[Bug c++/50437] New: [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[Bug c++/50437] New: [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[zeratul976 at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50437

             Bug #: 50437
           Summary: [C++0x] [4.7 regression] ICE for trivial use of lambda
                    in template function
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zeratul976@hotmail.com


The following trivial use of a lambda in a template function:

template <typename T>
void f()
{
    auto g = [](T t){ return t == 0; };
    g(T());
}

int main()
{
    f<int>();
}

Gives the following ICE with GCC 4.7.0-20110910:

test.cpp: In instantiation of 'void f() [with T = int]':
test.cpp:10:12:   required from here
test.cpp:5:5: internal compiler error: in cxx_incomplete_type_diagnostic, at
cp/typeck2.c:459

GCC 4.6.1 compiles the code successfully.

[Bug c++/50437] [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50437

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-09-22
                 CC|                            |jason at gcc dot gnu.org
     Ever Confirmed|0                           |1

[Bug c++/50437] [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50437

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.7.0

[Bug c++/50437] [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50437

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

[Bug c++/50437] [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50437

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++/50437] [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50437

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-10-13 21:23:42 UTC ---
Author: jason
Date: Thu Oct 13 21:23:36 2011
New Revision: 179944

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179944
Log:
    PR c++/50437
    * cp-tree.h (struct tree_lambda_expr): Add closure field.
    (LAMBDA_EXPR_CLOSURE): New.
    * pt.c (tsubst_copy_and_build) [LAMBDA_EXPR]: Likewise.
    * semantics.c (build_lambda_object): Use it instead of TREE_TYPE.
    (begin_lambda_type, lambda_function, add_capture): Likewise.
    (add_default_capture, lambda_expr_this_capture): Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-auto1.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/pt.c
    trunk/gcc/cp/semantics.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/50437] [C++0x] [4.7 regression] ICE for trivial use of lambda in template function

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50437

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

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

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-10-13 21:32:09 UTC ---
Fixed.