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| 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 /arch/blackfin/cpu/Makefile | |
| 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 $(obj)=<sub-dir>" with a shorthand.)
This means the current working directory is always the top
of the output directory.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
Diffstat (limited to 'arch/blackfin/cpu/Makefile')
| -rw-r--r-- | arch/blackfin/cpu/Makefile | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/blackfin/cpu/Makefile b/arch/blackfin/cpu/Makefile index a61594a..369dc74 100644 --- a/arch/blackfin/cpu/Makefile +++ b/arch/blackfin/cpu/Makefile @@ -25,9 +25,9 @@ extra-y += check_initcode # make sure our initcode (which goes into LDR) does not # have relocs or external references -$(obj)initcode.o: CFLAGS += -fno-function-sections -fno-data-sections +$(obj)/initcode.o: CFLAGS += -fno-function-sections -fno-data-sections READINIT = env LC_ALL=C $(CROSS_COMPILE)readelf -s $< -$(obj)check_initcode: $(obj)initcode.o +$(obj)/check_initcode: $(obj)/initcode.o ifneq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_BYPASS) @if $(READINIT) | grep '\<GLOBAL\>.*\<UND\>' ; then \ echo "$< contains external references!" 1>&2 ; \ @@ -35,7 +35,7 @@ ifneq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_BYPASS) fi endif -$(obj)init.lds: init.lds.S +$(obj)/init.lds: $(src)/init.lds.S $(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P $^ -o $@ -$(obj)init.elf: $(obj)init.lds $(obj)init.o $(obj)initcode.o +$(obj)/init.elf: $(obj)/init.lds $(obj)/init.o $(obj)/initcode.o $(LD) $(LDFLAGS) -T $^ -o $@ |