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Date: Mon, 29 Oct 2012 23:34:39 +0400
From: "Dmitry V. Levin" <ldv@...linux.org>
To: owl-dev@...ts.openwall.com
Subject: Re: glibc
On Mon, Oct 29, 2012 at 10:17:48PM +0400, Vasily Kulikov wrote:
[...]
> 'strncmp' symbol is present on x86_64, but absent on i686:
>
> $ readelf -s logs/glibc-build-i386/elf/rtld-libc.a | grep strncmp
> 22: 00000000 0 NOTYPE GLOBAL DEFAULT UND strncmp
> File: logs/glibc-build-i386/elf/rtld-libc.a(rtld-strncmp-c.os)
> 1: 00000000 0 FILE LOCAL DEFAULT ABS strncmp-c.c
> 15: 00000000 279 FUNC GLOBAL DEFAULT 1 __strncmp_ia32
> 16: 00000000 279 FUNC GLOBAL DEFAULT 1 __GI_strncmp
>
> $ readelf -s logs/glibc-build-x86_64/elf/rtld-libc.a | grep strncmp
> 19: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND strncmp
> File: logs/glibc-build-x86_64/elf/rtld-libc.a(rtld-strncmp.os)
> 10: 0000000000000000 33 FUNC GLOBAL DEFAULT 1 strncmp
> File: logs/glibc-build-x86_64/elf/rtld-libc.a(rtld-strncmp-ssse3.os)
> 11: 0000000000000000 33 FUNC GLOBAL DEFAULT 4 __strncmp_ssse3
The difference between x86_64 and i686 is due to STT_GNU_IFUNC.
> The direct using of 'getenv' adds the dependency. Commenting 2 usages
> of 'getenv' in the patch removed the linking problem.
Which ones?
--
ldv
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