linux-kernel - Re: [GIT PULL 0/4] perf/urgent fixes

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Date:	Wed, 23 Apr 2014 15:14:33 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jean Pihet <jean.pihet@...aro.org>,
	Josh Boyer <jwboyer@...oraproject.org>,
	Masanari Iida <standby24x7@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [GIT PULL 0/4] perf/urgent fixes


(Just reporting two bugs I found today - unrelated to your the 
perf/urgent pull request.)

1)

Even when the most modern unwind library is found, the autodetection 
is spammy:


 Auto-detecting system features:
 ...                         dwarf: [ on  ]
 ...                         glibc: [ on  ]
 ...                          gtk2: [ on  ]
 ...                      libaudit: [ on  ]
 ...                        libbfd: [ on  ]
 ...                        libelf: [ on  ]
 ...                       libnuma: [ on  ]
 ...                       libperl: [ on  ]
 ...                     libpython: [ on  ]
 ...                      libslang: [ on  ]
 ...                     libunwind: [ on  ]
 ...            libdw-dwarf-unwind: [ on  ]
 ...     DWARF post unwind library: libunwind

The 'DWARF post unwind library' line is somewhat superfluous. I 
realize that it prints out the library selected - but that's obvious 
from the 'libdw-dwarf-unwind' line above it already, right?

Furthermore, it breaks the autodetection output format.

2)

On latest Ubuntu (14.04) the tip:master build fails with:

 /usr/bin/ld: cannot find -liberty
 collect2: error: ld returned 1 exit status

The autodetection sequence reports all green entries, so something's 
funky going on there.

Thanks,

	Ingo
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