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Date: Wed, 30 Jun 2021 15:30:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101272

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[12 Regression] error:      |[12 Regression] error:
                   |=E2=80=98nonnull=E2=80=99 argument          |=E2=80=98n=
onnull=E2=80=99 argument
                   |=E2=80=98message=E2=80=99 compared to NULL  |=E2=80=98m=
essage=E2=80=99 compared to NULL
                   |[-Werror=3Dnonnull-compare]   |[-Werror=3Dnonnull-compa=
re]
                   |since                       |since r12-1805
           Keywords|                            |diagnostic

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The warning is valid and expected.  It started to be issued with r12-1805.=
=20
Prior to that, the parentheses around the inequality expression suppressed =
it,
like so:

$ cat t.C && cc1plus.r12-1804 -quiet -Wall -Werror -o/dev/null t.C
__attribute__ ((nonnull)) void
f (int *p) { p =3D=3D 0 ? __builtin_abort () : (void)0; }

__attribute__ ((nonnull)) void
g (int *p) { (p =3D=3D 0) ? __builtin_abort () : (void)0; }

t.C: In function =E2=80=98void f(int*)=E2=80=99:
t.C:2:21: error: =E2=80=98nonnull=E2=80=99 argument =E2=80=98p=E2=80=99 com=
pared to NULL
[-Werror=3Dnonnull-compare]
    2 | f (int *p) { p =3D=3D 0 ? __builtin_abort () : (void)0; }
      |              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus.r12-1804: all warnings being treated as errors=