[PATCH] Basic support for MIPS r5900

["Jürgen Urban"]

Hello Richard,

> >> Does it still work with those changes, as below?  If so, I'll check it in.
> >
> > I tested it. It is still working. So the patch is OK, please check it in.
>
> OK, I've applied this and the config.gcc patch.

Thanks.

In the native PS2SDK (i.e. no Linux) I detected that there are undefined references to `__fixtfsi', `__floatsitf', `__subtf3', `__multf3', `__extenddftf2', `__lttf2' and `__gttf2'. These are the functions for handling "long double".
There is a fix needed for this in libgcc. I attached 2 patches to this e-mail. There should be only one of the patches used to fix this.
The first one fixes the problem for all mips systems. The second one fixes this only for r5900. I think it is a general problem. I assume the undefined references could appear on all mips64 systems which are not Linux. So the first patch should be applied.
Checking for "ac_cv_sizeof_long_double" should work on all mips systems, but I don't know why the check was only in the mips*-linux part of the file libgcc/config.host.

Best regards
Jürgen
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