To correct the mistaken description how mspgcc's library works without
getting into details you don't want to know:
mspgcc does not have one variant per chip, but the libraries do have
variants across the axes that affect code generation: three meaningful CPU
architectures (two used for libraries), hardware multiplier support (five
variants, but only two affect libraries), and memory model which supports
four binary options (7 variants are built, but six only apply to CPUX).
Comes down to 16 total variants, supporting 434 distinct MCUs. Doesn't
take too long to build or too much space since msp430-libc isn't as large
as newlib.
Peter
On Mon, Sep 23, 2013 at 12:27 PM, DJ Delorie <d...@redhat.com> wrote:
>
> There are three multilibs that are built:
>
> 430 - the "default" so it doesn't have a subdir - is for all non-430X
> processors.
>
> 430x - for 430X series processors, but still using 16-bit pointers.
>
> 430x/large - for 430X series processors using 20-bit pointers.
>
>
> For each of those, newlib is built using a "common subset" so it works
> for any (I hope) processor in that category.
>
> GCC (msp430-elf-gcc, not mspgcc) has two options it looks at:
>
> -mmcu=<whatever> - if <whatever> has "430x" or "430X" in it, you get
> the 430x family. Default is the 430 family.
>
> -mlarge - enables 20-bit pointers.
>
> IIRC there's also -mcpu= which specifies the family (430/430x)
> directly, for when the MCU name doesn't match the pattern.
>
>
> Also, keep in mind that newlib is not targetted specifically to the
> 430's needs. It's a generic runtime library so tends to be more "one
> size fits all" than "one variant per chip" like mspgcc's library.
>
>
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