On 06/17/2011 04:21 AM, Andy Wingo wrote: > wingo@badger:/tmp$ gcc -O1 -o test foo.c > wingo@badger:/tmp$ ./test; echo $? > 1 > wingo@badger:/tmp$ gcc -O3 -o test foo.c > wingo@badger:/tmp$ ./test; echo $? > 0
If I understand correctly, 0 is a correct result, just not optimal. Improvements for getting the optimal result in spite of gcc optimizations are welcome (the more we can determine at compile time, the less work we have to do at runtime), but any correctly written program should already handle the case of an indeterminate compile-time probe (the probe should return 1 or -1 for known directions, and 0 for undetermined direction). -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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