코드블럭에서 can't find compiler executable in your search path (GNU GCC compiler) 에러 발생시

I had the same problem, and now i'm good to go.

Download this http://sourceforge.net/projects/mingw/?source=dlp
   That's the compiler that isn't actually there, you need to have it installed in order to use it.
When installing i checked the c++ option for when i eventually learn enough to move up to it.
   After installation is complete open CodeBlocks.
Go to settings>Compiler>ToolChainExecutables and click the auto-detect button, and it should now detect the compiler you have just installed.

   Hope this is to some use  "This is all assuming you are using Windows btw"

For future readers, When you download codeblocks, the first two options do not download the compiler with it. The third 4th do.