gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/CMakeLists.txt",
    "//libcxx/include/__bit/bit_ceil.h",
    "//libcxx/include/__bit/bit_floor.h",
    "//libcxx/include/__bit/bit_log2.h",
    "//libcxx/include/__bit/bit_width.h",
    "//libcxx/include/__bit/countl.h",
    "//libcxx/include/__bit/countr.h",
    "//libcxx/include/__bit/has_single_bit.h",
    "//libcxx/include/__bit/popcount.h",
    "//libcxx/include/__bit/rotate.h",
    "//libcxx/include/__concepts/arithmetic.h",
    "//libcxx/include/__format/format_arg_store.h",
    "//libcxx/include/__mdspan/extents.h",
    "//libcxx/include/__numeric/saturation_arithmetic.h",
    "//libcxx/include/__type_traits/integer_traits.h",
    "//libcxx/include/__type_traits/is_integral.h",
    "//libcxx/include/__type_traits/is_signed_integer.h",
    "//libcxx/include/__type_traits/is_unsigned_integer.h",
    "//libcxx/include/__utility/cmp.h",
    "//libcxx/include/module.modulemap.in",
    "//libcxx/test/libcxx/concepts/concepts.arithmetic/__libcpp_integer.compile.pass.cpp",
    "//libcxx/test/libcxx/concepts/concepts.arithmetic/__libcpp_signed_integer.compile.pass.cpp",
    "//libcxx/test/libcxx/concepts/concepts.arithmetic/__libcpp_unsigned_integer.compile.pass.cpp",
    "//llvm/utils/gn/secondary/libcxx/include/BUILD.gn"
  ],
  "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": []
}
running all tests due to change to blacklisted file