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Why is __unix__ defined, and not __WINDOWS__ ?

I have noticed that the gcc and clang compilers have defined the preprocessing macro __unix__, but not __WINDOWS__, _WIN32, or _WIN64 when compiling a windows executable. 

Why is this?
A C/C++ program will check for these macros if it wants to know which operating system you are compiling for, and this will give the wrong result. 




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