Re: c++/10790: g++/gcc

Re: c++/10790: g++/gcc

[Andrew Pinski]

The following reply was made to PR c++/10790; it has been noted by GNATS.

From: Andrew Pinski <pinskia@physics.uc.edu>
To: lgang@yahoo.com, "Gcc-Bugs@Gcc. Gnu. Org" <gcc-bugs@gcc.gnu.org>
Cc: Andrew Pinski <pinskia@physics.uc.edu>, gcc-gnats@gcc.gnu.org
Subject: Re: c++/10790: g++/gcc
Date: Wed, 14 May 2003 15:09:40 -0400

 This is a GCC extension so it is not a bug, use -pedantic or 
 -pedantic-errors to see that they are not accepted.
 I get some warnings or errors if -pedantic-errors:
 
 test2.cc: In function `int main()':
 test2.cc:7: warning: ISO C++ forbids variable-size array `arr'
 test2.cc:9: warning: ISO C++ forbids variable-size array `arr2'
 
 Thanks,
 Andrew Pinski
 
 PS can someone close this bug as it is not really a bug but a 
 misunderstanding of GCC extensions.
 
 
 On Wednesday, May 14, 2003, at 13:59 US/Eastern, lgang@yahoo.com wrote:
 
 >
 >> Number:         10790
 >> Category:       c++
 >> Synopsis:       g++/gcc
 >> Confidential:   no
 >> Severity:       serious
 >> Priority:       medium
 >> Responsible:    unassigned
 >> State:          open
 >> Class:          sw-bug
 >> Submitter-Id:   net
 >> Arrival-Date:   Wed May 14 18:06:00 UTC 2003
 >> Closed-Date:
 >> Last-Modified:
 >> Originator:     lgang@yahoo.com
 >> Release:        G++ 3.2
 >> Organization:
 >> Environment:
 > Solaris 8
 >> Description:
 > Should a non-constant array be allowed in C/C++? I guess not.  See the 
 > following code.
 >
 > int main()
 > {
 >   int c;
 >   scanf("%d", &c);
 >   int arr[c];
 >   int p;
 >   char arr2[c];
 >   int another;
 >   printf ("Terrible, diff=%d, diff=%d\n",
 > 			 (char*)&c-(char*)&p, (char*)&p - (char*)&another);
 >   return 0;
 > }
 >
 > Seems that compiler treats it int arr[c] as int *arr.  I don't think 
 > it should compile.
 >
 > Thanks
 >> How-To-Repeat:
 >
 >> Fix:
 >
 >> Release-Note:
 >> Audit-Trail:
 >> Unformatted:
 >
 >
 

Re: c++/10790: g++/gcc

[bangerth]

Synopsis: g++/gcc

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Wed May 14 21:02:11 2003
State-Changed-Why:
    Not a bug but a gcc extension

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10790

c++/10790: g++/gcc

[lgang]

>Number:         10790
>Category:       c++
>Synopsis:       g++/gcc
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 14 18:06:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     lgang@yahoo.com
>Release:        G++ 3.2
>Organization:
>Environment:
Solaris 8
>Description:
Should a non-constant array be allowed in C/C++? I guess not.  See the following code.

int main()
{
  int c;
  scanf("%d", &c);
  int arr[c];
  int p;
  char arr2[c];
  int another;
  printf ("Terrible, diff=%d, diff=%d\n",
			 (char*)&c-(char*)&p, (char*)&p - (char*)&another);
  return 0;
}

Seems that compiler treats it int arr[c] as int *arr.  I don't think it should compile.

Thanks
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: