Messages in this thread | | | Date | Wed, 14 Dec 2005 19:40:06 -0500 | From | Dave Jones <> | Subject | Re: [2.6 patch] offer CC_OPTIMIZE_FOR_SIZE only if EXPERIMENTAL |
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On Wed, Dec 14, 2005 at 11:28:13PM +0100, Jesper Juhl wrote:
> I should probably back this up with *why* it boggles my mind. > > -Os has been in EMBEDDED for ages, so it's not been tested by the > majority of users with the wide range of compilers etc that people > use.
Fedora has had this enabled most of the time for x86, x86-64, ia64, s390, s390x, ppc32 and ppc64 for a long time. From time to time when a gcc bug has been tickled it's been disabled again until its been worked out, but for the most part, it's been a complete non-event wrt regressions. In the ~2 years that we've had it enabled I recall 2-3 occasions where it broke something badly (and it was really noticable, like "networking doesn't work any more", or "x86-64 stopped booting"[1]), and once or twice when moving to a newer gcc point release, it tripped an ICE.
The RHEL4 kernel has also been built this way since day 1.
Dave
[1] In that particular case, it was broken asm-x86-64/ macros that just happened to work at -O2 by chance, so it actually found latent bugs.
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