I found the .la file in /usr/local/lib and /usr/local/lib/i386.
After removing the incorrect LD, the warning messages are gone.
Thank you again for your info.

Xujun

On Thu, Jul 30, 2015 at 9:27 AM, John Peterson <jwpeter...@gmail.com> wrote:

>
>
> On Wed, Jul 29, 2015 at 6:00 PM, Xujun Zhao <xzha...@gmail.com> wrote:
>
>> I installed my GCC using brew install.
>> Do you know where I can find this .la file?
>>
>
> I don't know.  Homebrew probably installed it in /usr/local, but I don't
> recommend messing around with these files if you don't understand what
> you're doing.
>
>
>> I also used GCC to build PETSc, but it didn't have such warnings where I
>> run a PETSc program. The libmesh was built with mpicc/mpicxx in the
>> PETSC_ARCH directory, and it caused such warnings.
>>
>
> That's probably because PETSc doesn't link against libstdc++.la
>
> --
> John
>
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