https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64862
--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- Note also that gcc.dg/format tests are run both with and without -DWIDE - the intent there is that wide string formats should be tested, when supported, with essentially the same tests as narrow string formats (via appropriate macros to make the tests generic, e.g. wrapping format strings in a macro L()). That could be applied to other string types as well by running the tests more than twice.
