[Boost-users] Why is BOOST_OS_WINDOWS defined on Linux

Subject: [Boost-users] Why is BOOST_OS_WINDOWS defined on Linux
From: David Demelier (markand_at_[hidden])
Date: 2018-05-03 18:48:54

Hello,

Everything is in the title, the following code compiles and shows
"Windows" even though I'm running Fedora 28. I can't understand.

    #include <iostream>
    
    #include <boost/predef.h>
    
    int main()
    {
    #if defined(BOOST_OS_WINDOWS)
        puts("Windows");
    #endif
    }

I'm using Boost 1.66 with GCC 8.0.1.

Regards,

-- 
David