[patch,libgfortran,toplevel] Use libbacktrace in libgfortran

[Ian Lance Taylor]

On Fri, Aug 14, 2015 at 1:32 AM, FX <fxcoudert@gmail.com> wrote:
> Use libbacktrace (instead of our own unwind-based code) to display backtraces from libgfortran upon error or user request.
>
>   1. In toplevel Makefile.def, make libgfortran depend on libbacktrace (needs global reviewer approval)

This change (and the corresponding change to Makefile.in) is OK.

Thanks.

Ian