Re: gnulib "lock" module - test core dump

[Assaf Gordon]

On 07/11/2014 02:45 AM, Paul Eggert wrote:
> Thanks, it seems to be a compiler bug on Ubuntu: "#pragma weak" doesn't work, 
> and this breaks gnulib's glthread module.  For what it's worth I filed a bug report here:
>
> https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1340250
>
> Are you expert enough in Ubuntuese to suggest a workaround?

I found a work-around to test like this:

    $ gl_cv_have_weak=no ./gnulib-tool --test localename

"gl_cv_have_weak" is defined in ./m4/threadlib.m4 .

In this file, there's a mention of "weak symbols evaluating to zero on cygwin", 
which sounds somewhat similar to what you've described in the Ubuntu but report.
The bottom part of the m4 file contains a table of supported platform and specifically 
references the "test-lock" test.
Perhaps there's a way to adjust the M4 test to detect Ubuntu's gcc bug as well?