Thanks for the reply. On the other hand, it seems that PPL and Cloog are auto-detected by configure; shouldn't that be enough to dynamically modify what -O3 does (or perhaps enable -O4)? On a related point, having used my old build script to build gcc I, of course, didn't read the prerequisites section. I have to rebuild right?
David On Thu, 2009-04-23 at 15:57 +0000, Joseph S. Myers wrote: > On Thu, 23 Apr 2009, David Ronis wrote: > > > >From the info pages it seems that the new optimizations, > > -floop-interchange, -floop-strip-mine, and -floop-block, are NOT turned > > on when -O3 is specified. Is this correct and if so, why aren't they? > > Because the behavior of -O3 must not depend on whether optional libraries > are linked into GCC, and we did not decide to make PPL and CLooG required > to build GCC, so -O3 cannot enable any optimizations using optional > libraries. >
