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Re: [Libunwind-devel] Build glibc linking libunwind

From: Paul Pluzhnikov
Subject: Re: [Libunwind-devel] Build glibc linking libunwind
Date: Wed, 12 Oct 2011 07:40:29 -0700

On Wed, Oct 12, 2011 at 4:14 AM, Ken Werner <address@hidden> wrote:
> On 09/24/2011 11:46 PM, Fabio wrote:
>> Hi all,
>> I am trying to build glibc and link libunwind to get a backtrace at
>> the beginning of some glibc function like strcpy for example but I
>> can't get them to build.
>> I include -lunwind in the CFLAGS and I export
>> LD_LIBRARY_PATH=/usr/local/lib, but when it comes to build it
>> fails:
>> /home/wintermute/tesi/glibc/2.14/custom/glibc-2.14/string/strcpy.c:43:
>> undefined reference to `_Ux86_getcontext'
>> /home/wintermute/tesi/glibc/2.14/custom/glibc-2.14/string/strcpy.c:44:
>> undefined reference to `_ULx86_init_local'
>> collect2: ld returned 1 exit status
>> Am I missing something? Sorry for asking a dumb question and thanks in
>> advance.
> I suspect you're on a system where the linker does not pull in indirect
> shared libs (the default behavior of recent Debian or Fedora based distros).
> I had a similar issue - see:
> You're probably just missing to link against Adding
> -lunwind-x86 to your CLFAGS/LDFLAGS should be sufficient.

The link failure is while linking itself. It better not use (or any other shared library) for obvious reasons.

Paul Pluzhnikov

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