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| author | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2014-02-04 08:24:24 (GMT) |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2014-02-19 16:07:50 (GMT) |
| commit | 9e4140329ee9a787d0f96ac2829d618d47f7973f (patch) | |
| tree | 6a40432f6f6723ba9ac5309076af17aec3bc0a9b /board/cray/L1 | |
| parent | d958002589cb724907e8d4360d546403d1e6b7d8 (diff) | |
| download | u-boot-9e4140329ee9a787d0f96ac2829d618d47f7973f.tar.xz | |
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 $(obj)=<sub-dir>" with a shorthand.)
This means the current working directory is always the top
of the output directory.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
Diffstat (limited to 'board/cray/L1')
| -rw-r--r-- | board/cray/L1/Makefile | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/board/cray/L1/Makefile b/board/cray/L1/Makefile index 5f6c690..6aae9fa 100644 --- a/board/cray/L1/Makefile +++ b/board/cray/L1/Makefile @@ -9,8 +9,8 @@ obj-y = L1.o flash.o obj-y += init.o obj-y += bootscript.o -$(obj)bootscript.c: $(obj)bootscript.image - od -t x1 -v -A x $^ | awk -f x2c.awk > $@ +$(obj)/bootscript.c: $(obj)/bootscript.image + od -t x1 -v -A x $^ | awk -f $(srctree)/$(src)/x2c.awk > $@ -$(obj)bootscript.image: $(src)bootscript.hush $(src)Makefile - -$(OBJTREE)/tools/mkimage -A ppc -O linux -T script -C none -a 0 -e 0 -n bootscript -d $(src)bootscript.hush $@ +$(obj)/bootscript.image: $(src)/bootscript.hush + -$(OBJTREE)/tools/mkimage -A ppc -O linux -T script -C none -a 0 -e 0 -n bootscript -d $< $@ |