https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67014

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |ipa
                 CC|                            |marxin at gcc dot gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-06-04

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
tolower is defined in the header file as:
extern __inline __attribute__ ((__gnu_inline__)) int
__attribute__ ((__nothrow__ , __leaf__)) tolower (int __c)
{
  return __c >= -128 && __c < 256 ? (*__ctype_tolower_loc ())[__c] : __c;
}


So __builtin_tolower is not using that inline function. So this is a front-end
issue where the the two function decls are not being merged into one or is an
inliner issue.

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