gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//.github/workflows/libcxx-build-and-test.yaml",
    "//flang/lib/Optimizer/Builder/FIRBuilder.cpp",
    "//flang/unittests/Optimizer/Builder/FIRBuilderTest.cpp",
    "//libcxx/docs/index.rst",
    "//libcxx/test/std/language.support/support.exception/propagation/make_exception_ptr.objc.pass.mm"
  ],
  "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": []
}