[Bug c++/54383] New: Internal compiler error for lamba function using this-> with -std=c++0x

[Bug c++/54383] New: Internal compiler error for lamba function using this-> with -std=c++0x

[gerald at pfeifer dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

             Bug #: 54383
           Summary: Internal compiler error for lamba function using
                    this-> with -std=c++0x
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gerald@pfeifer.com


The following snippet fails with an internal compiler error on
current SVN:

  auto foo = [&](int a) { return a > this->b; };

~/gcc-x86_64/bin/g++ -std=c++0x x.cc
x.cc: In lambda function:
x.cc:1:36: internal compiler error: Segmentation fault
 auto foo = [&](int a) { return a > this->b; };
                                    ^

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[166291 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

166291 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |166291 at gmail dot com

--- Comment #1 from 166291 at gmail dot com 2012-09-24 12:53:57 UTC ---
The following code breaks GCC 4.7.1:

   auto test = [=]() { this

Yes, I didn't paste that badly. That entire line of code alone by itself in the
file will crash GCC.

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[166291 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

--- Comment #2 from 166291 at gmail dot com 2012-09-26 18:45:36 UTC ---
Some more information is that this only seems to happen when the lambda
captures variables, and it's in the global scope.

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-12-06
     Ever Confirmed|0                           |1

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

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

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

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ogoffart at kde dot org

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-27 10:24:21 UTC ---
*** Bug 56464 has been marked as a duplicate of this bug. ***

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

Paolo Carlini <paolo.carlini at oracle dot com> changed:

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

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-27 10:26:29 UTC ---
Jason, I see you are already working on this one: please double check that
PR56464 is an exact duplicate. Thanks!

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[ogoffart at kde dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

--- Comment #5 from Olivier Goffart <ogoffart at kde dot org> 2013-03-02 15:12:54 UTC ---
The code in Bug 56464 is valid code:
struct bug { bug*a = [&](){return this;}(); };
(Just in case this may change the priority)

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> 2013-03-04 17:12:48 UTC ---
Author: jason
Date: Mon Mar  4 17:12:32 2013
New Revision: 196437

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196437
Log:
    PR c++/56464
    PR c++/54383
    * semantics.c (lambda_expr_this_capture): Handle NSDMI
    and non-class scopes.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-nsdmi1.C
    trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-this10.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/semantics.c

[Bug c++/54383] Internal compiler error for lamba function using this-> with -std=c++0x

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54383

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.8.0

--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> 2013-03-04 17:14:33 UTC ---
Fixed for 4.8.