Problem with static linking

[Hendrik Muhs]

Hi,

I have a problem with static linking. Please look at the following example.

The main programm foo "dlopens" the shared library bar and calls the function 
in bar.

If I compile at least bar.c or foo.c not static:

gcc -o foo foo.c -ldl
gcc -shared -o bar.so bar.c

or 

gcc -static -o foo foo.c -ldl
gcc -shared -o bar.so bar.c

or 

gcc -o foo foo.c -ldl
gcc -shared -o bar.so bar.c -Wl,-static

it works. But if compile both static:

gcc -static -o foo foo.c -ldl
gcc -shared -o bar.so bar.c -Wl,-static

I get a segfault(in malloc):

hendrik@tux:~> ./foo
we are in bar
Segmentation fault

I tried it with different versions of gcc: 2.95.3, 3.0.3(both SuSE Linux 7.3) 
and 2.96(Redhat Linux 7.2)

the code:

//foo.c
#include <stdio.h>
#include <dlfcn.h>
int main (void)
{
  void *lib;
  int (*sym)(void);
  lib = dlopen("./bar.so", RTLD_NOW);
  if (!lib) {
        fputs (dlerror(), stderr);
        exit(1);
  }
  sym = dlsym(lib, "bar");
  (*sym)();
  dlclose(lib);

  return 0;
}

//bar.c
#include <stdlib.h>
#include <malloc.h>
int bar(void)
{
 char *buf;
 printf("we are in bar\n");
 buf = malloc(5);
 printf("return to foo\n");
 return 0;
}

Why does it segfaults?

Thanks in advance,

Hendrik