Hello Andrew, * Andrew W. Nosenko wrote on Wed, Mar 30, 2011 at 02:01:45AM CEST: > On Tue, Mar 29, 2011 at 20:18, Ralf Wildenhues wrote: > > > > In order to be absolutely sure that the compiler can't optimize away the > > reference, I'd say you need to modify external state depending on it. > > Typically, you can do that by printing its contents, or, if those aren't > > well-defined (so the compiler might warn about that), its address (with > > %lu and cast to unsigned long, for portability). Of course this means > > the test needs to include AC_INCLUDES_DEFAULT in the test header, for > > stdio.h. The latter means you can then drop including sys/types another > > time. > > IMHO, better would to be just disable a compiler to do optimization > dances around 'in6' variable (i.e. mark 'in6' as 'volatile'): Ah yes, that sounds simpler. I've been too preoccupied with Fortran again lately, it seems. Thanks, Ralf _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
