FWIW from a quick testing both GCC and Clang generate a segfault with full optimizations as long as this isn't the only code in the program (e.g. in my test i p

FWIW from a quick testing both GCC and Clang generate a segfault with full optimizations as long as this isn't the only code in the program (e.g. in my test i put this in a separate function that printf'd some message before doing the assignment). Also GCC does generate the segfault even if this is the only code (in main) but Clang writes code that exits the program with some error code instead of segfaulting in all optimization levels except 0 (with -O0 it generates the segfault like GCC).