MCore Options - Using the GNU Compiler Collection (GCC)

These are the ‘-m’ options defined for the Motorola M*Core processors.

-mhardlit
-mno-hardlit: Inline constants into the code stream if it can be done in two instructions or less.
-mdiv
-mno-div: Use the divide instruction. (Enabled by default).
-mrelax-immediate
-mno-relax-immediate: Allow arbitrary-sized immediates in bit operations.
-mwide-bitfields
-mno-wide-bitfields: Always treat bit-fields as int-sized.
-m4byte-functions
-mno-4byte-functions: Force all functions to be aligned to a 4-byte boundary.
-mcallgraph-data
-mno-callgraph-data: Emit callgraph information.
-mslow-bytes
-mno-slow-bytes: Prefer word access when reading byte quantities.
-mlittle-endian
-mbig-endian: Generate code for a little-endian target.
-m210
-m340: Generate code for the 210 processor.
-mno-lsim: Assume that runtime support has been provided and so omit the simulator library (libsim.a) from the linker command line.
-mstack-increment=size: Set 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.