Does gmcs or xbuild predefine any properties? [duplicate]

Question

This question already has answers here:

How can I conditionally compile my C# for Mono vs. Microsoft .NET? (2 answers)

Closed 8 years ago.

I'm porting some .NET code to mono, which involves #if blocks like:

#if !MONO
// Stuff that only works in >NET
#endif

I can define these things in the csproj file and set a mono build target. However, I was wondering if xbuild or gmcs predefined anything so I know if I'm compiling on mono.

Answer 1

Short answer: no. There's no default flag.

For gmcs, use gmcs -d:MONO. If you build using xbuild, you can set the flag in the .csproj.