autobuild[sn-devel-144]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-11-24-0121/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-11-24-0121/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-11-24-0121/samba.stdout
  
The top commit at the time of the failure was:

commit 667335a42d683f73ec9c52c68730041d83a163a5
Author: Uri Simchoni <uri at samba.org>
Date:   Mon Nov 20 20:53:12 2017 +0000

    build: ensure compiler flags are properly detected
    
    While checking for compiler flag availability, treat warnings
    as errors. Thus if the compiler only warns about unsupported flag,
    it will fail the test and the flag shall be marked as unsupported.
    
    Signed-off-by: Uri Simchoni <uri at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Wed Nov 22 14:19:20 CET 2017 on sn-devel-144