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# NOTE This function is unused, but remains for future reference
function(_Protobuf_module_import)
# Let's use find_package here not to export unnecessary definitions
find_package(Protobuf MODULE QUIET)
if(NOT PROTOBUF_FOUND)
set(Protobuf_FOUND FALSE PARENT_SCOPE)
return()
endif(NOT PROTOBUF_FOUND)
if(NOT TARGET protoc)
add_executable(protoc IMPORTED)
set_target_properties(protoc PROPERTIES IMPORTED_LOCATION ${PROTOBUF_PROTOC_EXECUTABLE})
endif(NOT TARGET protoc)
if(NOT TARGET libprotobuf)
add_library(libprotobuf INTERFACE)
target_include_directories(libprotobuf INTERFACE ${PROTOBUF_INCLUDE_DIRS})
target_link_libraries(libprotobuf INTERFACE ${PROTOBUF_LIBRARIES})
endif(NOT TARGET libprotobuf)
set(Protobuf_FOUND TRUE PARENT_SCOPE)
endfunction(_Protobuf_module_import)
function(_Protobuf_import)
# Let's use find_package here not to export unnecessary definitions
# NOTE Here we use "exact" match to avoid possible infinite loop
find_package(protobuf EXACT 3.5.2 QUIET)
if(NOT protobuf_FOUND)
set(Protobuf_FOUND FALSE PARENT_SCOPE)
return()
endif(NOT protobuf_FOUND)
if(NOT TARGET libprotobuf)
add_library(libprotobuf INTERFACE)
target_link_libraries(libprotobuf INTERFACE protobuf::libprotobuf)
endif(NOT TARGET libprotobuf)
set(Protobuf_FOUND TRUE PARENT_SCOPE)
endfunction(_Protobuf_import)
function(_Protobuf_build)
if(NOT BUILD_PROTOBUF)
return()
endif(NOT BUILD_PROTOBUF)
nncc_find_package(ProtobufSource QUIET)
if(NOT ProtobufSource_FOUND)
# Source is not available
return()
endif(NOT ProtobufSource_FOUND)
# TODO Introduce helper functions
set(PROTOBUF_BUILD_DIR "${CMAKE_BINARY_DIR}/externals/PROTOBUF/build")
set(PROTOBUF_INSTALL_DIR "${NNCC_OVERLAY_DIR}")
set(STAMP_PATH "${PROTOBUF_INSTALL_DIR}/PROTOBUF.stamp")
set(LOG_PATH "${PROTOBUF_INSTALL_DIR}/PROTOBUF.log")
if(EXISTS ${STAMP_PATH})
return()
endif(EXISTS ${STAMP_PATH})
message(STATUS "Build Protocol Buffer from ${ProtobufSource_DIR}")
file(MAKE_DIRECTORY ${PROTOBUF_BUILD_DIR})
file(MAKE_DIRECTORY ${PROTOBUF_INSTALL_DIR})
# NOTE Do NOT retry Protocol Buffer build
file(WRITE "${STAMP_PATH}")
execute_process(COMMAND ${CMAKE_COMMAND}
-DCMAKE_INSTALL_PREFIX=${PROTOBUF_INSTALL_DIR}
-DCMAKE_BUILD_TYPE=Release
-DCMAKE_CXX_FLAGS="-fPIC"
-Dprotobuf_BUILD_TESTS=OFF
-Dprotobuf_WITH_ZLIB=OFF
"${ProtobufSource_DIR}/cmake"
OUTPUT_FILE ${LOG_PATH}
ERROR_FILE ${LOG_PATH}
WORKING_DIRECTORY ${PROTOBUF_BUILD_DIR}
RESULT_VARIABLE CONFIGURE_EXITCODE)
if(NOT CONFIGURE_EXITCODE EQUAL 0)
message(FATAL_ERROR "Fail to configure Protocol Buffer (check '${LOG_PATH}' for details)")
endif(NOT CONFIGURE_EXITCODE EQUAL 0)
execute_process(COMMAND ${CMAKE_COMMAND} --build . -- install
OUTPUT_FILE ${LOG_PATH}
ERROR_FILE ${LOG_PATH}
WORKING_DIRECTORY ${PROTOBUF_BUILD_DIR}
RESULT_VARIABLE BUILD_AND_INSTALL_EXITCODE)
if(NOT BUILD_AND_INSTALL_EXITCODE EQUAL 0)
message(FATAL_ERROR "Fail to build/install Protocol Buffer (check '${LOG_PATH}' for details)")
endif(NOT BUILD_AND_INSTALL_EXITCODE EQUAL 0)
message(STATUS "Succeeded in building Protocol Buffer")
endfunction(_Protobuf_build)
_Protobuf_build()
_Protobuf_import()
if(Protobuf_FOUND)
function(Protobuf_Generate PREFIX OUTPUT_DIR PROTO_DIR)
get_filename_component(abs_output_dir ${OUTPUT_DIR} ABSOLUTE)
get_filename_component(abs_proto_dir ${PROTO_DIR} ABSOLUTE)
# Let's reset variables before using them
# NOTE This DOES NOT AFFECT variables in the parent scope
unset(PROTO_FILES)
unset(OUTPUT_FILES)
foreach(proto ${ARGN})
get_filename_component(fil "${proto}" NAME)
get_filename_component(dir "${proto}" DIRECTORY)
get_filename_component(fil_we "${fil}" NAME_WE)
get_filename_component(abs_fil "${abs_proto_base}/${proto}" ABSOLUTE)
get_filename_component(abs_dir "${abs_fil}" DIRECTORY)
list(APPEND PROTO_FILES "${abs_proto_dir}/${proto}")
list(APPEND OUTPUT_FILES "${abs_output_dir}/${dir}/${fil_we}.pb.h")
list(APPEND OUTPUT_FILES "${abs_output_dir}/${dir}/${fil_we}.pb.cc")
endforeach()
add_custom_command(OUTPUT ${OUTPUT_FILES}
COMMAND ${CMAKE_COMMAND} -E make_directory "${abs_output_dir}"
COMMAND "$<TARGET_FILE:protobuf::protoc>" --cpp_out "${abs_output_dir}" -I "${abs_proto_dir}" ${PROTO_FILES}
DEPENDS ${PROTO_FILES})
set(${PREFIX}_SOURCES ${OUTPUT_FILES} PARENT_SCOPE)
set(${PREFIX}_INCLUDE_DIRS ${abs_output_dir} PARENT_SCOPE)
set(${PREFIX}_LIBRARIES protobuf::libprotobuf PARENT_SCOPE)
endfunction(Protobuf_Generate)
endif(Protobuf_FOUND)
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