kbuild: detect objtool update without using .SECONDEXPANSION

Redo commit 8852c5524029 ("kbuild: Fix objtool dependency for
'OBJECT_FILES_NON_STANDARD_<obj> := n'") to add the objtool
dependency in a cleaner way.

Using .SECONDEXPANSION ends up with unreadable code due to escaped
dollars. Also, it is not efficient because the second half of
Makefile.build is parsed twice every time.

Append the objtool dependency to the *.cmd files at the build time.

This is what fixdep and gen_ksymdeps.sh already do. So, following the
same pattern seems a natural solution.

This allows us to drop $$(objtool_dep) entirely.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 720a86642f488ec13eafa8116bbe198a06147f0d..21b55f37a23fd20a94fb6a551d1155a180113b9f 100644 (file)
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -246,14 +246,11 @@ objtool-enabled = $(if $(filter-out y%, \
        $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y)
 
 cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
-objtool_obj = $(if $(objtool-enabled), $(objtool))
+cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
 
 endif # CONFIG_LTO_CLANG
 endif # CONFIG_STACK_VALIDATION
 
-# Rebuild all objects when objtool changes
-objtool_dep = $(objtool_obj)
-
 ifdef CONFIG_TRIM_UNUSED_KSYMS
 cmd_gen_ksymdeps = \
        $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
@@ -267,6 +264,7 @@ define rule_cc_o_c
        $(call cmd,gen_ksymdeps)
        $(call cmd,checksrc)
        $(call cmd,checkdoc)
+       $(call cmd,gen_objtooldep)
        $(call cmd,modversions_c)
        $(call cmd,record_mcount)
 endef
@@ -274,12 +272,12 @@ endef
 define rule_as_o_S
        $(call cmd_and_fixdep,as_o_S)
        $(call cmd,gen_ksymdeps)
+       $(call cmd,gen_objtooldep)
        $(call cmd,modversions_S)
 endef
 
 # Built-in and composite module parts
-.SECONDEXPANSION:
-$(obj)/%.o: $(src)/%.c $(recordmcount_source) $$(objtool_dep) FORCE
+$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
        $(call if_changed_rule,cc_o_c)
        $(call cmd,force_checksrc)
 
@@ -380,7 +378,7 @@ cmd_modversions_S =                                                         \
        fi
 endif
 
-$(obj)/%.o: $(src)/%.S $$(objtool_dep) FORCE
+$(obj)/%.o: $(src)/%.S FORCE
        $(call if_changed_rule,as_o_S)
 
 targets += $(filter-out $(subdir-builtin), $(real-obj-y))