title: specify compiler in gyp
body: <p>I am using gyp for the first time and I have already read its online help.
  I have set a compiler using CC option in export variables on command-line(Using cygwin in windows). So, all the files compile properly.
  Now, I wnat to compile few files using a different compiler. So, I am specifying it like this:</p>
  
  <p>'target_name'       : 'LIBADD',</p>
  
  <p>'type'              : 'static_library',</p>
  
  <p>'CC'                : '/cygdrive/c/cygwin/bin/gcc',</p>
  
  <p>But, it still takes the compiler defined using exports for this target as well.</p>
  
  <p>Also, I have got 5 files, for which I need to make object files, specify different different compiler options. Then, i need to make a static library from all these .o file. Is this possible and if how?</p>
  
  <p>Thanks for the help</p>