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Re: Moving toolchain to other host


Hi Rod!

The biggest concern isn't the host kernel version, instead it's the host GLIBC/EGLIBC version. If you build on a system with too new GLIBC the toolchain won't run on systems with an older GLIBC.

Example: at our R&D company we've standardized on Ubuntu 8.04 LTS, this was a compromise to get a least common denominator between the IT staff and the developers. However, most developers run Ubuntu 9.10 and some don't even use Ubuntu - they use Gentoo, SuSE or Fedora. I have found it possible to support all the developers by building our toolchains on an aging Ubuntu 8.04 32-bit installation. It seems (the symbols of) its GLIBC version is available in all the other distributions used. At least the ones we've tried.

I hope this helps!

Regards
 /Joachim

On 01/23/2010 12:57 AM, Rod Nussbaumer wrote:
Hi all.

Because I have had no end of problems getting ct-ng to build toolchains on my normally designated development host (RHEL 4.X clone), I have created a Debian 5.02 host for the sole purpose of running ct-ng. This seems to work fabulously, so far, and I've been able to generate i686 targeted and ARM targeted toolchains. Me happy.
Now, the question is, can I move those toolchains over to my RHEL 4.X &/or RHEL 5.X host(s), in order to compile code to run on embedded targets? The Redhat boxes are presently running kernels version 2.6.9 & version 2.68.18. If I build against those kernel versions when I build the toolchain, does that buy me anything? What IS the upshot of changing kernel versions when building the toolchains? Can I/should I build a specific version of the C Library with the toolchains?
Now that I'm thinking about, I guess I would give myself the best chance by using versions of all compilers, libraries and kernels that match the versions on the RHEL sort-of target. I suppose that in some sense, I am making a Canadian cross, bu hoping to cheat and just copy the toolchains without targeting them to a different host type. Are there general rules about what object code is runnable on other OS versions?


--- rod.



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