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Re: libstdc++.so: undefined reference to

From: Ian Lance Taylor <iant at google dot com>
To: lulu he <loloseed at gmail dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Wed, 09 Jun 2010 00:06:35 -0700
Subject: Re: libstdc++.so: undefined reference to
References: <AANLkTilF1zDJfLyUkI-QtMVh3004CnTK8R0Ai9cA612o@mail.gmail.com>

lulu he <loloseed@gmail.com> writes:

> I got gcc42,gcc43,and gcc34,seperately in /usr/local/gcc42 ,
> /usr/local/gcc43 , /usr/local/gcc34 directory on my server.
>
> I use gcc43 to compile PARSEC benchmark,but i got the following error:
> /usr/local/libstdc++.so: undefined reference to '_Unwind_GetIPInfo@GCC_4.2.0'
> /usr/local/libstdc++.so: undefined reference to ...
> ...
>
> I have link /usr/local/lib64/libstdc++.so TO
> /usr/local/gcc43/libstdc++.so.6.0.10 ,
> and I don't know what's going wrong?

The error message refers to /usr/local/libstdc++.so, not
/usr/local/lib64/libstdc++.so.  It sounds like you are compiling with
gcc 4.3 and linking dynamically against a libstdc++.so built with gcc
4.2.  In some cases that will work, in others it won't.

Ian

References:
- libstdc++.so: undefined reference to
  - From: lulu he

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