title: Is there any way to have eclipse recognise virtual defines per build configuration?
body: <p>I am working on an inherited Borland C/C++ project and a lot of the project's functionality is hidden away behind #ifdefs which rely on defines passed to the compiler.
  I have been trying to get eclipse to activate these sections by using per-configuration symbols however when i view the source files, large sections are still greyed out.
  Is there any way to tell eclipse about these defines so I can change my build configuration and see which sections of code are being compiled properly?</p>