On 10 September 2013 21:14, David Ahern [off-list ref] wrote:

On 9/9/13 3:00 AM, Jean Pihet wrote:

quoted

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 7014373..54532b8 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile

@@ -222,7 +222,7 @@ endif

  FLAGS_UNWIND=$(LIBUNWIND_CFLAGS) $(CFLAGS) $(LIBUNWIND_LDFLAGS)

$(LDFLAGS) $(EXTLIBS) $(LIBUNWIND_LIBS)
  ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND),libunwind),y)
-  msg := $(warning No libunwind found, disabling post unwind support.
Please install libunwind-dev[el] >= 0.99);
+  msg := $(warning No libunwind found, disabling post unwind support.
Please install libunwind-dev[el] >= 1.1);
    NO_LIBUNWIND := 1
  endif # Libunwind support
  endif # NO_LIBUNWIND

Is the 1.1 version required for x86 too?

Yes if the dwarf unwinding feature is used. I know it is not in use on
x86 as of now but could be in the future since the dwarf info brings
more details in the trace, cf. http://lwn.net/Articles/499116/.

David

Jean