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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Compiler warning (levels 1, 2, and 4) C4001
 
     nonstandard extension 'extension' was used
 
     The given nonstandard language extension was used when the /Ze
     option was specified.
 
     In C, this is usually a level 4 warning, while in C++, this is
     always a level 2 warning. When compiling C with either the /f or
     /qc fast-compilation command-line options, a function pointer cast
     to a data type will produce a level 1 warning.
 
     If the /Za option has been specified, this condition generates a
     syntax error.
                                    -♦-