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kbuild: change out-of-tree build

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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>
This commit is contained in:
Masahiro Yamada
2014-02-04 17:24:24 +09:00
committed by Tom Rini
parent d958002589
commit 9e4140329e
64 changed files with 611 additions and 743 deletions
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42
config.mk
View File

@@ -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