C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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D4021
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     Command-line warning D4021
 
     no action performed
 
     A contradictory set of filenames and switches caused the compiler
     to perform no operation.
 
     This warning can be generated by giving the /c compile-only
     command-line option and specifying no .C, .CPP, or .CXX files to
     compile.
                                    -♦-