perf build: Add dwarf unwind objects building

Move the dwarf unwind 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_LIBDW_DWARF_UNWIND
-  LIB_OBJS += $(OUTPUT)util/unwind-libdw.o
-  LIB_H += util/unwind-libdw.h
-endif
-
-ifndef NO_LIBUNWIND
-  LIB_OBJS += $(OUTPUT)util/unwind-libunwind.o
-endif
-
 ifndef NO_SLANG
   LIB_OBJS += $(OUTPUT)ui/browser.o
   LIB_OBJS += $(OUTPUT)ui/browsers/annotate.o

tools/perf/config/Makefile

···
     dwarf-post-unwind := 0
   else
     dwarf-post-unwind-text := libdw
+    $(call detected,CONFIG_LIBDW_DWARF_UNWIND)
   endif
 else
   dwarf-post-unwind-text := libunwind
+  $(call detected,CONFIG_LIBUNWIND)
   # Enable libunwind support by default.
   ifndef NO_LIBDW_DWARF_UNWIND
     NO_LIBDW_DWARF_UNWIND := 1

tools/perf/util/Build

···
 libperf-$(CONFIG_DWARF) += probe-finder.o
 libperf-$(CONFIG_DWARF) += dwarf-aux.o
 
+libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
+libperf-$(CONFIG_LIBUNWIND)          += unwind-libunwind.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))"