From: "Tanes Sriviroolchai" <Tanes DOT Sriviroolchai AT Thailand DOT NCR DOT COM>
Newsgroups: comp.os.msdos.djgpp
Subject: Different behavior of gcc in DJGPP from other systems
Date: Fri, 19 Jan 2001 10:50:26 +0700
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,
   I'm not sure about the error I get. During manage STLport4.0 to be
compiled with DJGPP, I found an error of template instantiation that can be
decribed by the following short program:


#include <iostream.h>
#include <float.h>

namespace myname {

union _D_rep
{
 unsigned short rep[4];
 double  val;
};

template <class __dummy>
class _LimG
{
public:
 static const _D_rep _D_inf;
};

template <class __dummy>
const _D_rep _LimG<__dummy>::_D_inf = {{0,0,0x7ff0,0}};

};

main()
{
 cout << myname::_LimG<bool>::_D_inf.val;

 return 0;
}

when compile by gcc -ftemplate-depth-32 -c a.cc
and link by gcc -o a.exe a.o -lstdcxx
I get link error as shown below:

a.o(.text+0xb):a.cc: undefined reference to `myname::_LimG<bool>::_D_inf
collect2: ld returned 1 exit status

I use gcc 2.95.2, djdev 2.03.
This short program can be compiled and linked successfully with the same
options in other systems of gcc 2.95.2 such as Linux, FreeBSD, SysV. This
short program can be compiled successfully on DJGPP also if I specify -frepo
during compile. This could leads to a problem while moving some codes into
library. Could someone please tell me the reason.

Regards,
Tanes Sriviroolchai