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function(_FlatBuffers_import)
find_package(Flatbuffers QUIET)
set(FlatBuffers_FOUND ${Flatbuffers_FOUND} PARENT_SCOPE)
endfunction(_FlatBuffers_import)
function(_FlatBuffers_build)
if(NOT BUILD_FLATBUFFERS)
return()
endif(NOT BUILD_FLATBUFFERS)
nncc_find_package(FlatBuffersSource EXACT 1.10 QUIET)
if(NOT FlatBuffersSource_FOUND)
# Source is not available
return()
endif(NOT FlatBuffersSource_FOUND)
# TODO Introduce helper functions
set(FLATBUFFERS_BUILD "${CMAKE_BINARY_DIR}/externals/FLATBUFFERS/build")
set(FLATBUFFERS_INSTALL "${NNCC_OVERLAY_DIR}")
set(STAMP_PATH "${FLATBUFFERS_INSTALL}/FLATBUFFERS.stamp")
set(LOG_PATH "${FLATBUFFERS_INSTALL}/FLATBUFFERS.log")
if(EXISTS ${STAMP_PATH})
return()
endif(EXISTS ${STAMP_PATH})
message(STATUS "Build Flatbuffers from ${FlatBuffersSource_DIR}")
file(MAKE_DIRECTORY ${FLATBUFFERS_BUILD})
file(MAKE_DIRECTORY ${FLATBUFFERS_INSTALL})
# NOTE Do NOT retry Flatbuffers build once it fails
file(WRITE "${STAMP_PATH}")
execute_process(COMMAND ${CMAKE_COMMAND}
-DCMAKE_INSTALL_PREFIX=${FLATBUFFERS_INSTALL}
-DCMAKE_BUILD_TYPE=Release
${FlatBuffersSource_DIR}
OUTPUT_FILE ${LOG_PATH}
ERROR_FILE ${LOG_PATH}
WORKING_DIRECTORY ${FLATBUFFERS_BUILD}
RESULT_VARIABLE BUILD_EXITCODE)
execute_process(COMMAND ${CMAKE_COMMAND} --build . -- install
OUTPUT_FILE ${LOG_PATH}
ERROR_FILE ${LOG_PATH}
WORKING_DIRECTORY ${FLATBUFFERS_BUILD}
RESULT_VARIABLE INSTALL_EXITCODE)
if(BUILD_EXITCODE EQUAL 0 AND INSTALL_EXITCODE EQUAL 0)
message(STATUS "Succeeded in building Flatbuffers")
else()
message(FATAL_ERROR "Fail to build Flatbuffers (check '${LOG_PATH}' for details)")
endif(BUILD_EXITCODE EQUAL 0 AND INSTALL_EXITCODE EQUAL 0)
endfunction(_FlatBuffers_build)
_FlatBuffers_build()
_FlatBuffers_import()
if(FlatBuffers_FOUND)
if(NOT TARGET flatbuffers)
add_library(flatbuffers INTERFACE)
target_link_libraries(flatbuffers INTERFACE flatbuffers::flatbuffers)
message(STATUS "Found FlatBuffers: TRUE")
endif(NOT TARGET flatbuffers)
function(FlatBuffers_Generate PREFIX OUTPUT_DIR SCHEMA_DIR)
get_filename_component(abs_output_dir ${OUTPUT_DIR} ABSOLUTE)
get_filename_component(abs_schema_dir ${SCHEMA_DIR} ABSOLUTE)
foreach(schema ${ARGN})
get_filename_component(schema_fn "${schema}" NAME)
get_filename_component(dir "${schema}" DIRECTORY)
get_filename_component(schema_fn_we "${schema_fn}" NAME_WE)
list(APPEND SCHEMA_FILES "${abs_schema_dir}/${schema}")
list(APPEND OUTPUT_FILES "${abs_output_dir}/${schema_fn_we}_generated.h")
endforeach()
add_custom_command(OUTPUT ${OUTPUT_FILES}
COMMAND ${CMAKE_COMMAND} -E make_directory "${abs_output_dir}"
COMMAND "$<TARGET_FILE:flatbuffers::flatc>" -c --no-includes
--no-union-value-namespacing
--gen-object-api -o "${abs_output_dir}"
${SCHEMA_FILES}
DEPENDS flatbuffers::flatc)
set(${PREFIX}_SOURCES ${OUTPUT_FILES} PARENT_SCOPE)
set(${PREFIX}_INCLUDE_DIRS ${abs_output_dir} PARENT_SCOPE)
endfunction(FlatBuffers_Generate)
function(FlatBuffers_Target TGT)
set(oneValueArgs OUTPUT_DIR SCHEMA_DIR)
set(multiValueArgs SCHEMA_FILES)
cmake_parse_arguments(ARG "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
get_filename_component(abs_output_dir ${ARG_OUTPUT_DIR} ABSOLUTE)
get_filename_component(abs_schema_dir ${ARG_SCHEMA_DIR} ABSOLUTE)
# Let's reset list variables before using them
# NOTE THIS DOES NOT AFFECT parent scope
unset(SCHEMA_FILES)
unset(OUTPUT_FILES)
foreach(schema ${ARG_SCHEMA_FILES})
get_filename_component(schema_fn "${schema}" NAME)
get_filename_component(dir "${schema}" DIRECTORY)
get_filename_component(schema_fn_we "${schema_fn}" NAME_WE)
list(APPEND SCHEMA_FILES "${abs_schema_dir}/${schema}")
list(APPEND OUTPUT_FILES "${abs_output_dir}/${schema_fn_we}_generated.h")
endforeach()
# Generate headers
add_custom_command(OUTPUT ${OUTPUT_FILES}
COMMAND ${CMAKE_COMMAND} -E make_directory "${abs_output_dir}"
COMMAND "$<TARGET_FILE:flatbuffers::flatc>" -c --no-includes
--no-union-value-namespacing
--gen-object-api -o "${abs_output_dir}"
${SCHEMA_FILES}
DEPENDS ${SCHEMA_FILES}
COMMENT "Generate '${TGT}' headers")
# NOTE This header-only library is deliberately declared as STATIC library
# to avoid possible scope issues related with generated files
add_library(${TGT} STATIC ${OUTPUT_FILES})
set_target_properties(${TGT} PROPERTIES LINKER_LANGUAGE CXX)
target_include_directories(${TGT} PUBLIC "${ARG_OUTPUT_DIR}")
target_link_libraries(${TGT} PUBLIC flatbuffers)
endfunction(FlatBuffers_Target)
endif(FlatBuffers_FOUND)
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