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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 /scripts/Makefile.host.tmp | |
| parent | d958002589cb724907e8d4360d546403d1e6b7d8 (diff) | |
| download | u-boot-9e4140329ee9a787d0f96ac2829d618d47f7973f.tar.gz | |
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 'scripts/Makefile.host.tmp')
| -rw-r--r-- | scripts/Makefile.host.tmp | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/scripts/Makefile.host.tmp b/scripts/Makefile.host.tmp index 4b57846f4a..53fe9300be 100644 --- a/scripts/Makefile.host.tmp +++ b/scripts/Makefile.host.tmp @@ -21,11 +21,11 @@ host-objdirs += $(foreach f,$(host-cmulti), \ host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) -__hostprogs := $(addprefix $(obj),$(__hostprogs)) -host-csingle := $(addprefix $(obj),$(host-csingle)) -host-cmulti := $(addprefix $(obj),$(host-cmulti)) -host-cobjs := $(addprefix $(obj),$(host-cobjs)) -host-objdirs := $(addprefix $(obj),$(host-objdirs)) +__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) +host-csingle := $(addprefix $(obj)/,$(host-csingle)) +host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) +host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) +host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) obj-dirs += $(host-objdirs) @@ -49,13 +49,13 @@ hostc_flags = $(__hostc_flags) ##### # Compile programs on the host -$(host-csingle): $(obj)%: %.c +$(host-csingle): $(obj)/%: $(src)/%.c $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(HOSTLDFLAGS) $(HOSTCFLAGS_$(@F)) $(HOSTCFLAGS_$(BCURDIR)) -o $@ $< -$(host-cmulti): $(obj)%: $(host-cobjs) - $(HOSTCC) $(HOSTLDFLAGS) -o $@ $(addprefix $(obj),$($(@F)-objs)) $(HOSTLOADLIBES_$(@F)) +$(host-cmulti): $(obj)/%: $(host-cobjs) + $(HOSTCC) $(HOSTLDFLAGS) -o $@ $(addprefix $(obj)/,$($(@F)-objs)) $(HOSTLOADLIBES_$(@F)) -$(host-cobjs): $(obj)%.o: %.c +$(host-cobjs): $(obj)/%.o: $(src)/%.c $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS_$(@F)) $(HOSTCFLAGS_$(BCURDIR)) -o $@ $< -c targets += $(host-csingle) $(host-cmulti) $(host-cobjs) |