LNK1112 module machine type 'X86' conflicts with target machine type 'x64' (VC++ 2005)

Question

I am trying to build a blank, 64-bit C++ application in Visual Studio 2005 Professional using these steps:

1. Create a new Win32 Console Application project
2. Go to Configuration Manager, create new Solution Platform of type x64, copy settings from Win32
3. Save & build

However, I get this error:

LINK : fatal error LNK1104: cannot open file 'kernel32.lib'

So, I tried updating the library directories to point to kernel32.lib:

1. Go to Project Properties, Linker, General, Additional Library Directories and set "C:\Program Files\Microsoft Visual Studio 8\VC\lib\amd64"
2. Save & build

This gives me the error:

LINK : fatal error LNK1104: cannot open file 'user32.lib'

So, I tried updating the library directories to point to user32.lib:

1. Go to Project Properties, Linker, General, Additional Library Directories and add "C:\Program Files\Microsoft SDKs\Windows\v7.1\Lib\x64"
2. Save & build

But now I am getting the error:

.\x64\debug\stdafx.obj : fatal error LNK1112: module machine type 'X86' conflicts with target machine type 'x64'

Any ideas what I am doing wrong?

Answer 1

Must've been a broken installation of Visual Studio. A new installation of Windows and VS2005 fixed the problem.

Answer 2

It sounds like the problem is with the object file stdafx.obj rather than the system libraries. The warning is saying that stdafx.obj is 32-bit so it can't link into a 64-bit target. Things to try:

• Delete the build directories x64 and win32
• Rebuild the project
• Check the build settings for stdafx.cpp to ensure it's building as 64-bit

Answer 3

Its been long since the question was asked, but for the benefit of others who happen to read this, the change required is in the linker flag setting. Change /machine:I386 to /machine:x64