kbuild: use Linux Kernel build scripts

Now we are ready to switch over to real Kbuild.

This commit disables temporary scripts:
  scripts/{Makefile.build.tmp, Makefile.host.tmp}
and enables real Kbuild scripts:
  scripts/{Makefile.build,Makefile.host,Makefile.lib}.

This switch is triggered by the line in scripts/Kbuild.include
  -build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build.tmp obj
  +build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj

We need to adjust some build scripts for U-Boot.
But smaller amount of modification is preferable.

Additionally, we need to fix compiler flags which are
locally added or removed.

In Kbuild, it is not allowed to change CFLAGS locally.
Instead, ccflags-y, asflags-y, cppflags-y,
CFLAGS_$(basetarget).o, CFLAGS_REMOVE_$(basetarget).o
are prepared for that purpose.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>

1 files changed, 14 insertions, 15 deletions

diff --git a/post/lib_powerpc/fpu/Makefile b/post/lib_powerpc/fpu/Makefile
index c720a26f61..556a833f6d 100644
--- a/post/lib_powerpc/fpu/Makefile
+++ b/post/lib_powerpc/fpu/Makefile
@@ -5,20 +5,19 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y	+= 20001122-1.o
-obj-y	+= 20010114-2.o
-obj-y	+= 20010226-1.o
-obj-y	+= 980619-1.o
-obj-y	+= acc1.o
-obj-y	+= compare-fp-1.o
-obj-y	+= fpu.o
-obj-y	+= mul-subnormal-single-1.o
-obj-y	+= darwin-ldouble.o
+objs-before-objcopy := 20001122-1.o 20010114-2.o 20010226-1.o 980619-1.o \
+	acc1.o compare-fp-1.o fpu.o mul-subnormal-single-1.o darwin-ldouble.o
+targets += $(objs-before-objcopy)
 
-CFLAGS := $(shell echo $(CFLAGS) | sed s/-msoft-float//)
-CFLAGS += -mhard-float -fkeep-inline-functions
+# remove -msoft-float flag
+$(foreach m, $(objs-before-objcopy), $(eval CFLAGS_REMOVE_$m := -msoft-float))
+ccflags-y := -mhard-float -fkeep-inline-functions
 
-$(addprefix $(obj)/,$(obj-y)): $(obj)/%.o: $(src)/%.c
-	$(CC)  $(ALL_CFLAGS) -o $@.fp $< -c
-	$(OBJCOPY) -R .gnu.attributes $@.fp $@
-	rm -f $@.fp
+# Do not delete intermidiate files (*.o)
+.SECONDARY: $(call objectify, $(objs-before-objcopy))
+
+obj-y := $(objs-before-objcopy:.o=_.o)
+
+OBJCOPYFLAGS := -R .gnu.attributes
+$(obj)/%_.o: $(obj)/%.o
+	$(call if_changed,objcopy)