gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/flat_map",
    "//libcxx/include/flat_set",
    "//libcxx/include/module.modulemap.in",
    "//libcxx/test/configs/cmake-bridge.cfg.in",
    "//libcxx/test/libcxx/lit.local.cfg",
    "//libcxx/test/std/iterators/iterator.range/mandatory_inclusions.gen.py"
  ],
  "test_targets": [
    "//clang-tools-extra/clangd/test:check-clangd",
    "//clang-tools-extra/test:check-clang-tools",
    "//clang/test:check-clang",
    "//compiler-rt/test/hwasan:check-hwasan",
    "//lld/test:check-lld",
    "//llvm/test:check-llvm"
  ],
  "additional_compile_targets": []
}