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126 lines
4.4 KiB
126 lines
4.4 KiB
#
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# Locate and configure the gRPC library
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#
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# Adds the following targets:
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#
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# gRPC::grpc - gRPC library
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# gRPC::grpc++ - gRPC C++ library
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# gRPC::grpc++_reflection - gRPC C++ reflection library
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# gRPC::grpc_cpp_plugin - C++ generator plugin for Protocol Buffers
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#
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#
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# Generates C++ sources from the .proto files
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#
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# grpc_generate_cpp (<SRCS> <HDRS> <DEST> [<ARGN>...])
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#
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# SRCS - variable to define with autogenerated source files
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# HDRS - variable to define with autogenerated header files
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# DEST - directory where the source files will be created
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# ARGN - .proto files
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#
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function(GRPC_GENERATE_CPP SRCS HDRS DEST)
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if(NOT ARGN)
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message(SEND_ERROR "Error: GRPC_GENERATE_CPP() called without any proto files")
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return()
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endif()
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if(GRPC_GENERATE_CPP_APPEND_PATH)
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# Create an include path for each file specified
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foreach(FIL ${ARGN})
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get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
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get_filename_component(ABS_PATH ${ABS_FIL} PATH)
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list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
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if(${_contains_already} EQUAL -1)
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list(APPEND _protobuf_include_path -I ${ABS_PATH})
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endif()
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endforeach()
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else()
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set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
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endif()
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if(DEFINED PROTOBUF_IMPORT_DIRS)
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foreach(DIR ${PROTOBUF_IMPORT_DIRS})
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get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
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list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
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if(${_contains_already} EQUAL -1)
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list(APPEND _protobuf_include_path -I ${ABS_PATH})
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endif()
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endforeach()
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endif()
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set(${SRCS})
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set(${HDRS})
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foreach(FIL ${ARGN})
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get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
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get_filename_component(FIL_WE ${FIL} NAME_WE)
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list(APPEND ${SRCS} "${DEST}/${FIL_WE}.grpc.pb.cc")
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list(APPEND ${HDRS} "${DEST}/${FIL_WE}.grpc.pb.h")
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add_custom_command(
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OUTPUT "${DEST}/${FIL_WE}.grpc.pb.cc"
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"${DEST}/${FIL_WE}.grpc.pb.h"
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COMMAND protobuf::protoc
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ARGS --grpc_out ${DEST} ${_protobuf_include_path} --plugin=protoc-gen-grpc=${GRPC_CPP_PLUGIN} ${ABS_FIL}
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DEPENDS ${ABS_FIL} protobuf::protoc gRPC::grpc_cpp_plugin
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COMMENT "Running C++ gRPC compiler on ${FIL}"
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VERBATIM )
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endforeach()
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set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
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set(${SRCS} ${${SRCS}} PARENT_SCOPE)
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set(${HDRS} ${${HDRS}} PARENT_SCOPE)
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endfunction()
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# By default have GRPC_GENERATE_CPP macro pass -I to protoc
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# for each directory where a proto file is referenced.
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if(NOT DEFINED GRPC_GENERATE_CPP_APPEND_PATH)
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set(GRPC_GENERATE_CPP_APPEND_PATH TRUE)
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endif()
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# Find gRPC include directory
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find_path(GRPC_INCLUDE_DIR grpc/grpc.h)
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mark_as_advanced(GRPC_INCLUDE_DIR)
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# Find gRPC library
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find_library(GRPC_LIBRARY NAMES grpc)
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mark_as_advanced(GRPC_LIBRARY)
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add_library(gRPC::grpc UNKNOWN IMPORTED)
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set_target_properties(gRPC::grpc PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES ${GRPC_INCLUDE_DIR}
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INTERFACE_LINK_LIBRARIES "-lpthread;-ldl"
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IMPORTED_LOCATION ${GRPC_LIBRARY}
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)
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# Find gRPC C++ library
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find_library(GRPC_GRPC++_LIBRARY NAMES grpc++)
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mark_as_advanced(GRPC_GRPC++_LIBRARY)
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add_library(gRPC::grpc++ UNKNOWN IMPORTED)
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set_target_properties(gRPC::grpc++ PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES ${GRPC_INCLUDE_DIR}
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INTERFACE_LINK_LIBRARIES gRPC::grpc
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IMPORTED_LOCATION ${GRPC_GRPC++_LIBRARY}
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)
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# Find gRPC C++ reflection library
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find_library(GRPC_GRPC++_REFLECTION_LIBRARY NAMES grpc++_reflection)
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mark_as_advanced(GRPC_GRPC++_REFLECTION_LIBRARY)
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add_library(gRPC::grpc++_reflection UNKNOWN IMPORTED)
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set_target_properties(gRPC::grpc++_reflection PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES ${GRPC_INCLUDE_DIR}
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INTERFACE_LINK_LIBRARIES gRPC::grpc++
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IMPORTED_LOCATION ${GRPC_GRPC++_REFLECTION_LIBRARY}
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)
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# Find gRPC CPP generator
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find_program(GRPC_CPP_PLUGIN NAMES grpc_cpp_plugin)
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mark_as_advanced(GRPC_CPP_PLUGIN)
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add_executable(gRPC::grpc_cpp_plugin IMPORTED)
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set_target_properties(gRPC::grpc_cpp_plugin PROPERTIES
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IMPORTED_LOCATION ${GRPC_CPP_PLUGIN}
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)
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include(${CMAKE_ROOT}/Modules/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(gRPC DEFAULT_MSG
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GRPC_LIBRARY GRPC_INCLUDE_DIR GRPC_GRPC++_REFLECTION_LIBRARY GRPC_CPP_PLUGIN)
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