gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//polly/lib/CodeGen/IslNodeBuilder.cpp",
    "//polly/lib/External/isl/GIT_HEAD_ID",
    "//polly/lib/External/isl/isl_ast_codegen.c",
    "//polly/lib/External/isl/test_inputs/codegen/polly2.c",
    "//polly/lib/External/isl/test_inputs/codegen/polly2.st",
    "//polly/test/CodeGen/empty_domain_in_context.ll"
  ],
  "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": []
}