(Command-line option to suppress warning: -w-com) 

This warning message is issued when a C++ // comment is continued onto the next line with backslash line continuation.  

The intention is to warn about cases where lines containing source code unintentionally become part of a comment because that comment happened to end in a backslash.  

If you get this warning, check carefully whether you intend the line after the // comment to be part of the comment. If you don't, either remove the backslash or put some other character after it. If you do, it's probably better coding style to start the next comment line with // also.  

The warning can be disabled altogether with #pragma warn -com.