# Description : Low Level Virtual Machine
# URL         : https://llvm.org/
# Maintainer  : KRAK3N Team
# Depends on  : zlib-ng zstd 

name=llvm
version=20.1.5
release=1
source=(https://github.com/${name}/${name}-project/releases/download/${name}org-${version}/${name}-project-${version}.src.tar.xz
	c89 c99
	0012-libc-libc-abi-libunwind-disable-multiarch-locations.patch
	0014-clang-disable-multiarch-layout-on-musl.patch
	0017-clang-use-as-needed-by-default.patch
	0024-clang-link-libcxxabi-on-linux-when-using-libc.patch
	compiler-rt-sanitizer-supported-arch.patch
	fix-msan-with-musl.patch
	musl-stack-size.patch
	musl-targets.patch)
no_strip=1

# llvm
build_opt="
	-DLLVM_BUILD_LLVM_DYLIB=ON
	-DLLVM_LINK_LLVM_DYLIB=ON
	-DLLVM_TARGETS_TO_BUILD='host;AMDGPU'
	-DLLVM_HOST_TRIPLE=x86_64-pc-linux-musl
	-DLLVM_INCLUDE_BENCHMARKS=OFF
	-DLLVM_INCLUDE_EXAMPLES=OFF
	-DLLVM_INCLUDE_DOCS=OFF
	-DLLVM_INCLUDE_TESTS=OFF
	-DLLVM_ENABLE_RUNTIMES='compiler-rt;libunwind;libcxx;libcxxabi'
	-DLLVM_ENABLE_PROJECTS='clang;clang-tools-extra;lld'
	-DLLVM_ENABLE_RTTI=ON
	-DLLVM_ENABLE_EH=ON
	-DLLVM_ENABLE_LIBXML2=OFF
	-DLLVM_ENABLE_LIBCXX=ON
	-DLLVM_ENABLE_RTTI=ON
	-DLLVM_ENABLE_LLD=ON
	-DLLVM_INSTALL_BINUTILS_SYMLINKS=ON
	-DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON"

# clang
build_opt="$build_opt
	-DCLANG_BUILD_EXAMPLES=OFF
	-DCLANG_INCLUDE_DOCS=OFF
	-DCLANG_INCLUDE_TESTS=OFF
	-DLIBCLANG_BUILD_STATIC=ON
	-DCLANG_DEFAULT_RTLIB=compiler-rt
	-DCLANG_DEFAULT_UNWINDLIB=libunwind
	-DCLANG_DEFAULT_CXX_STDLIB=libc++
	-DCLANG_CONFIG_FILE_SYSTEM_DIR=/etc/clang
	-DCLANG_LINK_CLANG_DYLIB=Yes"

# libcxx
build_opt="$build_opt
	-DLIBCXX_HAS_MUSL_LIBC=ON
	-DLIBCXX_CXX_ABI=libcxxabi
	-DLIBCXX_USE_COMPILER_RT=ON
	-DLIBCXX_HAS_ATOMIC_LIB=No
	-DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=OFF"
	
# libcxxabi
build_opt="$build_opt
	-DLIBCXXABI_USE_LLVM_UNWINDER=ON
	-DLIBCXXABI_USE_COMPILER_RT=ON
	-DLIBCXXABI_ENABLE_STATIC_UNWINDER=OFF"
	
# libunwind
build_opt="$build_opt
	-DLIBUNWIND_HAS_NODEFAULTLIBS_FLAG=OFF
	-DLIBUNWIND_USE_COMPILER_RT=ON
	-DLIBUNWIND_ENABLE_ASSERTIONS=OFF"

# compiler-rt
build_opt="$build_opt
	-DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON
	-DCOMPILER_RT_INCLUDE_TESTS=OFF
	-DCOMPILER_RT_BUILD_SANITIZERS=ON
	-DCOMPILER_RT_BUILD_GWP_ASAN=OFF"
	
# etc
build_opt="$build_opt
	-DMLIR_INSTALL_AGGREGATE_OBJECTS=OFF
	$([ -e /usr/bin/ccache ] && echo '-DLLVM_CCACHE_BUILD=ON')
"


build() {
	cd llvm-project-${version}.src/llvm

	for p in $SRC/*.patch; do
		patch -Np1 -d .. -i $p
	done

	export CFLAGS="$CFLAGS -fPIC"
	export CXXFLAGS="$CXXFLAGS -fPIC"
	
	mkdir -p cmakebuild
	cd cmakebuild
	cmake \
		-DCMAKE_INSTALL_PREFIX=/usr \
		-DCMAKE_INSTALL_SYSCONFDIR=/etc \
		-DCMAKE_INSTALL_LIBEXECDIR=lib/clang \
		-DCMAKE_BUILD_TYPE=Release \
		-DFETCHCONTENT_FULLY_DISCONNECTED=ON \
		-DCMAKE_C_FLAGS_RELEASE="$CFLAGS" \
		-DCMAKE_CXX_FLAGS_RELEASE="$CXXFLAGS" \
		$build_opt \
		-B build ..
	cmake --build build
	DESTDIR=$PKG cmake --install build
	
	ln -s lld $PKG/usr/bin/ld
	ln -s clang $PKG/usr/bin/cc
	ln -s clang $PKG/usr/bin/gcc
	ln -s clang $PKG/usr/bin/cpp
	ln -s clang++ $PKG/usr/bin/c++
	ln -s clang++ $PKG/usr/bin/g++
	install -m755 $SRC/c89 $PKG/usr/bin/c89
	install -m755 $SRC/c99 $PKG/usr/bin/c99
}