gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/CMakeLists.txt",
    "//libcxx/include/__cxx03/__thread/support/pthread.h",
    "//libcxx/include/__cxx03/cctype",
    "//libcxx/include/__cxx03/cerrno",
    "//libcxx/include/__cxx03/cfenv",
    "//libcxx/include/__cxx03/cfloat",
    "//libcxx/include/__cxx03/cinttypes",
    "//libcxx/include/__cxx03/complex.h",
    "//libcxx/include/__cxx03/cstddef",
    "//libcxx/include/__cxx03/cstdio",
    "//libcxx/include/__cxx03/ctype.h",
    "//libcxx/include/__cxx03/cwctype",
    "//libcxx/include/__cxx03/errno.h",
    "//libcxx/include/__cxx03/ext/__hash",
    "//libcxx/include/__cxx03/fenv.h",
    "//libcxx/include/__cxx03/float.h",
    "//libcxx/include/__cxx03/inttypes.h",
    "//libcxx/include/__cxx03/stdbool.h",
    "//libcxx/include/__cxx03/stddef.h",
    "//libcxx/include/__cxx03/stdio.h",
    "//libcxx/include/__cxx03/tgmath.h",
    "//libcxx/include/__cxx03/wchar.h",
    "//libcxx/include/__cxx03/wctype.h",
    "//libcxx/include/complex.h",
    "//libcxx/include/ctype.h",
    "//libcxx/include/errno.h",
    "//libcxx/include/fenv.h",
    "//libcxx/include/float.h",
    "//libcxx/include/inttypes.h",
    "//libcxx/include/stdbool.h",
    "//libcxx/include/stddef.h",
    "//libcxx/include/stdio.h",
    "//libcxx/include/tgmath.h",
    "//libcxx/include/wctype.h",
    "//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