On Thu, Feb 05, 2026 at 02:35:27PM +0900, Jason Merrill wrote:
> On 2/5/26 1:53 AM, Marek Polacek wrote:
> > On Wed, Feb 04, 2026 at 08:06:18PM +0900, Jason Merrill wrote:
> > > On 2/4/26 6:11 AM, Marek Polacek wrote:
> > > > Bootstrapped/regtested on ppc64le-pc-linux-gnu, ok for 17.0?
> > > >
> > > > -- >8 --
> > > > This implements [class.bit]/2: An unnamed bit-field shall not be
> > > > declared with a cv-qualified type. This was clarified in DR 2229.
> > > >
> > > > DR 2229
> > > > PR c++/123935
> > > >
> > > > gcc/cp/ChangeLog:
> > > >
> > > > * decl2.cc (grokbitfield): Disallow cv-qualified unnamed
> > > > bit-fields.
> > > >
> > > > gcc/testsuite/ChangeLog:
> > > >
> > > > * g++.dg/DRs/dr2229.C: New test.
> > > > ---
> > > > gcc/cp/decl2.cc | 9 +++++++++
> > > > gcc/testsuite/g++.dg/DRs/dr2229.C | 12 ++++++++++++
> > > > 2 files changed, 21 insertions(+)
> > > > create mode 100644 gcc/testsuite/g++.dg/DRs/dr2229.C
> > > >
> > > > diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
> > > > index 20ee662eea2..eb2294fffd0 100644
> > > > --- a/gcc/cp/decl2.cc
> > > > +++ b/gcc/cp/decl2.cc
> > > > @@ -1635,6 +1635,15 @@ grokbitfield (const cp_declarator *declarator,
> > > > return NULL_TREE;
> > > > }
> > > > + /* [class.bit]/2 "An unnamed bit-field shall not be declared with
> > > > + a cv-qualified type." */
> > > > + if (!DECL_NAME (value) && TYPE_QUALS (type) != TYPE_UNQUALIFIED)
> > > > + {
> > > > + error_at (DECL_SOURCE_LOCATION (value),
> > >
> > > This seems like a pedwarn rather than an error.
> > >
> > > > + "unnamed bit-field cannot be cv-qualified");
> > > > + return NULL_TREE;
> > >
> > > ...and then continue.
> >
> > clang++ gives an error, but any diagnostic will do. Thus:
> >
> > dg.exp passed on x86_64-pc-linux-gnu.
>
> OK, thanks.
Presumably OK for 17.0. Or even trunk?
Marek
