Core with pthread, libc6, and g++ in child processes..

[Richard.Dansereau@EE.UManitoba.CA]

Hello!

I just installed the latest unstable version of Debian on Saturday
and am either doing something wrong or I have found a bug.  On top
of this, I have followed the mini-howto for upgrading from libc5
to libc6 and installed all of the suggested packages.

I've narrowed the problem down to compiling the following code
with g++:


#include <stdio.h>
#include <unistd.h>
#include <pthread.h>

void dummy_function() {
	pthread_mutexattr_t mutexattr;
	pthread_mutexattr_init(&mutexattr);
}

int main() {
	int childpid;

	childpid = fork();
	printf("After fork.. childpid = %d\n", childpid);

	return 0;
}


Now, normally this should run with the following expected output:
	After fork.. childpid = 9909
	After fork.. childpid = 0

But, when I run it I only get
	After fork.. childpid = 9909


>From this, it is obvious that the child process is not actually
running and the child dumps a core file.

I've been compiling this as follows:
	g++ -c file.c
	g++ -o file file.o -lpthread
Now, my understanding was that pthread was supposed to be for libc5,
but, it doesn't seem to compile at all if I don't include this.

I played a little more with this and have found that the following
does work:
	gcc -o file file.o -lpthread -lg++
but, the instant I add in:
	gcc -o file file.o -lpthread -lg++ -lstdc++
(which is what the g++ expands to) and then the same problem occurs.

Any ideas?  I tried adding the -D_REENTRANT option as well as suggested
by the pthreads FAQ but still no success.  And yes, my actual code
is C++ (though this snipit isn't) so compiling it without the g++ and
stdc++ libraries must be done.

Oh, and I should mention some of my current configuration:
	Linux 2.0.29
	libc6 2.0.5c-0.1
	libc6-dev 2.0.5c-0.1
	libg++272 2.7.2.8-0.1
	ldso 1.9.6-2
	libc5 5.4.33-7
	libreadlineg 2.1-7
	libreadline2 2.1-7


Any help or suggestions would be appreciated because otherwise
I'm stuck and can't continue on with my software development.

Cheers!
Richard..

---------------------------------------------------------------------
Richard Dansereau
Email: rdanse@pobox.com          Home page:  http://pobox.com/~rdanse
Electrical and Computer Engineering - University of Manitoba - Canada
---------------------------------------------------------------------


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