Marshall Lake <mlake@xxxxxxxxx> writes: > I have an application which compiles cleanly (on i386 Linux using > options -g -O2 -pedantic -I../include -Wall `pkg-config --cflags > gtk+-2.0`) and executes cleanly using gcc versions 4.1.2 and earlier > (I've tried 3.4.1, 4.0.2 & 4.1.2). > > But starting with version 4.1.3 (I've tried 4.1.3 & 4.2.1) my > application compiles cleanly but does not execute properly. I'm > having a very difficult time trying to pinpoint the exact cause. The > change in execution is subtle but affects the same area of the > application everytime. > > I've tried to locate a CHANGES file for 4.1.3 to no avail. Can > someone point me to one? That may give me some insight. > > Also, I see on http://gcc.gnu.org/ that it indicates the latest > version in the 4.1.x series is 4.1.2. Is that correct or in error? That is correct. There is no gcc 4.1.3 release. I don't know what code you are using. Since you mention 4.2.1, the list of changes in the gcc 4.2 series can be found here: http://gcc.gnu.org/gcc-4.2/changes.html . If you can't figure out why code is not executing properly, a good thing to try is -fno-strict-aliasing. Another is -fno-strict-overflow. If either of those options fixes the problem, then it is likely that your code is accidentally relying on undefined behaviour. Ian
