Re: Hi Andrew

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

You undestood exactly!!!
Your answer make very clear all the aspects of the problem

Thanks a lot



In data mercoledì 14 aprile 2010 09:30:51, Andrew Stubbs ha scritto:
: > On 14/04/10 08:08, Fabio Giovagnini wrote:
> > Ok. so the Makefile for zImage needs to be modified to use the libc
> > functions embedded into the kernel source tree. Is it right?
> > If yes, how is it possible to have a general coccect behaviour?
> 
> I'm sorry, I'm not sure I understand the question.
> 
> Yes, the makefile needs to be modified to remove the dependency on
> libgcc. This was done for the kernel itself a few versions ago. It means
> that the toolchain does not need any special configuration to build the
> kernel, in cases like this where the usermode compiler is incompatible
> with the kernel.
> 
> If you're asking how to do the modification, I don't know. I'm not a
> kernel hacker.
> 
> If you're asking how any hypothetical project should handle this, then
> the answer is that they should rely on the toolchain, and not have to
> worry about it. The kernel is special - it is traditionally compiled
> with a toolchain unsuitable for building bare-metal programs. It is
> desirable that the same compiler is used for user mode, and for the
> kernel, because having a whole separate toolchain would be a lot of
> wasted effort, but it means that the kernel makefiles have to work hard
> to reconfigure the tools using custom parameters, linker scripts and
> overriding compiler built-ins.
> 
> Is that the answer to the question you were asking?
> 
> Andrew
> 

-- 
Fabio Giovagnini

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