CODEWITHSUNDEEP
visual-studiofunctionassemblylinkermasm
Antiusninja
Antiusninja

Reputation: 167

Linking assembly function .asm to c++ project in Visual Studio 2012

I've created in windows c++ project in Visual Studio to learn how to write asm functions. So in my project I've got hello.asm with this simple code:

.686
.MODEL FLAT
.STACK
.DATA 
.CODE

hello PROC
xor eax,eax
ret 
hello ENDP

END

and asm_test.cpp with main function like this:

#include "stdafx.h"
#include <Windows.h>
extern "C" void hello();

int _tmain(int argc, _TCHAR* argv[])
{
    hello();
    return 0;
}

So in general ml.exe doesnt have any problem compiling asm file to hello.obj but hello() function doesnt' know where should it be taken from. And here is what compiler tells me.

1>------ Построение начато: проект: asm_test, Конфигурация: Debug Win32 ------
1>  Assembling hello.asm...
1>asm_test.obj : error LNK2019: ссылка на неразрешенный внешний символ _hello в функции _wmain
1>G:\renderer\asm_test\Debug\asm_test.exe : fatal error LNK1120: неразрешенных внешних элементов: 1
========== Построение: успешно: 0, с ошибками: 1, без изменений: 0, пропущено: 0 ==========

Sorry, it's on russion, but it's clear that it can not find hello function

Upvotes: 0

Views: 2686

Answers (1)

Peixu Zhu
Peixu Zhu

Reputation: 2151

change hello to be _hello plz. for your hello.asm, it should be:

.686
.MODEL FLAT
.STACK
.DATA 
.CODE

_hello PROC
xor eax,eax
ret 
_hello ENDP

END

Upvotes: 1

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