[oe] [RFC] Bring PREFERRED_LIBC to all distros

[Khem Raj]

On (27/04/09 07:19), Tom Rini wrote:
> Hey all.  I've created a new branch, trini/add-libc-overrides which does
> the following:
> - Make every distro declare PREFERRED_LIBC, either outright or
>   overridable.

may be you should call it something like SYSTEM_LIBC

> - For Angstrom/foonas have DISTROVAR ?= ${PREFERRED_LIBC},
>   PREFERRED_LIBC ?= default
> - Add conf/distro/include/{eglibc,glibc,uclibc}.inc that have:
>   - Add 'glibc' to OVERRIDES for eglibc/glibc and 'uclibc' for
>     uclibc.inc

what about klibc so some distro's use klibc too ?

>   - Default providers.
>   NOTE: ${TARGET_PREFIX} includes ${TARGET_VENDOR} so ...
> - Switch all distros to have:
>   require conf/distro/include/${PREFERED_LIBC}.inc
>   - Clean up distro-specific includes, and sane-toolchain.inc a little
>     bit by removing all of the PREFERRED_PROVIDER stuff it no longer
>     needs.
> - For glibc*.bb older than 2.5, add in some missing RPROVIDES.

OK

> 
> That last change was required so that a number of distros would parse
> without trying to build say both glibc_2.3.3 and glibc_2.9 (for
> virtual-libc-dev) when I ran bitbake -g meta-toolchain minimal-image.
> 
> The next step, once something like this goes in, would be to change all
> of the overrides that test for uclibc (or glibc) from
> linux/linux-gnueabi vs linux-uclibc/linux-uclibcgnueabi to just
> linux_glibc vs linux_uclibc.

only those two ? or one for each libc we have.

> 
> That branch has been tested with bitbake -g meta-toolchain minimal image
> for every distro for nslu2be nslu2le and beagleboard (arm/armeb/newer
> arm) before and after, and the only differences are the stuff that now
> parses thanks to the glibc changes.  I've got a loop going now with
> qemux86 db1200 and mpc8313e-rdb but don't expect any problems.  I'll be
> following up with the patches shortly.


general approach is good.

> 
> -- 
> Tom Rini
> 
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