Gentoo Archives: gentoo-amd64

From: "Hemmann
To: gentoo-amd64@l.g.o
Subject: Re: [gentoo-amd64] Re: Old topic comes round again: -Ox optimizations.
Date: Thu, 03 Nov 2005 17:42:49
Message-Id: 200511031841.16707.volker.armin.hemmann@tu-clausthal.de
In Reply to: [gentoo-amd64] Re: Old topic comes round again: -Ox optimizations. by Duncan <1i5t5.duncan@cox.net>
1 On Thursday 03 November 2005 16:27, Duncan wrote:
2 > Hemmann, Volker Armin posted
3 > <200511031222.04016.volker.armin.hemmann@××××××××××××.de>, excerpted
4 >
5 > below, on Thu, 03 Nov 2005 12:22:03 +0100:
6 > > Os is 'forbidden' for glibc, because there were some gcc bugs, that
7 > > miscompiled glibc with Os.
8 >
9 > I've actually run an -Os compiled glibc here (hacked the ebuild to
10 > remove the filterflags/replaceflags/stripflags calls) for some time, no
11 > noticed issues (tho I haven't tried it with gcc-4.x yet).
12 >
13 > However, it's unsupported, and because glibc is linked by virtually
14 > everything, I couldn't be sure whether problems I might have were due to
15 > it or not. The thing that switched me back was attempting to trace down
16 > why xorg had quite responding to CTRL-ALT-Fx VT-switch commands. I later
17 > found out it was a known issue with that version on some configs, fixed in
18 > a later version, but glibc is too big a compile (expecially when it's
19 > compiled twice, once for 32-bit and once for 64-bit, up to four times for
20 > those poor folks running nptl without nptl-only, just the two compiles
21 > here, with a dual Opteron, is long, can't imagine four compiles on a
22 > single CPU...
23
24 it is not so bad with a co and without ntplonly
25 genlop -t glibc
26 * sys-libs/glibc
27
28 Sat Sep 24 07:51:46 2005 >>> sys-libs/glibc-2.3.5-r1
29 merge time: 1 hour, 14 minutes and 49 seconds.
30
31 Tue Oct 4 23:12:51 2005 >>> sys-libs/glibc-2.3.5-r1
32 merge time: 1 hour, 18 minutes and 56 seconds.
33
34 Fri Oct 7 04:43:40 2005 >>> sys-libs/glibc-2.3.5-r2
35 merge time: 1 hour, 53 minutes and 50 seconds.
36
37 Fri Oct 28 05:52:35 2005 >>> sys-libs/glibc-2.3.5-r3
38 merge time: 1 hour, 36 minutes and 1 second.
39
40 --
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