I'm integrating 3rd party code into my MFC app under Visual Studio 2010.
When in Debug mode the following build error occurs:
1>LIBCMT.lib(invarg.obj) : error LNK2005: __initp_misc_invarg already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: __call_reportfault already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: __set_invalid_parameter_handler already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: __get_invalid_parameter_handler already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: __invoke_watson already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: "void __cdecl _invoke_watson(unsigned short const *,unsigned short const *,unsigned short const *,unsigned int,unsigned int)" (?_invoke_watson@@YAXPBG00II@Z) already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: __invalid_parameter already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: "void __cdecl _invalid_parameter(unsigned short const *,unsigned short const *,unsigned short const *,unsigned int,unsigned int)" (?_invalid_parameter@@YAXPBG00II@Z) already defined in libcmtd.lib(invarg.obj)
1>LIBCMT.lib(invarg.obj) : error LNK2005: ___pInvalidArgHandler already defined in libcmtd.lib(invarg.obj)
1>LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library
1>D:\My Documents\Dev\MyProject\MyProject\Debug\MyProject.exe : fatal error LNK1169: one or more multiply defined symbols found
Using this advice I was able to complete the build in two ways:
- In Release mode
- In Debug mode using /FORCE:MULTIPLE as an additional linker command line option
In the second case (Debug mode) many warnings are still reported. If I also add /NODEFAULTLIB:LIBCMT most of them are gone.
What is the cause of this?
How can I solve this, instead of working around it?
For some reason, you're linking against both LIBCMT and LIBCMTD (the debug version). (From reading the end of each error line: already defined in libcmtd.lib(invarg.obj))
You're fixing the right thing by saying /NODEFAULTLIB:LIBCMT. Does the debug/release flag on the third-party library that you're linking against match the debug/release mode on your app build? I would guess that the third-party code is pulling in a redundant library somehow.
If you're lucky, your 3rd party package contains a xxx.lib as well as a xxxD.lib, like for LIBCMT. Then you would just have to link the appropriate one according to release/debug. Worked for me in a similar case.
I resolved the same problem this way: In the Solution Explorer > Configuration Parameters > C/C++ > Code Generation. In the Runtime Library field, select.... for my "3rd party code" I had to select Multi-threaded (/MTd) and it worked.
来源：https://stackoverflow.com/questions/3885548/visual-studio-error-lnk2005-in-debug-mode