Enable compiler output pane in Codeblocks

go to view -> perspective -> and enable code::Blocks default, you can see your projects left side and down the build logs and messages etc.

Press F2 to enable Logs panel. Select "Build log" in it.

Or go to menu: View -> Logs

Have a good developing!

If after hitting F2, you don't see "Log & others" tab

You need choose: "View" ==> "Perspective" ==> "Delete current"