https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115293
Bug ID: 115293
Summary: Warn if a compiler flag downgrades protection provided
by -fhardened
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: siddhesh at gcc dot gnu.org
Target Milestone: ---
When -fhardened is passed alongside options it enables, the options could
override behaviour enabled by -fhardened. This is by design, but there's a hole
in this, in that accidentally passing, e.g. -fstack-protector alongside
-fhardened could downgrade stack protection.
Add a new warning (-Wweakened-hardening) that points out such a situation,
allowing developers to turn off the warning if the downgrade in hardening is
deliberate.
