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    Subject[RFC PATCH 09/11] perf: Add libunwind dependency for dwarf cfi unwinding
    Date
    This is not mandatory, but required to get dwarf cfi unwinding
    support.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Cyrill Gorcunov <gorcunov@openvz.org>
    Cc: Tom Zanussi <tzanussi@gmail.com>
    Cc: Masami Hiramatsu <mhiramat@redhat.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Robert Richter <robert.richter@amd.com>
    Cc: Frank Ch. Eigler <fche@redhat.com>
    ---
    tools/perf/Makefile | 19 +++++++++++++++++++
    tools/perf/feature-tests.mak | 14 ++++++++++++++
    2 files changed, 33 insertions(+), 0 deletions(-)

    diff --git a/tools/perf/Makefile b/tools/perf/Makefile
    index addef2f..0c46ac7 100644
    --- a/tools/perf/Makefile
    +++ b/tools/perf/Makefile
    @@ -518,6 +518,20 @@ ifneq ($(call try-cc,$(SOURCE_DWARF),$(FLAGS_DWARF)),y)
    endif # Dwarf support
    endif # NO_DWARF

    +
    +# Only x86-32 is supported for now
    +ifneq ($(ARCH),x86)
    + NO_LIBUNWIND := 1
    +endif
    +
    +ifndef NO_LIBUNWIND
    +FLAGS_UNWIND=$(ALL_CFLAGS) -lunwind-x86 -lunwind-ptrace $(ALL_LDFLAGS) $(EXTLIBS)
    +ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND)),y)
    + msg := $(warning No libunwind found. Please install libunwind >= 0.99);
    + NO_LIBUNWIND := 1
    +endif # Libunwind support
    +endif # NO_LIBUNWIND
    +
    -include arch/$(ARCH)/Makefile

    ifeq ($(uname_S),Darwin)
    @@ -564,6 +578,11 @@ else
    endif # PERF_HAVE_DWARF_REGS
    endif # NO_DWARF

    +ifndef NO_LIBUNWIND
    + BASIC_CFLAGS += -DLIBUNWIND_SUPPORT
    + EXTLIBS += -lunwind-ptrace -lunwind-x86
    +endif
    +
    ifdef NO_NEWT
    BASIC_CFLAGS += -DNO_NEWT_SUPPORT
    else
    diff --git a/tools/perf/feature-tests.mak b/tools/perf/feature-tests.mak
    index b253db6..367b213 100644
    --- a/tools/perf/feature-tests.mak
    +++ b/tools/perf/feature-tests.mak
    @@ -90,6 +90,20 @@ int main(void)
    endef
    endif

    +ifndef NO_LIBUNWIND
    +define SOURCE_LIBUNWIND
    +#include <libunwind.h>
    +#include <stdlib.h>
    +
    +int main(void)
    +{
    + unw_addr_space_t addr_space;
    + addr_space = unw_create_addr_space(NULL, 0);
    + return 0;
    +}
    +endef
    +endif
    +
    define SOURCE_BFD
    #include <bfd.h>

    --
    1.6.2.3


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