How do I check OS with a preprocessor directive?

Question

I need my code to do different things based on the operating system on which it gets compiled. I\'m looking for something like this:

#ifdef OSisWindows
// do         


        

Answer 1

Microsoft C/C++ compiler (MSVC) Predefined Macros can be found here

I think you are looking for:

• _WIN32 - Defined as 1 when the compilation target is 32-bit ARM, 64-bit ARM, x86, or x64. Otherwise, undefined
• _WIN64 - Defined as 1 when the compilation target is 64-bit ARM or x64. Otherwise, undefined.

gcc compiler PreDefined MAcros can be found here

I think you are looking for:

• __GNUC__
• __GNUC_MINOR__
• __GNUC_PATCHLEVEL__

Do a google for your appropriate compilers pre-defined.