[RFC Patch] kbuild: implement "make foo.s_c"

[Amerigo Wang]

This patch implements "make path/to/file.s_c", where
"file.s_c" is a file contains both asm and C code, this
is helpful for people to do debugging at asm level.

Currently, we have "make path/to/file.s", but it sucks,
the asm code generated by it is not human-friendly.

Compare "make kernel/spinlock.s" with "make kernel/spinlock.s_c",
as an example.

Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>

---
diff --git a/.gitignore b/.gitignore
index b93fb7e..119e00a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@
 *.o.*
 *.a
 *.s
+*.s_c
 *.ko
 *.so
 *.so.dbg
diff --git a/Makefile b/Makefile
index 25c615e..9024b42 100644
--- a/Makefile
+++ b/Makefile
@@ -1216,7 +1216,7 @@ clean: archclean $(clean-dirs)
 	@find . $(RCS_FIND_IGNORE) \
 		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-		-o -name '*.symtypes' -o -name 'modules.order' \
+		-o -name '*.s_c' -o -name '*.symtypes' -o -name 'modules.order' \
 		-o -name 'Module.markers' -o -name '.tmp_*.o.*' \
 		-o -name '*.gcno' \) -type f -print | xargs rm -f
 
@@ -1520,6 +1520,8 @@ endif
 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 %.s: %.S prepare scripts FORCE
 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+%.s_c: %.c prepare scripts FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 %.o: %.S prepare scripts FORCE
 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
 %.symtypes: %.c prepare scripts FORCE
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 5c4b7a4..e5763ac 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -148,6 +148,11 @@ cmd_cc_s_c       = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
 $(obj)/%.s: $(src)/%.c FORCE
 	$(call if_changed_dep,cc_s_c)
 
+cmd_cc_s_c_c       = $(OBJDUMP) -d -S $< >$@
+
+$(obj)/%.s_c: $(src)/%.o FORCE
+	$(call if_changed,cc_s_c_c)
+
 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
 cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 
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