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All floating-point arithmetic is done with calls to a floating-point
emulation library.  If a numeric data processor is present in the system, it
will be used by the library; otherwise floating-point operations are
simulated in software.  This option should be used for any of the following
reasons:
 1. Speed of floating-point emulation is favoured over code size.

 2. An application containing floating-point operations is to be stored in
    ROM and an 80x87 will not be present in the system.

The macro __SW_FPC will be predefined if "fpc" is selected.

+--------------------------------------------------------------------------+
|   Note:  When any module in an application is compiled with the "fpc"    |
| option, then all modules must be compiled with the "fpc" option.         |
  Different math libraries are provided for applications which have been   |
| compiled with a particular floating-point option.  See the section       |
| entitled Watcom C/C++ Math Libraries.                                    |
|                                                                          |
+--------------------------------------------------------------------------+
See the section entitled The NO87 Environment Variable for information on
testing the floating-point simulation code on personal computers equipped
with a coprocessor.