gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//flang/lib/Optimizer/Transforms/AddDebugInfo.cpp",
    "//mlir/include/mlir-c/Dialect/LLVM.h",
    "//mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td",
    "//mlir/lib/CAPI/Dialect/LLVM.cpp",
    "//mlir/lib/Target/LLVMIR/DebugImporter.cpp",
    "//mlir/lib/Target/LLVMIR/DebugTranslation.cpp",
    "//mlir/test/CAPI/llvm.c",
    "//mlir/test/Target/LLVMIR/Import/debug-info.ll",
    "//mlir/test/Target/LLVMIR/llvmir-debug.mlir"
  ],
  "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": []
}