kbuild: Do not unnecessarily regenerate modules.builtin

Only regenerate it if the configuration has changed. Also, do this after
the modules build to fix errors with some weird Makefiles that are
generated during build.

Reported-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

diff --git a/Makefile b/Makefile
index 2e74a68878c70f9a1c87caa73bf0b227c52fdd7f..160cadadc471e3b8fbc810acbfb37fccb7c5906d 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -882,9 +882,6 @@ $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 PHONY += $(vmlinux-dirs)
 $(vmlinux-dirs): prepare scripts
        $(Q)$(MAKE) $(build)=$@
-ifdef CONFIG_MODULES
-       $(Q)$(MAKE) $(modbuiltin)=$@
-endif
 
 # Build the kernel release string
 #
@@ -1089,7 +1086,7 @@ ifdef CONFIG_MODULES
 
 # By default, build modules as well
 
-all: modules
+all: modules modules.builtin
 
 #      Build modules
 #
@@ -1100,11 +1097,16 @@ all: modules
 PHONY += modules
 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
-       $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
        @$(kecho) '  Building modules, stage 2.';
        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 
+modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
+       $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
+
+%/modules.builtin: include/config/auto.conf | modules
+       $(Q)$(MAKE) $(modbuiltin)=$*
+
 
 # Target to prepare building external modules
 PHONY += modules_prepare