build

#!/bin/sh -e

sed 's/set(COMPILER_RT_HAS_SANITIZER_COMMON TRUE)/set(COMPILER_RT_HAS_SANITIZER_COMMON FALSE)/' compiler-rt/cmake/config-ix.cmake > _
mv -f _ compiler-rt/cmake/config-ix.cmake

export DESTDIR="$1"
cmake -B build \
    -DCMAKE_C_COMPILER=clang \
    -DCMAKE_CXX_COMPILER=clang++ \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_BUILD_TYPE=Release \
    -DLLVM_BUILD_LLVM_DYLIB=ON \
    -DLLVM_LINK_LLVM_DYLIB=ON \
    -DLLVM_TARGETS_TO_BUILD="host;AMDGPU" \
    -DLLVM_ENABLE_PROJECTS="clang;compiler-rt;libunwind;libcxxabi;libcxx;lld" \
    -DLLVM_ENABLE_RTTI=ON \
    -DLLVM_ENABLE_EH=ON \
    -DLLVM_ENABLE_TERMINFO=OFF \
    -DLLVM_ENABLE_LIBXML2=OFF \
    -DLLVM_ENABLE_LIBEDIT=OFF \
    -DLLVM_ENABLE_ZLIB=OFF \
    -DLLVM_HOST_TRIPLE="$(clang -dumpmachine)" \
    -DLLVM_INCLUDE_BENCHMARKS=OFF \
    -DLLVM_INCLUDE_EXAMPLES=OFF \
    -DLLVM_INCLUDE_DOCS=OFF \
    -DLLVM_INCLUDE_TESTS=OFF \
    -DLLVM_ENABLE_LIBCXX=ON \
    -DLLVM_ENABLE_LLD=ON \
    -DLLVM_INSTALL_BINUTILS_SYMLINKS=ON \
    -DLIBUNWIND_USE_COMPILER_RT=ON \
    -DLIBCXXABI_USE_LLVM_UNWINDER=ON \
    -DLIBCXXABI_USE_COMPILER_RT=ON \
    -DLIBCXXABI_ENABLE_STATIC_UNWINDER=ON \
    -DLIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY=ON \
    -DLIBCXXABI_ENABLE_SHARED=OFF \
    -DLIBCXX_CXX_ABI=libcxxabi \
    -DLIBCXX_USE_COMPILER_RT=ON \
    -DLIBCXX_HAS_MUSL_LIBC=ON \
    -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON \
    -DLIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY=ON \
    -DLIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY=ON \
    -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON \
    -DCOMPILER_RT_EXCLUDE_ATOMIC_BUILTIN=OFF \
    -DCLANG_DEFAULT_CXX_STDLIB=libc++ \
    -DCLANG_DEFAULT_RTLIB=compiler-rt \
    -Wno-dev llvm

cmake --build build
cmake --install build

# libc++abi header files
mkdir -p "$1/usr"
cp -r libcxxabi/include "$1/usr"

# LLD: Replace GNU binutils
ln -s ld.lld "$1/usr/bin/ld"

# Clang: Some legacy programs may require cc
ln -s clang "$1/usr/bin/cc"

# Clang: equivalent for c++
ln -s clang++ "$1/usr/bin/c++"

# Clang: equivalent for cpp
ln -s clang-cpp "$1/usr/bin/cpp"

# Clang: POSIX compliance
cp -f c99 "$1/usr/bin/c99"

# Clang: Override libexec, the path is hardcoded, unfortunately.
mv -f \
    "$1/usr/libexec/"*analyze* \
    "$1/usr/libexec/"*intercept* \
    "$1/usr/lib/clang"

rmdir "$1/usr/libexec"

sed "s|libexec|lib/clang|" "$1/usr/bin/scan-build" > _
mv -f _ "$1/usr/bin/scan-build"
chmod +x "$1/usr/bin/scan-build"