Re: c++/6785: Core dump from g++ 3.0.4 (on Linux)

[James Kanze <kanze@gabi-soft.de>]

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The following reply was made to PR c++/6785; it has been noted by GNATS.

From: James Kanze <kanze@gabi-soft.de>
To: gcc-gnats@gcc.gnu.org
Cc: nobody@gcc.gnu.org
Subject: Re: c++/6785: Core dump from g++ 3.0.4 (on Linux)
Date: 24 May 2002 12:31:47 +0200

 gcc-gnats@gcc.gnu.org writes:
 
 |>  It has the internal identification `c++/6785'.
 
 I've got a much, much smaller example which triggers the error:
 
 ---------------------------------------------------
 
 #include <cstddef>
 
 template< typename T, size_t N >
 size_t
 size( T (&a)[ N ] )
 {
     return N ;
 }
 
 void
 f()
 {
     static char const   s[] = "abc" ;
     int                 buf[ size( s ) ] ;
     size_t              r = size( buf ) ;
 }
 ---------------------------------------------------
 
 I was unintentionally using a g++ extension, but the problem occurs
 when I try and instantiate a template similar to the above on an array
 with non-constant bounds.
 
 This should IMHO be an error -- the standard requires that the
 instantiation value for a template be a compile time constant, and
 with variable length arrays, the length of the array is NOT.
 
 The easiest fix would be to just turn off support for variable length
 arrays in g++.  I don't think that that is acceptable, however, as it
 would break existing code.
 
 -- 
 James Kanze                                mailto:kanze@gabi-soft.de
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