Looking at UNSUPPORTED dejagnu tests for a port...

[Alan Lehotsky]

I’m doing some final polishing on a gcc 8.3 upgrade and taking a look at the unsupported tests.   Most of them are completely sensible (my port doesn’t support trampolines, for example).  But gcc.c-torture/execute/pr78622.c is marked as unsupported.  That appears to be due to the line

   { dg-require-effective-target c99_runtime }

I’m using newlib, and if I manually compile the test case with or without an explicit —std=c99, it compiles and links without error.
Do I need to set something in the baseboards file or in a local .exp file to indicate that c99 is okay?