http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50103
--- Comment #2 from Sri <murthys at us dot ibm.com> 2011-08-17 17:00:34 UTC --- Hi Richard: Thank you for your response. I looked at the documentation for xlc and by default the optimizations are turned off http://publib.boulder.ibm.com/infocenter/comphelp/v111v131/index.jsp?topic=/com.ibm.xlc111.aix.doc/compiler_ref/opt_strict.html Defaults -qnooptimize or -O0 or -qoptimize=0 Please let me know if you have more suggestion to resolve this issue.