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Re: tests for GCC internal functions

On Wed, 2017-08-16 at 16:51 +0200, Marek Polacek wrote:
> On Wed, Aug 16, 2017 at 08:46:20AM -0600, Martin Sebor wrote:
> > Is there a setup for writing and running as part of the test
> > suite unit tests that exercise internal GCC functions like
> > error and warning?  I ask because of a couple of bugs that
> > were recently reported for the %s directive in GCC's
> > diagnostics (81859 and 81586) that were only caught by running
> > valgrind on GCC, but that could have been caught by GCC's own
> > tests for these APIs if they existed.
> > 
> > I can't find any except some in the gcc.dg/plugin directory
> > (though they weren't written to exercise the functions but
> > rather the plugin interface).  Would adding a plugin for
> > this sort of thing be the right way to do it?
> Isn't -fself-test the thing you're looking for?

Indeed; looking at those bugs, it looks like you want to be adding
to/extending the selftests near end of pretty-print.c (that way you can
easily re-run them under valgrind via "make selftest-valgrind");
probably in selftest::test_pp_format, which already has a little
coverage for %s.

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