https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107498
--- Comment #7 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> --- Created attachment 53818 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53818&action=edit Pre-processed source of unmodified mdb.c (gzip-compressed) Here's the preprocessed source for mdb.c without marking the variables as volatile.