[Buildroot] Can I use the toolchain build with buildroot, as an external toolchain ?
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Thu Mar 22 16:55:30 UTC 2012
Hello,
Le Thu, 22 Mar 2012 16:49:31 +0000 (UTC),
Grant Edwards <grant.b.edwards at gmail.com> a écrit :
> > Q: Can I use a toolchain that has been build with buildroot (before)
> > as an external toolchain ?
>
> Yes. I used to do that. After a few weeks, I gave up on it and built
> an external toolchain using crosstool-ng.
>
> > Q: Is this explained somewhere, on how to do this?
>
> No, because it's much simpler to just build an external toolchain
> using crosstool-ng, and then configure Buildroot use that.
Yes, I agree.
If you want to do that anyway, here are the steps. From a pristine
Buildroot configuration:
* Select your architecture
* Select your architecture variant
* In Build options, set the host dir to /opt/your-toolchain-name where
your-toolchain-name would typically be arm-linux-uclibcgnueabi or
something like that (but it can also be anything else)
* In Toolchain, use the Buildroot internal backend, and configure
everything (gcc version, binutils version, etc.)
* In Packages, disable Busybox (i.e no packages at all should be
selected)
* In target filesystems, disable the tarball (i.e no filesystems at
all should be selected)
Then, build with make. You have your toolchain
in /opt/your-toolchain-name. You can erase your Buildroot build and
configuration now.
Now, you can do a second Buildroot to build your system itself,
re-using the toolchain you have created.
In the toolchain menu, select external toolchain, and then Custom
external toolchain. In the toolchain path,
set /opt/your-toolchain-name/usr/, and adjust the
IPv6/RPC/locale/wide-char options to the ones you have used when
building your toolchain. Don't worry if you're not sure here: Buildroot
will check at the beginning of the build all those options and will
abort if anything is incorrect.
Regards,
Thomas Petazzoni
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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