------- Comment #9 from edwintorok at gmail dot com 2009-04-25 14:22 -------
(In reply to comment #6)
> No, not if it is inlined (and if not you can as well use memcpy).
>
> You can also do (GCC extension)
>
> union union_t {
> unsigned un;
> char c[4];
> };
>
> unsigned bar(char *x)
> {
> union union_t u;
> u.c[0] = x[0];
> u.c[1] = x[1];
> u.c[2] = x[2];
> u.c[3] = x[3];
> return u.un;
> }
>
> but that will even generate worse code with GCC than the
> memcpy (it's even horrible code).
Hmm, looks like the only way out is for me to put #if defined(__GNUC__) &&
(__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4) and use memcpy.
Either that or add a configure rule to add -fno-strict-aliasing.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39895
