https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255
--- Comment #4 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- (In reply to Marek Polacek from comment #1) > Without the standalone test case we can't do much, unfortunately. Would you > have at least the preprocessed source? It was actually a standalone test case, but one needs separate compilation to run it: $ gcc-snapshot -Wall -Wextra -O2 -c tst1.c $ gcc-snapshot -Wall -Wextra -O2 -c tst2.c $ gcc-snapshot tst1.o tst2.o -o tst $ ./tst i = 1 ai = FFFFFFFFFFFFFFFF