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Commit 405ffbd4 authored by Jean Pihet's avatar Jean Pihet Committed by Will Deacon
Browse files

perf tools: Check libunwind for availability of dwarf parsing feature 

The newly added dwarf unwinding feature [1] requires:
. a recent version (>= 1.1) of libunwind,
. libunwind to be configured with --enable-debug-frame.

[1] http://www.spinics.net/lists/kernel/msg1598951.html



Add the corresponding API tests in the feature check list.

Acked-by: default avatarJiri Olsa <jolsa@redhat.com>
Signed-off-by: default avatarJean Pihet <jean.pihet@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 7495f374

tools/perf/config/Makefile

+5 −1
Original line number Diff line number Diff line
@@ -226,9 +226,13 @@ 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

ifneq ($(call try-cc,$(SOURCE_LIBUNWIND_DEBUG_FRAME),$(FLAGS_UNWIND),libunwind debug_frame),y)

  msg := $(warning No debug_frame support found in libunwind);

CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME

endif # debug_frame support in libunwind

endif # NO_LIBUNWIND



ifndef NO_LIBUNWIND

tools/perf/config/feature-tests.mak

+20 −1
Original line number Diff line number Diff line
@@ -185,7 +185,6 @@ extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as, 
                                      unw_proc_info_t *pi,

                                      int need_unwind_info, void *arg);





#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)



int main(void)
@@ -197,6 +196,26 @@ int main(void) 
	return 0;

}

endef



define SOURCE_LIBUNWIND_DEBUG_FRAME

#include <libunwind.h>

#include <stdlib.h>



extern int

UNW_OBJ(dwarf_find_debug_frame) (int found, unw_dyn_info_t *di_debug,

				 unw_word_t ip, unw_word_t segbase,

				 const char *obj_name, unw_word_t start,

				 unw_word_t end);



#define dwarf_find_debug_frame UNW_OBJ(dwarf_find_debug_frame)



int main(void)

{

	dwarf_find_debug_frame(0, NULL, 0, 0, NULL, 0, 0);

	return 0;

}

endef



endif



ifndef NO_BACKTRACE