How to detect reliably Mac OS X, iOS, Linux, Windows in C preprocessor? [duplicate]

https://stackoverflow.com/questions/5919996

c++
c
cross-platform
c-preprocessor
os-detection

29-10-2019
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문제

This question already has an answer here:

How do I check OS with a preprocessor directive? 16 answers

If there's some cross-platform C/C++ code that should be compiled on Mac OS X, iOS, Linux, Windows, how can I detect them reliably during preprocessor process?

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