Enabling/Disabling feature specific flags for compiling

Question

This is in regard to the post https://stackoverflow.com/a/4171484/1220659

I want to know where and how to enable the flag UNIT_TEST. I guess, it has something to do with makefile. But I am completely a newbie in this.

Answer 1

http://www.google.com/search?q=add+%23define+to+makefile

If you're using Visual Studio:

http://msdn.microsoft.com/en-us/library/hhzbb5c8%28v=vs.80%29.aspx

Answer 2

I got what I am looking for, I just have to add -D option with the flag in the makefile.