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authorMasahiro Yamada <yamada.m@jp.panasonic.com>2013-10-17 17:34:47 +0900
committerTom Rini <trini@ti.com>2013-10-31 12:53:39 -0400
commitce28d7ac6d64c8a730334c8584742cf7255ad318 (patch)
treed8a3cc7f649f1674f1aeb661e0986a8413b46be2 /scripts
parent9d33fb4a5cfe2767f389cc64ba16c21906e36856 (diff)
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Makefile: prepare for using Kbuild-style Makefile
Every makefile in sub directories has common lines at the top and the bottom. This commit pushes the common parts into script/Makefile.build. Going forward sub-makefiles only need to describe this part: COBJS := ... COBJS += ... SOBJS := ... But using obj-y is preferable to prepare for switching to Kbuild. The conventional (non-Kbuild) Makefile style is still supported. This is achieved by greping the Makefile before entering into it. U-Boot conventional sub makefiles always include some other makefiles. So the build system searches a line beginning with "include" keyword in the makefile in order to distinguish which style it is. If the Makefile include a "include" line, we assume it is a conventional U-Boot style. Otherwise, it is treated as a Kbuild-style makefile. With this tweak, we can switch sub-makefiles from U-Boot style to Kbuild style little by little. obj-y := foo/ syntax (descending into the sub directory) is not supportd yet. It will be implemented in the upcomming commit. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@ti.com>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.build48
1 files changed, 48 insertions, 0 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
new file mode 100644
index 0000000..f969ec5
--- /dev/null
+++ b/scripts/Makefile.build
@@ -0,0 +1,48 @@
+# our default target
+.PHONY: all
+all:
+
+include $(TOPDIR)/config.mk
+
+LIB := $(obj)built-in.o
+LIBGCC = $(obj)libgcc.o
+SRCS :=
+
+include Makefile
+
+# Backward compatible: obj-y is preferable
+COBJS := $(sort $(COBJS) $(COBJS-y))
+SOBJS := $(sort $(SOBJS) $(SOBJS-y))
+
+# Going forward use the following
+obj-y := $(sort $(obj-y))
+extra-y := $(sort $(extra-y))
+lib-y := $(sort $(lib-y))
+
+SRCS += $(COBJS:.o=.c) $(SOBJS:.o=.S) \
+ $(wildcard $(obj-y:.o=.c) $(obj-y:.o=.S) $(lib-y:.o=.c) $(lib-y:.o=.S) $(extra-y:.o=.c) $(extra-y:.o=.S))
+OBJS := $(addprefix $(obj),$(COBJS) $(SOBJS) $(obj-y))
+
+LGOBJS := $(addprefix $(obj),$(sort $(GLSOBJS) $(GLCOBJS)) $(lib-y))
+
+all: $(LIB) $(addprefix $(obj),$(extra-y))
+
+$(LIB): $(obj).depend $(OBJS)
+ $(call cmd_link_o_target, $(OBJS))
+
+ifneq ($(strip $(lib-y)),)
+all: $(LIBGCC)
+
+$(LIBGCC): $(obj).depend $(LGOBJS)
+ $(call cmd_link_o_target, $(LGOBJS))
+endif
+
+#########################################################################
+
+# defines $(obj).depend target
+
+include $(TOPDIR)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################