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kernel: allow linking a prebuilt library instead of compiling

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This adds a very primitive logic to allow linking a prebuilt
static library of kernel code instead of building the kernel
from source. Note that the library is built with a specific
set of kconfigs, and they must match when building applications,
or else there would be mysterious crashes.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2021-08-05 11:11:23 -07:00 • committed by Anas Nashif
commit 45f549dee9
1 changed files with 19 additions and 1 deletions
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20
kernel/CMakeLists.txt
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@ -3,6 +3,20 @@
# kernel is a normal CMake library and not a zephyr_library because it # kernel is a normal CMake library and not a zephyr_library because it
# should not be --whole-archive'd # should not be --whole-archive'd
# If a pre-built static library containing kernel code exists in
# this directory, libkernel.a, link it with the application code
# instead of building from source.
zephyr_library_get_current_dir_lib_name(${ZEPHYR_BASE} libkernel_stem)
set(libkernel ${CMAKE_CURRENT_SOURCE_DIR}/lib${libkernel_stem}${CMAKE_STATIC_LIBRARY_SUFFIX})
unset(libkernel_stem)
if(EXISTS ${libkernel})
add_library(kernel INTERFACE)
target_link_libraries(kernel INTERFACE ${libkernel})
else()
list(APPEND kernel_files list(APPEND kernel_files
banner.c banner.c
device.c device.c
@ -92,6 +106,10 @@ target_include_directories(kernel PRIVATE
${ARCH_DIR}/${ARCH}/include ${ARCH_DIR}/${ARCH}/include
) )
target_link_libraries(kernel zephyr_interface)
endif()
add_dependencies(kernel zephyr_generated_headers) add_dependencies(kernel zephyr_generated_headers)
target_link_libraries(kernel zephyr_interface) unset(libkernel)