https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91995
--- Comment #1 from Mikael Pettersson <mikpelinux at gmail dot com> --- Created attachment 46997 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46997&action=edit Workaround patch Patch which avoids the miscompilation by changing the source code to replace these formal-with-defaults with plain formals without defaults. This is merely a workaround, I'm not suggesting this as the proper fix for upstream.