gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/thread",
    "//libcxx/test/benchmarks/atomic_wait.bench.cpp",
    "//libcxx/test/benchmarks/atomic_wait_vs_mutex_lock.bench.cpp",
    "//libcxx/test/benchmarks/stop_token.bench.cpp",
    "//libcxx/test/libcxx/thread/thread.stoptoken/atomic_unique_lock.pass.cpp",
    "//libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp",
    "//libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp",
    "//libcxx/test/std/thread/thread.semaphore/max.pass.cpp",
    "//libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/is_array.pass.cpp",
    "//libcxx/utils/ci/docker-compose.yml"
  ],
  "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": []
}