PATCH RFA: Implement -Wenum-compare for C

[Ian Lance Taylor]

Manuel López-Ibáñez <lopezibanez@gmail.com> writes:

> 2009/4/1 Ian Lance Taylor <iant@google.com>:
>>
>> Is that patch OK to commit to mainline?
>>
>
> +  /* Warn about comparisons of different enum types.  */
> +  if (warn_enum_compare
> +      && TREE_CODE_CLASS (code) == tcc_comparison
> +      && TREE_CODE (type1) == ENUMERAL_TYPE
> +      && TREE_CODE (type2) == ENUMERAL_TYPE
> +      && TYPE_MAIN_VARIANT (type1) != TYPE_MAIN_VARIANT (type2))
> +    warning (OPT_Wenum_compare,
> +	     "comparison between %qT and %qT",
> +	     type1, type2);
> +
>
> IMHO patches adding new warnings should use explicit locations where
> possible (warning_at), particularly if the correct location is
> available. (I am not sure about the latter in this case because the
> patch does not use "diff -p". In any case, even warning_at
> (input_location) should be always better than warning().

Thanks for the comment.  The function conviently already has a LOCATION
parameter, so I have changed the code to the following.

Ian


  /* Warn about comparisons of different enum types.  */
  if (warn_enum_compare
      && TREE_CODE_CLASS (code) == tcc_comparison
      && TREE_CODE (type1) == ENUMERAL_TYPE
      && TREE_CODE (type2) == ENUMERAL_TYPE
      && TYPE_MAIN_VARIANT (type1) != TYPE_MAIN_VARIANT (type2))
    warning_at (location, OPT_Wenum_compare,
		"comparison between %qT and %qT",
		type1, type2);