[Bug c++/49105] New: [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[Bug c++/49105] New: [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49105

           Summary: [C++0x][SFINAE] ICE during list-initialization of
                    rvalue-references to const
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: daniel.kruegler@googlemail.com
                CC: jason@redhat.com


gcc 4.7.0 20110514 (experimental) in C++0x mode produces an internal compiler
error when compiling this code at the line marked with #:

//----
template<class T, class = decltype(T{})>
char f(int);

template<class T>
auto f(...) -> char(&)[2];

static_assert(sizeof(f<const int&&>(0)) == 1, "Error"); // #
//----

"internal compiler error: in cp_build_c_cast, at cp/typeck.c:6442|"

The code should be accepted.

Further tests provided evidence that we need an value-initialization of an
rvalue reference to const T to reproduce the ICE, even though the sole
initialization written as 

const int&& rri{};

does not cause the same kind of problem. This is odd, because the functional
cast T{} has exactly the same semantics as the corresponding
direct-list-initialization.

Additionally, the same error occurs, when the list has one element, e.g. the
expression T{0} results in the same kind of error.

[Bug c++/49105] [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49105

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.05.23 17:38:40
                 CC|                            |jason at gcc dot gnu.org
         AssignedTo|unassigned at gcc dot       |jason at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

[Bug c++/49105] [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49105

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-23 22:56:08 UTC ---
Author: jason
Date: Mon May 23 22:56:04 2011
New Revision: 174093

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=174093
Log:
    PR c++/49105
    * typeck.c (cp_build_c_cast): Don't strip cv-quals when
    converting to reference.
    (build_static_cast_1): Update for glvalues.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/sfinae25.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/typeck.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/49105] [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49105

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-23 22:56:00 UTC ---
Author: jason
Date: Mon May 23 22:55:56 2011
New Revision: 174092

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=174092
Log:
    PR c++/49105
    * typeck.c (build_const_cast_1): Handle rvalue references.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/rv-cast2.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/typeck.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/49105] [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49105

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-25 01:08:42 UTC ---
Author: jason
Date: Wed May 25 01:08:38 2011
New Revision: 174162

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=174162
Log:
    PR c++/49105
    * typeck.c (build_const_cast_1): Handle rvalue references.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/rv-cast2.C
Modified:
    branches/gcc-4_6-branch/gcc/cp/ChangeLog
    branches/gcc-4_6-branch/gcc/cp/typeck.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog

[Bug c++/49105] [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49105

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.6.1

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-25 01:13:46 UTC ---
Fixed for 4.6.1.

[Bug c++/49105] [C++0x][SFINAE] ICE during list-initialization of rvalue-references to const

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49105

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wsf at fultondesigns dot
                   |                            |co.uk

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-29 00:45:29 UTC ---
*** Bug 44920 has been marked as a duplicate of this bug. ***