Hi there,
I'm trying to incorporate an out-of-tree kernel module alongside of a shared
library and test program into my Yocto build. The project housing the module,
library, and test needs to use Cmake.
My question: How can I make CMake aware of the target kernel source path (i.e.
${KERNEL_SRC} or ${KERNEL_STAGING_DIR} if I were using a makefile and
inheriting the modules.bbclass)?
I ask because I get build failures when I incorporate the project into Yocto
build system. Everything builds fine on the host machine outside of Yocto.
However when I try and incorporate the project into Yocto, the build fails
because the CMAKE_SYSTEM_VERSION variable (which I use to provide the path to
the kernel source) is somehow unset by the Yocto build system.
I know the CMAKE_SYSTEM_VERSION variable is erased and causing the failure from
comparing the error message (below) with my CMakeLists.txt
Yocto error message:
......
| make[3]: Entering directory
'/home/brett/Thesis/Zynq_Linux/Yocto/wslinux/build/tmp/work/zedboard_zynq7-poky-linux-gnueabi/wssha256-kmod/0.1-r0/build/modules/wssha256kern'
| make[3]: warning: jobserver unavailable: using -j1. Add '+' to parent make
rule.
| make[3]: *** /lib/modules//build: No such file or directory. Stop.
......
My CMakeLists.txt for the module is as follows:
SET( MODULE_NAME wssha256kern)
SET( MODULE_SOURCE_FILES ${MODULE_NAME}.c)
SET( MODULE_FILE ${MODULE_NAME}.ko)
SET( MODULE_OUTPUT_DIR ${CMAKE_BINARY_DIR}/modules/${MODULE_NAME})
SET( KERNEL_SRC "/lib/modules/${CMAKE_SYSTEM_VERSION}/build" ) # <----- THIS IS
WHERE THE VARIABLE IS NEEDED!!!!!
SET( KBUILD_COMMAND ${CMAKE_MAKE_PROGRAM} -C ${KERNEL_SRC}
M=${MODULE_OUTPUT_DIR} modules)
CONFIGURE_FILE( Kbuild.in ${MODULE_OUTPUT_DIR}/Kbuild)
FOREACH( MODULE_SOURCE_FILE ${MODULE_SOURCE_FILES} )
CONFIGURE_FILE(
${MODULE_SOURCE_FILE}
${MODULE_OUTPUT_DIR}/${MODULE_SOURCE_FILE}
COPYONLY
)
ENDFOREACH( MODULE_SOURCE_FILE )
ADD_CUSTOM_COMMAND(
OUTPUT ${MODULE_OUTPUT_DIR}/${MODULE_FILE}
COMMAND ${KBUILD_COMMAND}
WORKING_DIRECTORY ${MODULE_OUTPUT_DIR}
DEPENDS ${MODULE_SOURCE_FILES} Kbuild.in
VERBATIM
)
ADD_CUSTOM_TARGET(
${MODULE_NAME}
ALL
DEPENDS ${MODULE_OUTPUT_DIR}/${MODULE_FILE}
)
How can I pass the Yocto Kernel source location (for the target, not the host)
to my project's CMake?
Thanks,
Brett
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