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author | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2014-02-04 17:24:24 +0900 |
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committer | Tom Rini <trini@ti.com> | 2014-02-19 11:07:50 -0500 |
commit | 9e4140329ee9a787d0f96ac2829d618d47f7973f (patch) | |
tree | 6a40432f6f6723ba9ac5309076af17aec3bc0a9b /nand_spl/board/amcc/bamboo | |
parent | d958002589cb724907e8d4360d546403d1e6b7d8 (diff) | |
download | u-boot-imx-9e4140329ee9a787d0f96ac2829d618d47f7973f.zip u-boot-imx-9e4140329ee9a787d0f96ac2829d618d47f7973f.tar.gz u-boot-imx-9e4140329ee9a787d0f96ac2829d618d47f7973f.tar.bz2 |
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/bamboo')
-rw-r--r-- | nand_spl/board/amcc/bamboo/Makefile | 30 |
1 files changed, 8 insertions, 22 deletions
diff --git a/nand_spl/board/amcc/bamboo/Makefile b/nand_spl/board/amcc/bamboo/Makefile index 4063274..92b604e 100644 --- a/nand_spl/board/amcc/bamboo/Makefile +++ b/nand_spl/board/amcc/bamboo/Makefile @@ -18,8 +18,8 @@ CFLAGS += -DCONFIG_NAND_SPL SOBJS = start.o init.o resetvec.o COBJS = nand_boot.o nand_ecc.o ndfc.o sdram.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) @@ -41,43 +41,29 @@ $(nandobj)u-boot.lds: $(LDSCRIPT) # create symbolic links for common files # from cpu directory -$(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 $@ # from board directory -$(obj)init.S: +$(obj)/init.S: @rm -f $@ ln -s $(SRCTREE)/board/amcc/bamboo/init.S $@ # from nand_spl directory -$(obj)nand_boot.c: +$(obj)/nand_boot.c: @rm -f $@ ln -s $(SRCTREE)/nand_spl/nand_boot.c $@ # from drivers/mtd/nand directory -$(obj)nand_ecc.c: +$(obj)/nand_ecc.c: @rm -f $@ ln -s $(SRCTREE)/drivers/mtd/nand/nand_ecc.c $@ - -ifneq ($(OBJTREE), $(SRCTREE)) -$(obj)sdram.c: - @rm -f $@ - ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/sdram.c $@ -endif - -######################################################################### - -$(obj)%.o: $(obj)%.S - $(CC) $(AFLAGS) -c -o $@ $< - -$(obj)%.o: $(obj)%.c - $(CC) $(CFLAGS) -c -o $@ $< |