Re: [PATCH] Add basic m68k support to crosstool-ng

[Remy Bohmer <linux at bohmer dot net>]

Hi,

2010/1/28 Yann E. MORIN <yann.morin.1998@anciens.enib.fr>:
> Hello Remy, All!
>
> Whaoo! Very nice! Thank you for the submission! :-)
>
> I have however a few questions, see below...
>
> On Thursday 28 January 2010 19:57:14 Remy Bohmer wrote:
>> +config ARCH_m68k
>> + ? ?select ARCH_SUPPORTS_32
>> + ? ?select ARCH_DEFAULT_32
>> + ? ?select ARCH_DEFAULT_BE
>> + ? ?select ARCH_SUPPORT_CPU
>
> From the gcc man page, it seems you can also pass -march and -mtune.
> Did you exclude those on purpose, or is it a oversight?

Looking deeper into this it seems that:
* if GCC is compiled with --with-arch=m68k (ARCH_ARCH=m68k) then the
build of newlib eventually fails because its compilation passes
-march=m68k to GCC, which is an illegal value for GCC itself.
* If GCC is compiled with 'ARCH_ARCH=cpu32', which is valid for -march
for GCC as listed on the man-pages, then the compilation of GCC fails
since it does not like this option to be passed through --with-arch.
* --with-tune is not supported either, although --with-cpu works properly.

Any ideas?

Kind regards,

Remy

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