# Contributor: Travis Tilley <ttilley@gmail.com>
# Maintainer: William Pitcock <nenolod@dereferenced.org>
pkgname=llvm
pkgver=3.6.0
pkgrel=2
pkgdesc="low level virtual machine compiler system"
arch="x86 x86_64 armhf"
url="http://llvm.org/"
license="UOI-NCSA"
depends=""
depends_dev="perl"
makedepends="$depends_dev cmake make flex bison groff musl-dev binutils-gold binutils-dev libffi-dev libxml2-dev libxml2-utils zlib-dev ncurses-dev python python-dev py-sphinx chrpath"
install=
subpackages="clang clang-doc:clang_doc $pkgname-dev $pkgname-doc $pkgname-libs"
source="http://llvm.org/releases/$pkgver/llvm-$pkgver.src.tar.xz
	http://llvm.org/releases/$pkgver/cfe-$pkgver.src.tar.xz
	http://llvm.org/releases/$pkgver/clang-tools-extra-$pkgver.src.tar.xz
	http://llvm.org/releases/$pkgver/compiler-rt-$pkgver.src.tar.xz
	llvm-0001-fix-shared-build.patch
	llvm-0002-musl-triple.patch
	llvm-0003-musl-hacks.patch
	compiler-rt-0001-musl-no-dlvsym.patch
	compiler-rt-0002-musl-no-sanitizers.patch
	clang-0001-fix-stdint.h.patch
	clang-0002-fix-unwind-header.patch
	clang-0003-add-alpine-linux-distro.patch
	clang-0004-alpine-use-z-relro.patch
	clang-0005-alpine-hash-style-gnu.patch
	clang-0006-musl-alpine-triple.patch
	clang-0007-musl-dynamic-linker-paths.patch
	clang-0008-alpine-PIE-by-default.patch
	clang-0009-pass-host-triple-to-compiler-rt.patch
	"

_builddir="$srcdir"/build
_bootstrap_prefix="$srcdir"/bootstrap

_srcdir="$srcdir"/"$pkgname-$pkgver.src"
_srcdir_clang="$_srcdir"/tools/clang
_srcdir_clang_extra="$_srcdir_clang"/tools/extra
# _srcdir_polly="$_srcdir"/tools/polly
_srcdir_compiler_rt="$_srcdir"/projects/compiler-rt
# _srcdir_libcxx="$_srcdir"/projects/libcxx


# get_libstdcxx_header_directories() {
# 	echo | \
# 	g++ -Wp,-v -x c++ - -fsyntax-only 2>&1 | \
# 	grep '^ /' | \
# 	head -2 | \
# 	sed 's|^ *||g' | \
# 	tr '\n' ';'
# }

# dynamically link to libstdc++ rather than statically link to libsupc++ even
# though that's all we need. If a program also needs to link against libstdc++,
# it will provide its own copy of libsupc++ and this can lead to subtle problems.
# NOTE: the define has changed name in the 3.7 tree to always be
# LIBCXX_ABI_INCLUDE_PATHS, even when using libsupc++.
# _cmake_libcxx_abi_flags="\
# 	-DLIBCXX_CXX_ABI=libstdc++ \
# 	-DLIBCXX_LIBSUPCXX_INCLUDE_PATHS=$(get_libstdcxx_header_directories) \
# "

# _cmake_libcxx_flags="\
# 	${_cmake_libcxx_abi_flags} \
# 	-DLIBCXX_HOST_TRIPLE=$CHOST \
# 	-DLIBCXX_TARGET_TRIPLE=$CBUILD \
# 	-DLIBCXX_ENABLE_ASSERTIONS=NO \
# "

_cmake_flags="\
	-DCMAKE_BUILD_TYPE=Release \
	-DCMAKE_VERBOSE_MAKEFILE=NO \
"

# the binutils include directory setting appears to be necessary in order to
# build the LLVMGold plugin, even if the headers are in /usr/include and easily
# detected.
# auto-detection of both go and ocaml are explicitly disabled here, as they
# currently do not compile.
_cmake_common_flags="\
	${_cmake_flags} \
	-DCOMPILER_RT_TEST_TARGET_TRIPLE=$CBUILD \
	-DLLVM_DEFAULT_TARGET_TRIPLE=$CBUILD \
	-DLLVM_HOST_TRIPLE=$CHOST \
	-DFFI_INCLUDE_DIR=$(pkg-config --cflags-only-I libffi | sed 's|^-I||g') \
	-DLIBXML2_INCLUDE_DIR=$(pkg-config --cflags-only-I libxml-2.0 | sed 's|^-I||g') \
	-DLLVM_BINUTILS_INCDIR=/usr/include \
	-DLLVM_ENABLE_ASSERTIONS=NO \
	-DLLVM_ENABLE_FFI=YES \
	-DLLVM_ENABLE_LIBCXX=NO \
	-DLLVM_ENABLE_PIC=YES \
	-DLLVM_ENABLE_ZLIB=YES \
	-DLLVM_ENABLE_RTTI=YES \
	-DGO_EXECUTABLE=GO_EXECUTABLE-NOTFOUND \
	-DOCAMLFIND=OCAMLFIND-NOTFOUND \
	-DCLANG_BUILD_EXAMPLES=NO \
	-DLLVM_BUILD_EXAMPLES=NO \
	-DLLVM_INCLUDE_EXAMPLES=NO \
"

# attempt to build the bootstrap compiler as quickly as is sane. unfortunately,
# there is no way to turn off ObjC support. we can, however, disable building
# ARCMT (automatic reference counting migration tool), the static analyzer, and
# documentation. also, since we're using the cmake build and not autotools, the
# tests aren't automatically built (targets for testing are emitted, just not
# built as part of the default target).
_cmake_bootstrap_flags="\
	${_cmake_common_flags} \
	-DCMAKE_INSTALL_PREFIX=${_bootstrap_prefix} \
	-DLLVM_TARGETS_TO_BUILD=host \
	-DBUILD_SHARED_LIBS=NO \
	-DCLANG_ENABLE_ARCMT=NO \
	-DCLANG_ENABLE_STATIC_ANALYZER=NO \
	-DCLANG_INCLUDE_DOCS=NO \
	-DLLVM_ENABLE_CXX1Y=NO \
	-DLLVM_ENABLE_SPHINX=NO \
	-DLLVM_ENABLE_TERMINFO=NO \
	-DLLVM_INCLUDE_DOCS=NO \
	-DLLVM_EXTERNAL_CLANG_TOOLS_EXTRA_BUILD=NO \
"

# setting compiler-rt to compile as if it were an external build allows it to
# use the freshly built clang to compile, rather than the bootstrap compiler.
# NOTE: there appears to be an issue building compiler-rt as an external project
# and using ninja as the build tool, so stick to good old fashioned makefiles.
_cmake_final_flags="\
	${_cmake_common_flags} \
	-DCMAKE_INSTALL_PREFIX=/usr \
	-DLLVM_TARGETS_TO_BUILD=all \
	-DLLVM_BUILD_EXTERNAL_COMPILER_RT=YES \
	-DBUILD_SHARED_LIBS=YES \
	-DLLVM_BUILD_DOCS=YES \
	-DLLVM_ENABLE_CXX1Y=YES \
	-DLLVM_ENABLE_SPHINX=YES \
	-DLLVM_ENABLE_TERMINFO=YES \
	-DLIBCLANG_BUILD_STATIC=YES \
"

prepare() {
	msg "Preparing LLVM project sources..."
	mv "$srcdir"/cfe-$pkgver.src \
	  "$_srcdir_clang" || return 1
	mv "$srcdir"/clang-tools-extra-$pkgver.src \
	  "$_srcdir_clang_extra" || return 1
	# TODO: polly requires isl 0.14.x
	# mv "$srcdir"/polly-$pkgver.src \
	#   "$_srcdir_polly" || return 1
	mv "$srcdir"/compiler-rt-$pkgver.src \
	  "$_srcdir_compiler_rt" || return 1
	# mv "$srcdir"/libcxx-$pkgver.src \
	#   "$_srcdir_libcxx" || return 1

	msg "Patching LLVM core..."
	cd "$_srcdir" || return 1
	update_config_sub || return 1
	sed -i -e '/case "\${UNAME_MACHINE}:\${UNAME_SYSTEM}:\${UNAME_RELEASE}:\${UNAME_VERSION}" in/i \' \
	       -e 'if [ x != "x$CBUILD" ]; then echo "$CBUILD"; exit; fi' \
		./autoconf/config.guess || return 1
	for i in $source; do
		case $i in
		llvm-*.patch)
			msg "Applying $i..."
			patch -s -p1 -N -i "$srcdir"/$i || return 1
			;;
		esac
	done

	msg "Patching clang..."
	cd "$_srcdir_clang" || return 1
	# FIXME: I have never seen these tests pass on any system, be it vanilla clang
	# or patched, musl or glibc, autoconf or cmake. It fails on alpine, gentoo,
	# and ubuntu.
	rm ./test/Driver/lto.c
	for i in $source; do
		case $i in
		clang-*.patch)
			msg "Applying $i..."
			patch -s -p1 -N -i "$srcdir"/$i || return 1
			;;
		esac
	done

	msg "Patching compiler-rt..."
	cd "$_srcdir_compiler_rt" || return 1
	for i in $source; do
		case $i in
		compiler-rt-*.patch)
			msg "Applying $i..."
			patch -s -p1 -N -i "$srcdir"/$i || return 1
			;;
		esac
	done

	# msg "Patching libc++..."
	# cd "$_srcdir_libcxx" || return 1
	# for i in $source; do
	# 	case $i in
	# 		libcxx-*.patch)
	# 			msg "Applying $i..."
	# 			patch -s -p1 -N -i "$srcdir"/$i || return 1
	# 			;;
	# 	esac
	# done
}

build() {
	# These flag settings are added to the existing cmake build flags rather
	# than replacing them, so we clear them out here to remove any abuild set
	# flags. For a Release build, the default flags will be "-O3 -NDEBUG".
	# -fno-devirtualize is added here because, to quote the fedora spec file,
	# "gcc has scary template-related bugs". the flag is removed post-bootstrap.
	CFLAGS=""
	CXXFLAGS="-fno-devirtualize"
	LDFLAGS=""
	: ${CC:=$(which gcc)}
	: ${CXX:=$(which g++)}

	# The cmake logic appears to use the result of config.guess in a few places
	# even though we override the various triple settings manually. export CBUILD
	# to the tweaked config.guess just to be safe.
	export CBUILD

	mkdir -p "$_builddir"
	cd "$_builddir"

	msg "Compiling bootstrap compiler"
	cmake -G "Unix Makefiles" -Wno-dev ${_cmake_bootstrap_flags} \
		-DCMAKE_C_COMPILER="${CC}" \
		-DCMAKE_CXX_COMPILER="${CXX}" \
		-DCMAKE_C_FLAGS="${CFLAGS}" \
		-DCMAKE_CXX_FLAGS="${CXXFLAGS}" \
		-DCMAKE_EXE_LINKER_FLAGS="${LDFLAGS}" \
		-DCMAKE_SHARED_LINKER_FLAGS="${LDFLAGS}" \
		"${_srcdir}" || return 1

	make || return 1
	make install || return 1

	CFLAGS=""
	CXXFLAGS=""
	CC="${_bootstrap_prefix}/bin/clang"
	CXX="${_bootstrap_prefix}/bin/clang++"

  cd ..
	rm -rf "$_builddir"
	mkdir -p "$_builddir"
	cd "$_builddir"

	msg "Compiling final compiler"
	cmake -G "Unix Makefiles" -Wno-dev ${_cmake_final_flags} \
		-DCMAKE_C_COMPILER="${CC}" \
		-DCMAKE_CXX_COMPILER="${CXX}" \
		-DCMAKE_C_FLAGS="${CFLAGS}" \
		-DCMAKE_CXX_FLAGS="${CXXFLAGS}" \
		-DCMAKE_EXE_LINKER_FLAGS="${LDFLAGS}" \
		-DCMAKE_SHARED_LINKER_FLAGS="${LDFLAGS}" \
		"${_srcdir}" || return 1

	make || return 1
	make check-llvm || return 1
	make check-clang || return 1
	# 27 failures, all related to clang-tidy
	# make check-clang-tools || return 1
	make check-compiler-rt || return 1
	# 172 test failures, so it's not included
	# make check-libcxx || return 1
}

package() {
	cd "$_builddir"
	make DESTDIR="$pkgdir" install

	rm "$pkgdir"/usr/lib/LLVMHello.so

	file "$pkgdir"/usr/lib/*.so | awk -F: '$2~/ELF/{print $1}' | xargs -r chrpath -d
	file "$pkgdir"/usr/bin/* | awk -F: '$2~/ELF/{print $1}' | xargs -r chrpath -d
}

clang() {
	pkgdesc="A C language family front-end for LLVM"

	mkdir -p "$subpkgdir"/usr/bin \
		"$subpkgdir"/usr/lib "$subpkgdir"/usr/share/clang "$subpkgdir"/usr/include
	mv "$pkgdir"/usr/bin/*clang* \
		"$subpkgdir"/usr/bin/ || return 1
	mv "$pkgdir"/usr/lib/clang \
		"$pkgdir"/usr/lib/libclang* \
		"$pkgdir"/usr/lib/libmodernize* \
		"$subpkgdir"/usr/lib/ || return 1
	mv "$pkgdir"/usr/include/clang "$pkgdir"/usr/include/clang-c \
		"$subpkgdir"/usr/include/ || return 1

	cp -r "$_srcdir"/tools/clang/tools/scan-build "$subpkgdir"/usr/share/clang/scan-build
	cp -r "$_srcdir"/tools/clang/tools/scan-view "$subpkgdir"/usr/share/clang/scan-view

	ln -s /usr/share/clang/scan-build/scan-build "$subpkgdir"/usr/bin/scan-build
	ln -s /usr/share/clang/scan-view/scan-view "$subpkgdir"/usr/bin/scan-view
}

clang_doc() {
	pkgdesc="clang documentation"
	mkdir -p "$subpkgdir"/usr/share/doc/ || return 1
	mv "$pkgdir"/usr/share/doc/clang "$subpkgdir"/usr/share/doc/ || return 1
}

libs() {
	pkgdesc="LLVM shared libraries"
	mkdir -p "$subpkgdir"/usr/lib/
	mv "$pkgdir"/usr/lib/*.so "$subpkgdir"/usr/lib/
}

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