On Fri, May 26, 2017 at 01:46:47PM +0200, Richard Biener wrote: > On Thu, May 25, 2017 at 11:23 AM, Martin Liška <mli...@suse.cz> wrote: > > Hello. > > > > After a discussion with Richi, using adding "-O2" to STAGE1 cflags with a > > recent > > enough compiler can significantly speed up bootstrap. Thus I'm suggesting to > > introduce --with-stage1-cflags where one can provide such options. > > I don't think this is necessary -- you can always override with STAGE1_CFLAGS. > > > Apart from that, maybe it would be handy to automatically enable "-O2" when > > one has a recent compiler? Do we have an example where we detect host > > compiler > > and it's version? > > Don't know about version but configury already detects that we use GCC, so > that > knowledge should be readily available.
Well, it certainly shouldn't be -O2 by default for any system GCC, more something like if it is major of the configured configure minus 1 or newer (or minus 2?), then use -O2, otherwise default to -O0 as before. Jakub