http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54337
nbhargava at google dot com changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #28062|0 |1 is obsolete| | --- Comment #3 from nbhargava at google dot com 2012-08-21 00:04:10 UTC --- Created attachment 28063 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28063 Linux-compatible test case $ time g++ -O3 -c t2.cc real 0m22.806s user 0m22.390s sys 0m0.330s $ time g++ -O0 -c t2.cc real 0m2.357s user 0m2.260s sys 0m0.050s On both Linux and Mac, this type of discrepancy exists.