How to determine default libraries for an .obj object file in Visual C++

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To see which libraries an object file will use by default, you can use the Dumpbin.exe utility in a console session. For example, to find out which libraries Mfcapp.obj will cause the linker to search automatically, you would use the following code (this example pipes the output to a file):

   DUMPBIN /RAWDATA /SECTION:.drectve MFCAPP.OBJ > OUTPUT.TXT
				

In the column to the right side of the output, you'll see the list of default libraries; the following is an excerpt from that column:

-default|lib:mfc4
0.lib -d|efaultli
b:mfcs40|.lib -de
faultlib|:msvcrt.
lib -def|aultlib:
kernel32|.lib -de
faultlib|:user32.
lib
				

From this excerpt, you can determine this object file will cause the linker to automatically search Mfc40.lib, Msvcrt.lib, Kernel32.lib, and User32.lib when building an executable file. As you can see, each library name is preceded with "-defaultlib:". You can use this procedure for multiple object files, and compare the output of each file.

One reason you may need to determine which default library names are in an object file is to troubleshoot the LNK2005 error, "symbol multiply defined."