pkgname=clang
pkgver=19.1.6
pkgrel=2
pkgdesc="C language family frontend for LLVM"
arch=('x86_64')
url="https://clang.llvm.org/"
license=('Apache-2.0 WITH LLVM-exception')
depends=('llvm-libs' 'gcc' 'compiler-rt')
makedepends=('llvm' 'cmake' 'ninja' 'python-sphinx' 'python-myst-parser')
options=('!emptydirs')
source=(https://github.com/llvm/llvm-project/releases/download/llvmorg-${pkgver}/clang-${pkgver}.src.tar.xz
    https://github.com/llvm/llvm-project/releases/download/llvmorg-${pkgver}/clang-tools-extra-${pkgver}.src.tar.xz
    https://github.com/llvm/llvm-project/releases/download/llvmorg-${pkgver}/llvm-${pkgver}.src.tar.xz
    https://github.com/llvm/llvm-project/releases/download/llvmorg-${pkgver}/cmake-${pkgver}.src.tar.xz
    https://github.com/llvm/llvm-project/releases/download/llvmorg-${pkgver}/third-party-${pkgver}.src.tar.xz
    enable-fstack-protector-strong-by-default.patch)
sha256sums=(6358cbb3e14687ca2f3465c61cffc65589b448aaa912ec2c163ef9fc046e8a89
    417a7d0048d8eb62dbaa8461f1fd474eb6493b09e14d050b39cc1f051e8b71d1
    ad1a3b125ff014ded290094088de40efb9193ce81a24278184230b7d401f8a3e
    9c7ec82d9a240dc2287b8de89d6881bb64ceea0dcd6ce133c34ef65bda22d99e
    0e8048333bab2ba3607910e5d074259f08dccf00615778d03a2a55416718eb45
    ef319e65f927718e1d3b1a23c480d686b1d292e2a0bf27229540964f9734117a)

# Utilizing LLVM_DISTRIBUTION_COMPONENTS to avoid
# installing static libraries; inspired by Gentoo
_get_distribution_components() {
    local target
    ninja -C flarebird-build -t targets | grep -Po 'install-\K.*(?=-stripped:)' | while read -r target; do
        case ${target} in
            clang-libraries|distribution)
                continue
                ;;
            clang|clangd|clang-*)
                ;;
            clang*|findAllSymbols)
                continue
                ;;
        esac
        echo ${target}
    done
}

prepare() {
    rename -v -- "-${pkgver}.src" '' {cmake,third-party}-${pkgver}.src

    cd clang-${pkgver}.src

    mv ${srcdir}/clang-tools-extra-${pkgver}.src tools/extra

    patch -Np2 -i ${srcdir}/enable-fstack-protector-strong-by-default.patch

    # Fix hardcoded test path
    sed -i 's/clang-tools-extra/tools\/extra/g' tools/extra/test/clang-doc/enum.cpp
    sed -i 's/clang-tools-extra/tools\/extra/g' tools/extra/test/clang-doc/namespace.cpp
}

build() {
    cd clang-${pkgver}.src

    # Build only minimal debug info to reduce size
    CFLAGS=${CFLAGS/-g /-g1 }
    CXXFLAGS=${CXXFLAGS/-g /-g1 }

    local cmake_args=(
        -B flarebird-build
        -G Ninja
        -D CMAKE_BUILD_TYPE=Release
        -D CMAKE_INSTALL_PREFIX=/usr
        -D LLVM_LIBDIR_SUFFIX=64
        -D CMAKE_INSTALL_DOCDIR=share/doc
        -D CMAKE_SKIP_RPATH=ON
        -D CLANG_DEFAULT_PIE_ON_LINUX=ON
        -D CLANG_LINK_CLANG_DYLIB=ON
        -D ENABLE_LINKER_BUILD_ID=ON
        -D LLVM_BUILD_DOCS=ON
        -D LLVM_BUILD_TESTS=ON
        -D LLVM_ENABLE_RTTI=ON
        -D LLVM_ENABLE_SPHINX=ON
        -D LLVM_EXTERNAL_LIT=/usr/bin/lit
        -D LLVM_INCLUDE_DOCS=ON
        -D LLVM_LINK_LLVM_DYLIB=ON
        -D LLVM_MAIN_SRC_DIR="${srcdir}/llvm-${pkgver}.src"
        -D SPHINX_WARNINGS_AS_ERRORS=OFF
        -D CLANG_VENDOR=Flarebird
    )

    cmake ${cmake_args[@]}

    local distribution_components=$(`_get_distribution_components | paste -sd\;`)
    
    test -n ${distribution_components}
    cmake_args+=(-DLLVM_DISTRIBUTION_COMPONENTS=${distribution_components})

    cmake ${cmake_args[@]}

    ninja -C flarebird-build
}

_python_optimize() {
    python3 -m compileall "$@"
    python3 -O -m compileall "$@"
    python3 -OO -m compileall "$@"
}

package() {
    cd clang-${pkgver}.src

    DESTDIR=${pkgdir} ninja -C flarebird-build install

    # Remove documentation sources
    rm -r ${pkgdir}/usr/share/doc/clang{,-tools}/html/{_sources,.buildinfo}

    # Move scanbuild-py into site-packages and install Python bindings
    local site_packages=$(python3 -c "import site; print(site.getsitepackages()[0])")

    install -d ${pkgdir}/${site_packages}

    mv ${pkgdir}/usr/lib/{libear,libscanbuild} ${pkgdir}/${site_packages}/
    cp -a bindings/python/clang ${pkgdir}/${site_packages}/

#     ln -sv clang   ${pkgdir}/usr/bin/${CHOST}-clang
#     ln -sv clang++ ${pkgdir}/usr/bin/${CHOST}-clang++
}