[Bug c++/63885] New: ICE in static assert of constexpr forwarding xvalue container member rvalue reference

[Bug c++/63885] New: ICE in static assert of constexpr forwarding xvalue container member rvalue reference

[listcrawler at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63885

            Bug ID: 63885
           Summary: ICE in static assert of constexpr forwarding xvalue
                    container member rvalue reference
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: listcrawler at gmail dot com

Created attachment 33983
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33983&action=edit
preprocessed source file

Internal compiler error in static assert of constexpr forwarding xvalue
container member rvalue reference. 

g++ 4.8 and 4.9 passes, but trunk built from r217559 on ubuntu 14.04 fails
compilation with

$ g++-trunk -std=c++11 -Wall -Wextra constexpr_static_assert.ii
constexpr_static_assert.cpp:50:39:   in constexpr expansion of ‘get<0, S<int&&>
>((* & S<int&&>((* &1))))’
constexpr_static_assert.cpp:35:35:   in constexpr expansion of ‘__get<0,
T>::value<S<int&&>&&>((* & std::forward<S<int&&> >((* & arg))))’
constexpr_static_assert.cpp:50:44: internal compiler error: in
verify_ctor_sanity, at cp/constexpr.c:1779
 static_assert (get <0> (S <int &&> (1)) == 1, ""); // g++ 4.9 passes, g++
trunk r217559 fails

...

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
//
// source
//

#include <utility>

using namespace std;

///////////////////////////////////////////////////////////////////////////////

template <typename C> struct member_forward
{
    typedef typename remove_reference <C>::type::type T;
    typedef typename conditional
    <
        is_lvalue_reference <C &&>::value && not is_reference <T>::value,
        typename add_lvalue_reference <T>::type,
        T
    >::type type;
};

template <typename C> using member_forward_t = typename member_forward
<C>::type;

///////////////////////////////////////////////////////////////////////////////

template <int  , typename  > struct __get;
template <       typename T> struct __get <0, T> 
{ 
    constexpr static auto value (T arg) 
     -> decltype ((forward <member_forward_t <T>> (arg.t))) 
    {  
        return     forward <member_forward_t <T>> (arg.t); 
    } 
};

template <int N, typename T> constexpr auto get (T && arg)
 -> decltype (__get <N, T &&>::value (forward <T> (arg)))
{
    return    __get <N, T &&>::value (forward <T> (arg));
}

///////////////////////////////////////////////////////////////////////////////

template <typename T> struct S
{
    typedef T type;
    T t;

    template <typename U> constexpr S (U && u) : t (forward <U> (u)) {} 
};

///////////////////////////////////////////////////////////////////////////////

static_assert (get <0> (S <int &&> (1)) == 1, ""); // g++ 4.9 passes, g++ trunk
r217559 fails

int main () {}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
>From gcc-bugs-return-466841-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Nov 15 08:59:20 2014
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/63837] [5 Regression] r217391 causes kernel build errors with GCC_COMPARE_DEBUG=1
Date: Sat, 15 Nov 2014 08:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc837

--- Comment #9 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #8)
> I bet this is really the same as bug 63881.  The kernel is using /dev/null
> for both the input and output when testing if the options work.

No. From scripts/Kbuild.include:

126 # cc-disable-warning
127 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
128 cc-disable-warning = $(call try-run,\
129         $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c
/dev/null -o "$$TMP",-Wno-$(strip $(1)))

[Bug c++/63885] [5 Regression] ICE in static assert of constexpr forwarding xvalue container member rvalue reference

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63885

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-11-18
            Summary|ICE in static assert of     |[5 Regression] ICE in
                   |constexpr forwarding xvalue |static assert of constexpr
                   |container member rvalue     |forwarding xvalue container
                   |reference                   |member rvalue reference
     Ever confirmed|0                           |1

[Bug c++/63885] [5 Regression] ICE in static assert of constexpr forwarding xvalue container member rvalue reference

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63885

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |5.0

[Bug c++/63885] [5 Regression] ICE in static assert of constexpr forwarding xvalue container member rvalue reference

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63885

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed Nov 19 22:06:26 2014
New Revision: 217815

URL: https://gcc.gnu.org/viewcvs?rev=217815&root=gcc&view=rev
Log:
    PR c++/63885
    * constexpr.c (cxx_eval_constant_expression) [PARM_DECL]: Don't
    complain yet about a reference.
    [TARGET_EXPR]: Handle TARGET_EXPR with addr == true.
    [ADDR_EXPR]: Make sure we don't take the address of a CONSTRUCTOR.
    (cxx_bind_parameters_in_call): In the new scheme addr is always false.
    * typeck.c (build_address): Don't take the address of a CONSTRUCTOR.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-ref8.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constexpr.c
    trunk/gcc/cp/typeck.c

[Bug c++/63885] [5 Regression] ICE in static assert of constexpr forwarding xvalue container member rvalue reference

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63885

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |jason at gcc dot gnu.org
         Resolution|---                         |FIXED
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.

[Bug c++/63885] [5 Regression] ICE in static assert of constexpr forwarding xvalue container member rvalue reference

[listcrawler at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63885

--- Comment #3 from listcrawler at gmail dot com ---
I tested the latest revision this morning and all my tests passed. Thanks!