title: makefile: how to compile fast
body: <p>I am using GCC 4.7 and compiling my C++ code-project. The code consists of files distributed in directories.</p>
  
  <p>On RHEL server I use, there are 16 cores, still the compilation speed is quite slow. Can you suggest possible alternatives or options of makefile, which may help in compiling fast. I have tried -j but it only compiles some folders and stops; does not compile the main binary.</p>
  
  <p>I will be grateful for any help.</p>