Merge branch 'gcc421' into 'master'

Improve compatibility with gcc-4.2.1

See merge request !21
19 jobs for master in 11 minutes and 7 seconds (queued for 8 seconds)
Name Stage Failure
failed
build_macosx_34 Build There is an unknown failure, please try again
    zc.buildout.easy_install.call_subprocess(args)
File "/Users/buildbot/work/gitlab-ci/f6f95b82/1/bob/bob.learn.em/eggs/zc.buildout-2.7.1-py3.4.egg/zc/buildout/easy_install.py", line 155, in call_subprocess
% repr(args)[1:-1])
Exception: Failed to run command:
'/Users/buildbot/work/gitlab-ci/f6f95b82/1/bob/bob.learn.em/build-prefix/bin/python', '/var/folders/8n/phc2t7ln52l2srkgv49ybfj00001fc/T/tmps90rxej0', '-v', 'develop', '-mxN', '-d', '/Users/buildbot/work/gitlab-ci/f6f95b82/1/bob/bob.learn.em/develop-eggs/tmpb4efub85build'
(01:45:20)
Error: Command Failed "./bin/buildout"
Running after script...
$ ./_ci/after_build.sh
ERROR: Build failed: exit status 1
failed
build_linux_35 Build There is an unknown failure, please try again
    zc.buildout.easy_install.call_subprocess(args)
File "/home/gitlab-runner/builds/0d638152/2/bob/bob.learn.em/eggs/zc.buildout-2.7.1-py3.5.egg/zc/buildout/easy_install.py", line 155, in call_subprocess
% repr(args)[1:-1])
Exception: Failed to run command:
'/home/gitlab-runner/builds/0d638152/2/bob/bob.learn.em/build-prefix/bin/python', '/tmp/tmp8kr16ws8', '-v', 'develop', '-mxN', '-d', '/home/gitlab-runner/builds/0d638152/2/bob/bob.learn.em/develop-eggs/tmpu78x_5v7build'
(01:36:46)
Error: Command Failed "./bin/buildout"
Running after script...
$ ./_ci/after_build.sh
ERROR: Build failed: exit status 1
failed
build_macosx_27 Build There is an unknown failure, please try again
    zc.buildout.easy_install.call_subprocess(args)
File "/Users/buildbot/work/gitlab-ci/f6f95b82/0/bob/bob.learn.em/eggs/zc.buildout-2.7.1-py2.7.egg/zc/buildout/easy_install.py", line 155, in call_subprocess
% repr(args)[1:-1])
Exception: Failed to run command:
'/Users/buildbot/work/gitlab-ci/f6f95b82/0/bob/bob.learn.em/build-prefix/bin/python', '/var/folders/8n/phc2t7ln52l2srkgv49ybfj00001fc/T/tmpmi347U', '-v', 'develop', '-mxN', '-d', '/Users/buildbot/work/gitlab-ci/f6f95b82/0/bob/bob.learn.em/develop-eggs/tmpCn7ZTTbuild'
(01:45:32)
Error: Command Failed "./bin/buildout"
Running after script...
$ ./_ci/after_build.sh
ERROR: Build failed: exit status 1
failed
build_linux_27 Build There is an unknown failure, please try again
    zc.buildout.easy_install.call_subprocess(args)
File "/home/gitlab-runner/builds/0d638152/0/bob/bob.learn.em/eggs/zc.buildout-2.7.1-py2.7.egg/zc/buildout/easy_install.py", line 155, in call_subprocess
% repr(args)[1:-1])
Exception: Failed to run command:
'/home/gitlab-runner/builds/0d638152/0/bob/bob.learn.em/build-prefix/bin/python', '/tmp/tmpn_LaD3', '-v', 'develop', '-mxN', '-d', '/home/gitlab-runner/builds/0d638152/0/bob/bob.learn.em/develop-eggs/tmpb5zwjsbuild'
(01:36:47)
Error: Command Failed "./bin/buildout"
Running after script...
$ ./_ci/after_build.sh
ERROR: Build failed: exit status 1
failed
build_macosx_35 Build There is an unknown failure, please try again
    zc.buildout.easy_install.call_subprocess(args)
File "/Users/buildbot/work/gitlab-ci/f6f95b82/2/bob/bob.learn.em/eggs/zc.buildout-2.7.1-py3.5.egg/zc/buildout/easy_install.py", line 155, in call_subprocess
% repr(args)[1:-1])
Exception: Failed to run command:
'/Users/buildbot/work/gitlab-ci/f6f95b82/2/bob/bob.learn.em/build-prefix/bin/python', '/var/folders/8n/phc2t7ln52l2srkgv49ybfj00001fc/T/tmpw_a6zj6m', '-v', 'develop', '-mxN', '-d', '/Users/buildbot/work/gitlab-ci/f6f95b82/2/bob/bob.learn.em/develop-eggs/tmpg3hn_4tmbuild'
(01:45:21)
Error: Command Failed "./bin/buildout"
Running after script...
$ ./_ci/after_build.sh
ERROR: Build failed: exit status 1
failed
build_linux_34 Build There is an unknown failure, please try again
    zc.buildout.easy_install.call_subprocess(args)
File "/home/gitlab-runner/builds/0d638152/1/bob/bob.learn.em/eggs/zc.buildout-2.7.1-py3.4.egg/zc/buildout/easy_install.py", line 155, in call_subprocess
% repr(args)[1:-1])
Exception: Failed to run command:
'/home/gitlab-runner/builds/0d638152/1/bob/bob.learn.em/build-prefix/bin/python', '/tmp/tmpb2h7w6m1', '-v', 'develop', '-mxN', '-d', '/home/gitlab-runner/builds/0d638152/1/bob/bob.learn.em/develop-eggs/tmpcpjk9ndsbuild'
(01:36:47)
Error: Command Failed "./bin/buildout"
Running after script...
$ ./_ci/after_build.sh
ERROR: Build failed: exit status 1