This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
Re: Undefined symbol warning_at when loading gcc-python-plugin
- From: Ian Lance Taylor <iant at google dot com>
- To: David Narvaez <david dot narvaez at computer dot org>
- Cc: gcc-help at gcc dot gnu dot org
- Date: Thu, 13 Sep 2012 22:18:08 -0700
- Subject: Re: Undefined symbol warning_at when loading gcc-python-plugin
- References: <CACFh1D74PFXFFEL0dXo+1XyaLDN6vLDRBoXg_kEFLtCc0p6-uw@mail.gmail.com>
On Thu, Sep 13, 2012 at 6:35 PM, David Narvaez
<david.narvaez@computer.org> wrote:
>
> I'm trying to package gcc-python-plugin[0] for Gentoo on amd64, but
> after compiling the python.so library, I cannot load it into gcc as a
> plugin because of the following error:
>
> cc1: error: cannot load plugin
> /var/tmp/portage/dev-util/gcc-python-plugin-0.10/work/gcc-python-plugin-0.10-3.2/python.so
> /var/tmp/portage/dev-util/gcc-python-plugin-0.10/work/gcc-python-plugin-0.10-3.2/python.so:
> undefined symbol: warning_at
>
>
> # nm -C python.so | grep -C 5 warning_at
> U warning_at
Not a C++ symbol.
> # nm -C /usr/lib/debug/usr/libexec/gcc/x86_64-pc-linux-gnu/4.7.1/cc1.debug
> | grep -C 5 warning_at
> 0000000000c18b50 T warning_at(unsigned int, int, char const*, ...)
A C++ symbol.
Your plugin is expecting a GCC built with C, but you have a GCC built
with C++. GCC 4.8 will require C++. In GCC 4.7 it is the default but
is optional. Quick workaround to build GCC 4.7 with C: configure GCC
4.7 with --diable-build-poststage1-with-cxx. Otherwise you will need
to build your plugin with C++.
Ian