[Buildroot] building native gcc for target

[Baruch Siach]

Hi Kevin,

On Wed, Aug 08, 2012 at 01:24:14PM -0700, Kevin Broch wrote:
> Thank Baruch I will have to check it out.  Have you used this yourself and
> if so what platform?

Yes. I used it on ARMv5 platform (i.MX25) to build the initramfs environment 
(just Busybox and a few small utilities) statically linked.

Another option that comes to mind is to install Debian on your target. Debian 
includes a natively built toolchain, and you can easily test the result in a 
chroot. If you don't have enough storage for Debian (at least 500MB, more is 
preferred) on-board you can use NFS mounted root filesystem, mounted from a 
PC. I used this trick on several platforms (ARM, MIPS, PowerPC) during 
bring-up phase as it's a short path to a wealth of pre-built (and natively 
compiled) software packages.

baruch

> On Tue, Aug 7, 2012 at 10:57 PM, Baruch Siach <baruch at tkos.co.il> wrote:
> > Hi Scott, Kevin,
> >
> > On Tue, Aug 07, 2012 at 07:27:33PM -0700, Scott Moore wrote:
> > > On 8/7/12 7:19 PM, Steve Calfee wrote:
> > > >On Tue, Aug 7, 2012 at 6:18 PM, Kevin Broch <kevbroch at gmail.com> wrote:
> > > >>I'm am looking to build a complete (gcc too) development environment
> > on the
> > > >>target (arm) but currently don't see that this is possible.
> > > >>I have tried all 3 toolchain types (buildroot, cross-ng, external
> > (linaro),
> > > >>but regardless I don't find gcc in output/target/usr/bin/gcc
> > > >>I am wondering if I am missing something?
> > > >>
> > > >>If not I am looking for any pointer on how I might do this (having
> > never
> > > >>created a buildroot package).
> > > >>Ideally I would like to create a package that compiles Linaro GCC:
> > > >>https://wiki.linaro.org/WorkingGroups/ToolChain/Using/GCCNative
> > > >>I am imagining leveraging what is used to generate other tools like
> > gdb,
> > > >>binutils, and trying to incorporate the various machine options (VFP,
> > > >>softfloat, etc)
> > > >>in the configure options.
> > > >>
> > > >>Any pointers would be appreciated.
> > > >I guess you haven't seen how to do it because it is kind of bizarre.
> > > >You want to cross compile a native mode compiler. Why?
> > > >
> > > >Most people building embedded systems don't want to compile on those
> > > >systems. I don't know how you even bootstrap a gcc build in a system
> > > >without a c compiler.
> > > According to http://www.uclibc.org/toolchains.html (which
> > > unfortunately seems quite out of date), this is a recommended way of
> > > creating a development system for using uClibc.
> > > I'm actually trying to do something similar to easily build
> > > applications in a "clean" environment with only uClibc headers, etc,
> > > and also having trouble. Has anyone done this recently? (See my
> > > message earlier today about a configuration for x86_64)
> > >
> > > Kevin, you may need to select GCC in the "package selection for
> > > target -> development tools" options in menuconfig (which requires
> > > setting development files on target to true in build options). I've
> > > gotten that far but the resulting native compiler hasn't worked
> > > reliably.
> >
> > You may try Aboriginal Linux (http://landley.net/aboriginal/) which
> > includes
> > pre-built native compilers for various targets, along with their build
> > scripts.
> >
> > baruch

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