What C preprocessor conditional should I use for OS X specific code?

Question

What C preprocessor conditional should I use for OS X specific code? I need to include a specific library if I am compiling for OS X or a different header if I am compiling for Linux.

I know there is __APPLE__ but I don't know if that is a current conditional for OS X 10.x.

Answer 1

If I remember correctly, it's __APPLE__ :)

Answer 2

This list of operating system macros says the presence of both __APPLE__ and __MACH__ indicate OSX.

Also confirmed at line 18 of part of the source for fdisk.

Answer 3

__APPLE__ will tell you you're compiling on an Apple platform. Unless you need to support MacOS versions before OS X, that should be good enough. Alternately, you could use __APPLE__ and __MACH__ to make sure you're compiling on OS X.