(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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