在Linux上与mingw-w64交叉编译时的声明冲突

Question

我一直在试图找出我在Linux for Windows上交叉编译C ++代码时遇到的问题。 我尝试编译的代码是：

#include <iostream>

int main(int argc, char** argv){
    std::cout<<"Hello World!\n";
    return 0;
}

我正在尝试为64位Windows安装进行编译，因此我运行：

x86_64-w64-mingw32-g++ main.cpp

但是会产生以下错误：

In file included from /usr/include/sched.h:34:0,
                 from /usr/include/pthread.h:23,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/x86_64-w64-mingw32/bits/gthr-default.h:35,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/x86_64-w64-mingw32/bits/gthr.h:148,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ext/atomicity.h:35,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/bits/ios_base.h:39,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ios:42,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ostream:38,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/iostream:39,
                 from main.cpp:1:
/usr/include/time.h:75:18: error: conflicting declaration ‘typedef __time_t time_t’
 typedef __time_t time_t;
                  ^
In file included from /usr/x86_64-w64-mingw32/include/stddef.h:7:0,
                 from /usr/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stddef.h:1,
                 from /usr/include/wchar.h:51,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/cwchar:44,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/bits/postypes.h:40,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/iosfwd:40,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ios:38,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ostream:38,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/iostream:39,
                 from main.cpp:1:
/usr/x86_64-w64-mingw32/include/crtdefs.h:138:20: note: previous declaration as ‘typedef __time64_t time_t’
 typedef __time64_t time_t;
                    ^
In file included from /usr/x86_64-w64-mingw32/include/c++/4.9.2/cwctype:50:0,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/bits/locale_facets.h:39,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/bits/basic_ios.h:37,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ios:44,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ostream:38,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/iostream:39,
                 from main.cpp:1:
/usr/include/wctype.h:52:27: error: conflicting declaration ‘typedef long unsigned int wctype_t’
 typedef unsigned long int wctype_t;
                           ^
In file included from /usr/x86_64-w64-mingw32/include/stddef.h:7:0,
                 from /usr/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stddef.h:1,
                 from /usr/include/wchar.h:51,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/cwchar:44,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/bits/postypes.h:40,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/iosfwd:40,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ios:38,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/ostream:38,
                 from /usr/x86_64-w64-mingw32/include/c++/4.9.2/iostream:39,
                 from main.cpp:1:
/usr/x86_64-w64-mingw32/include/crtdefs.h:107:24: note: previous declaration as ‘typedef short unsigned int wctype_t’
 typedef unsigned short wctype_t;
                        ^

错误行：

/usr/include/time.h:75:18: error: conflicting declaration ‘typedef __time_t time_t’
 typedef __time_t time_t;

对我来说，mingw-w64正在使用linux库，而不是为Windows编译的库，但是在搜索时，我似乎无法弄清楚如何解决此问题。 我正在使用来自官方存储库的Archlinux和mingw-w64软件包组。 我尝试重新安装mingw-w64软件包组，以为这些库可能未正确编译，但我仍然收到相同的错误。

需要明确的是，我可以使用以下代码编译该代码：

g++ main.cpp

任何帮助或任何指向我正确方向的帮助将不胜感激。 谢谢。

Answer 1

您似乎允许mingw-w64编译器搜索本机linux-gnu编译器的头文件树。 这是完全错误的。 这些头专门用于编译本机代码。 您绝对不能让交叉编译器看到它们。 每个单独的编译器（本机和交叉编译器）都将具有其自己特定的系统头集。 应该允许每个人仅看到属于自己的那些。

您似乎也对库和标头的各自角色感到困惑。 图书馆仅在链接时才起作用； 它们在编译过程中不起作用。 标头描述了库提供的功能； 这些描述是编译器使用的。 使用这些库的是链接器。 链接器是一个单独的程序，通常在完成编译过程后由编译器驱动程序调用。

Answer 2

问题是，有一个mingw-w64用于查找linux头文件的环境变量集。 具体来说，我前CPLUS_INCLUDE_PATH在.bashrc设置了CPLUS_INCLUDE_PATH ，却忘记了。 除非在某些特殊情况下需要，否则通常不需要设置此变量。 我个人不依靠它。 我注释了导出，编译器似乎正在查找它现在需要的所有标头。