Fix up Compiler levels for PPC machines

[mhdawson]

Compilers on PPC were update to 4.9 recently.

What I'd like to do is:

1. On BE just revert. We are already working on dropping BE from builds for 8.X and later. (I've removed from main download page, next step is to stop building in releases). (4.9 is only need to build later releases)

2. on LE leave it at 4.9, validate that the binaries run on machines with gcc 4.8 installed and if ok update the release machine to match.

3. Figure out how we have multiple compilers on each machine. We are likely to need this in the future and it would be good to know how we are going to accomplish this going forward.

4. Update the ansible scripts so they do the right thing on PPC again.

[mhdawson]

@jBarz @refack FYI

[seishun]

I assume BE will be dropped from CI as well?

[gibfahn]

I assume BE will be dropped from CI as well?

For newer release lines yes.

[mhdawson]

@seishun as gibfahn says, BE machines will still be in the CI and will be used to test the release lines before 8.X. The CI jobs will be updated to that for BE they don't run and simply pass as we have done in other similar instances.

[mhdawson]

Added this to release job

if [[ $ARCH == ppc64 && ${NODE_MAJOR_VERSION} -gt 7 ]]; then
  echo "Not building $disttype on PPC Big Endian slave $NODE_NAME as not supported for v8.x and later"
  exit 0
fi

So we'll no longer build on for releases 8.x and above on PPC Big Endian.

Will keep an eye on builds for next little while to make sure it does the right thing (I tested in a separate job and I believe it is good) and then add to test jobs.

[mhdawson]

Note that archi is ppc64le for the LE machines so PPC sill still build on PPC LE for all versions.

[refack]

Because of incompatibility with the libuv test jobs, I had to revert the default to gcc4.8 on all the 4 ppc machines (gcc4.9 is still installed).
Now we just need to add a condition that will pick gcc4.9 for node>=9

[mhdawson]

@refack be-1 seems broken now for Node.js test, while be-2 seems ok.

The failures are:

test-commit-plinux/nodes/ppcbe-ubuntu1404/out/Release/obj.target/v8_init/deps/v8/src/setup-isolate-full.o ../deps/v8/src/setup-isolate-full.cc
In file included from ../deps/v8/src/base/logging.h:8:0,
                 from ../deps/v8/src/setup-isolate-full.cc:7:
/usr/include/c++/4.8/cstring:41:28: fatal error: bits/c++config.h: No such file or directory
 #include <bits/c++config.h>
                            ^
compilation terminated.
make[2]: *** [/home/iojs/build/wor

[mhdawson]

Is it possible you missed some steps on be-1 ?

Can you also list the exact steps you followed so that we know how to update the ansible scripts to get to the same state ?

[mhdawson]

Good forward, one more request is that we only change 1 machine at a time, validate that all is ok for a few days and then update the second machine once we are confident in the changes.

[mhdawson]

Seems like only be-1 of the 2 BE machines were reverted.

root@test-osuosl-ubuntu1404-ppc64-be-2:~# gcc --version
gcc (Ubuntu 4.9.4-2ubuntu1~14.04.1) 4.9.4
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Last login: Thu Nov 30 17:49:56 2017 from 32.97.110.56
root@test-osuosl-ubuntu1404-ppc64-be-1:~# gcc --version
gcc (Ubuntu 4.8.5-2ubuntu1~14.04.1) 4.8.5
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

So seems the revert has not reverted back to the prior state.

Both the le machines look like they were reversted.

[mhdawson]

One thing I think may be related is that I think the default on PPCBE is 32 bit versus the 64 bit compiler and that may be related.

[mhdawson]

@refack is it possible when installing/reverting 'g++-4.8-multilib' may have been removed ?

[mhdawson]

I think that multilib may no longer be there:

root@test-osuosl-ubuntu1404-ppc64-be-1:~# dpkg -l g++-4.8-multilib
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                               Version                Architecture           Description
+++-==================================-======================-======================-==========================================================================
un  g++-4.8-multilib                   <none>                 <none>                 (no description available)