Re: Link problems in g++ but not in gcc!!

[Eljay Love-Jensen <eljay@adobe.com>]

Hi L.Suresh,

CAVEAT!

If you make an "ipq.hpp" header file that only contains this...
extern "C" {
#include "ipq.h"
}

...that's just fine if ipq.h does not, itself, include any header files.

But if it does include any header files, your ipq.hpp should include those 
header files first.  And you should use the same guard that ipq.h uses -- 
but don't DEFINE it, just trigger off of it.
#ifndef ipq_h_once
#include "alpha.h"
#include <stdio.h>
extern "C" {
#include "ipq.h"
}
#endif

You don't want to compromise those other header files by extern "C"-ing them.

If the made-up "alpha.h" is, itself, in the same boat, then do this...
#ifndef ipq_h_once
#include "alpha.hpp" // "C" wrapper around alpha.h
#include <stdio.h>
extern "C" {
#include "ipq.h"
}
#endif

It can turn into a mighty be can-o'-worms if there are lots and lots of 
header files.  Might be easier to instrument (edit) the C header files with 
the...
#ifdef __cplusplus
extern "C" {
#endif

HTH,
--Eljay