[Bug c++/51373] New: ICE for static pointer to member initialized in-class

[Bug c++/51373] New: ICE for static pointer to member initialized in-class

[pubby.8 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373

             Bug #: 51373
           Summary: ICE for static pointer to member initialized in-class
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: pubby.8@gmail.com


gcc version 4.7.0 20111112 (experimental) (GCC) 

Two seemingly relate ICEs when dealing with pointer to member:

struct foo {
    int a = 42;
    static int foo::*b = &foo::a;
};
internal compiler error: Segmentation fault

struct foo {
    int a = 42;
    static int foo::*b;
    auto& c = b;
};
internal compiler error: in unify_one_argument, at cp/pt.c:15008

Not sure if the code is valid.

[Bug c++/51373] [C++0x] ICE for static pointer to member initialized in-class

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-12-01
            Summary|ICE for static pointer to   |[C++0x] ICE for static
                   |member initialized in-class |pointer to member
                   |                            |initialized in-class
     Ever Confirmed|0                           |1

[Bug c++/51373] [C++0x] ICE for static pointer to member initialized in-class

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.kruegler at
                   |                            |googlemail dot com

--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-12-03 19:17:09 UTC ---
(In reply to comment #0)
> gcc version 4.7.0 20111112 (experimental) (GCC) 

Also in 4.7.0 20111126 (experimental)

> Two seemingly relate ICEs when dealing with pointer to member:
> 
> struct foo {
>     int a = 42;
>     static int foo::*b = &foo::a;
> };

b needs to have a constexpr specifier here, but it ICEs also with that one
added. Even with the constexpr specifier that declaration should be ill-formed,
because the class definition must be complete for an in-class static data
member initializer. Also, the initializer for a is not needed to reproduce the
error.

> struct foo {
>     int a = 42;
>     static int foo::*b;
>     auto& c = b;
> };
> internal compiler error: in unify_one_argument, at cp/pt.c:15008

The declaration of c cannot use auto (only static data members may do) and the
ICE does no longer occur after the fix. In addition, the declaration of a is
not needed to reproduce the problem.

[Bug c++/51373] [C++0x] ICE for static pointer to member initialized in-class

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373

--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-12-03 19:33:55 UTC ---
(In reply to comment #1)

> Even with the constexpr specifier that declaration should be ill-formed,
> because the class definition must be complete for an in-class static data
> member initializer. 

I just recognize that the class definition must not be complete to make the
pointer of member formation a constant expression. So, the code of the first
example should be well-formed after addition of constexpr to the static data
member.

[Bug c++/51373] [C++0x] ICE for static pointer to member initialized in-class

[vl.still at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373

Vladimír Štill <vl.still at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vl.still at gmail dot com

--- Comment #3 from Vladimír Štill <vl.still at gmail dot com> ---
Created attachment 32899
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32899&action=edit
gcc -v result
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Subject: [Bug c++/51373] [C++0x] ICE for static pointer to member initialized in-class
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373

--- Comment #4 from Vladimír Štill <vl.still at gmail dot com> ---
Problem is still present in 4.8.2, reproduce with following code, which
compiles in clang 3.4 (both with -std=c++11):
struct Y {
    int o;
    static constexpr int Y::* x = &Y::o;
};

gcc -v result included in previous comment. Tested on NixOS linux x86_64.
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Subject: [Bug c++/51373] [C++0x] ICE for static pointer to member initialized in-class
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idQ373

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
      Known to work|                            |4.10.0, 4.9.0
         Resolution|---                         |FIXED
   Target Milestone|---                         |4.9.0

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed in 4.9.0 though

[Bug c++/51373] [C++0x] ICE for static pointer to member initialized in-class

[vl.still at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51373

--- Comment #6 from Vladimír Štill <vl.still at gmail dot com> ---
(In reply to Jonathan Wakely from comment #5)
> Fixed in 4.9.0 though

I'm glad to hear that, I could not yet installed 4.9.0 in my OS.
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Subject: [Bug middle-end/56888] memcpy implementation optimized as a call to memcpy
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idV888

--- Comment #33 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, I'd say we could document that gcc doesn't support any implementations
where memcpy/memmove/memset clobber errno.