message: c++11 is the default for all compilers (Xcode 10.1+) that Apple is currently allowing you to submit iOS apps to the app store with, so get rid of the unnecessary flag.
diff: @@ -310,7 +310,7 @@ def tf_copts(android_optimization_level_override = "-O2", is_external = False):
  clean_dep("//tensorflow:android"): android_copts,
  clean_dep("//tensorflow:macos"): [],
  clean_dep("//tensorflow:windows"): get_win_copts(is_external),
  - clean_dep("//tensorflow:ios"): ["-std=c++11"],
  + clean_dep("//tensorflow:ios"): [],
  clean_dep("//tensorflow:no_lgpl_deps"): ["-D__TENSORFLOW_NO_LGPL_DEPS__", "-pthread"],
  "//conditions:default": ["-pthread"],
  })
  