[OE-core] sstate reuse for -native, -cross across different host glibc version, how to make it work?

[Richard Purdie]

On Fri, 2012-03-23 at 13:22 +0100, Koen Kooi wrote:
> I turned on sstate mirroring for angstrom recently and I'm getting
> reports of build failures due to missing GLIBC_2.14 symbols:
> 
> arm-angstrom-linux-gnueabi-gcc: /lib/x86_64-linux-gnu/libc.so.6:
> version `GLIBC_2.14' not found (required by
> arm-angstrom-linux-gnueabi-gcc)
> 
> The sstate tarballs are built on a Fedora16 VM and the breakage occurs
> when it being used on systems with an older c library (e.g. debian).
> To get rid of this problem there are multiple options, but I think the
> 2 most obvious are:
> 
> 1) inject host distroname and distroversion into the checksums
> 2) build everything against a native libc
> 
3) Use an older version on the VM which is the oldest distro you plan to
build against.

> Would it be appropriate to get 1) into oe-core before the branchpoint?

We've talked about this and its been on the "to fix" list but nobody has
got around to it. Its hard as we need to come up with something that
isn't going to kill performance of the checksum calculations. A cat
operation on a few files for each checksum for example isn't
appropriate. We may need to do something at the bitbake level as there
is also the issue of checksuming local files such as those in file://
urls and including that in the sstate checksums.

So whilst I'd love to see fixes for these and they are bugfixes, they're
going to have to be well written patches and its late in cycle for
invasive changes :(.

Cheers,

Richard