X-Hacker.org- Watcom C/C++ User's Guide - this option may be used to disable the optimization where a "call" followed

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This option may be used to disable the optimization where a "CALL" followed
by a "RET" (return) is changed into a "JMP" (jump) instruction.
(16-bit only) This option is required if you wish to link an overlayed
program using the Microsoft DOS Overlay Linker.  The Microsoft DOS Overlay
Linker will create overlay calls for a "CALL" instruction only.  This option
is not required when using the Watcom Linker.

The macro __SW_OC will be predefined if "oc" is selected.

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