TERMUX_PKG_HOMEPAGE=http://clang.llvm.org/
TERMUX_PKG_DESCRIPTION="C and C++ frontend for the LLVM compiler"
_PKG_MAJOR_VERSION=3.9
TERMUX_PKG_VERSION=${_PKG_MAJOR_VERSION}.1
TERMUX_PKG_REVISION=1
TERMUX_PKG_SRCURL=http://llvm.org/releases/${TERMUX_PKG_VERSION}/llvm-${TERMUX_PKG_VERSION}.src.tar.xz
TERMUX_PKG_SHA256=1fd90354b9cf19232e8f168faf2220e79be555df3aa743242700879e8fd329ee
TERMUX_PKG_HOSTBUILD=true
TERMUX_PKG_RM_AFTER_INSTALL="bin/macho-dump bin/bugpoint bin/llvm-tblgen lib/BugpointPasses.so lib/LLVMHello.so"
TERMUX_PKG_DEPENDS="binutils, ncurses, ndk-sysroot, ndk-stl, libgcc"
# Replace gcc since gcc is deprecated by google on android and is not maintained upstream.
TERMUX_PKG_CONFLICTS=gcc
TERMUX_PKG_REPLACES=gcc
# We would like to use LLVM_LINK_LLVM_DYLIB instead of BUILD_SHARED_LIBS,
# as http://llvm.org/docs/CMake.html says
# "BUILD_SHARED_LIBS is only recommended for use by LLVM developers. If you want
# to build LLVM as a shared library, you should use the LLVM_BUILD_LLVM_DYLIB option."
# and using fewer shared libraries will make it easier to split up llvm from clang.
# But switching to LLVM_LINK_LLVM_DYLIB currently causes linker errors.
TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
-DLLVM_ENABLE_PIC=ON
-DLLVM_BUILD_TESTS=OFF
-DLLVM_INCLUDE_TESTS=OFF
-DCLANG_INCLUDE_TESTS=OFF
-DCLANG_TOOL_C_INDEX_TEST_BUILD=OFF
-DBUILD_SHARED_LIBS=ON
-DPYTHON_EXECUTABLE=`which python2.7`
-DLLVM_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/llvm-tblgen
-DCLANG_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/clang-tblgen"
TERMUX_PKG_FORCE_CMAKE=yes

termux_step_post_extract_package () {
	CLANG_SRC_TAR=cfe-${TERMUX_PKG_VERSION}.src.tar.xz
	test ! -f $TERMUX_PKG_CACHEDIR/$CLANG_SRC_TAR && termux_download http://llvm.org/releases/${TERMUX_PKG_VERSION}/$CLANG_SRC_TAR \
		$TERMUX_PKG_CACHEDIR/$CLANG_SRC_TAR \
		e6c4cebb96dee827fa0470af313dff265af391cb6da8d429842ef208c8f25e63

	tar -xf $TERMUX_PKG_CACHEDIR/$CLANG_SRC_TAR -C tools
	mv tools/cfe-${TERMUX_PKG_VERSION}.src tools/clang

	export CMAKE_INSTALL_ALWAYS=1
}

termux_step_host_build () {
	cmake -G "Unix Makefiles" $TERMUX_PKG_SRCDIR \
		-DLLVM_BUILD_TESTS=OFF \
		-DLLVM_INCLUDE_TESTS=OFF
	make -j $TERMUX_MAKE_PROCESSES clang-tblgen llvm-tblgen
}

termux_step_pre_configure () {
	cd $TERMUX_PKG_BUILDDIR
	LLVM_DEFAULT_TARGET_TRIPLE=$TERMUX_HOST_PLATFORM
	if [ $TERMUX_ARCH = "arm" ]; then
		LLVM_TARGET_ARCH=ARM
		# See https://github.com/termux/termux-packages/issues/282
		LLVM_DEFAULT_TARGET_TRIPLE="armv7a-linux-androideabi"
	elif [ $TERMUX_ARCH = "aarch64" ]; then
		LLVM_TARGET_ARCH=AArch64
	elif [ $TERMUX_ARCH = "i686" ]; then
		LLVM_TARGET_ARCH=X86
	elif [ $TERMUX_ARCH = "x86_64" ]; then
		LLVM_TARGET_ARCH=X86
	else
		echo "Invalid arch: $TERMUX_ARCH"
		exit 1
	fi
        # see CMakeLists.txt and tools/clang/CMakeLists.txt
	TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" -DLLVM_DEFAULT_TARGET_TRIPLE=$LLVM_DEFAULT_TARGET_TRIPLE"
	TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" -DLLVM_TARGET_ARCH=$LLVM_TARGET_ARCH	-DLLVM_TARGETS_TO_BUILD=$LLVM_TARGET_ARCH"
}

termux_step_post_make_install () {
	cd $TERMUX_PREFIX/bin

	for tool in clang clang++ cc c++ cpp gcc g++ ${TERMUX_HOST_PLATFORM}-{clang,clang++,gcc,g++,cpp}; do
		ln -f -s clang-${_PKG_MAJOR_VERSION} $tool
	done
}