RTEMS GNU Tools On-Line Library

M32R/D Options

Using and Porting the GNU Compiler Collection (GCC)

2.14.10: M32R/D Options

These `-m' options are defined for Mitsubishi M32R/D architectures:

-mcode-model=small: Assume all objects live in the lower 16MB of memory (so that their addresses can be loaded with the ld24 instruction), and assume all subroutines are reachable with the bl instruction. This is the default.
The addressability of a particular object can be set with the model attribute.
-mcode-model=medium: Assume objects may be anywhere in the 32 bit address space (the compiler will generate seth/add3 instructions to load their addresses), and assume all subroutines are reachable with the bl instruction.
-mcode-model=large: Assume objects may be anywhere in the 32 bit address space (the compiler will generate seth/add3 instructions to load their addresses), and assume subroutines may not be reachable with the bl instruction (the compiler will generate the much slower seth/add3/jl instruction sequence).
-msdata=none: Disable use of the small data area. Variables will be put into one of `.data', `bss', or `.rodata' (unless the section attribute has been specified). This is the default.
The small data area consists of sections `.sdata' and `.sbss'. Objects may be explicitly put in the small data area with the section attribute using one of these sections.
-msdata=sdata: Put small global and static data in the small data area, but do not generate special code to reference them.
-msdata=use: Put small global and static data in the small data area, and generate special instructions to reference them.
-G num: Put global and static objects less than or equal to num bytes into the small data or bss sections instead of the normal data or bss sections. The default value of num is 8. The `-msdata' option must be set to one of `sdata' or `use' for this option to have any effect.
All modules should be compiled with the same `-G num' value. Compiling with different values of num may or may not work; if it doesn't the linker will give an error message - incorrect code will not be generated.

Using and Porting the GNU Compiler Collection (GCC)