c++ - 警告 : resolving Func by linking to Func@##

Question

我正在构建一个包含以下内容的 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，我添加链接器选项:

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

输出是:

Warning: Resolving _DrawMouse by linking to _DrawMouse@24

为什么？为什么它警告我要解决，我怎样才能摆脱它？对于大量导出，我收到大量警告..

小例子:

主要.cpp:

#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;
}

测试.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消除这些警告以及导致它们的原因。

编辑:

按要求修复的命令行:

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 

还试过:

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 

都不行。

Answer 1

您需要向链接器提供 --enable-stdcall-fixup(它会自动修复问题)。当与 gcc 或 g++ 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.