Makefile: prepare for using Kbuild-style Makefile
[karo-tx-uboot.git] / spl / Makefile
index b366ac2..64ebfb7 100644 (file)
@@ -200,11 +200,29 @@ GEN_UBOOT = \
 $(obj)$(SPL_BIN):      depend $(START) $(LIBS) $(obj)u-boot-spl.lds
        $(GEN_UBOOT)
 
+# Tentative step for Kbuild-style makefiles coexist with conventional U-Boot style makefiles
+#  U-Boot conventional sub makefiles always include some other makefiles.
+#  So, the build system searches a line beginning with "include" before entering into the sub makefile
+#  in order to distinguish which style it is.
+#  If the Makefile include a "include" line, we assume it is an U-Boot style makefile.
+#  Otherwise, it is treated as a Kbuild-style makefile.
+select_makefile = \
+       if grep -q "^include" $1/Makefile; then                         \
+               $(MAKE) -C $1;                                          \
+       else                                                            \
+               $(MAKE) -C $1 -f $(TOPDIR)/scripts/Makefile.build;      \
+               mv $(dir $@)built-in.o $@;                              \
+       fi
+
+# We do not need to build $(START) explicitly.
+# It is built while we are at $(CPUDIR)/lib$(CPU).o build.
 $(START):      depend
-       $(MAKE) -C $(SRCTREE)/$(START_PATH) $@
+       if grep -q "^include" $(SRCTREE)$(dir $(subst $(SPLTREE),,$@))Makefile; then \
+               $(MAKE) -C $(SRCTREE)/$(START_PATH) $@; \
+       fi
 
 $(LIBS):       depend
-       $(MAKE) -C $(SRCTREE)$(dir $(subst $(SPLTREE),,$@))
+       +$(call select_makefile, $(SRCTREE)$(dir $(subst $(SPLTREE),,$@)))
 
 $(obj)u-boot-spl.lds: $(LDSCRIPT) depend
        $(CPP) $(CPPFLAGS) $(LDPPFLAGS) -I$(obj). -ansi -D__ASSEMBLY__ -P - < $< > $@