src.dualinventive.com/fw/libdi_fw-tests/libdi_fw/common/cmake/MergeStaticLibs.txt

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# merge libs into a single static library
function(merge_static_libs outlib )
set(libs ${ARGV})
list(REMOVE_AT libs 0)
set(objdir ${CMAKE_CURRENT_BINARY_DIR}/tmpobj)
file(MAKE_DIRECTORY ${objdir})
set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/${outlib}_dummy.c)
if(NOT EXISTS ${dummyfile})
file(WRITE ${dummyfile} "const char *dummy = \"${dummyfile}\";")
endif()
set_source_files_properties("${dummyfile}" PROPERTIES COMPILE_FLAGS -Wno-missing-variable-declarations)
add_library(${outlib} STATIC ${dummyfile})
set(outfile $<TARGET_FILE:${outlib}>)
foreach(lib ${libs})
add_custom_command(TARGET ${outlib} POST_BUILD
DEPENDS ${lib}
COMMAND ${CMAKE_COMMAND} -E echo "AR x ${lib}"
COMMAND ${CMAKE_AR} x $<TARGET_FILE:${lib}>
WORKING_DIRECTORY ${objdir})
endforeach()
add_custom_command(TARGET ${outlib} POST_BUILD
DEPENDS ${lib}
COMMAND ${CMAKE_COMMAND} -E echo "AR ru ${outlib} tmpobj/*.o"
COMMAND ${CMAKE_AR} ru "${outfile}" "${objdir}/*.o"
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
endfunction()