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* [Bug c++/97401] New: static int has a default value?
@ 2020-10-13 11:17 tangyixuan at mail dot dlut.edu.cn
  2020-10-13 11:38 ` [Bug c++/97401] " redi at gcc dot gnu.org
  0 siblings, 1 reply; 2+ messages in thread
From: tangyixuan at mail dot dlut.edu.cn @ 2020-10-13 11:17 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97401

            Bug ID: 97401
           Summary: static int has a default value?
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tangyixuan at mail dot dlut.edu.cn
  Target Milestone: ---

Hi, the following code declares a static Integer without specific value.
Usually, it will has a default value '0', and thus 'b[a]' could be declared as
b[0] perhaps. However, gcc rejects it while clang accepts.

$ cat s.cpp
template<typename> struct A {  
  static int a;  
  char b[a]; 
};

$ g++ -c s.cpp
s.cpp:3:10: error: size of array ‘b’ is not an integral constant-expression
    3 |   char b[a];

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug c++/97401] static int has a default value?
  2020-10-13 11:17 [Bug c++/97401] New: static int has a default value? tangyixuan at mail dot dlut.edu.cn
@ 2020-10-13 11:38 ` redi at gcc dot gnu.org
  0 siblings, 0 replies; 2+ messages in thread
From: redi at gcc dot gnu.org @ 2020-10-13 11:38 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97401

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to tangyixuan from comment #0)
> Usually, it will has a default value '0', and thus 'b[a]' could be declared
> as b[0] perhaps.

But b[0] would be ill-formed. 

All compilers reject this if you actually instantiate the template, because
it's ill-formed.

^ permalink raw reply	[flat|nested] 2+ messages in thread
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2020-10-13 11:17 [Bug c++/97401] New: static int has a default value? tangyixuan at mail dot dlut.edu.cn
2020-10-13 11:38 ` [Bug c++/97401] " redi at gcc dot gnu.org

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