How do I enable optimizations in GCC?

How do I enable optimizations in GCC?

You can enable optimizations in GCC by using the -O flag followed by a level (e.g., -O1, -O2, -O3, or -Os). Which level are you interested in?

What's the difference between -O2 and -O3?

-O2 enables a good level of optimization without significantly increasing compilation time, while -O3 enables more aggressive optimizations that can improve performance but may increase compile time and binary size.

Are there any specific flags I should use with -O3?

Yes, you might consider using -ffast-math for floating-point optimizations or -funroll-loops to unroll loops for better performance. However, be cautious as these can affect precision.

Can I enable optimizations for specific files only?

Yes, you can compile specific files with different optimization levels by specifying the -O flag for each file in your build command.