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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/101833] New: [9/10/11/12 Regression] ICE with -Wformat on a
 constructor with a virtual base
Date: Mon, 09 Aug 2021 18:25:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101833

            Bug ID: 101833
           Summary: [9/10/11/12 Regression] ICE with -Wformat on a
                    constructor with a virtual base
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
class Base {};
struct VDerived : virtual Base
{
                VDerived(int x, const char * f, ...)
__attribute__((format(printf, 5, 6)));
}  a(1, "%s %d", "foo", 1);
----- CUT ----
We get an ICE:
<source>:5:26: warning: 'format' attribute argument 2 value '5' exceeds the
number of function parameters 3 [-Wattributes]
    5 | }  a(1, "%s %d", "foo", 1);
      |                          ^
<source>:5:26: internal compiler error: in get_constant, at
c-family/c-format.c:325
0x1dbb089 internal_error(char const*, ...)

This started in 9.1.0=