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In addition to line number information, local symbol and data type
information is included in the object file.  Although global symbol
information can be made available to the Watcom Debugger through a Watcom
Linker option, local symbol and typing information must be requested when
the source file is compiled.  This option provides additional information to
the Watcom Debugger (at the expense of larger object files and executable
files).
By default, the compiler will select the "od" level of optimization if "d2"
is specified (see the description of the "od" option).  Starting with
version 11, the compiler now expands functions in-line where appropriate.
 This means that symbolic information for the in-lined function will not be
available.

The use of this option will make the debugging chore somewhat easier at the
expense of code speed and size.  To create production code, you should
recompile without this option.