On 2016-12-01 18:35, Paul Eggleton wrote:
On Thu, 01 Dec 2016 10:27:50 Gary Thomas wrote:
I have a build machine where I build for lots of targets.  On
all of these targets (save a primary), I set the SSTATE_MIRROR
to point to the sstate-cache of the primary target.  I always build
for the primary target first, then later the secondary ones.

For the most part, the sstate mechanism works pretty well, but I
see some anomalies.  For example, why on the same host, built back
to back, would a secondary build target (which uses the primary
as it's SSTATE_MIRROR and that build is complete) need to rebuild
from scratch such NATIVE packages as openssl?  Note that these are
native packages I'm asking about, so in my mind they should always
be sharable.

Any ideas?  Is there something I can look at to investigate this?

bitbake-diffsigs is the basic tool to compare signatures when those have
changed. Find the siginfo / sigdata file for one of the early tasks that
executed and compare them to see what changed.

How are you setting SSTATE_MIRRORS in this scenario btw?

file://.* file:///local/p0382_2016-01-13/sstate-cache/PATH"

I ran a build yesterday that caused me to comment on this pattern.  Here are the
siginfo files for the secondary target (the latest build):

-rw-rw-r-- 1 gthomas gthomas 21240 Dec 1 10:12 sstate-cache/universal/99/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:99515597e2223aa4413f7f2e4acf6532_configure.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 8917 Dec 1 10:17 sstate-cache/universal/a4/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:a49c66a9c786fe100f8e8b6e3bbd1e86_compile.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 14864 Dec 1 10:18 sstate-cache/universal/a7/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:a747322ce06467949097c3da58497c7d_install.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 36490 Dec 1 10:18 sstate-cache/universal/e6/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:e65ab886428d88f8735dba617268892f_populate_sysroot.tgz.siginfo

Here are the corresponding ones from my primary target:
-rw-rw-r-- 1 gthomas gthomas 6278 Nov 28 08:11 sstate-cache/44/sstate:openssl-native::1.0.2j:r0::3:44adeda2ff6ac235331af5dae45e45ea_patch.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 4997 Nov 28 08:11 sstate-cache/e9/sstate:openssl-native::1.0.2j:r0::3:e9ccda2229e69e2138ad0465a709e33a_fetch.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 21336 Nov 28 08:13 sstate-cache/universal/99/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:99515597e2223aa4413f7f2e4acf6532_configure.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 8833 Nov 28 08:14 sstate-cache/universal/a4/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:a49c66a9c786fe100f8e8b6e3bbd1e86_compile.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 14750 Nov 28 08:14 sstate-cache/universal/a7/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:a747322ce06467949097c3da58497c7d_install.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 31029 Dec 1 09:45 sstate-cache/57/sstate:openssl-native::1.0.2j:r0::3:5725888ec8cde61e1417bc0b6ea51c6c_populate_lic.tgz.siginfo -rw-rw-r-- 1 gthomas gthomas 36502 Dec 1 09:45 sstate-cache/universal/e6/sstate:openssl-native:x86_64-linux:1.0.2j:r0:x86_64:3:e65ab886428d88f8735dba617268892f_populate_sysroot.tgz.siginfo

Clearly, they are identical and the ones from the primary were built long before
the ones on the secondary target.

I'm still confused why it didn't work as expected.

Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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