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Line number debugging information is included in the object file.  This
option provides additional information to the Watcom Debugger (at the
expense of larger object files and executable files).  Line numbers are
handy when debugging your application with the Watcom Debugger at the source
code level.  Code speed is not affected by this option.  To avoid
recompiling, the Watcom Strip Utility can be used to remove debugging
information from the executable image.