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Linker Tools Warning LNK4098

defaultlib 'library' conflicts with use of other libs; use /NODEFAULTLIB:library

You are trying to link with incompatible libraries.

NoteNote

The run-time libraries now contain directives to prevent mixing different types. You will receive this warning if you try to use different types or debug and non-debug versions of the run-time library in the same program. For example, if you compiled one file to use one kind of run-time library and another file to use another kind (for example, single-threaded versus multithreaded) and tried to link them, you will get this warning. You should compile all source files to use the same run-time library. See the Use Run-Time Library (/MD, /MT, /LD) compiler options for more information.

You can use the linker's /VERBOSE:LIB switch to determine which libraries the linker is searching. If you receive LNK4098 and want to create an executable file that uses, for example, the single-threaded, non-debug run-time libraries, use the /VERBOSE:LIB option to find out which libraries the linker is searching. The linker should print LIBC.lib and not LIBCMT.lib, MSVCRT.lib, LIBCD.lib, LIBCMTD.lib, or MSVCRTD.lib as the libraries searched. You can tell the linker to ignore the incorrect run-time libraries by using /NODEFAULTLIB for each library you want to ignore.

The table below shows which libraries should be ignored depending on which run-time library you want to use.

To use this run-time library

Ignore these libraries

Single-threaded (libc.lib)

libcmt.lib, msvcrt.lib, libcd.lib, libcmtd.lib, msvcrtd.lib

Multithreaded (libcmt.lib)

libc.lib, msvcrt.lib, libcd.lib, libcmtd.lib, msvcrtd.lib

Multithreaded using DLL (msvcrt.lib)

libc.lib, libcmt.lib, libcd.lib, libcmtd.lib, msvcrtd.lib

Debug Single-threaded (libcd.lib)

libc.lib, libcmt.lib, msvcrt.lib, libcmtd.lib, msvcrtd.lib

Debug Multithreaded (libcmtd.lib)

libc.lib, libcmt.lib, msvcrt.lib, libcd.lib, msvcrtd.lib

Debug Multithreaded using DLL (msvcrtd.lib)

libc.lib, libcmt.lib, msvcrt.lib, libcd.lib, libcmtd.lib

For example, if you received this warning and you want to create an executable file that uses the non-debug, single-threaded version of the run-time libraries, you could use the following options with the linker:

/NODEFAULTLIB:libcmt.lib /NODEFAULTLIB:msvcrt.lib /NODEFAULTLIB:libcd.lib /NODEFAULTLIB:libcmtd.lib /NODEFAULTLIB:msvcrtd.lib

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