[Bug c++/56947] New: [4.7.3 regression] Bogus 'XX' was not declared in this scope

[Bug c++/56947] New: [4.7.3 regression] Bogus 'XX' was not declared in this scope

[ppluzhnikov at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

             Bug #: 56947
           Summary: [4.7.3 regression] Bogus 'XX' was not declared in this
                    scope
    Classification: Unclassified
           Product: gcc
           Version: 4.7.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ppluzhnikov@google.com


This is a recent gcc-4_7-branch regression.

The case builds with trunk (r197936), fails with 4.7 branch (r197941):


struct A
{
    A (int);
};

template < typename >
void Fn ()
{
    const int kCapacity = 0;
    struct Q:A
    {
        Q ():A (kCapacity) { }
    };
    Q q;
}
template void Fn < int >();


$ trunk/bin/g++ -c t.cc && echo ok
ok

$ 4.7/bin/g++ -c t.cc
t.cc: In instantiation of ‘Fn()::Q::Q() [with <template-parameter-1-1> = int]’:
t.cc:14:7:   required from ‘void Fn() [with <template-parameter-1-1> = int]’
t.cc:16:26:   required from here
t.cc:12:26: error: ‘kCapacity’ was not declared in this scope
>From gcc-bugs-return-420222-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 13 16:43:14 2013
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From: "wbrana at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/54078] Bytemark 46% bigger binary with -flto
Date: Sat, 13 Apr 2013 16:43:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idT078

--- Comment #5 from wbrana <wbrana at gmail dot com> 2013-04-13 16:43:10 UTC ---
branch 4.9

without lto
101462 bytes

with -flto -fwhole-program
157243 bytes - linker bfd
155488 bytes - linker gold

other CFLAGS = -O3 -g0 -march=corei7 -fomit-frame-pointer -funroll-loops
-ffast-math -fno-PIE -fno-exceptions -fno-stack-protector

[Bug c++/56947] [4.7 Regression] Bogus 'XX' was not declared in this scope

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-04-15
      Known to work|                            |4.7.2, 4.8.0
   Target Milestone|---                         |4.7.4
            Summary|[4.7.3 regression] Bogus    |[4.7 Regression] Bogus 'XX'
                   |'XX' was not declared in    |was not declared in this
                   |this scope                  |scope
     Ever Confirmed|0                           |1
      Known to fail|                            |4.7.3

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-04-15 10:24:57 UTC ---
Ick.  Confirmed.

[Bug c++/56947] [4.7 Regression] Bogus 'XX' was not declared in this scope

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jason at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Supposedly caused by r196087.

[Bug c++/56947] [4.7 Regression] Bogus 'XX' was not declared in this scope

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |52026

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed that.  I suppose rejects-valid is "better" than wrong-code in some
sense but the former only was for C++11 code.  If there isn't a safe fix for
this issue I'd consider reverting the patch for PR52026.

[Bug c++/56947] [4.7 Regression] Bogus 'XX' was not declared in this scope

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org

[Bug c++/56947] [4.7 Regression] Bogus 'XX' was not declared in this scope

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Fri May 30 18:55:56 2014
New Revision: 211094

URL: http://gcc.gnu.org/viewcvs?rev=211094&root=gcc&view=rev
Log:
    PR c++/56947
    * pt.c (instantiate_decl): Check that defer_ok is not set for
    local class members.

Added:
    trunk/gcc/testsuite/g++.dg/template/local8.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/pt.c

[Bug c++/56947] [4.7 Regression] Bogus 'XX' was not declared in this scope

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for 4.7.4.

[Bug c++/56947] [4.7 Regression] Bogus 'XX' was not declared in this scope

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56947

--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Jul 14 20:39:35 2014
New Revision: 212524

URL: https://gcc.gnu.org/viewcvs?rev=212524&root=gcc&view=rev
Log:
    PR c++/61445
    PR c++/56947
    * pt.c (instantiate_decl): Don't check defer_ok for local class
    members.

Added:
    trunk/gcc/testsuite/g++.dg/template/local9.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/pt.c