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Date: Thu, 20 Jan 2011 00:47:00 -0000
Message-ID: <AANLkTi=CwVi2NRb1UOUXruOUwsXbyKdvbk5o+yj-95VW@mail.gmail.com>
Subject: Re: g++ cross distro compilation problem
From: Jonathan Wakely <jwakely.gcc@gmail.com>
To: Nick Stokes <randomaccessiterator@gmail.com>
Cc: gcc-help@gcc.gnu.org
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On 19 January 2011 23:27, Nick Stokes wrote:
>
> Ian, =A0you are right on. The versions are different:
> compute node (where gcc is built): =A0/lib64/libc-2.5.so
> login node (where gcc is used): =A0/lib64/libc-2.11.2.so
>
> Jonathan, I looked at the config.logs (attached). Both seem to use gnu.

Yes, both your distros have a new enough glibc, so the problem might be sim=
pler:
does it make any difference if you define _GNU_SOURCE when compiling?

That should ensure uselocale is defined by <locale.h>

> When I configure with --enable-clocale=3Dgeneric it indeed remedies the
> issue and g++ works without errors. Are the any serious implications
> of not using gnu model? (any performance issues, or anything like that
> sort?)

The GNU model, which requires glibc 2.3 or later, supports a
per-thread locale (via the uselocale function) so that the locale can
be changed temporarily by the C++ runtime library without affecting
the global process-wide locale.  I believe this avoids possible race
conditions in multithreaded programs which make use of locales.