https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32040
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Suma Sharma from comment #2) > (In reply to comment #1) > > This works as designed. > > > > > Thank you for your reply. > Please confirm whether it is expected behaviour (that means it is not a bug). > > But it was also observed that > 1. there is a difference in result when compiled with -O0 option(with all > -O2 flags enabled) and compiled with -O2 ? > 2. there is a difference in result when compiled with -O2 option(with all > -O2 flags disabled) and compiled with -O0 ? There is a define which is defined when using -O1 and above (__OPTIMIZED__), the GNU libc uses that define to define some inline function versions of the standard functions.
