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These are the ‘-m’ options defined for the Motorola M*Core processors.
-mhardlit-mno-hardlitInline constants into the code stream if it can be done in two instructions or less.
-mdiv-mno-divUse the divide instruction. (Enabled by default).
-mrelax-immediate-mno-relax-immediateAllow arbitrary-sized immediates in bit operations.
-mwide-bitfields-mno-wide-bitfieldsAlways treat bit-fields as int-sized.
-m4byte-functions-mno-4byte-functionsForce all functions to be aligned to a 4-byte boundary.
-mcallgraph-data-mno-callgraph-dataEmit callgraph information.
-mslow-bytes-mno-slow-bytesPrefer word access when reading byte quantities.
-mlittle-endian-mbig-endianGenerate code for a little-endian target.
-m210-m340Generate code for the 210 processor.
-mno-lsimAssume that runtime support has been provided and so omit the simulator library (libsim.a) from the linker command line.
-mstack-increment=sizeSet the maximum amount for a single stack increment operation. Large values can increase the speed of programs that contain functions that need a large amount of stack space, but they can also trigger a segmentation fault if the stack is extended too much. The default value is 0x1000.