src_name=llvm
git_commit=8784c51c371a2ac3f5bba509786930bf32e97f34
git_url0=http://llvm.org/git/llvm.git

src_dir=$src_dir_root/$src_name
pkg_dir=$pkgs_dir_root/$pkg_name
rm -Rf $pkg_dir
mkdir -p $pkgs_dir_root
cp -r $src_dir $pkg_dir

cd $pkg_dir

git checkout --force $git_commit
git reset --hard

build_dir=$builds_dir_root/$pkg_name-$target_gnu_triple
rm -Rf $build_dir
mkdir -p $build_dir
cd $build_dir

export PKG_CONFIG_LIBDIR=
export PKG_CONFIG_SYSROOT_DIR=$target_sysroot

OLD_PATH=$PATH
export PATH=$cross_toolchain_dir_root/bin:$sdk_cmake_path/bin:$sdk_ninja_path/bin:$PATH

cmake	-G Ninja																										\
	"-DCMAKE_C_COMPILER=$target_gnu_triple-gcc"																						\
	"-DCMAKE_C_FLAGS=-pipe -O2 -fPIC -static-libgcc -static-libstdc++ -B$target_sysroot/nyan/glibc/current/lib -L$target_sysroot/nyan/glibc/current/lib -Wl,-rpath-link,$target_sysroot/nyan/glibc/current/lib"		\
	"-DCMAKE_CXX_COMPILER=$target_gnu_triple-g++"																						\
	"-DCMAKE_CXX_FLAGS:STRING=-pipe -O2 -fPIC -static-libgcc -static-libstdc++ -B$target_sysroot/nyan/glibc/current/lib -L$target_sysroot/nyan/glibc/current/lib -Wl,-rpath-link,$target_sysroot/nyan/glibc/current/lib"	\
	-DPYTHON_EXECUTABLE=$sdk_python3_path/bin/python3																					\
	-DCMAKE_INSTALL_PREFIX=/nyan/llvm/0																							\
	-DCMAKE_BUILD_TYPE=Release																								\
	-DLLVM_TARGETS_TO_BUILD=AMDGPU																								\
	-DLLVM_INCLUDE_TESTS=off																								\
	-DLLVM_ENABLE_PEDANTIC=off																								\
	-DLLVM_PARALLEL_COMPILE_JOBS=2000																							\
	-DLLVM_PARALLEL_LINK_JOBS=2000																								\
	-DLLVM_BUILD_UTILS=off																									\
	$pkg_dir	

cmake --build . -- -j $threads_n
# ninja does not know of DESTDIR, the llvm-config gets ignore the sysroot anyway and will be useless on the target machine
cmake -DCMAKE_INSTALL_PREFIX=$target_sysroot/nyan/llvm/0 -P ./cmake_install.cmake 

# cleanup and tidying
# we get rid of llvm binaries and install our version of llvm-config for static linking hack (only mesa) with sysroot friendlyness
rm -Rf $target_sysroot/nyan/$src_name/0/share
rm -f $target_sysroot/nyan/$src_name/0/bin/*
cp -f $nyan_root/builders/$pkg_name/llvm-config $target_sysroot/nyan/$src_name/0/bin/
find $target_sysroot/nyan/$src_name/0 -type f -name '*.la' | xargs rm -f
find $target_sysroot/nyan/$src_name/0 -type f | while read f; do if file $f | egrep 'ELF.+(shared|executable)' >/dev/null; then $target_gnu_triple-strip -s $f; fi; done

rm -Rf $build_dir $pkg_dir
export PATH=$OLD_PATH