Dear Jean-Christophe PLAGNIOL-VILLARD,
In message <20090712161700.gd21...@game.jcrosoft.org> you wrote:
>
> > Right. And each of these is supposed to come with it's own version of
> > libgcc, configured exactly for the requirements of this specific
> > version and configuration of GCC.
> the problem is that it's not really possible on arm
> because you will need a toolchain for u-boot and an other for the userland
> and in somecase an other for the kernel
You mean it is impossible to build a tool chain for ARM that can be
used to build U-Boot, Linux, and user space code? I can't believe
that ARM support in GCC is that seriously broken.
> We can not trust at all the libgcc provide by the toolchains we have see this
> kind of problem thousand of times on the kernel and of course in U-Boot
> and it's not the only arch to have this kind of problem the mips have too.
What do you mean? Are there examples where the libgcc provided
functions are incorrect? But then - isn't the Linux kernel code
drived from the very same set of sources?
The only problems that I have seen in the past is that for example
libgcc code assumes hardware FP support (ironically even on
processors that never had a FPU) while U-Boot uses "-msoft-float". In
that case it would be sufficient if the GCC builders provided a
version of libgcc configured for soft-float.
Are you aware of problems that have a different nature, i. e. where
the libgcc provided source code is actually incorrect for some
system?
> I can give 10's of toolchains which are correctly configured but never acheive
> to build u-boot or the kernel just because of the libgcc.
The questionhere is probably how you define "correctly". If these tool
chains are supposed to be used for U-Boot and kenrel development, then
they are probably at least not complete.
> Btw it will not be a huge work for U-Boot at all as we do this job in the
> kernel anyway
You still have to keep both in sync.
And as I mantioned before: I do not oppose the change itself. I agree
that it is useful and actually a very good idea to support users who
really need this. The only things I oppose are (1) making this the
default (or even mandatory) for all tool chains and (2) making it
architecture-dependent.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
In the beginning, there was nothing, which exploded.
- Terry Pratchett, _Lords and Ladies_
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