template expansion problem

[Anthony Shipman <als at tusc dot com dot au>]

This is with egcs 1.0.1 on Linux, Redhat 4.2.

I compile using:

g++ -pipe -gstabs -O0 -g -fno-implicit-templates -o x.o -c x.cc
g++ -pipe -gstabs -O0 -g -o x2.o -c x2.cc
g++ -pipe -gstabs -O0 -g -o x x.o x2.o

and I get

x.cc:13: undefined reference to `__hashtable_iterator<pair<char const *const,
int>, char const *, hash<char const *>, select1st<pair<char const *const, int>
>, equal_to<char const *>, __default_alloc_template<false, 0>
>::operator++(void)'
collect2: ld returned 1 exit status

The sources are shown below.  Using nm, I see that x2.o contains the
constructor for the __hashtable_iterator instance but not the
operator++(void).

If I build x from x.cc using

g++ -pipe -gstabs -O0 -g -o x.o -c x.cc
g++ -pipe -gstabs -O0 -g -o x x.o

then it all works fine. nm on x.o shows the operator++.


x.cc
----------------------------------
#include	<hash_map.h>


typedef hash_map<const char*, int>	MyMap;

int
main()
{
    MyMap	map;

    map["abc"] = 3;
    map["fred"] = 42;

    for(MyMap::iterator iter = map.begin();
	iter != map.end();
	iter++)
    {
	cout << "mymap[" << iter->first << "] = " << iter->second << endl;
    }

    return 0;
}


x2.cc
-----------------------------------
#include	<hash_map.h>

template class hash_map<const char*, int>;

-- 
Anthony Shipman                 "You've got to be taught before it's too late,
TUSC Computer Systems Pty Ltd    Before you are six or seven or eight,
666 Doncaster Rd, Doncaster      To hate all the people your relatives hate,
Melbourne, Australia, 3108       You've got to be carefully taught."  R&H