Is there any way to set a breakpoint in gdb that is conditional on the call stack?

Question

I am debugging C++ in gdb 7.1 on Linux.

I have a function a() that is called in many places in the code. I want to set a breakpoint in it, but only if

Answer 1

I have tested this on gdb 7.6 that is already available but it does not work on gdb 7.2 and probably on gdb 7.1:

So this is main.cpp:

int a()
{
  int p = 0;
  p = p +1;
  return  p;
}

int b()
{
  return a();
}

int c()
{
  return a();
}

int main()
{
  c();
  b();
  a();
  return 0;
}

Then g++ -g main.cpp

This is my_check.py:

class MyBreakpoint (gdb.Breakpoint):
    def stop (self):
        if gdb.selected_frame().older().name()=="b":
          gdb.execute("bt")
          return True
        else:
          return False

MyBreakpoint("a")

And this is how it works:

4>gdb -q -x my_check.py ./a.out
Reading symbols from /home/a.out...done.
Breakpoint 1 at 0x400540: file main.cpp, line 3.
(gdb) r
Starting program: /home/a.out
#0  a () at main.cpp:3
#1  0x0000000000400559 in b () at main.cpp:10
#2  0x0000000000400574 in main () at main.cpp:21

Breakpoint 1, a () at main.cpp:3
3         int p = 0;
(gdb) c
Continuing.
[Inferior 1 (process 16739) exited normally]
(gdb) quit