https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101135
--- Comment #4 from anlauf at gcc dot gnu.org --- Created attachment 52311 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52311&action=edit Patch that regtests ok. The patch suggested by the reporter is rather close to this one. We need to special-case optional arguments of procedures with bind(c) attribute. I haven't understood the details yet, but excluding those prevents regressions in the c-binding testsuite, e.g. bind-c-contiguous-4.*. We need to fix the pattern for testcase gfortran.dg/missing_optional_dummy_6a.f90 which would have failed with -fsanitize=undefined without this patch.
