Re: [RFC] [PATCH 0/9] Initial cross-compilation support

[Claudius Heine <ch@denx.de>]

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Hi Jan,

On Thu, 2018-06-14 at 14:30 +0200, Jan Kiszka wrote:
> On 2018-06-14 14:04, Claudius Heine wrote:
> > Hi,
> > 
> > On Wed, 2018-06-13 at 15:07 +0200, Alexander Smirnov wrote:
> > > Hi all,
> > > 
> > > this series introduces basic cross-compilation support for Isar.
> > > The
> > > implementation
> > > is based around new entity - buildchroot-cross, which is quite
> > > similar to original
> > > buildchroot, but has host architecture.
> > 
> > Here is a crazy idea from me and Henning:
> > Have you tried just installing an amd64-arm cross toolchain into
> > the
> > existing arm buildchroot, then switch to it from the 'native'
> > toolchain
> > using a combination of PATH variable entries, symlinks and/or
> > wrapper
> > scripts and let binfmt deal with calling the amd64 binaries of the
> > toolchain in the arm chroot environment?
> > 
> > This way the arm system would think that you are compiling nativly
> > while in fact you are using a cross compiler that is not emulated.
> > 
> > Would that work?
> 
> I just heard some story from SUSE folks doing something probably
> similar
> in the past, but they had to patch binfmt to inject the native tools
> into the chroot.
> 
> How would you ensure in your proposal that the native compiler finds
> its
> libraries?

I would try using the wrapper scripts. Setting all the paths to the
toolchain root directory and then calling gcc and friends with '
--sysroot /'.

I would have to try to find out if that works.

Cheers,
Claudius

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