Compiling in g++ for gprof

Question

I do not understand the documentation for gprof regarding how to compile your program for profiling with gprof. In g++, is it required to compile with the -g option (debugging information) in a addition to the -pg option or not. In each case I get different results, and I would like to see where the bottlenecks in my application are in release mode, not in debug mode, where many optimizations are left out by the compiler (e.g. inlining)

Answer 1

The documentation shows that you can do either, noting that you need -g for line by line profiling. So if you want to profile under release conditions, and can accept not doing line-by-line, you should be able to compile without -g.