How does Sparky support Windows' DLL exports in the context of Unix systems?

[twaritwaikar]

I am aware of the how and why function definitions are exported to DLLs in Windows using __declspec(). However, I don't seem to know how it is done on non-Windows platforms.

Since Sparky is cross-platform, I went ahead and saw how SP_API macro is defined in Common.h but I don't see any definitions for non-Windows systems.