[m-rev.] diff: fix segmentation fault in runtime on Mac OS X

[Peter Wang]

On Thu, 26 Jun 2014 14:43:58 +1000 (EST), Julien Fischer <jfischer at opturion.com> wrote:
> Hi Peter,
> 
> On Thu, 26 Jun 2014, Peter Wang wrote:
> 
> > What a mess.
> 
> Indeed.  (Although not quite as bad as trying to get the Unicode version
> of the argument vector on Windows.)
> 
> > Presumably all libraries other the glibc provide the standard
> > strerror_r, so the patch below should be less fragile.
> 
> features.h is not a standard header, so the patch below is simply
> likely to break on systems that don't provide it (i.e. my laptop).

Ok, we shouldn't include features.h explicitly but __GNU_LIBRARY__
should be defined after including string.h where strerror_r lives.

We could also forgo strerror_r completely and just use strerror_l or
sys_errlist.

Peter