https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84141
--- Comment #32 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- (In reply to Jürgen Reuter from comment #31) > Unfortunately, the problem with our external libraries still persist. Don't > know how to provide you with a test case for this without providing our > complete code and their external complete code. :( How does the error manifest itself? Internal library error, segfault, ... ? If it is an internal error, you could compile everything with -g (including the external libraries), start under a debugger, then set a breakpoint at _gfortrani_internal_error, and then run. A backtrace could be quite illuminating. Similar for a segfault - run under a debugger and look at a backtrace.