gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/CMakeLists.txt",
    "//libcxx/include/__functional/bind.h",
    "//libcxx/include/__memory_resource/polymorphic_allocator.h",
    "//libcxx/include/__mutex/once_flag.h",
    "//libcxx/include/__thread/thread.h",
    "//libcxx/include/__tuple/make_tuple_types.h",
    "//libcxx/include/__tuple/tuple_element.h",
    "//libcxx/include/__tuple/tuple_indices.h",
    "//libcxx/include/__utility/integer_sequence.h",
    "//libcxx/include/__utility/pair.h",
    "//libcxx/include/bitset",
    "//libcxx/include/future",
    "//libcxx/include/module.modulemap.in",
    "//libcxx/include/mutex",
    "//libcxx/include/scoped_allocator",
    "//libcxx/include/tuple",
    "//libcxx/include/variant",
    "//libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp",
    "//llvm/utils/gn/secondary/libcxx/include/BUILD.gn"
  ],
  "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