On Sat, Dec 01, 2007 at 01:59:59PM +0100, Thomas Klausner wrote:
> It seems to me that libc.so.12.155 and libc.so.12.156 are not binary
> compatible.

It's worse. Try compiling the following program:
#include <stdio.h>
int main() { printf("Ok\n"); return(0); }

with the following command line:
cc -o try -O2 -pthread -I/usr/include -fno-strict-aliasing -pipe
-Wdeclaration-after-statement try.c -lm -lcrypt -lpthread

(That's from perl's configure process)

And run it -- it will dump core for the same reason.
 Thomas