[Bug c++/53816] New: internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[Bug c++/53816] New: internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[ai.azuma at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

             Bug #: 53816
           Summary: internal compiler error: tree check: expected
                    field_decl, have identifier_node in
                    fixed_type_or_null, at cp/class.c:6419, with
                    -std=c++11 option
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ai.azuma@gmail.com


Created attachment 27721
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27721
preprocessed source file

The attached code looks innocent but causes ICE with GCC 4.8.0 20120624
(experimental) and `-std=c++11' option, although it doesn't rely on any C++11
feature. And without `-std=c++11' option, it successfully compiles.

Note that the attached code successfully compiles with GCC 4.6.4 20120622
(prerelease) and 4.7.2 20120623 (prerelease), regardless of whether
`-std=c++0x' option is used.

[Bug c++/53816] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[ai.azuma at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

--- Comment #1 from Ai Azuma <ai.azuma at gmail dot com> 2012-06-30 06:34:40 UTC ---
Created attachment 27722
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27722
Output of -v option

[Bug c++/53816] [4.7/4.8 Regression] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-checking
      Known to work|4.7.2                       |
   Target Milestone|---                         |4.7.2
            Summary|internal compiler error:    |[4.7/4.8 Regression]
                   |tree check: expected        |internal compiler error:
                   |field_decl, have            |tree check: expected
                   |identifier_node in          |field_decl, have
                   |fixed_type_or_null, at      |identifier_node in
                   |cp/class.c:6419, with       |fixed_type_or_null, at
                   |-std=c++11 option           |cp/class.c:6419, with
                   |                            |-std=c++11 option
      Known to fail|                            |4.7.2

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-02 08:56:09 UTC ---
Also fails on the 4.7 branch - but needs enabled checking.  Works on the 4.6
branch.

[Bug c++/53816] [4.7/4.8 Regression] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-07-02
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jason at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-07-02 09:47:02 UTC ---
Slightly reduced:
template <typename T>
struct S { int v () const; };
template <typename T>
struct V : public S<T> {};
struct U
{
  V<int> v;
  template<typename T>
  struct W
  {
    W (U const &x) { V<int> const &v = x.v; v.v(); }
  };
};

Started failing with http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172165
aka PR48500 (so it surprises me it doesn't hit 4.6.x too because that change
has been backported there too).

[Bug c++/53816] [4.7/4.8 Regression] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

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

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

[Bug c++/53816] [4.7/4.8 Regression] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2012-07-03 03:30:05 UTC ---
Author: jason
Date: Tue Jul  3 03:29:58 2012
New Revision: 189187

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189187
Log:
    PR c++/53816
    * class.c (resolves_to_fixed_type_p): Check uses_template_parms
    (current_function_decl) instead of processing_template_decl.

Added:
    trunk/gcc/testsuite/g++.dg/template/ref6.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/class.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/53816] [4.7/4.8 Regression] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2012-07-03 03:30:05 UTC ---
Author: jason
Date: Tue Jul  3 03:29:58 2012
New Revision: 189187

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189187
Log:
    PR c++/53816
    * class.c (resolves_to_fixed_type_p): Check uses_template_parms
    (current_function_decl) instead of processing_template_decl.

Added:
    trunk/gcc/testsuite/g++.dg/template/ref6.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/class.c
    trunk/gcc/testsuite/ChangeLog

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2012-07-03 03:30:31 UTC ---
Author: jason
Date: Tue Jul  3 03:30:27 2012
New Revision: 189189

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189189
Log:
    PR c++/53816
    * class.c (resolves_to_fixed_type_p): Check uses_template_parms
    (current_function_decl) instead of processing_template_decl.

Added:
    branches/gcc-4_7-branch/gcc/testsuite/g++.dg/template/ref6.C
Modified:
    branches/gcc-4_7-branch/gcc/cp/ChangeLog
    branches/gcc-4_7-branch/gcc/cp/class.c
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog

[Bug c++/53816] [4.7/4.8 Regression] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2012-07-03 03:30:31 UTC ---
Author: jason
Date: Tue Jul  3 03:30:27 2012
New Revision: 189189

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189189
Log:
    PR c++/53816
    * class.c (resolves_to_fixed_type_p): Check uses_template_parms
    (current_function_decl) instead of processing_template_decl.

Added:
    branches/gcc-4_7-branch/gcc/testsuite/g++.dg/template/ref6.C
Modified:
    branches/gcc-4_7-branch/gcc/cp/ChangeLog
    branches/gcc-4_7-branch/gcc/cp/class.c
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog

[Bug c++/53816] [4.7/4.8 Regression] internal compiler error: tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6419, with -std=c++11 option

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53816

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> 2012-07-03 03:31:29 UTC ---
Fixed for 4.7.2.