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These ‘-m’ options are defined for the VMS implementations:
-mvms-return-codes ¶Return VMS condition codes frommain. The default is to return POSIX-stylecondition (e.g. error) codes.
-mdebug-main=prefix ¶Flag the first routine whose name starts withprefix as the mainroutine for the debugger.
-mmalloc64 ¶Default to 64-bit memory allocation routines.
-mpointer-size=size ¶Set the default size of pointers. Possible options forsize are‘32’ or ‘short’ for 32 bit pointers, ‘64’ or ‘long’for 64 bit pointers, and ‘no’ for supporting only 32 bit pointers.The later option disablespragma pointer_size.