gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/__config",
    "//libcxx/include/__filesystem/path.h",
    "//libcxx/include/__filesystem/u8path.h",
    "//libcxx/include/__locale",
    "//libcxx/include/__locale_dir/locale_base_api.h",
    "//libcxx/include/__math/gamma.h",
    "//libcxx/include/__ostream/print.h",
    "//libcxx/include/fstream",
    "//libcxx/include/print",
    "//libcxx/include/text_encoding",
    "//libcxx/include/wchar.h",
    "//libcxx/src/chrono.cpp",
    "//libcxx/src/filesystem/directory_iterator.cpp",
    "//libcxx/src/filesystem/error.h",
    "//libcxx/src/filesystem/file_descriptor.h",
    "//libcxx/src/filesystem/filesystem_clock.cpp",
    "//libcxx/src/filesystem/format_string.h",
    "//libcxx/src/filesystem/operations.cpp",
    "//libcxx/src/filesystem/path.cpp",
    "//libcxx/src/filesystem/path_parser.h",
    "//libcxx/src/filesystem/posix_compat.h",
    "//libcxx/src/filesystem/time_utils.h",
    "//libcxx/src/fstream.cpp",
    "//libcxx/src/include/aligned_alloc.h",
    "//libcxx/src/include/config_elast.h",
    "//libcxx/src/iostream.cpp",
    "//libcxx/src/locale.cpp",
    "//libcxx/src/print.cpp",
    "//libcxx/src/std_stream.h",
    "//libcxx/src/system_error.cpp",
    "//libcxx/src/thread.cpp",
    "//libcxx/test/support/count_new.h"
  ],
  "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": []
}
running all tests due to change to blacklisted file