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c.f. bug 424647
List Archive: gentoo-amd64
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To: gentoo-amd64@g.o
From: Jared Lindsay <cinder.sub@...>
Subject: Re: x86_64 optimization patches for glibc.
Date: Sun, 24 Jul 2005 11:13:11 -0700
Well, I tried compiling the libm patch with the new version
(2.3.5-r1), but got the same error.  And I think I would get the same
error if I went through what you did...o.O

Guess it is a lost cause, for now :(

On 7/24/05, Simon Strandman <simon.strandman@...> wrote:
> Jared Lindsay skrev:
> 
> >Back on to a different subject...has anyone looked at the libm
> >section?  I am curious as to how much of a performance increase that
> >would add if we can get it working.
> >
> >
> >
> 
> Getting it to work seems easier said than done. :( Has anyone else tried
> compiling it? For me it always fails to build. I've tried upgrading
> binutils to 2.16.91.0.1 (same version as mdk cooker), building without
> the gentoo patches, building without omitfp, enabling as-needed,
> building without various configure options, using the libm patch from
> suse instead of mandrake and with higher or lower optimizations. It
> didn't even work when I manually unpacked and compiled glibc with only
> the libm patches and configure options --prefix=/usr/
> --enable-add-ons=nptl. Checking out the latest glibc from the 2.3 stable
> branch via cvs and adding the patches to that didn't work either. I'm
> running out of ideas now!
> 
> Here is the error it fails with:
> 
> x86_64-pc-linux-gnu-gcc -Wl,-O1  -nostdlib -nostartfiles -r -o
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc_pic.os
> \
>  -Wl,-d -Wl,--whole-archive
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc_pic.a
> x86_64-pc-linux-gnu-gcc -Wl,-O1  -shared -Wl,-O1 \
>   -nostdlib -nostartfiles \
>    -Wl,-dynamic-linker=/lib64/ld-linux-x86-64.so.2 -Wl,-z,relro \
>   -Wl,--verbose 2>&1 | \
>   sed >
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/shlib.ldsT
> \
>       -e '/^=========/,/^=========/!d;/^=========/d' \
>       -e 's/^.*\.hash[  ]*:.*$/  .note.ABI-tag : { *(.note.ABI-tag) } &/' \
>       -e 's/^.*\*(\.dynbss).*$/& \
>          PROVIDE(__start___libc_freeres_ptrs = .); \
>          *(__libc_freeres_ptrs) \
>          PROVIDE(__stop___libc_freeres_ptrs = .);/'\
>       -e 's/^.*\*(\.jcr).*$/& \
>          PROVIDE(__start___libc_subfreeres = .);\
>          __libc_subfreeres : { *(__libc_subfreeres) }\
>          PROVIDE(__stop___libc_subfreeres = .);\
>          PROVIDE(__start___libc_atexit = .);\
>          __libc_atexit : { *(__libc_atexit) }\
>          PROVIDE(__stop___libc_atexit = .);\
>          PROVIDE(__start___libc_thread_subfreeres = .);\
>          __libc_thread_subfreeres : { *(__libc_thread_subfreeres) }\
>          PROVIDE(__stop___libc_thread_subfreeres = .);/'
> mv -f
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/shlib.ldsT
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/shlib.lds
> x86_64-pc-linux-gnu-gcc -Wl,-O1  -shared -static-libgcc -Wl,-O1
> -Wl,-z,defs -Wl,-dynamic-linker=/lib64/ld-linux-x86-64.so.2
> -B/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/csu/
> 
> -Wl,--version-script=/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.map
> -Wl,-soname=libc.so.6 -Wl,-z,relro -nostdlib -nostartfiles -e
> __libc_main -Wl,-z,now
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/math
> 
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/elf
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/dlfcn
> 
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/nss
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/nis
> 
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/rt
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/resolv
> 
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/crypt
> -L/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/nptl
> 
> -Wl,-rpath-link=/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/math:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/elf:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/dlfcn:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/nss:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/nis:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/rt:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/resolv:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/crypt:/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/nptl
> 
> -o
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.so
> -T
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/shlib.lds
> 
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/csu/abi-note.o
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/elf/soinit.os
> 
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc_pic.os
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/elf/sofini.os
> 
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/elf/interp.os
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/elf/ld.so
> -lgcc
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc_pic.os:
> In function `scalbn':
> : undefined reference to `__copysign'
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc_pic.os:
> In function `__scalbnf':
> : undefined reference to `__copysignf'
> /var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc_pic.os:
> In function `__scalbnf':
> : undefined reference to `__copysignf'
> collect2: ld returned 1 exit status
> make[1]: ***
> [/var/tmp/portage/glibc-2.3.5/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.so]
> Error 1
> make[1]: Leaving directory `/var/tmp/portage/glibc-2.3.5/work/glibc-2.3.5'
> make: *** [all] Error 2
> 
> I've looked through some of the other mandrake and suse patches but the
> only patch mandrake has that contains the word "copysign" is the gcc4
> patch. Using it makes the error slightly different but it still happens
> at the same place:
> 
> /usr/portage/distfiles/glibc.build/libc_pic.os: In function `__scalbn':
> ../sysdeps/ieee754/dbl-64/s_scalbn.c:61: undefined reference to `__copysign'
> /usr/portage/distfiles/glibc.build/libc_pic.os: In function `__scalbnf':
> ../sysdeps/ieee754/flt-32/s_scalbnf.c:52: undefined reference to
> `__copysignf'
> ../sysdeps/ieee754/flt-32/s_scalbnf.c:58: undefined reference to
> `__copysignf'
> collect2: ld returned 1 exit status
> 
> 
> --
> Simon Strandman <simon.strandman@...>
> 
> --
> gentoo-amd64@g.o mailing list
> 
>

-- 
gentoo-amd64@g.o mailing list


References:
x86_64 optimization patches for glibc.
-- Simon Strandman
Re: x86_64 optimization patches for glibc.
-- Matt Randolph
Re: x86_64 optimization patches for glibc.
-- Matt Randolph
Re: x86_64 optimization patches for glibc.
-- Sean Johnson
Re: x86_64 optimization patches for glibc.
-- Matt Randolph
Re: x86_64 optimization patches for glibc.
-- Ian McCulloch
Re: x86_64 optimization patches for glibc.
-- Jared Lindsay
Re: x86_64 optimization patches for glibc.
-- Simon Strandman
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Updated Jun 17, 2009

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