Visual Studio trying to include linux headers despite if statement

问题

I am attempting to create a robust header file that will compile on both windows and linux without need for changes. To this end I have an if statement in my includes that looks like

#if (!defined(__WINDOWS__))
#include <sys/time.h>
#include <unistd.h>
#include <pthread.h>
#endif

I am having problems with visual studio still attempting to include these headers despite the if statement resulting in errors like

error C1083: Cannot open include file: 'sys/time.h'

Is there a way to resolve this issue without removing all the linux blocks of code from the header?

回答1:

__WINDOWS__ is defined by windows.h. So you have a circularity. Use this instead:

#if defined(_WIN32)
#   if defined(_WIN64)
        /*64 bit windows*/
#   else
        /*32 bit windows*/
#   endif
#endif

Yes, _WIN32 is defined on 64 bit windows. I kid you not.

来源：https://stackoverflow.com/questions/22384020/visual-studio-trying-to-include-linux-headers-despite-if-statement