[WinAVR-users] [ winavr-Bugs-2528856 ] pointers in constant-expressions and as template parameters

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Bugs item #2528856, was opened at 2009-01-22 09:16
Message generated for change (Comment added) made by arcanum
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Category: GCC
Group: None
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Private: No
Submitted By: Michael Kochnev (st1ng)
Assigned to: Nobody/Anonymous (nobody)
Summary: pointers in constant-expressions and as template parameters

Initial Comment:
avr-c++ compiler v4.3.0

const int i1 =  0;
int* const pi = ( int* )i1;         // cast int to pointer
const int i2 =  ( int )( int* )i1;  // only cast to pointer and back to int

template< int i > class SomeTemplate
{
};

template< int* p > class AnotherTemplate
{
};

enum SomeEnum
{
  entry_1 = i1,         // ok
  entry_2 = ( int )pi,  // error: 'pi' cannot appear in a constant-expression
  entry_3 = i2          // error: 'i2' cannot appear in a constant-expression
};

SomeTemplate< 0 >             st; // ok
SomeTemplate< i1 >            st1;// ok
SomeTemplate< ( int )pi >     st2;// error: 'pi' cannot appear in a constant-expression
SomeTemplate< i2 >            st3;// error: 'i2' cannot appear in a constant-expression

AnotherTemplate< ( int* )0 >  at; // error: a cast to a type other than an integral or enumeration type cannot appear in a constant-expression
AnotherTemplate< ( int* )i1 > at1;// error: a cast to a type other than an integral or enumeration type cannot appear in a constant-expression
AnotherTemplate< pi >         at2;// error: 'pi' cannot appear in a constant-expression
AnotherTemplate< ( int* )i2 > at3;// error: 'i2' cannot appear in a constant-expression


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Comment By: Eric Weddington (arcanum)
Date: 2010-01-12 17:37

Message:
This needs to be reported to the GCC project at:
http://gcc.gnu.org/bugzilla/

This is not a WinAVR bug. The WinAVR User Manual states that any potential
bugs in the GCC compiler must be reported to the GCC project and not here.

Closed as "Won't Fix."

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=520074&aid=2528856&group_id=68108