gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//flang-rt/README.md",
    "//flang/CMakeLists.txt",
    "//flang/cmake/modules/AddFlangOffloadRuntime.cmake",
    "//flang/examples/CMakeLists.txt",
    "//flang/examples/ExternalHelloWorld/CMakeLists.txt",
    "//flang/runtime/CMakeLists.txt",
    "//flang/runtime/CUDA/CMakeLists.txt",
    "//flang/runtime/Float128Math/CMakeLists.txt",
    "//flang/test/CMakeLists.txt",
    "//flang/test/lit.cfg.py",
    "//flang/test/lit.site.cfg.py.in",
    "//flang/tools/f18/CMakeLists.txt",
    "//flang/unittests/CMakeLists.txt",
    "//flang/unittests/Evaluate/CMakeLists.txt",
    "//flang/unittests/Runtime/CMakeLists.txt",
    "//flang/unittests/Runtime/CUDA/CMakeLists.txt",
    "//llvm/CMakeLists.txt"
  ],
  "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": []
}