v4.19.13 snapshot.
diff --git a/tools/objtool/Build b/tools/objtool/Build
new file mode 100644
index 0000000..749becd
--- /dev/null
+++ b/tools/objtool/Build
@@ -0,0 +1,22 @@
+objtool-y += arch/$(SRCARCH)/
+objtool-y += builtin-check.o
+objtool-y += builtin-orc.o
+objtool-y += check.o
+objtool-y += orc_gen.o
+objtool-y += orc_dump.o
+objtool-y += elf.o
+objtool-y += special.o
+objtool-y += objtool.o
+
+objtool-y += libstring.o
+objtool-y += str_error_r.o
+
+CFLAGS += -I$(srctree)/tools/lib
+
+$(OUTPUT)libstring.o: ../lib/string.c FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)
+
+$(OUTPUT)str_error_r.o: ../lib/str_error_r.c FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)