info gcc

3.17.16 M68hc1x Options

These are the ‘-m’ options defined for the 68hc11 and 68hc12 microcontrollers. The default values for these options depends on which style of microcontroller was selected when the compiler was configured; the defaults for the most common choices are given below.

@gcctabopt -m6811
@gcctabopt -m68hc11: Generate output for a 68HC11. This is the default when the compiler is configured for 68HC11-based systems.
@gcctabopt -m6812
@gcctabopt -m68hc12: Generate output for a 68HC12. This is the default when the compiler is configured for 68HC12-based systems.
@gcctabopt -m68S12
@gcctabopt -m68hcs12: Generate output for a 68HCS12.
@gcctabopt -mauto-incdec: Enable the use of 68HC12 pre and post auto-increment and auto-decrement addressing modes.
@gcctabopt -minmax
@gcctabopt -nominmax: Enable the use of 68HC12 min and max instructions.
@gcctabopt -mlong-calls
@gcctabopt -mno-long-calls: Treat all calls as being far away (near). If calls are assumed to be far away, the compiler will use the call instruction to call a function and the rtc instruction for returning.
@gcctabopt -mshort: Consider type int to be 16 bits wide, like short int.
@gcctabopt -msoft-reg-count=count: Specify the number of pseudo-soft registers which are used for the code generation. The maximum number is 32. Using more pseudo-soft register may or may not result in better code depending on the program. The default is 4 for 68HC11 and 2 for 68HC12.