gecko-dev/build/build-clang/clang-12-mingw.json

{
    "stages": "4",
    "pgo" : true,
    "build_libcxx": true,
    "build_type": "Release",
    "assertions": false,
    "cc": "{MOZ_FETCHES_DIR}/gcc/bin/gcc",
    "cxx": "{MOZ_FETCHES_DIR}/gcc/bin/g++",
    "as": "{MOZ_FETCHES_DIR}/gcc/bin/gcc",
    "patches": [
    ]
}