GDB: Breakpoint that breaks only after a different breakpoint is hit

Question

Say I create two breakpoints, 2 and 3. Breakpoint 3 is on line 10, which is executed frequently through the program. How can I configure 3 to break only after 2 has been hit once?

Answer 1

with a simple example:

void bp2() { };
void bp1() { bp2(); }

int main()
{
  bp2();
  bp1();
  return 0;
}

we can create a breakpoint which only triggers when bp2 is called through bp1 with something like the following:

break bp1
break bp2

commands 1
silent
enable 2
c
end

commands 2
disable 2
end

disable 2