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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 /config.mk | |
| 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 $(obj)=<sub-dir>" with a shorthand.)
This means the current working directory is always the top
of the output directory.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
Diffstat (limited to 'config.mk')
| -rw-r--r-- | config.mk | 42 |
1 files changed, 3 insertions, 39 deletions
diff --git a/config.mk b/config.mk index ed1a51972f5..0fa316743ce 100644 --- a/config.mk +++ b/config.mk @@ -6,42 +6,6 @@ # ######################################################################### -ifeq ($(CURDIR),$(SRCTREE)) -dir := -else -dir := $(subst $(SRCTREE)/,,$(CURDIR)) -endif - -ifneq ($(OBJTREE),$(SRCTREE)) -# Create object files for SPL in a separate directory -ifeq ($(CONFIG_SPL_BUILD),y) -ifeq ($(CONFIG_TPL_BUILD),y) -obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/) -else -obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) -endif -else -obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/) -endif -src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/) - -$(shell mkdir -p $(obj)) -else -# Create object files for SPL in a separate directory -ifeq ($(CONFIG_SPL_BUILD),y) -ifeq ($(CONFIG_TPL_BUILD),y) -obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/) -else -obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) - -endif -$(shell mkdir -p $(obj)) -else -obj := -endif -src := -endif - # clean the slate ... PLATFORM_RELFLAGS = PLATFORM_CPPFLAGS = @@ -52,14 +16,14 @@ PLATFORM_LDFLAGS = # Load generated board configuration ifeq ($(CONFIG_TPL_BUILD),y) # Include TPL autoconf -sinclude $(OBJTREE)/include/tpl-autoconf.mk +sinclude include/tpl-autoconf.mk else ifeq ($(CONFIG_SPL_BUILD),y) # Include SPL autoconf -sinclude $(OBJTREE)/include/spl-autoconf.mk +sinclude include/spl-autoconf.mk else # Include normal autoconf -sinclude $(OBJTREE)/include/autoconf.mk +sinclude include/autoconf.mk endif endif sinclude $(OBJTREE)/include/config.mk |