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From: | Justin Patrin |
Subject: | Re: [Monotone-devel] Problems after building monotone |
Date: | Thu, 20 Jul 2006 10:13:33 -0700 |
On 7/19/06, Zack Weinberg <address@hidden> wrote:
See if you can reproduce at -O0. -O3 most definitely *is* an extreme optimization setting[1], and I'm pretty sure we have -fno-strict-aliasing in the default CFLAGS for a reason. [I don't know what it is, though, and I was wondering if it could be taken out myself...]
The manual compile I did most certainly didn't have anything but the default optimization in monotone's build scripts. I've tried both 0.25 and 0.27 at -O0 and it made no difference. -O3 worked fine before for 0.25. Could it be my boost or gcc versions? They were both likely updated since I originally installed monotone.
zw [1] Anything other than -O0 or -O2 (and more recently -Os) is tested orders of magnitude less thoroughly than those few modes. Also, as a general piece of advice, -O3 almost always produces code that is both larger and slower than what you get at -O2, especially with gcc 3.x.
-- Justin Patrin
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