[Bug c++/31749] New: [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[Bug c++/31749] New: [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[reichelt at gcc dot gnu dot org]

The following invalid code snippet triggers a segfault since GCC 3.1:

========================
namespace std
{
  union abort;
}

void abort();

using std::abort;
========================

bug.cc:8: internal compiler error: Segmentation fault
Please submit a full bug report, [etc.]

Compiling the code with "-fno-builtin" yields:
bug.cc:8: error: 'abort' is already declared in this scope


A slightly different testcase triggers the following ICE:

========================
namespace std
{
  union abort;
}

union abort;

using std::abort;
========================

bug.cc:8: internal compiler error: tree check: expected class 'type', have
'declaration' (type_decl) in comptypes, at cp/typeck.c:1115
Please submit a full bug report, [etc.]


-- 
           Summary: [4.1/4.2/4.3 regression] ICE with invalid redeclaration
                    of builtin
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, monitored
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[reichelt at gcc dot gnu dot org]

-- 

reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.1.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[aaw at google dot com]

------- Comment #1 from aaw at google dot com  2007-04-30 22:47 -------
The first code snippet compiles fine with the trunk and gcc-4.1.1.  Volker, are
you sure the code snippet is correct?

The second snippet does indeed generate the specified error.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[aaw at google dot com]

------- Comment #2 from aaw at google dot com  2007-05-01 00:24 -------
Never mind.  The first snippet triggers the specified error as well.  Not quite
sure what I did...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[aaw at gcc dot gnu dot org]

------- Comment #3 from aaw at gcc dot gnu dot org  2007-05-22 22:41 -------
Assigning to myself since I now have write access to Bugzilla.


-- 

aaw at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |aaw at gcc dot gnu dot org
                   |dot org                     |
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2007-05-22 22:41:08
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2007-08-06 15:12 -------
I no longer get a segfault for the trunk for the first testcase.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[aaw at gcc dot gnu dot org]

------- Comment #5 from aaw at gcc dot gnu dot org  2007-08-06 21:24 -------
No segfault, but it does give an "is already declared in this scope" error. 
Contrary to the claim in the initial bug submission, this is valid code.

>From paragraph 10, section 7.3.3 of the C++ standard:

Since a using-declaration is a declaration, the restrictions on declarations of
the same name in the same declarative region (3.3) also apply to
using-declarations.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[aaw at gcc dot gnu dot org]

------- Comment #6 from aaw at gcc dot gnu dot org  2007-08-06 23:17 -------
Created an attachment (id=14030)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14030&action=view)
Fix for PR 31749.

This patches fixes this PR and includes some ambiguous decl cleanup as well. 
Submission pending completion of full testsuite.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[patchapp at dberlin dot org]

------- Comment #7 from patchapp at dberlin dot org  2007-08-07 19:15 -------
Subject: Bug number PR c++/31749

A patch for this bug has been added to the patch tracker.
The mailing list url for the patch is
http://gcc.gnu.org/ml/gcc-patches/2007-08/msg00452.html


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[aaw at gcc dot gnu dot org]

------- Comment #8 from aaw at gcc dot gnu dot org  2007-08-17 21:42 -------
Subject: Bug 31749

Author: aaw
Date: Fri Aug 17 21:42:38 2007
New Revision: 127600

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=127600
Log:
        PR c++/31749

        gcc/cp/
        * name-lookup.c (do_nonmember_using_decl): Shift implicit type
        declarations into appropriate slots for comparison.  Fix type
        comparison.

        gcc/testsuite/
        * g++.dg/lookup/builtin3.C: New test.
        * g++.dg/lookup/builtin4.C: New test.
        * g++.dg/lookup/using19.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/lookup/builtin3.C
    trunk/gcc/testsuite/g++.dg/lookup/builtin4.C
    trunk/gcc/testsuite/g++.dg/lookup/using19.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/name-lookup.c
    trunk/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2/4.3 regression] ICE with invalid redeclaration of builtin

[aaw at gcc dot gnu dot org]

------- Comment #9 from aaw at gcc dot gnu dot org  2007-08-18 06:26 -------
Fixed by change 127600.


-- 

aaw at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.1/4.2 regression] ICE with invalid redeclaration of builtin

[pinskia at gcc dot gnu dot org]

------- Comment #10 from pinskia at gcc dot gnu dot org  2007-08-18 09:07 -------
No, this was only fixed for the trunk, this is still not fixed for the 4.2
branch or 4.1 branch (it is a regression after all).


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |
            Summary|[4.1/4.2/4.3 regression] ICE|[4.1/4.2 regression] ICE
                   |with invalid redeclaration  |with invalid redeclaration
                   |of builtin                  |of builtin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.2 regression] ICE with invalid redeclaration of builtin

[jsm28 at gcc dot gnu dot org]

------- Comment #11 from jsm28 at gcc dot gnu dot org  2008-07-04 22:01 -------
Closing 4.1 branch.


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jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.1/4.2 regression] ICE    |[4.2 regression] ICE with
                   |with invalid redeclaration  |invalid redeclaration of
                   |of builtin                  |builtin
   Target Milestone|4.1.3                       |4.2.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749

[Bug c++/31749] [4.2 regression] ICE with invalid redeclaration of builtin

[jsm28 at gcc dot gnu dot org]

------- Comment #12 from jsm28 at gcc dot gnu dot org  2009-03-30 21:45 -------
Closing 4.2 branch, fixed in 4.3.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
      Known to fail|                            |4.2.5
      Known to work|                            |4.3.0
         Resolution|                            |FIXED
   Target Milestone|4.2.5                       |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31749