Hello,
I have a question regarding building of out-of-tree kernel modules in
separate build directory.
I have a source tree containing two out-of-tree kernel modules which is spread
in two directories, module1 and module2. The build produces two independent
modules: module1.ko and module2.ko.
$ tree --charset=ascii
.
|-- Kbuild
|-- module1
| |-- Kbuild
| `-- task1.c
`-- module2
|-- Kbuild
`-- task2.c
The root Kbuild points on sub-directories where the actual modules are located:
$ cat Kbuild
obj-y += module1/
obj-y += module2/
I want to use a dedicated build directory, so I could build the same set of
sources for different platforms (ARM and x86).
It looks like passing O= or KBUILD_OUTPUT= doesn't work for out of tree modules.
So, I've tried passing 'src' directory directly to the make command, but that
seems to cause a run-away recursion in the Kbuild:
make V=1 -C $(KDIR) M=`pwd`/build_x86 src=`pwd`
make: Entering directory '/home/lexa/linux_build'
make -C /home/lexa/linux O=/home/lexa/linux_build/.
make -C /home/lexa/linux_build KBUILD_SRC=/home/lexa/linux \
-f /home/lexa/linux/Makefile
test -e include/generated/autoconf.h -a -e include/config/auto.conf || ( \
echo >&2; \
echo >&2 " ERROR: Kernel configuration is invalid."; \
echo >&2 " include/generated/autoconf.h or
include/config/auto.conf are missing.";\
echo >&2 " Run 'make oldconfig && make prepare' on kernel src
to fix it."; \
echo >&2 ; \
/bin/false)
mkdir -p /home/lexa/module/build_arm/.tmp_versions ; rm -f
/home/lexa/module/build_arm/.tmp_versions/*
make -f /home/lexa/linux/scripts/Makefile.build obj=/home/lexa/module/build_arm
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1/module1/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1/module1/module1/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1/module1/module1/module1/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1/module1/module1/module1/module1/module1/module1
make -f /home/lexa/linux/scripts/Makefile.build
obj=/home/lexa/module/build_arm/module1/module1/module1/module1/module1/module1/module1/module1/module1/module1
... and this goes on ...
It looks like this happen because in 'src' from command line overrides the 'src'
assignment in scripts/Makefile.modbuiltin:5 and then it is not handled when
descending the source tree in scripts/Makefile.modbuiltin:53
I was wondering, what is the right way to build the module with separate build
directory?
--
Kind Regards,
Aleksei
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