C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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D2020
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     Command-line error D2020
 
     'option' option requires extended keywords to be enabled (/Ze)
 
     The /Gc or /Gr option was specified on the same command line as
     the /Za option.
 
     The /Gc and /Gr options require the extended keyword __cdecl to be
     enabled. To enable __cdecl and make library functions accessible,
     use the default /Ze option instead of /Za.
 
     Check the CL environment variable for option specifications.
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