gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/cmake/config-ix.cmake",
    "//libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp",
    "//libcxx/test/std/time/time.clock/time.clock.hires/now.pass.cpp",
    "//libcxx/test/std/time/time.clock/time.clock.system/from_time_t.pass.cpp",
    "//libcxx/test/std/time/time.clock/time.clock.system/now.pass.cpp",
    "//libcxx/test/std/time/time.clock/time.clock.system/to_time_t.pass.cpp",
    "//libcxx/test/std/time/time.point/time.point.nonmember/op_-duration.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": []
}