title: Enabling ifdef macro used in the static library
body: <p>Can you use macros defined in static libraries?</p>
  
  <p>I have my own debug macro called <code>TWDEBUG</code> that I use in a static library I create for sharing.
  If I import the static library to my new project and use it, the compiler does not seem to recognize it. I did set up preprocessor macros to <code>TWDEBUG</code> and <code>Other C flags</code> and <code>Other C++ flags</code> to <code>-TWDEBUG</code>, but when I ran the code the <code>ifdef</code> macro doesn't get executed.</p>