José Luis García Pallero <jgpallero@xxxxxxxxx> writes:
> As a curiosity, gcc 4.5.1 compiled by myself for my ppc debian emits a
> warning of the type "conversion to size_t from int may change the
> sign" for the code
>
> size_t var=0;
> var = strspn("hello","lo");
> var = (size_t)strspn("hello","lo");
>
> where strspn returns a size_t type
> (http://linux.die.net/man/3/strspn). The warning appears in both
> cases. But the warning only appears with the flag -Wconversion
> combined with -O3/-O2 or -O1 optimizations. Apparently, in this
> version some warnings depends on the level of optimization.
> Attached I send the example files
I would guess that on your system strspn is a macro when you compile
with optimization. Try using the --save-temps option with -O and look
at what your call to strspn turns into. Something in the expanded macro
is triggering the warning.
Ian
