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Re: [Bug ld/16452] New: ELF executable with weak reference linked with l

Subject: Re: [Bug ld/16452] New: ELF executable with weak reference linked with ld causes assertion in ld.so
Date: Thu, 16 Jan 2014 13:24:02 +0400

Good day, I would like to clarify :
I'm trying to compile openssh , using own compiled toolchan. at compile time I 
come across such an error
openbsd-compat / / libopenbsd-compat.a (bsd-misc.o): (. pdr +0 x20): undefined 
reference to `setlogin @ @ GLIBC_2.0 '
/ home / andrew / Desktop / mips-toolchan / bin /.. /.. / mips-toolchan / / 
root/lib/libc.so.6: undefined reference to `setlogin @ @ GLIBC_2.0
I checked
Content libraries connected during linking:
libc_pic.a: setlogin.os: U __ divdi3_internal
libc_pic.a: setlogin.os: 00000000 n __ evoke_link_warning_setlogin
libc_pic.a: setlogin.os: U __ GI_memmove
libc_pic.a: setlogin.os: U __ GI_memset
libc_pic.a: setlogin.os: U _gp_disp
libc_pic.a: setlogin.os: U __ libc_errno
libc_pic.a: setlogin.os: U __ moddi3_internal
libc_pic.a: setlogin.os: 00000000 T setlogin
libc_pic.a: setlogin.os: U __ udivdi3_internal
libc_pic.a: setlogin.os: U __ umoddi3_internal
This may be due to an error upomyanotoy (regression in ld)?15 янв. 2014 г.

> http://sourceware.org/bugzilla/show_bug.cgi?id=16452
>            Bug ID: 16452
>           Summary: ELF executable with weak reference linked with ld
>                    causes assertion in ld.so
>           Product: binutils
>           Version: 2.25 (HEAD)
>            Status: NEW
>          Severity: normal
>          Priority: P2
>         Component: ld
>          Assignee: unassigned at sourceware dot org
>          Reporter: brnguyen at nvidia dot com
> Created attachment 7357
>  --> http://sourceware.org/bugzilla/attachment.cgi?id=7357&action=edit
> Reproduction test case
> The attached reproduction test case builds two DSOs, one linked against
> pthreads, and one not linked against pthreads, which implement the same
> interface.  It also builds a test application which is linked against the DSO
> that uses pthreads.  To reproduce the bug, the DSO that does not use pthreads
> is copied over the DSO that uses pthreads, and the test application is run.
> Using an ld built from commit 08d0cad39e31083cb8a885703604f7b20d359849, this
> triggers the following assertion on ld.so built from commit
> 2f10c4d6901e7a4c4ad294cc5bb8ece6547f4f62 as well as ld.so from glibc
> 2.15-0ubuntu10.5-ppa1 on my Ubuntu 12.04 LTS system:
> Inconsistency detected by ld.so: dl-version.c: 224: _dl_check_map_versions:
> Assertion `needed != ((void *)0)' failed!
> This may be related to bugs #15149 and #12549. Also relevant is Debian bug
> #728529.
> This appears to be a regression in ld (though there may be a bug in ld.so as
> well). I bisected binutils using this reproduction test case to try to narrow
> down the commit(s) responsible for this regression. Interestingly, ld fails to
> link the test executable in a commit range between ToT master and
> binutils_2.22, with the following error messages:
> /home/brnguyen/build/binutils//ld/ld: /tmp/cc3K1rHK.o: undefined reference to
> symbol 'pthread_create@@GLIBC_2.2.5'
> /home/brnguyen/build/binutils//ld/ld: note: 'pthread_create@@GLIBC_2.2.5' is
> defined in DSO //lib/x86_64-linux-gnu/libpthread.so.0 so try adding it to the
> linker command line
> It appears this link error was introduced by commit
> b64fb44af4f416fbbbda3de03fcfff61d80c841c ("Also track weak references") and
> later removed by commit 879707c642925947e156b7ae2169b89f844532cd ("Exclude 
> weak
> refs when considering whether an --as-needed library is needed"), at which
> point ld produces an executable which triggers the assertion.
> -- 
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