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From: "luigighiron at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114857] New: Pointer attributes and qualifiers are parsed
 in wrong order
Date: Thu, 25 Apr 2024 22:37:18 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114857

            Bug ID: 114857
           Summary: Pointer attributes and qualifiers are parsed in wrong
                    order
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: luigighiron at gmail dot com
  Target Milestone: ---

GCC accepts the following declaration:

int*const[[]]p=3D0;

And rejects the following declaration:

int*[[]]const p=3D0;

It seems that GCC expects the attributes of a pointer declarator to come af=
ter
the qualifiers. The standard specifies in the grammar that the attributes
should come before qualifiers and not after:

> ptr-operator:
> * attribute-specifier-seq opt cv-qualifier-seq opt
> & attribute-specifier-seq opt
> && attribute-specifier-seq opt
> nested-name-specifier * attribute-specifier-seq opt cv-qualifier-seq opt
Section 9.3.1 "General" [dcl.decl.general] Paragraph 5 ISO/IEC 14882:2020

The first declaration should be rejected and the second declaration should =
be
accepted. Clang and MSVC get this correct (though not EDG I think so Visual
Studio will show errors in the correct declarations and not in the incorrect
declarations), and GCC gets this correct with pointer to members but not wi=
th
normal pointers.=