[Bug c++/60430] New: static_assert and reference to const/constexpr

[Bug c++/60430] New: static_assert and reference to const/constexpr

[florent.hivert at lri dot fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60430

            Bug ID: 60430
           Summary: static_assert and reference to const/constexpr
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: florent.hivert at lri dot fr

I think the following should be accepted:


constexpr const int A = 42;
const int &B = A;
static_assert(&A == &B, "Bug");

int main() {return 0;}


Indeed, even if B is not constexpr its address is. On the contrary GCC
complains with


bug2.cpp:3:1: error: non-constant condition for static assertion
 static_assert(&A == &B, "Bug");
 ^
bug2.cpp:3:1: error: the value of ‘B’ is not usable in a constant expression
bug2.cpp:2:12: note: ‘B’ was not declared ‘constexpr’
 const int &B = A;
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/60381] [4.9 Regression] ICE: in vt_expand_var_loc_chain, at var-tracking.c:8245
Date: Wed, 05 Mar 2014 16:12:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`381

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I admit I haven't timed the insn-recog.c compilation time with my patch, but I
haven't noticed that the compile time would increase significantly.  I guess I
can benchmark it now.

[Bug c++/60430] static_assert and reference to const/constexpr

[florent.hivert at lri dot fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60430

Florent Hivert <florent.hivert at lri dot fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|4.8.1                       |4.9.0

--- Comment #1 from Florent Hivert <florent.hivert at lri dot fr> ---
The problem remains with the newly released GCC 4.9.0. I've upgraded the tag.

[Bug c++/60430] static_assert and reference to const/constexpr

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60430

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|4.9.0                       |4.8.1

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
THere's no need to update the version - if the bug is still open t hat means
it's still a bug in later versions, and by changing it you've lost the
information that the bug is present in 4.8

[Bug c++/60430] static_assert and reference to const/constexpr

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60430

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-08-29
     Ever confirmed|0                           |1