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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/114606] New: -Whardened doesn't trigger with
 -fcf-protection=none
Date: Fri, 05 Apr 2024 16:09:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114606

            Bug ID: 114606
           Summary: -Whardened doesn't trigger with -fcf-protection=3Dnone
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

-Whardened warns when -fhardened couldn't enable a hardening option because
that option was disabled on the command line, e.g.:

$ ./cc1plus -quiet g.C  -fhardened -O2 -fstack-protector
cc1plus: warning: =E2=80=98-fstack-protector-strong=E2=80=99 is not enabled=
 by =E2=80=98-fhardened=E2=80=99
because it was specified on the command line [-Whardened]

but it doesn't work as expected with -fcf-protection=3Dnone:

$ ./cc1plus -quiet g.C  -fhardened -O2 -fcf-protection=3Dnone
# should warn

because we're checking =3D=3D CF_NONE which doesn't distinguish between not=
hing and
-fcf-protection=3Dnone.  I'm hoping the fix is simply to use OPTION_SET_P.=