profiling shared libraries with gprof

[Kunal Parmar]

Hello,

I am trying to profile a shared library with gprof without much success
and after a lot searching found me no answer, I am asking this question
on the mailing list.

Here are the files I am using :

--- the shared library 
#include <stdio.h>

int a(void) {
  int i=0,g=0;
  while(i++<100000)
  {
     g+=i;
  }
  return g;
}
int b(void) {
  int i=0,g=0;
  while(i++<400000)
  {
    g+=i;
  }
  return g;
}

--- the application
#include <stdio.h>
#include <stdlib.h>

int a();
int b();

int main(int argc, char** argv)
{
   int iterations;

   if(argc != 2)
   {
      printf("Usage %s <No of Iterations>\n", argv[0]);
      exit(-1);
   }
   else
      iterations = atoi(argv[1]);

   printf("No of iterations = %d\n", iterations);

   while(iterations--)
   {
      a();
      b();
   }
}


The steps I follow to compile and run are :
gcc  -g -pg -fPIC -c foo.c
gcc  -g -pg -shared foo.o -o libfoo.so
gcc  bar.c -L/home/kunal/tmp/gprof -Wl,-rpath=/home/kunal/tmp/gprof
-lfoo -o bar

LD_PROFILE=libfoo.so LD_PROFILE_OUTPUT=`pwd` ./bar 10000

This generates the file libfoo.so.profile as expected. But when I run
gprof, I get the following error :

gprof: file `libfoo.so.profile' has unsupported version 131071

I am using gprof version 2.17.

I have attached the code along with a Makefile with this mail. Any help
with this is highly appreciated.

Please add me to the CC list since I have not subscribed to the mailing
list. 

Thanks in advance.
-- 
Kunal Parmar
Tools Team,
Celunite Inc. (www.celunite.com)