Re: about RTEMS toolchain target mips32 little endian

[Ralf Corsepius <ralf dot corsepius at rtems dot org>]

On 01/04/2013 09:29 AM, Devin wrote:
> I am working on Mips32-based processors.little endian model.

No idea, why you are posting here and don't post this question to one of 
the rtems lists.

> According to the document which RTEMS suggest,I has built toolchain
> (mips-rtems4.10-gcc).but when I compile csb350 bsp by adding parameter "-EL"
> &"-mips32"in csb350.bfg .
>   Some *error*s occur .
> error:
>
> //mips-rtems4.10/lib/crt0.o: compiled for a big endian system and target is
> little endian
> /opt/rtems/lib/gcc/mips-rtems4.10/4.4.6/../../../../mips-rtems4.10/bin/ld:
> /opt/rtems/lib/gcc/mips-rtems4.10/4.4.6/../../../../mips-rtems4.10/lib/crt0.o:
> endianness incompatible with that of the selected emulation/
>
> So, I want to build toolchain which can support  adding "-mips32"&"-EL"in
> the same time.
> Today , I find one file  named "t-rtems" in gcc source
> "/gcc-4.4.6/gcc/config/mips/"
>
> The following is the content of the "t-rtems" :
>
> *# Custom multilibs for RTEMS
>
> # default is mips1 EB hard-float
> MULTILIB_OPTIONS = mips1/mips3/mips32 EB/EL msoft-float
> MULTILIB_DIRNAMES = mips1 mips3 mips32 eb el soft-float
> MULTILIB_MATCHES = EL=mel EB=meb
>
> MULTILIB_EXCEPTIONS =
>
> # Big endian only
> MULTILIB_EXCEPTIONS += EL*
> MULTILIB_EXCEPTIONS += mips32/EL*
>
> MULTILIB_EXCEPTIONS += EL*
> MULTILIB_EXCEPTIONS += mips3/EL*
>
> # Little endian only
> MULTILIB_EXCEPTIONS += mips3
> MULTILIB_EXCEPTIONS += mips3/msoft-float*
>
> Now, I think I should chang the deault setting .
> How can I do to gcc make sure  the  default target will be  mips32 EL
> soft-float ??
You don't really want to odo this - Instead, you will likely want to 
_add_ a mips32/EL multilib variant.

I.e you want to extend/modify t-rtems in a way a mips32/EL multilib 
variant is being built.

Without having tried it, my gut feeling is all you'd have to do to 
achieve this is to remove the
MULTILIB_EXCEPTIONS += mips32/EL*
line from t-rtems.


Ralf








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