Date: Fri, 20 May 1994 13:27:46 -0600
From: Mike Romberg <romberg AT spot DOT Colorado DOT EDU>
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: problems with ar / ld

  I am having a problem which involves g++ and Gnu versions of ar and ld.
This problem does not seem to be specific to djgpp but I thought
someone out there might be able to help me out.
  What I amd trying to do involves two libraries which are to be linked into
a third bit of code.  Some sample code ( which demonstrates my problem )
look like :

================lib1.a sources============================
---file1.h------
class A {
public:
  virtual void fn1( void );
protected:
  virtual void fn2( void ){}
};

class B : public A {
protected:
  void fn2( void );
};

----file1.cc------
#include "file1.h"
#include <iostream.h>

void A::fn1( void ){
  cerr <<"A::fn1() calling fn2" <<endl;
  this->fn2();
}

void B::fn2( void ){
  cerr <<"B::fn2()" <<endl;
}

================lib2.a sources==============================
---file2.h-----
#include "file1.h"

extern B b;

---file2.cc----
#include "file2.h"

B b;

===============main program==================================
---main.cc---
#include "file2.h"
#include <iostream.h>


main()

{
  cerr <<"main() calling b.fn1()" <<endl;
  b.fn1();
}

===============end=================================================


  The libraries are created using the following :

	ar crs lib1.a file1.o
	ar crs lib2.a file2.o

  And the program is made with :

	g++ main.cc -l1 -l2

  This all works fine ( no warnings or errors ), but when the binary is run
the following happens:

smaug > a.out
main() calling b.fn1()
A::fn1() calling fn2
Segmentation fault 


  So I am wondering if I am making an error in the use of the library tools, or
there is a bug in g++, ar, or ld.  The program does run as expected if the
object files are all linked directly ( ex g++ *.o ). Any help would be 
appreciated.


Mike Romberg ( romberg AT spot DOT colorado DOT edu )