These -m options are defined for Matsushita MN10300 architectures:
-mmult-bug ¶Generate code to avoid bugs in the multiply instructions for the MN10300 processors. This is the default.
-mno-mult-bug ¶Do not generate code to avoid bugs in the multiply instructions for the MN10300 processors.
-mam33 ¶Generate code using features specific to the AM33 processor.
-mno-am33 ¶Do not generate code using features specific to the AM33 processor. This is the default.
-mam33-2 ¶Generate code using features specific to the AM33/2.0 processor.
-mam34 ¶Generate code using features specific to the AM34 processor.
-mtune=cpu-type ¶Use the timing characteristics of the indicated CPU type when scheduling instructions. This does not change the targeted processor type. The CPU type must be one of ‘mn10300’, ‘am33’, ‘am33-2’ or ‘am34’.
-mreturn-pointer-on-d0 ¶When generating a function that returns a pointer, return the pointer
in both a0 and d0. Otherwise, the pointer is returned
only in a0, and attempts to call such functions without a prototype
result in errors. Note that this option is on by default; use
-mno-return-pointer-on-d0 to disable it.
-mno-crt0 ¶Do not link in the C run-time initialization object file.
-mrelax ¶Indicate to the linker that it should perform a relaxation optimization pass to shorten branches, calls and absolute memory addresses. This option only has an effect when used on the command line for the final link step.
This option makes symbolic debugging impossible.
-mliw ¶Allow the compiler to generate Long Instruction Word
instructions if the target is the ‘AM33’ or later. This is the
default. This option defines the preprocessor macro __LIW__.
-mnoliw ¶Do not allow the compiler to generate Long Instruction Word
instructions. This option defines the preprocessor macro
__NO_LIW__.
-msetlb ¶Allow the compiler to generate the SETLB and Lcc
instructions if the target is the ‘AM33’ or later. This is the
default. This option defines the preprocessor macro __SETLB__.
-mnosetlb ¶Do not allow the compiler to generate SETLB or Lcc
instructions. This option defines the preprocessor macro
__NO_SETLB__.