[Bug middle-end/19515] [4.0 Regression] Violation of C99 6.7.8 §21 for unions

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2005-01-20 09:15 -------
> From expr.c:count_type_elements: 
>  
>     case UNION_TYPE: 
>     case QUAL_UNION_TYPE: 
>       { 
>         /* Ho hum.  How in the world do we guess here?  Clearly it isn't 
>            right to count the fields.  Guess based on the number of words.  */ 
>         HOST_WIDE_INT n = int_size_in_bytes (type); 
>         if (n < 0) 
>           return -1; 
>         return n / UNITS_PER_WORD; 
>       } 
>  
> So we cannot use count_type_elements in gimplify_init_constructor. 

Can't we compute the result for unions based on the type of the first member?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19515