perf build: Add dwarf objects building

Move the dwarf objects building under build framework to be included in
the libperf build object.

Signed-off-by: Jiri Olsa <[e-mail]>
Tested-by: Sukadev Bhattiprolu <[e-mail]>
Tested-by: Will Deacon <[e-mail]>
Cc: Alexis Berlemont <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Corey Ashford <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Frederic Weisbecker <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: http://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Makefile.perf

···
   CFLAGS += -I$(OUTPUT)
 endif
 
-ifndef NO_LIBELF
-ifndef NO_DWARF
-  LIB_OBJS += $(OUTPUT)util/probe-finder.o
-  LIB_OBJS += $(OUTPUT)util/dwarf-aux.o
-endif # NO_DWARF
-endif # NO_LIBELF
-
 ifndef NO_LIBDW_DWARF_UNWIND
   LIB_OBJS += $(OUTPUT)util/unwind-libdw.o
   LIB_H += util/unwind-libdw.h

tools/perf/config/Makefile

···
       CFLAGS += -DHAVE_DWARF_SUPPORT $(LIBDW_CFLAGS)
       LDFLAGS += $(LIBDW_LDFLAGS)
       EXTLIBS += -ldw
+      $(call detected,CONFIG_DWARF)
     endif # PERF_HAVE_DWARF_REGS
   endif # NO_DWARF
 endif # NO_LIBELF

tools/perf/util/Build

···
 libperf-y += symbol-minimal.o
 endif
 
+libperf-$(CONFIG_DWARF) += probe-finder.o
+libperf-$(CONFIG_DWARF) += dwarf-aux.o
+
 CFLAGS_config.o   += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
 CFLAGS_exec_cmd.o += -DPERF_EXEC_PATH="BUILD_STR($(perfexecdir_SQ))" -DPREFIX="BUILD_STR($(prefix_SQ))"