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[Bug c++/42810] Enumeration with sequential values has its for-loop exit condition optimized out.
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 27 Jan 2010 21:10:12 -0000
- Subject: [Bug c++/42810] Enumeration with sequential values has its for-loop exit condition optimized out.
- References: <bug-42810-18694@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #20 from pinskia at gcc dot gnu dot org 2010-01-27 21:10 -------
(In reply to comment #19)
> Try:
Actually that code is defined as signed char++ is defined to be signed char =
(signed char) ((int)i + 1); by the C/C++ promotion rules.
#include <stdio.h>
main()
{
for (signed i = 1 ; i >= -2 ; i++)
{
printf( "%d ", i);
}
}
---- CUT ---
That will cause different behavior at different optimization levels.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42810