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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: Thu, 10 Jun 2010 06:56:23 -0700
Subject: Re: libstdc++.so: undefined reference to
References: <AANLkTilF1zDJfLyUkI-QtMVh3004CnTK8R0Ai9cA612o@mail.gmail.com> <mcrbpbkwupw.fsf@dhcp-172-17-9-151.mtv.corp.google.com> <AANLkTinTUcYlKHsew3AHxJSIcRwymTTRP8HJLnEK0z-R@mail.gmail.com> <mcr39www79j.fsf@dhcp-172-17-9-151.mtv.corp.google.com> <AANLkTikI6jv3JMNG3HI54YAqqn08M8ORnr1K520oShLJ@mail.gmail.com> <AANLkTil1ljtWTeOqgl6X-6BfNSOLwZpmQAtcSikrJK1K@mail.gmail.com> <AANLkTilMlYxkkeLZ8_sUhwJuWAtEUOAX0VLqWXF-7Bh4@mail.gmail.com> <AANLkTinvRVVagHCQJNSsQU-6tPZOM3mXU1CP2gIPzNRD@mail.gmail.com>

lulu he <loloseed@gmail.com> writes:

> I finally fix it by rename libgcc_s.so.1 .
> mv /usr/local/lib64/libgcc_s.so.1 /usr/local/lib64/libgcc_s.so.1.old
>
> Everything is fine!
>
> But why???

A key point here is that the error is not coming from gcc.  It is
coming from the dynamic linker.  The search patch used by the dynamic
linker to find libraries at runtime is different from the search path
used by gcc (really the linker as directed by gcc) to find libraries
at link time.

Ian

References:
- libstdc++.so: undefined reference to
  - From: lulu he
- Re: libstdc++.so: undefined reference to
  - From: Ian Lance Taylor
- Re: libstdc++.so: undefined reference to
  - From: lulu he
- Re: libstdc++.so: undefined reference to
  - From: lulu he
- Re: libstdc++.so: undefined reference to
  - From: lulu he
- Re: libstdc++.so: undefined reference to
  - From: lulu he

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