kbuild: add cmd_and_savecmd macro

JIRA: https://issues.redhat.com/browse/RHEL-2773

commit ebd191b
Author: Masahiro Yamada <masahiroy@kernel.org>
Date:   Fri May 27 19:01:54 2022 +0900

    kbuild: add cmd_and_savecmd macro

    Separate out the command execution part of if_changed, as we did
    for if_changed_dep.

    This allows us to reuse it in if_changed_rule.

      define rule_foo
              $(call cmd_and_savecmd,foo)
              $(call cmd,bar)
      endef

    Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
    Reviewed-by: Kees Cook <keescook@chromium.org>
    Tested-by: Nathan Chancellor <nathan@kernel.org>
    Reviewed-by: Nicolas Schier <n.schier@avm.de>
    Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>

Author: joe-lawrence

scripts/Kbuild.include

@@ -154,9 +154,11 @@ check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing)
 if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE)
 
 # Execute command if command has changed or prerequisite(s) are updated.
-if_changed = $(if $(if-changed-cond),                                        \
+if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:)
+
+cmd_and_savecmd =                                                            \
 	$(cmd);                                                              \
-	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
+	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd
 
 # Execute the command and also postprocess generated .d dependencies file.
 if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:)