From: Kevin S. Van Horn (kevin.vanhorn_at_[hidden])
Date: 2002-03-01 14:16:52
The tools file for gcc appears to use -O4 for "optimize for speed", and
-O2 for "optimize for size". The documentation I have for gcc (from gcc
3.0.4) lists no -O4 flag whatsoever, although there is a -O3 flag. It
says that -O2 performs "nearly all supported optimizations that do not
involve a space-speed tradeoff", and states that -Os is "optimize for
size".