gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/lib/abi/CHANGELOG.TXT",
    "//libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist",
    "//libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist",
    "//libcxx/src/CMakeLists.txt",
    "//libcxxabi/lib/cxxabiv1.exp",
    "//libcxxabi/lib/fundamental-types.exp",
    "//libcxxabi/lib/itanium-base.exp",
    "//libcxxabi/lib/itanium-exceptions.exp",
    "//libcxxabi/lib/new-delete.exp",
    "//libcxxabi/lib/std-exceptions.exp",
    "//libcxxabi/lib/std-misc.exp",
    "//libcxxabi/src/CMakeLists.txt",
    "//libcxxabi/test/uncaught_exception.pass.cpp"
  ],
  "test_targets": [
    "//clang-tools-extra/clangd/test:check-clangd",
    "//clang-tools-extra/test:check-clang-tools",
    "//clang/test:check-clang",
    "//lld/test:check-lld",
    "//llvm/test:check-llvm"
  ],
  "additional_compile_targets": []
}