Re: Complining with codesurgery 4.4.-43 sh2a

[Fabio Giovagnini <fabio.giovagnini@aurion-tech.com>]

In fact I used the toolchain for building the binary file including the 
bootstrap code and the zImage of the kernel;and this told me the prolem 
beacuse in my own makefile I had -m2a only option set.

Do I have to skip the fpu when I'll build the usersapce application?


Thanks a lot Paul



In data venerdì 19 marzo 2010 12:27:35, Paul Mundt ha scritto:
: > On Fri, Mar 19, 2010 at 12:01:23PM +0100, Fabio Giovagnini wrote:
> > Hi all, why I need to compile my code with -m2a -m2a-nofpu aven if sh2a
> > 76203 has an fpu?
> > If I do not use -m2a-nofpu I have error
> >  undefined reference to `__fpscr_values'
> > at linking time
> 
> You should never be touching any of the Makefile build flags, they are
> delicate, have rigid ordering requirements, and are mapped out the way
> they are intentionally. Any time you are forced to hack up build flags
> you are almost guaranteed to be doing something wrong.
> 
> Whether the CPU has an FPU or not is completely irrelevant from the
> context of the kernel. The kernel does not have its own FP state, and so
> can't handle having FP instructions generated by the compiler, this is
> what the -nofpu inhibiting is for. Even in situations where the kernel
> may wish to hand craft FP context and open code a few instructions, the
> kernel is never built without -nofpu.
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-- 
Fabio Giovagnini

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