# Contributor: Travis Tilley <ttilley@gmail.com>
# Maintainer: Travis Tilley <ttilley@gmail.com>
pkgname=llvm
pkgver=3.6.1
pkgrel=2
use_svn="false"
pkgdesc="low level virtual machine compiler system"
arch="all"
url="http://llvm.org/"
license="UOI-NCSA"
depends=""
depends_dev="perl"
makedepends="$depends_dev cmake make flex bison groff musl-dev binutils-dev libffi-dev libxml2-dev libxml2-utils zlib-dev ncurses-dev python python-dev py-sphinx chrpath"
[ "${use_svn}" = "true" ] && makedepends="$makedepends subversion"
install=
subpackages="clang clang-doc:clang_doc $pkgname-dev $pkgname-doc $pkgname-libs"
source="
	llvm-0001-fix-shared-build.patch
	llvm-0002-musl-triple.patch
	llvm-0003-musl-hacks.patch
	compiler-rt-0001-musl-no-dlvsym.patch
	compiler-rt-0002-musl-no-sanitizers.patch
	compiler-rt-0003-off_t.patch
	clang-0001-fix-stdint.h.patch
	clang-0002-fix-unwind-header.patch
	clang-0003-add-alpine-linux-distro.patch
	clang-0004-alpine-use-z-relro.patch
	clang-0005-alpine-hash-style-gnu.patch
	clang-0006-musl-alpine-triple.patch
	clang-0007-musl-dynamic-linker-paths.patch
	clang-0008-alpine-PIE-by-default.patch
	clang-0009-pass-host-triple-to-compiler-rt.patch
	"
if [ "${use_svn}" != "true" ]; then
	source="$source
		http://llvm.org/releases/$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"
fi


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


_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="\
	${_cmake_flags} \
	-DLLVM_DEFAULT_TARGET_TRIPLE=$CBUILD \
	-DLLVM_HOST_TRIPLE=$CHOST \
	-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 \
	-DLIBXML2_INCLUDE_DIR=/usr/include/libxml2 \
"

# 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 \
"


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


prepare() {
	if [[ "${use_svn}" = "true" ]]; then
		pkgsvnver="tags/RELEASE_${pkgver//./}/final/"
		svn_source="http://llvm.org/svn/llvm-project"
		cd "$srcdir"
		svn co "$svn_source/llvm/$pkgsvnver" llvm-$pkgver.src
		svn co "$svn_source/cfe/$pkgsvnver" cfe-$pkgver.src
		svn co "$svn_source/clang-tools-extra/$pkgsvnver" clang-tools-extra-$pkgver.src
		svn co "$svn_source/compiler-rt/$pkgsvnver" compiler-rt-$pkgver.src
	fi


	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
	mv "$srcdir"/compiler-rt-$pkgver.src \
	  "$_srcdir_compiler_rt" || 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
}

build() {
	# cmake is funky. it uses several flag related settings in addition to picking
	# up what's in the CFLAGS/CXXFLAGS env variables. to make using any abuild-set
	# flags sane, we pass them in as options to cmake and unset the environment
	# variables. we also back up the original flags so that we can tweak them
	# without losing the original setting (see below re: -fno-devirtualize).
	orig_cflags="${CFLAGS}"
	orig_cxxflags="${CXXFLAGS}"
	unset CFLAGS
	unset CXXFLAGS

	# just in case those were set to blank strings, we _really_ want to make sure
	# we're not building what will effectively be a -O0 build here...
	test -z "${orig_cflags}" && orig_cflags="-O3"
	test -z "${orig_cxxflags}" && orig_cxxflags="-O3"

	# -fno-devirtualize is added here because, to quote the fedora spec file,
	# "gcc has scary template-related bugs". the flag is removed post-bootstrap.
	# -DNDEBUG is required to disable assertions
	cflags="${orig_cflags} -DNDEBUG"
	cxxflags="${orig_cxxflags} -DNDEBUG -fno-devirtualize"

	# 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

	# cmake doesn't call out to pkg-config to determine the include path for FFI,
	# and since alpine installs the headers to a versioned directory cmake can't
	# auto-detect it by guessing either.
	ffi_include_dir="$(pkg-config --cflags-only-I libffi | sed 's|^-I||g')"


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

	msg "Compiling bootstrap compiler"
	cmake -G "Unix Makefiles" -Wno-dev ${_cmake_bootstrap_flags} \
		-DCMAKE_C_FLAGS_RELEASE="${cflags}" \
		-DCMAKE_CXX_FLAGS_RELEASE="${cxxflags}" \
		-DCMAKE_EXE_LINKER_FLAGS="${LDFLAGS}" \
		-DCMAKE_SHARED_LINKER_FLAGS="${LDFLAGS}" \
		-DFFI_INCLUDE_DIR="$ffi_include_dir" \
		"${_srcdir}" || return 1

	make || return 1
	make install || return 1

	cflags="${orig_cflags} -DNDEBUG"
	cxxflags="${orig_cxxflags} -DNDEBUG"
	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="${CXX}" \
		-DCMAKE_C_FLAGS_RELEASE="${cflags}" \
		-DCMAKE_CXX_FLAGS_RELEASE="${cxxflags}" \
		-DCMAKE_EXE_LINKER_FLAGS="${LDFLAGS}" \
		-DCMAKE_SHARED_LINKER_FLAGS="${LDFLAGS}" \
		-DFFI_INCLUDE_DIR="$ffi_include_dir" \
		"${_srcdir}" || return 1

	make || return 1

	# llvm tests don't run under PaX, almost certainly due to MCJIT
	# TODO: detect when running a vanilla kernel and run all tests
	# make check-llvm || return 1

	make check-clang || return 1

	# 27 failures, all related to clang-tidy.
	# clang-format/clang-modernize and friends pass their test suites
	# make check-clang-tools || return 1

	make check-compiler-rt || 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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d10fc3574c560ccfae3eeacdc4a988f2  llvm-0002-musl-triple.patch
056178d87918d531f531b1b765a59e7c  llvm-0003-musl-hacks.patch
346081b2f0825ca7f491155c4b3ca0ea  compiler-rt-0001-musl-no-dlvsym.patch
eb3797555357896a92f74bf1bacfbdc2  compiler-rt-0002-musl-no-sanitizers.patch
8bc11d4a60af51a7fc10643bd0970d3a  compiler-rt-0003-off_t.patch
eab0123372fa909817ed21cfcffdbe16  clang-0001-fix-stdint.h.patch
069f5cd7a6d0b01eade62bb72aac9e8b  clang-0002-fix-unwind-header.patch
93ffbede80bc857c8ae6bed5ff016a52  clang-0003-add-alpine-linux-distro.patch
231fad6dc619ef6a54567c14082bf7af  clang-0004-alpine-use-z-relro.patch
2967fea7ed0624d99808bc091be1bab4  clang-0005-alpine-hash-style-gnu.patch
2848c592e5388069b7f4785085193078  clang-0006-musl-alpine-triple.patch
e24a82edcd6caa5e405ff67a45d6befc  clang-0007-musl-dynamic-linker-paths.patch
6bc4b7047042f9afec452a97c35c2cd5  clang-0008-alpine-PIE-by-default.patch
0ae0c5939c27750c52b39158fbc7a7a9  clang-0009-pass-host-triple-to-compiler-rt.patch
ebf9e97be405ae126e134d3a357cd58a  llvm-3.6.1.src.tar.xz
9ff6811757735051f8651833b22ae014  cfe-3.6.1.src.tar.xz
1ad810536f0f7fefd4541a907aff83b3  clang-tools-extra-3.6.1.src.tar.xz
6f204b1feb324b1672ac907b32d927c0  compiler-rt-3.6.1.src.tar.xz"
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c7612168defefcb35cc8c988ff8b519aa983f07a62fd3b2c67f7d468459ca48a  clang-0007-musl-dynamic-linker-paths.patch
39c275490e3360d50fe339406992616fad0fa9127204c9b93578ee2403ae850c  clang-0008-alpine-PIE-by-default.patch
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121c048fe60bccccd4a188a18613c94e1e1d9abd8fbae6405d23418f0c9b3562fff72fe77aea9bc0f8632ec9ad89503b9c67fcab5bf378001f90ad7492a1845a  compiler-rt-3.6.1.src.tar.xz"