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[Bug 1248289] Re: Missing libunwind support in perf

 

just tested the 4.2 kernel, the issue has not been fixed
it can also be seen in the buildlogs

 52311 config/Makefile:527: No bfd.h/libbfd found, please install binutils-dev[el]/zlib-static/libiberty-dev to gain sym       bol demangling
 52312 config/Makefile:556: No liblzma found, disables xz kernel module decompression, please install xz-devel/liblzma-d       ev


** Changed in: linux (Ubuntu)
       Status: Fix Released => Confirmed

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https://bugs.launchpad.net/bugs/1248289

Title:
  Missing libunwind support in perf

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  I'm trying to use perf's libunwind support in 13.04 with kernel
  3.11.0-12-generic on amd64.  Typically you can do this by using the
  "-g dwarf" flag, but it appears the perf command included in linux-
  tools-3.11.0-12-generic was not compiled with libunwind.  This may be
  as simple as the build machine didn't have libunwind installed.
  Having dwarf support in perf with default Ubuntu kernels would be very
  useful as it provides a way to get profiling information when
  -fomitframepointer is used.

  Relevant upstream code:

  https://github.com/torvalds/linux/blob/v3.11/tools/perf/Makefile#L459
  https://github.com/torvalds/linux/blob/v3.11/tools/perf/builtin-record.c#L758

  Let me know if I can provide any other information.

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References