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To: gentoo-embedded@g.o
From: Jason <gentoo@...>
Subject: Re: multi-project workflow
Date: Mon, 23 Jan 2012 11:52:07 -0500
Hi Sergey,

On Mon, Jan 23, 2012 at 11:35:46AM +0400, Sergey Mironov wrote:
> Hi. Model
> 
> > /usr/
> >  arm-none-linux-gnueabi/ -> projectA/
> >  arm-none-linux-gnueabi.orig/
> >  projectA/
> >  projectB/
> >  ...
> >  projectN/
> >
> > with arm-none-linux-gnueabi.orig/ being the original contents after
> > crossdev built the toolchain.  As I create projects, I would 'cp -a
> > arm....orig/* projectN/'
> >
> 
> there is one drawback here - compiler version. Looks like gentoo
> stores libc files in /usr/lib/gcc/arm-projectA-linux-gnueabi/1.2.3
> so it will probably break something if you use different gcc for your projects.

Yes, I remember falling into that trap before, with libgcc.a, etc.  The
above layout assumed a single, static cross-compiler.  Updates to the
cross-compiler would then necessitate rebuilding all the projects.

> > How do folks out there handle multiple projects with the same toolchain?
> > I'm thinking, since crossdev worked so well, to just build a
> > 'arm-projectA-linux-gnueabi' and then 'arm-projectB-linux-gnueabi' to
> > keep the roots separate.
> > What do you guys use?
> 
> I use 'arm-projectA-linux-gnueabi' approach. It works, but still not
> ideal - For example, I can't just copy the whole folder to another
> gentoo machine and continue use emerge-projectA there.

I don't anticipate much need to migrate /usr/cross-compiler to other
machines.  As long as I keep the ebuilds for the cross-compiler
components, crossdev, and the packages, I should be able to rebuild any
given project from scratch.

I should probably set up a separate overlay per project to accomplish
that.

thx,

Jason.


References:
multi-project workflow
-- Jason
Re: multi-project workflow
-- Sergey Mironov
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Updated Jun 25, 2012

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