[PATCH] Remove __SIZE_TYPE__ usage (BZ 33969)

[Adhemerval Zanella Netto]

On 10/03/26 20:07, Joseph Myers wrote:
> On Tue, 10 Mar 2026, Adhemerval Zanella wrote:
> 
>> The ‘fcntl-linux.h’ and ‘cdefs.h’ changes are straightforward
>> because size_t is already defined.  The glob.h change uses
>> stddef.h as other installed headers.
> 
> Could you give more details of your analysis for <sys/cdefs.h>, for what 
> headers under what feature test macros use any of the relevant macros from 
> <sys/cdefs.h>?  (Since certainly <sys/cdefs.h> is used in lots of 
> installed headers that don't and can't define size_t in standard C modes, 
> so the question is when the particular macros therein that would use 
> size_t themselves get used.)
> 

The  __SIZE_TYPE__ is used solely for fortify support, which itself adds
additional constrains of what compiler needs to provide (__GNUC_,
__USE_EXTERN_INLINES, __fortify_function). Also, some of the fortify 
wrappers themselves add an implicit requirement of size_t.

But I have not fully check whether this would potentially cause a break,
at least bmg with --full-gcc does not trigger any regression.

I might remove this change from the patch, but it seems to be inconsistent
to still require __SIZE_TYPE__ for some conditional support.  Should we
close BZ 33969 as notabug?