我一直试图弄清楚我在Linux for Linux上交叉编译C ++代码时遇到的问题。我正在尝试编译的代码是：
#include <iostream>
int main(int argc, char** argv){
std::cout<<"Hello World!\n";
return 0;
}
我正在尝试编译64位Windows安装，所以我运行：
x86_64-w64-mingw32-g++ main.cpp
但会产生以下错误：
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;
告诉我mingw-w64正在使用linux库而不是为windows编译的库，但在搜索时我似乎无法弄清楚如何解决这个问题。我正在使用Archlinux和官方存储库中的mingw-w64软件包组。我已经尝试重新安装mingw-w64软件包组，认为库可能没有正确编译但我仍然收到相同的错误。
要清楚，我可以使用以下代码编译此代码：
g++ main.cpp
任何帮助或指出正确方向的任何事情都将非常感激。谢谢。
答案 0 :(得分：2)
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。这些标题在编译本机代码时仅供使用;您必须 从不 允许交叉编译器查看它们。每个单独的编译器（本机和交叉编译器）都有自己特定的系统头文件集;应该允许每个人只看到属于自己的那些。
您似乎也对库和标题的各自角色感到困惑。图书馆只在链接时发挥作用;他们不参与编制过程。标题描述了图书馆提供的功能;这些描述由编译器使用。它是使用库的链接器;链接器是一个单独的程序，通常在编译过程本身完成后由编译器驱动程序调用。
答案 1 :(得分：2)
The issue was that there was an environment variable set that mingw-w64 was using to find the linux header files. Specifically, I had set CPLUS_INCLUDE_PATH in my .bashrc a while ago and had forgotten about it. This variable does not generally need to be set unless there is some special circumstance that requires it. I do not personally rely on it. I commented out the export and the compiler seems to be finding all the headers it needs now.