[英]MinGW not defining WIN32, error in preprocessor directives
I am using mingw32-make to compile a project to Windows, which depends on a project called libevent2. 我正在使用mingw32-make将项目编译到Windows,这依赖于一个名为libevent2的项目。 I keep receiving this error -
我一直收到这个错误 -
util.h:69:25: fatal error: sys/socket.h: No such file or directory
Obviously a file from the Linux API is trying to be included, which won't work on Windows. 显然,试图包含来自Linux API的文件,这在Windows上不起作用。 Upon further investigation I find however that this file should only be included if WIN32 isn't defined.
经过进一步调查,我发现只有在未定义WIN32时才应包含此文件。
#ifdef WIN32
#include <winsock2.h>
#else
#include <sys/socket.h>
#endif
你应该使用_WIN32
,也可能想检查__CYGWIN__
#if defined _WIN32 || defined __CYGWIN__
Are you sure there's nothing undefining WIN32
? 你确定
WIN32
没有什么定义吗? My installation of MinGW (4.6.1 at this site) definitely defines it: 我在这个网站上安装MinGW(4.6.1)肯定定义了它:
C:\temp>gcc -E -dM test.c | find /i "win"
#define _WIN32 1
#define __WINT_MAX__ 65535
#define _WINT_T
#define __WINT_MIN__ 0
#define __WIN32 1
#define __WINNT 1
#define __WINNT__ 1
#define __WIN32__ 1
#define __SIZEOF_WINT_T__ 2
#define WIN32 1 // <-- right here
#define __WINT_TYPE__ short unsigned int
#define WINNT 1
Try passing the -E -dM
options to verify if your MinGW compiler is (or isn't) pre-defining the WIN32
macro. 尝试传递
-E -dM
选项以验证您的MinGW编译器是否(或不是)预定义WIN32
宏。
Note that strictly speaking, WIN32
should not be predefined by the compiler (since it's in the user's namespace) - only _WIN32
should. 请注意,严格来说,
WIN32
不应该由编译器预定义(因为它在用户的命名空间中) - 只有_WIN32
应该。 WIN32
should be set by the SDK being used and/or by the build environment - that's the way it works in Microsoft's compilers. WIN32
应该由正在使用的SDK和/或构建环境设置 - 这就是它在Microsoft的编译器中的工作方式。
For example, there's the following sequence in windef.h
" 例如,
windef.h
有以下顺序“
#ifndef WIN32
#define WIN32
#endif
and /D "WIN32"
is put into Visual Studio C++ projects by default. 和
/D "WIN32"
默认放入Visual Studio C ++项目中。
See https://stackoverflow.com/a/662543/12711 for more details. 有关详细信息,请参阅https://stackoverflow.com/a/662543/12711 。
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