c++/5796: g++ 3.1: template class problem

[snyder@fnal.gov]

>Number:         5796
>Category:       c++
>Synopsis:       g++ 3.1: template class problem
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 28 13:06:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     scott snyder
>Release:        3.1 20020227 (prerelease)
>Organization:
>Environment:
System: Linux karma 2.4.9-13 #1 Tue Oct 30 20:11:04 EST 2001 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../egcs/configure --prefix=/usr/local/egcs --enable-threads=posix --enable-long-long --enable-languages=c,c++,f77
>Description:

g++ gives a bogus error message compiling the source below:

$ cc1plus -quiet x.cc
x.cc: In function `void init_mapping(X<int>*)':
x.cc:9: invalid use of undefined type `struct X<int>'
x.cc:3: forward declaration of `struct X<int>'

Note that the error goes away if the line

  mapping[0].first = 0;

is changed to the equivalent

  mapping->first = 0;


>How-To-Repeat:

---------------------------------------------------------------
template <class T>
struct X
{
  int first;
};

void init_mapping (X<int>* mapping)
{
  mapping[0].first = 0;
}
---------------------------------------------------------------

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