cmake/CompileProto.cmake

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

function(compile_proto OUT_HDRS OUT_SRCS DESTDIR HDR_OUTPUT_DIR PROTO_DIR PROTO_FILES)
  foreach(P ${PROTO_FILES})
    string(REPLACE .proto .pb.h HDR ${P})
    set(HDR_RELATIVE ${HDR})
    set(HDR ${DESTDIR}/${HDR})
    string(REPLACE .proto .pb.cc SRC ${P})
    set(SRC ${DESTDIR}/${SRC})
    list(APPEND HDRS ${HDR})
    list(APPEND SRCS ${SRC})
    add_custom_command(
      OUTPUT ${HDR} ${SRC}
      COMMAND ${PROTOBUF_PROTOC_EXECUTABLE} ${PROTOC_FLAGS} -I${PROTO_DIR} --cpp_out=${DESTDIR} ${PROTO_DIR}/${P}
      COMMAND ${CMAKE_COMMAND} -E copy ${HDR} ${HDR_OUTPUT_DIR}/${HDR_RELATIVE}
      DEPENDS ${PROTO_DIR}/${P}
    )
  endforeach()
  set(${OUT_HDRS} ${HDRS} PARENT_SCOPE)
  set(${OUT_SRCS} ${SRCS} PARENT_SCOPE)
endfunction()