Select the CPU for which code is generated. name may be one of
‘r8c’ for the R8C/Tiny series, ‘m16c’ for the M16C (up to
/60) series, ‘m32cm’ for the M16C/80 series, or ‘m32c’ for
the M32C/80 series.
Specifies that the program will be run on the simulator. This causes
an alternate runtime library to be linked in which supports, for
example, file I/O. You must not use this option when generating
programs that will run on real hardware; you must provide your own
runtime library for whatever I/O functions are needed.
Specifies the number of memory-based pseudo-registers GCC will use
during code generation. These pseudo-registers will be used like real
registers, so there is a tradeoff between GCC's ability to fit the
code into available registers, and the performance penalty of using
memory instead of registers. Note that all modules in a program must
be compiled with the same value for this option. Because of that, you
must not use this option with the default runtime libraries gcc