[Mono-list] Making code conditional on "not running on mono"?

[Jonathan Pryor]

<snip/>
> Question to the Mono developers: Would it be worth making "/d:mono" or 
> "/d:mcs" a default in mcs? That would make it possible to write code 
> that compiles differently on Mono without having to specialcase your 
> build scripts.

This already exists.  From the man page:

   NOTES
       During compilation the MCS compiler defines the __MonoCS__
       symbol, this can be used by pre-processor instructions to compile
       Mono  C#  compiler specific code.

 - Jon