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authorMasahiro Yamada <yamada.m@jp.panasonic.com>2014-02-04 17:24:24 +0900
committerTom Rini <trini@ti.com>2014-02-19 11:07:50 -0500
commit9e4140329ee9a787d0f96ac2829d618d47f7973f (patch)
tree6a40432f6f6723ba9ac5309076af17aec3bc0a9b /nand_spl/board/amcc/kilauea/Makefile
parentd958002589cb724907e8d4360d546403d1e6b7d8 (diff)
downloadblackbird-obmc-uboot-9e4140329ee9a787d0f96ac2829d618d47f7973f.tar.gz
blackbird-obmc-uboot-9e4140329ee9a787d0f96ac2829d618d47f7973f.zip
kbuild: change out-of-tree build
This commit changes the working directory where the build process occurs. Before this commit, build process occurred under the source tree for both in-tree and out-of-tree build. That's why we needed to add $(obj) prefix to all generated files in makefiles like follows: $(obj)u-boot.bin: $(obj)u-boot Here, $(obj) is empty for in-tree build, whereas it points to the output directory for out-of-tree build. And our old build system changes the current working directory with "make -C <sub-dir>" syntax when descending into the sub-directories. On the other hand, Kbuild uses a different idea to handle out-of-tree build and directory descending. The build process of Kbuild always occurs under the output tree. When "O=dir/to/store/output/files" is given, the build system changes the current working directory to that directory and restarts the make. Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=<sub-dir>" syntax for descending into sub-directories. (We can write it like "make $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Tested-by: Gerhard Sittig <gsi@denx.de>
Diffstat (limited to 'nand_spl/board/amcc/kilauea/Makefile')
-rw-r--r--nand_spl/board/amcc/kilauea/Makefile28
1 files changed, 10 insertions, 18 deletions
diff --git a/nand_spl/board/amcc/kilauea/Makefile b/nand_spl/board/amcc/kilauea/Makefile
index 9d07147d40..1c5498cfa5 100644
--- a/nand_spl/board/amcc/kilauea/Makefile
+++ b/nand_spl/board/amcc/kilauea/Makefile
@@ -18,8 +18,8 @@ CFLAGS += -DCONFIG_NAND_SPL
SOBJS = start.o resetvec.o cache.o
COBJS = 44x_spd_ddr2.o nand_boot.o nand_ecc.o ndfc.o
-SRCS := $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS := $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS := $(addprefix $(obj)/,$(SOBJS) $(COBJS))
__OBJS := $(SOBJS) $(COBJS)
LNDIR := $(nandobj)board/$(BOARDDIR)
@@ -41,44 +41,36 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
# create symbolic links for common files
# from cpu directory
-$(obj)44x_spd_ddr2.c: $(obj)ecc.h
+$(obj)/44x_spd_ddr2.c: $(obj)/ecc.h
@rm -f $@
ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c $@
-$(obj)cache.S:
+$(obj)/cache.S:
@rm -f $@
ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/cache.S $@
-$(obj)ecc.h:
+$(obj)/ecc.h:
@rm -f $@
ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/ecc.h $@
-$(obj)ndfc.c:
+$(obj)/ndfc.c:
@rm -f $@
ln -s $(SRCTREE)/drivers/mtd/nand/ndfc.c $@
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
@rm -f $@
ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/resetvec.S $@
-$(obj)start.S:
+$(obj)/start.S:
@rm -f $@
ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/start.S $@
# from nand_spl directory
-$(obj)nand_boot.c:
+$(obj)/nand_boot.c:
@rm -f $@
ln -s $(SRCTREE)/nand_spl/nand_boot.c $@
# from drivers/nand directory
-$(obj)nand_ecc.c:
+$(obj)/nand_ecc.c:
@rm -f $@
ln -s $(SRCTREE)/drivers/mtd/nand/nand_ecc.c $@
-
-#########################################################################
-
-$(obj)%.o: $(obj)%.S
- $(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o: $(obj)%.c
- $(CC) $(CFLAGS) -c -o $@ $<
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