# Contributor: Travis Tilley <ttilley@gmail.com>
# Contributor: Mitch Tishmack <mitch.tishmack@gmail.com>
# Contributor: Jakub Jirutka <jakub@jirutka.cz>
# Maintainer: Jakub Jirutka <jakub@jirutka.cz>
_pkgname=llvm
pkgver=4.0.0
_majorver=${pkgver%%.*}
pkgname=$_pkgname$_majorver
pkgrel=2
pkgdesc="Low Level Virtual Machine compiler system (version $_majorver)"
arch="all"
url="http://llvm.org/"
license="UOI-NCSA"
provides="llvm=$pkgver-r$pkgrel"
replaces="llvm"
depends_dev="$pkgname=$pkgver-r$pkgrel"
makedepends="binutils-dev chrpath cmake file libffi-dev paxmark python2 zlib-dev"
subpackages="$pkgname-static $pkgname-libs $pkgname-dev"
source="http://llvm.org/releases/$pkgver/llvm-$pkgver.src.tar.xz
	llvm-fix-build-with-musl-libc.patch
	llvm-fix-DynamicLibrary-to-build-with-musl-libc.patch
	cmake-fix-libLLVM-name.patch
	disable-FileSystemTest.CreateDir-perms-assert.patch
	silent-amdgpu-test-failing.patch
	fix-CheckAtomic.cmake.patch
	"
builddir="$srcdir/$_pkgname-$pkgver.src"

# ARM has few failures in test suite that we don't care about currently and
# also it takes forever to run them on the builder.
case "$CARCH" in
	arm*) options="!check";;
esac

# NOTE: It seems that there's no (sane) way how to change includedir, sharedir
# etc. separately, just the CMAKE_INSTALL_PREFIX. Standard CMake variables and
# even  LLVM-specific variables, that are related to these paths, actually
# don't work (in llvm 3.7).
#
# When building a software that depends on LLVM, utility llvm-config should be
# used to discover where is LLVM installed. It provides options to print
# path of bindir, includedir, and libdir separately, but in its source, all
# these paths are actually hard-coded against INSTALL_PREFIX. We can patch it
# and move paths manually, but I'm really not sure what it may break...
#
# Also note that we should *not* add version suffix to files in llvm bindir!
# It breaks build system of some software that depends on LLVM, because they
# don't expect these files to have a sufix.
#
# So, we install all the LLVM files into /usr/lib/llvm$_majorver.
# BTW, Fedora and Debian do the same thing.
#
_prefix="usr/lib/llvm$_majorver"

prepare() {
	default_prepare
	cd "$builddir"

	# https://bugs.llvm.org//show_bug.cgi?id=31870
	rm test/tools/llvm-symbolizer/print_context.c

	mkdir -p "$builddir"/build
}

build() {
	cd "$builddir"/build

	# Auto-detect it by guessing either.
	local ffi_include_dir="$(pkg-config --cflags-only-I libffi | sed 's|^-I||g')"

	cmake -G "Unix Makefiles" -Wno-dev \
		-DCMAKE_BUILD_TYPE=Release \
		-DCMAKE_INSTALL_PREFIX=/$_prefix \
		-DCMAKE_VERBOSE_MAKEFILE=NO \
		-DFFI_INCLUDE_DIR="$ffi_include_dir" \
		-DLLVM_BINUTILS_INCDIR=/usr/include \
		-DLLVM_BUILD_DOCS=OFF \
		-DLLVM_BUILD_EXAMPLES=OFF \
		-DLLVM_BUILD_EXTERNAL_COMPILER_RT=ON \
		-DLLVM_BUILD_LLVM_DYLIB=ON \
		-DLLVM_BUILD_TESTS=ON \
		-DLLVM_DEFAULT_TARGET_TRIPLE="$CBUILD" \
		-DLLVM_DYLIB_EXPORT_ALL=ON \
		-DLLVM_ENABLE_ASSERTIONS=OFF \
		-DLLVM_ENABLE_CXX1Y=ON \
		-DLLVM_ENABLE_FFI=ON \
		-DLLVM_ENABLE_LIBCXX=OFF \
		-DLLVM_ENABLE_PIC=ON \
		-DLLVM_ENABLE_RTTI=ON \
		-DLLVM_ENABLE_SPHINX=OFF \
		-DLLVM_ENABLE_TERMINFO=ON \
		-DLLVM_ENABLE_ZLIB=ON \
		-DLLVM_HOST_TRIPLE="$CHOST" \
		-DLLVM_INCLUDE_EXAMPLES=OFF \
		-DLLVM_LINK_LLVM_DYLIB=ON \
		-DLLVM_TARGETS_TO_BUILD='X86;ARM;AArch64;PowerPC;SystemZ;AMDGPU;NVPTX;Mips;BPF' \
		"$builddir"

	make llvm-tblgen
	make

	paxmark m \
		bin/llvm-rtdyld \
		bin/lli \
		bin/lli-child-target \
		unittests/ExecutionEngine/MCJIT/MCJITTests \
		unittests/ExecutionEngine/Orc/OrcJITTests \
		unittests/Support/SupportTests
}

check() {
	cd "$builddir"/build

	# XXX: Few tests fail on s390x, ignore it for now. See build log
	# https://gist.github.com/jirutka/6edc951ad5b8002cf1780546cf661edc
	case "$CARCH" in
		s390x) make check-llvm || true;;
		*) make check-llvm;;
	esac
}

package() {
	cd "$builddir"/build

	make DESTDIR="$pkgdir" install

	# This tool is needed e.g. for running codegen tests in Rust package.
	install -D -m 755 bin/FileCheck "$pkgdir"/$_prefix/bin/FileCheck

	cd "$pkgdir"/$_prefix

	# Remove RPATHs.
	file lib/*.so bin/* \
		| awk -F: '$2~/ELF/{print $1}' \
		| xargs -r chrpath -d

	# Symlink files from /usr/lib/llvm*/bin to /usr/bin.
	mkdir -p "$pkgdir"/usr/bin
	local name newname path
	for path in bin/*; do
		name=${path##*/}
		# Add version infix/suffix to the executable name.
		case "$name" in
			llvm-*) newname="llvm$_majorver-${name#llvm-}";;
			*) newname="$name$_majorver";;
		esac
		# If this package provides=llvm (i.e. it's the default/latest
		# llvm package), omit version infix/suffix.
		if [ -n "$provides" ]; then
			newname=$name
		fi
		case "$name" in
			FileCheck | obj2yaml | yaml2obj) continue;;
		esac
		ln -s ../lib/llvm$_majorver/bin/$name "$pkgdir"/usr/bin/$newname
	done

	# Move /usr/lib/$pkgname/include/ into /usr/include/$pkgname/
	# and symlink it back.
	_mv include/* "$pkgdir"/usr/include/$pkgname/
	rmdir include
	ln -s ../../include/$pkgname include

	# Move /usr/lib/$pkgname/lib/cmake/llvm/ into /usr/lib/cmake/$pkgname/
	# and symlink it back.
	_mv lib/cmake/llvm/* "$pkgdir"/usr/lib/cmake/$pkgname/
	rmdir lib/cmake/llvm
	ln -s ../../../cmake/$pkgname lib/cmake/llvm
}

static() {
	pkgdesc="LLVM $_majorver static libraries"
	provides="llvm-static=$pkgver-r$pkgrel"

	_mv "$pkgdir"/$_prefix/lib/*.a "$subpkgdir"/$_prefix/lib/
}

libs() {
	pkgdesc="LLVM $_majorver runtime library"
	provides="llvm-libs=$pkgver-r$pkgrel"
	local soname="libLLVM-$_majorver.0.so"
	local soname2="libLLVM-$pkgver.so"

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

	# libLLVM should be in /usr/lib. This is needed for binaries that are
	# dynamically linked with libLLVM, so they can find it on default path.
	_mv "$pkgdir"/$_prefix/lib/$soname usr/lib/
	ln -s $soname usr/lib/$soname2

	# And also symlink it back to the LLVM prefix.
	mkdir -p $_prefix/lib
	ln -s ../../$soname $_prefix/lib/$soname
	ln -s ../../$soname $_prefix/lib/$soname2
}

dev() {
	provides="llvm-dev=$pkgver-r$pkgrel"
	default_dev
	cd "$subpkgdir"

	_mv "$pkgdir"/$_prefix/lib $_prefix/
	_mv "$pkgdir"/$_prefix/include $_prefix/

	_mv "$pkgdir"/$_prefix/bin/FileCheck $_prefix/bin/
	_mv "$pkgdir"/$_prefix/bin/llvm-config $_prefix/bin/
}

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

sha512sums="cf681f0626ef6d568d951cdc3e143471a1d7715a0ba11e52aa273cf5d8d421e1357ef2645cc85879eaefcd577e99e74d07b01566825b3d0461171ef2cbfc7704  llvm-4.0.0.src.tar.xz
f84cd65d7042e89826ba6e8d48c4c302bf4980da369d7f19a55f217e51c00ca8ed178d453df3a3cee76598a7cecb94aed0775a6d24fe73266f82749913fc3e71  llvm-fix-build-with-musl-libc.patch
19bfb9282455d39d07dbb2b1293b03a45c57d522fbb9c5e58dac034200669628b97e7a90cd4ff5d52d9bb79acfccbef653d8a1140a7f0589ecd6f9b7c4ba0eb6  llvm-fix-DynamicLibrary-to-build-with-musl-libc.patch
6d1a716e5aa24e6b9a3acf4cc11e2504b1b01abf574074e9e5617b991de87d5e4e687eb18e85e73d5e632568afe2fc357771c4c96f9e136502071991496fb78c  cmake-fix-libLLVM-name.patch
49c47f125014b60d0ea7870f981a2c1708ad705793f89287ed846ee881a837a4dc0170bf467e03f2ef56177473128945287749ac80dc2d13cfabcf8b929ba58a  disable-FileSystemTest.CreateDir-perms-assert.patch
97f788110abbb9e6add2e3a3d3b606dc2817ab726b74ead71241fc5433ba42d5d58e23be91a3b2444eb687c4f56a7c879bf5453e96f9785ce3541301329dda9c  silent-amdgpu-test-failing.patch
3bcfeccc1f14567f99029a131b1289290226d48855857f2eb6a251e041981a8b8b2d7965099df16ebf0a406e48130679f97235ef3f3524577413bb51cf40e613  fix-CheckAtomic.cmake.patch"