How do I use a Cygwin based compiler?

[ET]

I want to use a compiler that runs under cygwin. I set up the paths, but I get "Execution of ... failed". I suspect it's because it's not a normal Windows executable. How would I set this up to compile? (Same with debugging, BTW.) Thanks!

[oBFusCATed]

Do you use the cygwin compiler preset or you've modified the mingw preset?
You should use the Cygwin one...

[ET]

I didn't remember how I created it, so I created a new one as a copy of Cygwin GCC. I get the same problem.

How does Code::Blocks know that it needs to execute things under Cygwin, and how does it run them? Should I see Cygwin invoked in the build log?