FROM scratch AS base
ENV VERSION=18.1.8
ENV SRC_HASH=0b58557a6d32ceee97c8d533a59b9212d87e0fc4d2833924eb6c611247db2f2a
ENV SRC_FILE=llvm-project-${VERSION}.src.tar.xz
ENV SRC_SITE=https://github.com/llvm/llvm-project/releases/download/llvmorg-${VERSION}/${SRC_FILE}

FROM base AS fetch
ADD --checksum=sha256:${SRC_HASH} ${SRC_SITE} .

FROM fetch AS build
COPY --from=stagex/busybox . /
COPY --from=stagex/binutils . /
COPY --from=stagex/cmake . /
COPY --from=stagex/ninja . /
COPY --from=stagex/musl . /
COPY --from=stagex/gcc . /
COPY --from=stagex/python . /
COPY --from=stagex/py-setuptools . /
COPY --from=stagex/openssl . /
COPY --from=stagex/gcc . /
COPY --from=stagex/clang . /
COPY --from=stagex/llvm . /
COPY --from=stagex/zlib . /

RUN tar -xf ${SRC_FILE}
WORKDIR /llvm-project-${VERSION}.src
RUN <<-EOF
    set -eux
    CFLAGS="-O2 -DNDEBUG -g1" \
    CXXFLAGS="-O2 -DNDEBUG -g1" \
    CC=clang \
    CXX=clang++ \
    cmake \
        -S lld \
        -B build \
        -G Ninja \
        -Wno-dev \
        -DCMAKE_BUILD_TYPE=None \
        -DCMAKE_INSTALL_PREFIX=/usr/ \
        -DCMAKE_SKIP_INSTALL_RPATH=ON \
        -DBUILD_SHARED_LIBS=ON \
        -DLLVM_EXTERNAL_LIT=/usr/lib/llvm18/bin/lit \
        -DLLVM_INCLUDE_TESTS=OFF \
        -DLLD_BUILT_STANDALONE=ON \
        -DCMAKE_EXE_LINKER_FLAGS="-Wl,-z,stack-size=2097152"
    cmake --build build
EOF

FROM build AS install
RUN --network=none DESTDIR="/rootfs" cmake --install build

FROM stagex/filesystem AS package
COPY --from=install /rootfs/. /