What would cause gcc (8.1.0) to lose line numbers when printing out a warning? $ gcc -O3 -g -c file.c -o file.o (followed by tons of -I's) ./file.h: In function 'fcn': cc1: warning: '__builtin_memset' writing 72 bytes into a region of size 52 overflows the destination [-Wstringop-overflow=] Note that the function is pretty large, and there's no direct calls to memset, so I'm guessing some optimization is converting a loop to a memset or something. I don't have a reduced case yet... I've got 30k lines I'm trying to auto-shrink down.
