Option
/CO[[DEVIEW]]
The /CO option adds line numbers and symbolic data to the executable file for use with the Microsoft CodeView debugger. The /CO option has no effect if the object files do not contain CodeView debugging information.
You can run the resulting executable file outside CodeView; the debugging data in the file is ignored. However, it increases file size and slows execution slightly. You should link a separate release version without the /CO option after the program has been debugged.
When /CO is used with the /TINY option, debug information is put in a separate file with the same base name as the .COM file and with the .DBG extension.
The /CO option is not compatible with the /EXEPACK option for DOS executable files.