From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 10E2D385800F; Mon, 31 Jan 2022 14:50:29 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 10E2D385800F
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/104147] [9/10/11/12 Regression] C preprocessor may
 remove the standard required whitespace between the preprocessing
 tokens
Date: Mon, 31 Jan 2022 14:50:28 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: preprocessor
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 9.5
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-104147-4-rG56M0qyBb@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-104147-4@http.gcc.gnu.org/bugzilla/>
References: <bug-104147-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 31 Jan 2022 14:50:29 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104147

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Looking at the PREV_WHITE uses, they look like:
  if (token->type =3D=3D CPP_PADDING)
    {
      avoid_paste =3D true;
      if (print.source =3D=3D NULL
          || (!(print.source->flags & PREV_WHITE)
              && token->val.source =3D=3D NULL))
        print.source =3D token->val.source;
      return;
    }
...
  if (avoid_paste)
    {
...
      else if (print.source->flags & PREV_WHITE
...
    }
  else if (token->flags & PREV_WHITE)

and stringify_arg has something similar.
So, makes me wonder if funlike_invocation_p isn't just a copy & paste
of those conditions, with the important difference that padding (what we
remember) is not the source, but the token itself.
I'd expect something like:
      if (padding =3D=3D NULL
          || padding->val.source =3D=3D NULL
          || (!(padding->val.source->flags & PREV_WHITE)
              && token->val.source =3D=3D NULL))
        padding =3D token;
instead.=