.37.9
pkgrel=1
pkgdesc="The Clang + LLVM backend for Emscripten"
url="https://kripken.github.io/emscripten-site/"
arch="all"
license="UOI-NCSA"
depends="python2"
makedepends="cmake paxmark zlib-dev"
source="$pkgname.tar.gz::https://github.com/kripken/$pkgname/archive/$pkgver.tar.gz
	$pkgname-clang.tar.gz::https://github.com/kripken/$pkgname-clang/archive/$pkgver.tar.gz
	fix-build-with-musl-libc.patch
	fix-DynamicLibrary-to-build-with-musl-libc.patch"
builddir="$srcdir/$pkgname-$pkgver"
options="!check"  # some tests are broken, don't bother with it for now

_prefix="/usr/lib/$pkgname"
ldpath="$_prefix/lib"
# Avoid conflicts in provided so:* names with llvm package.
sonameprefix="$pkgname:"

prepare() {
	ln -sf ../../$pkgname-clang-$pkgver "$builddir"/tools/clang

	default_prepare
}

build() {
	mkdir -p "$builddir"/build
	cd "$builddir"/build

	# XXX: Is it a good idea to omit X86 in LLVM_TARGETS_TO_BUILD?
	# https://github.com/kripken/emscripten-fastcomp/issues/174
	cmake .. \
		-DCMAKE_BUILD_TYPE=Release \
		-DCMAKE_INSTALL_PREFIX="$_prefix" \
		-DCMAKE_CXX_FLAGS="$CXXFLAGS" \
		-DCMAKE_C_FLAGS="$CFLAGS" \
		-DPYTHON_EXECUTABLE=/usr/bin/python2 \
		-DLLVM_HOST_TRIPLE="$CHOST" \
		-DLLVM_BUILD_LLVM_DYLIB=ON \
		-DLLVM_LINK_LLVM_DYLIB=ON \
		-DLLVM_TARGETS_TO_BUILD=JSBackend \
		-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly \
		-DLLVM_BUILD_RUNTIME=OFF \
		-DLLVM_INCLUDE_EXAMPLES=OFF \
		-DLLVM_ENABLE_ZLIB=ON \
		-DCLANG_INCLUDE_EXAMPLES=OFF
	make -j ${JOBS:-2}

	paxmark m bin/llvm-rtdyld \
		bin/lli \
		bin/lli-child-target
}

package() {
	cd "$builddir"/build
	make install DESTDIR="$pkgdir"

	cd "$pkgdir"/$_prefix

	# emcc -v expects this file to exist.
	cp "$builddir"/emscripten-version.txt .

	# Remove unneeded files and clutter.
	rm -r include libexec share lib/clang lib/cmake
	rm lib/*.a bin/*-test
}

sha512sums="443d22163866a409b6218bb686d52b845051350ef4af546e2d52ffaca03ed363f3cbf8f8e61b7fc28c1e1007d7e2789bfd74d91159deff46e3c6e1913ffebf34  emscripten-fastcomp.tar.gz
5c1fae88e87575571fef767f9c3d664c0eed106d566517871503c75cb5e31777d5fd5773f914fbe932abde3b42870b25e4ca58cf458ceecd0f9a7a50e7d86af9  emscripten-fastcomp-clang.tar.gz
5596bb1b4d4f7da8fef5f7e85a50de797dd88c1d93c7fcc9ff585093fd56d292222496e8e28e6a7d90effcfbf11c486636025646d65ba928fcb52352d1eb6336  fix-build-with-musl-libc.patch
01c0f994eb364fc0b02f7c97268f0bc470ed9d404bb2c013196005a6c0be91c9634f092aa262fc5c4e7ae72e36140f259efe9d8ec3a613f4b9aa7aa7b4b57759  fix-DynamicLibrary-to-build-with-musl-libc.patch"