diff options
| author | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2014-02-04 17:24:24 +0900 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2014-02-19 11:07:50 -0500 |
| commit | 9e4140329ee9a787d0f96ac2829d618d47f7973f (patch) | |
| tree | 6a40432f6f6723ba9ac5309076af17aec3bc0a9b /common | |
| parent | d958002589cb724907e8d4360d546403d1e6b7d8 (diff) | |
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 $(obj)=<sub-dir>" with a shorthand.)
This means the current working directory is always the top
of the output directory.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
Diffstat (limited to 'common')
| -rw-r--r-- | common/Makefile | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/common/Makefile b/common/Makefile index 2fe14ccc41..2d75843628 100644 --- a/common/Makefile +++ b/common/Makefile @@ -238,11 +238,10 @@ obj-$(CONFIG_FIT_SIGNATURE) += image-sig.o obj-y += memsize.o obj-y += stdio.o -$(obj)env_embedded.o: $(src)env_embedded.c +$(obj)/env_embedded.o: $(src)/env_embedded.c $(CC) $(AFLAGS) -Wa,--no-warn \ - -DENV_CRC=$(shell $(obj)../tools/envcrc) \ - -c -o $@ $(src)env_embedded.c + -DENV_CRC=$(shell tools/envcrc) -c -o $@ $< # SEE README.arm-unaligned-accesses -$(obj)hush.o: CFLAGS += $(PLATFORM_NO_UNALIGNED) -$(obj)fdt_support.o: CFLAGS += $(PLATFORM_NO_UNALIGNED) +$(obj)/hush.o: CFLAGS += $(PLATFORM_NO_UNALIGNED) +$(obj)/fdt_support.o: CFLAGS += $(PLATFORM_NO_UNALIGNED) |