kbuild: generate {spl, tpl}-autoconf.mk only when it is necessary

Before this commit, {spl,tpl}-autoconf.mk was always generated
at the top Makefile even if SPL(TPL) build was not selected.

This commit moves the build rule of {spl,tpl}-autoconf.mk
from the top Makefile to spl/Makefile.
It prevents unnecessary {spl,tpl}-autoconf.mk from being
generated.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

Makefile

@@ -890,9 +890,6 @@ tpl/u-boot-tpl.bin:	$(SUBDIR_TOOLS) depend scripts_basic
 # Explicitly make _depend in subdirs containing multiple targets to prevent
 # parallel sub-makes creating .depend files simultaneously.
 depend dep:	$(TIMESTAMP_FILE) $(VERSION_FILE) \
-		include/spl-autoconf.mk \
-		include/tpl-autoconf.mk \
-		include/autoconf.mk \
 		include/generated/generic-asm-offsets.h \
 		include/generated/asm-offsets.h
 
@@ -974,26 +971,6 @@ quiet_cmd_autoconf = GEN     $@
 include/autoconf.mk: include/config.h
 	$(call cmd,autoconf)
 
-# Auto-generate the spl-autoconf.mk file (which is included by all makefiles for SPL)
-quiet_cmd_tpl-autoconf = GEN     $@
-      cmd_tpl-autoconf = \
-	$(CPP) $(c_flags) -DCONFIG_TPL_BUILD  -DCONFIG_SPL_BUILD\
-			-DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
-		sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
-	rm $@.tmp
-
-include/tpl-autoconf.mk: include/config.h
-	$(call cmd,tpl-autoconf)
-
-quiet_cmd_spl-autoconf = GEN     $@
-      cmd_spl-autoconf = \
-	$(CPP) $(c_flags) -DCONFIG_SPL_BUILD -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
-		sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
-	rm $@.tmp
-
-include/spl-autoconf.mk: include/config.h
-	$(call cmd,spl-autoconf)
-
 quiet_cmd_offsets = GEN     $@
       cmd_offsets = $(srctree)/tools/scripts/make-asm-offsets $< $@
 

spl/Makefile

@@ -50,6 +50,22 @@ endif
 
 include $(TOPDIR)/config.mk
 
+# FIX ME
+c_flags := $(KBUILD_CFLAGS) $(KBUILD_CPPFLAGS) $(CPPFLAGS) $(UBOOTINCLUDE) $(NOSTDINC_FLAGS)
+
+# Auto-generate the spl-autoconf.mk file (which is included by all makefiles for SPL)
+quiet_cmd_autoconf = GEN     $@
+      cmd_autoconf = \
+	$(CPP) $(c_flags) -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
+		sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
+	rm $@.tmp
+
+include/tpl-autoconf.mk: include/config.h
+	$(call cmd,autoconf)
+
+include/spl-autoconf.mk: include/config.h
+	$(call cmd,autoconf)
+
 HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(SRCTREE)/board/$(VENDOR)/common/Makefile),y,n)
 
 ifdef	CONFIG_SPL_START_S_PATH