Continue an iteration in C++ until a specific iteration number in gdb

Question

I am using gdb-7.0.1 and I think I have detected a bug in a certain section of my code, which has a for loop. The for loop looks like

for (int i=0 ; i< end ; ++i )
{
   //Code here.
}

Here end is a very large integer. The code does not crash at the first iteration, and seems to crash somewhere at iteration number end/2.

Since I want to understand the behaviour of the code at iteration number end/2 , just stepping and nexting from i=0 till I reach this iteration point, is unfeasible.

Is there a way to tell gdb to continue through a for loop till i gets the value end/2 and then wait for the user to manually step through iteration number end/2?

I am using gcc-4.5.2 on Ubuntu Linux

Answer 1

Here's a tutorial on conditional breakpoints with gdb.

I'm guessing you didn't know the term for this, otherwise it would have been easy to google.

Answer 2

When you set the breakpoint it'll give you a breakpoint number (for the moment, let's assume it's 1). You'll then make that breakpoint conditional, something like:

condition 1 i==end/2