build system: Add various compiler flags that enable warnings on UB

Some types of Undefined Behavior can be determined statically at compile
time and gcc now has a set of flags that make it emit warnings in that
case instead of doing the __builtin_trap() / optimize / UD2-opcode dance
that silently breaks the resulting binary.

BUG=chromium:958270
BRANCH=none
TEST=abuild passes (probably not)

Change-Id: I3aa5ca00c9838cc7517160069310a1ef85372027
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32814
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

0 files changed, 0 insertions, 0 deletions