警告:通过链接到Func @ ##来解析Func

时间:2013-06-04 07:14:08

标签: c++

我正在使用以下内容构建DLL:

extern "C" __declspec(dllexport) void __stdcall DrawMouse(int X, int Y, int R, int G, int B)
{
    Buffer.SetMouse(X, Y, R, G, B);
}

然后在.def文件中我添加了:

LIBRARY Test
;DESCRIPTION "Test Definition File"
EXPORTS

DrawMouse;

然后当我编译时,我添加了链接器选项:

-static
-static-libstdc++
-static-libgcc
-Wl,--kill-at -d --input-def src\Test.def
-m32

输出是:

  

警告:通过链接到_DrawMouse @ 24

来解析_DrawMouse

为什么呢?为什么它会警告我解决问题,如何摆脱它?对于大量的出口,我收到了大量的警告..

小例子:

Main.cpp的:

#include <windows.h>

class Input
{
    public:
        void SetMouse(int X, int Y, int R, int G, int B)
        {
            /**Dummy Example**/
        }
};



Input Buffer;
extern "C" void __stdcall SetMouse2(int X, int Y, int R, int G, int B)
{
    /**Dummy Non-Class Example**/
}

extern "C" __declspec(dllexport) void __stdcall DrawMouse(int X, int Y, int R, int G, int B)
{
    Buffer.SetMouse(X, Y, R, G, B);
}

extern "C" __declspec(dllexport) void __stdcall DrawMouse2(int X, int Y, int R, int G, int B)
{
    SetMouse2(X, Y, R, G, B);
}

extern "C" __declspec(dllexport) bool __stdcall DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
    switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
            DrawMouse(100, 100, 1, 1, 1);
            DrawMouse2(100, 100, 1, 1, 1);
            break;

        case DLL_PROCESS_DETACH:
            break;
    }
    return true;
}

Test.def:

LIBRARY Test
;DESCRIPTION "Test Definition File"
EXPORTS

DrawMouse;
DrawMouse2;

编译器日志:

-------------- Clean: Release in Test (compiler: GNU GCC Compiler)---------------

Cleaned "Test - Release"

-------------- Build: Release in Test (compiler: GNU GCC Compiler)---------------

x86_64-w64-mingw32-g++.exe  -O2  -Wall -m32 -DBUILD_DLL  -std=c++11    -c C:\Users\Brandon\Desktop\Test\main.cpp -o obj\Release\main.o

x86_64-w64-mingw32-g++.exe -shared -Wl,--output-def=bin\Release\libTest.def -Wl,--out-implib=bin\Release\libTest.a -Wl,--dll  obj\Release\main.o   -o bin\Release\Test.dll -s -static -static-libstdc++ -static-libgcc -Wl,--kill-at -d --input-def Test.def -m32  -luser32 

Warning: resolving _DrawMouse by linking to _DrawMouse@20
Warning: resolving _DrawMouse2 by linking to _DrawMouse2@20
Use --enable-stdcall-fixup to disable these warnings
Use --disable-stdcall-fixup to disable these fixups

Output size is 32.50 KB
Process terminated with status 0 (0 minutes, 0 seconds)
0 errors, 2 warnings (0 minutes, 0 seconds)

注意: - disable-stdcall-fixup不起作用。这就是为什么我要问如何解决这个问题并摆脱这些警告以及导致它们的原因。

编辑:

带有所需修正的命令行:

x86_64-w64-mingw32-g++.exe  -O2  -Wall -m32 -DBUILD_DLL  -std=c++11    -c C:\Users\Brandon\Desktop\Test\main.cpp -o obj\Release\main.o

x86_64-w64-mingw32-g++.exe -shared -Wl,--output-def=bin\Release\libTest.def -Wl,--out-implib=bin\Release\libTest.a -Wl,--dll  obj\Release\main.o   -o bin\Release\Test.dll -s -static -static-libstdc++ -static-libgcc -Wl,--kill-at -d --input-def Test.def -m32 --disable-stdcall-fixup  -luser32 

也尝试过:

x86_64-w64-mingw32-g++.exe  -O2  -Wall -m32 -DBUILD_DLL  -std=c++11    -c C:\Users\Brandon\Desktop\Test\main.cpp -o obj\Release\main.o

x86_64-w64-mingw32-g++.exe -shared -Wl,--output-def=bin\Release\libTest.def -Wl,--out-implib=bin\Release\libTest.a -Wl,--dll  obj\Release\main.o   -o bin\Release\Test.dll -s -static -static-libstdc++ -static-libgcc -Wl,--kill-at -d --input-def Test.def -m32 --enable-stdcall-fixup  -luser32 

都没有效果。

1 个答案:

答案 0 :(得分:4)

您需要向链接器提供--enable-stdcall-fixup(它会自动修复问题)。与gccg++一起使用时,这意味着-Wl,--enable-stdcall-fixup

有关这些选项的详细信息,请查看Gnu Linker options的第2.1.1节。