Description of problem: I downloaded a opengl source tutorial from http://nehe.gamedev.net/data/lessons/linuxsdl/lesson40.tar.gz and compiled it twice. The first time with the default Makefile as provided in the tarball. The program then worked as described in the tutorial, a simulation of a string fell down the ground and came to a standstill. I then edited the Makefile and replaced -g with -O2 and recompiled. When running the program the string never settled but instead I got chaotic motion. It thus appears that there is an optimization bug that causes numeric instability of this particualar program. Version-Release number of selected component (if applicable): gcc-4.3.2-7.src.rpm How reproducible: Every time. Steps to Reproduce: 1. wget http://nehe.gamedev.net/data/lessons/linuxsdl/lesson40.tar.gz 2. tar -xf lesson40.tar.gz 3. cd lesson40_linux_sdl 4. make 5. ./lesson40 6. perl -pi~ -e 's/-g/-O2/' Makefile 7. make clean 8. make 9. ./lesson40 Actual results: The second run of lesson40 yields chaotic motion. Expected results: The second run of lesson40 should give identical result to the first run. Additional info:
I gave a look at this test case on every Fedora we support but on every particular one it looked the same -- rope settling down pixel by pixel. Can you still reproduce it? What about F-11/Rawhide? Can you make a OGV from the motion?
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I just tested it with Fedora 12 and it has been solved.