# 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=3.9.1
_majorver=${pkgver%.*}
pkgname=$_pkgname$_majorver
pkgrel=4
pkgdesc="Low Level Virtual Machine compiler system (version $_majorver)"
arch="all"
url="http://llvm.org/"
license="UOI-NCSA"
depends_dev="$pkgname=$pkgver-r$pkgrel"
makedepends="binutils-dev chrpath cmake file libffi-dev paxmark python2 zlib-dev"
subpackages="$pkgname-static $pkgname-libs $pkgname-dev"
source="https://llvm.org/releases/$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
	fix-memory-mf_exec-on-aarch64.patch

	rust-lang-llvm-pr47.patch
	rust-lang-llvm-pr53.patch
	rust-lang-llvm-pr54.patch
	rust-lang-llvm-pr55.patch
	rust-lang-llvm-pr57.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

	# Tests added by rust-lang-llvm-pr53.patch, fails for unknown reason.
	rm test/CodeGen/ARM/dbg-range-extension.mir
	rm test/DebugInfo/MIR/X86/livedebugvalues-limit.mir

	# Test added by rust-lang-llvm-pr57.patch, fails for unknown reason.
	rm test/CodeGen/MIR/AArch64/inst-size-tlsdesc-callseq.mir

	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

	make check-llvm
}

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 "$pkgdir"/usr/bin
	local name path
	for path in bin/*; do
		name=${path##*/}
		case "$name" in
			FileCheck | obj2yaml | yaml2obj) continue;;
		esac
		ln -s ../lib/llvm$_majorver/bin/$name "$pkgdir"/usr/bin/$name-$_majorver
	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"

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

libs() {
	pkgdesc="LLVM $_majorver runtime library"
	local soname="libLLVM-$_majorver.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() {
	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 $_prefix/bin/
	_mv "$pkgdir"/usr/bin/llvm-config-* usr/bin/
}

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

sha512sums="50cbe8ee911080f586e77861c442348701bd02e2de0c090c54c34f82ac275ecfcd712af0f41e387c33b4a6057778a4258a27554292fe68ab4af3fd9dd6d90683  llvm-3.9.1.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
e6d925ddc71f9f2ce8a859ac519dad51cba99c07129e378a5388bb1dd2f7d5b9d5ed392e85267fd20043789c7460a7d705eb8f970b2d130edbf5a934e9505ac4  fix-memory-mf_exec-on-aarch64.patch
a7c6056bfa3c2b76bbbc1a663ea84e5db6e269d5360afedaad5fdc3279d4732bc414e8c7d3a3f6f0d7b30ed81d8aec3fd2b35377f81db6d441b17b185d8b9bd0  rust-lang-llvm-pr47.patch
3c35bd342de6ec40aef9af8f18cb7d9aa1d2d8e04e9f320fff7df2c828f663cc12715d86946bc6bbc19f2e99b357a07f0fd9a4acce912c9c195c6837675847d5  rust-lang-llvm-pr53.patch
4f5418082b3bb0992a57f7abbd4187d119cf277a573f899b63af93522d823f9195a754adc56ea2a8fb2f5925b39eb82975b522c30cac275c71204cbe6d809271  rust-lang-llvm-pr54.patch
0e38a0390b07a0764bea68dd6a7ea78b9f7b5fd8e292cc7d11f46c0358d68bd40020ca24e0c486d1e74d2a957e1fe79fd3eb29b8ac73a1531b38606605babc43  rust-lang-llvm-pr55.patch
b9f952a71cb4f88f0657f0f2cf17b6102a303f6fab1845f3026d4889a6466b2746694752bc664228e25861abf05b76425a42f05ec4066f1b90cc6ee2deaf0a16  rust-lang-llvm-pr57.patch"