[PATCH 4/4][libbacktrace] Add tests for unused formats

[Tom de Vries]

On 02-01-19 14:20, Rainer Orth wrote:
> Unfortunately, libbacktrace is one of those libraries that don't produce
> Dejagnu-style .sum and .log files, so test failures are buried in the
> make check output and very easily overlooked.

FTR, I've filed PR88002 - "libbacktrace and libiberty tests don't use
dejagnu" for that ( https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88002 ).

Thanks,
- Tom