callgraph not working

Dear all,
I am encountering a problem when trying to produce a callgraph on Debian 8, on an x86_64 machine.
The problem is basically what is described here: https://sourceforge.net/p/oprofile/mailman/message/24408843/

Basically I cannot produce a callgraph. The solution proposed in the thread I linked (i.e. compiling with the -fno-omit-frame-pointer) does not seem to help.

The symptoms: running `operf ./foo` and then `opreport -cl ./foo` outputs a callgraph made of single calls, with no depth (like in the thread linked above).
Running `operf --callgraph ./foo` and then `opreport -cl ./foo` outputs "get_symbol_by_filepos: no symbols at all?" and aborts.
In both cases, `opreport -l ./foo` works fine and finds the right symbols.

I copy below my test program, which I compiled with gcc 4.9.2 on Debian 8, both with `gcc -fno-omit-frame-pointer -g foo.cpp` and `gcc -O0 -g foo.cpp`,
with the results described above.

Cheers,
blue


##### foo.cpp  #######
void loop(unsigned int n) {
   for(unsigned int i=0; i<n; ++i);
   return;
}

void slow_f() {
   for(unsigned int i=0; i<1000000000; ++i);
   loop(1000000000);
   return;
}

int main() {
   slow_f();
   return 0;
}

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