https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63140
--- Comment #5 from Ralf Hoffmann <gcc at boomerangsworld dot de> --- Thanks for the feedback, I am also suspecting I have some problem in my code regarding undefined behavior. What I do for testing is to compile my tool Worker (http://www.boomerangsworld.de/cms/worker/index.html, version 3.5.0) with make clean LDFLAGS="-fsanitize=undefined" CPPFLAGS="-fsanitize=undefined" ./configure make and then start the program (src/worker), click on top left "A" button for the about dialog and click on the down arrow to scroll down the option list. It then either works, or the process hangs in the endless loop. I tried to use "-fsanitize=undefined" and it actually makes a difference. There is no compiler output pointing out some problem and also no runtime output when reaching the test point mentioned above. But with this option, it behaves normally and the endless loop does not occur. When using the options -fno-strict-overflow or -fno-aggressive-loop-optimizations the problem still occurs. I would like to help bisecting the compiler if you could give me a hint where to start. As far as I see, there is no git repo which would make it easier.
