3.6.1 Options Specific to AVR Devices

The options listed below are useful when compiling 8-bit Microchip AVR devices with the MPLAB XC8 compiler and are discussed in following sections.

Table 3-4. AVR Device-Specific Options
Option (links to explanatory section)	Controls
`-m[no-]accumulate-args`	How arguments are passed between functions.
`-m[no-]call-prologues`	How functions save and restore registers.
`-m[no-]const-data-in-config-mapped-progmem`	Whether the compiler will place `const`-qualified data into a 32k flash section that is then mapped into data memory.
`-m[no-]const-data-in-progmem`	Whether `const`-qualified objects are placed in program or data memory.
`-mcpu=device`	The target device or architecture to compile.
`-m[no-]diva`	Whether the DIVA module is utilized for some integer operations.
`-mdfp=path`	The source of device-specific information.
`-mfuse-action`	Adjust code memory size, based on configuration fuses values.
`-mno-interrupts`	How the stack pointer is changed.
`-f[no-]jump-tables`	Whether jump tables are used in `switch()` statements.
`-m[no-]relax`	Optimization of call/jump instructions.
`-mreserve=space@start:end`	The address ranges in the memory space to be reserved.
`-mshort-calls`	How function calls are encoded.
`-msmart-io=level`	The feature set of the IO library linked in.
`-msmart-io-format="format"`	Manual inclusion of IO library features.
`-m[no-]strict-X`	The use of the X register.
`-m[no-]tiny-stack`	The width of the stack pointer.