Gentoo Archives: gentoo-dev

From: Prashanth Aditya Susarla <aditya@×××××××.in>
To: gentoo-dev@g.o
Subject: [gentoo-dev] Re: GCC3.1 bootstrap fails
Date: Sun, 02 Jun 2002 12:43:22
1 >do -not- use -fomit-frame-pointer during bootstrap! (can anyone who
2 >actually got this to -work- using omit-frame-pointer speak up??)
3 >
4 >This causes breakage in glibc.
6 That's interesting. When I used default-1.0, I used all the flags which
7 one particular FAQ on mentioned (-fforce-addr
8 -fomit-frame-pointer -funroll-loops blah blah blah along with -march=i686
9 -O3 of course) and everything worked fine (atleast compiled fine though I
10 was not truly happy with the performance (lots of memory leaks and
11 subsequent crashes of kswapd primarily). So maybe this is an issue only
12 with gcc-3.x and/or binutils-2.12.x. But I toned down the optimizations
13 and the bootstrap worked fine.
15 >this is due to a broken glibc (omit frame pointer and -O3. I think glibc
16 >strips out -O3 but not the -f flags. )
18 gcc does this. glibc retains whatever you specify. Anyway, that's beside
19 the point - only for the sake of information ;-).
21 >> problem is that most binaries segfault soon after glibc is built.
22 >Try again with -O2 -pipe and you will get a working system :)
24 Infact, I finally used the default options for Athlon systems (-march=i686
25 -pipe -O3.... not -O2 but -O3) and glibc didn't break. As I said earlier,
26 this is strange because all those crazy optimizations worked in the case
27 of the default-1.0 profile.
29 >emerge system
30 >/(watch it break down and cry in xfree because you overoptimized)
32 So you're saying that if I use -march=athlon-tbird -fomit-frame-pointer
33 -O3 [-pipe] -mmmx -m3dnow (the latter only for the sake of multimedia apps
34 like xmms, mplayer etc.) the xfree ebuild b0rks out? That's too bad,
35 really. And the thing with xfree is that experimenting stops being an
36 option if the very first emerge itself doesn't work :-(. Not all of us
37 have all the time in the world...
39 Regards,
40 Prashanth Aditya Susarla


Subject Author
Re: [gentoo-dev] Re: GCC3.1 bootstrap fails Bart Verwilst <verwilst@g.o>