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      1 # Copyright 2014 Stefan.Eilemann (a] epfl.ch
      2 # Copyright 2014 Google Inc. All rights reserved.
      3 #
      4 # Licensed under the Apache License, Version 2.0 (the "License");
      5 # you may not use this file except in compliance with the License.
      6 # You may obtain a copy of the License at
      7 #
      8 #     http://www.apache.org/licenses/LICENSE-2.0
      9 #
     10 # Unless required by applicable law or agreed to in writing, software
     11 # distributed under the License is distributed on an "AS IS" BASIS,
     12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13 # See the License for the specific language governing permissions and
     14 # limitations under the License.
     15 
     16 # Find the flatbuffers schema compiler
     17 #
     18 # Output Variables:
     19 # * FLATBUFFERS_FLATC_EXECUTABLE the flatc compiler executable
     20 # * FLATBUFFERS_FOUND
     21 #
     22 # Provides:
     23 # * FLATBUFFERS_GENERATE_C_HEADERS(Name <files>) creates the C++ headers
     24 #   for the given flatbuffer schema files.
     25 #   Returns the header files in ${Name}_OUTPUTS
     26 
     27 set(FLATBUFFERS_CMAKE_DIR ${CMAKE_CURRENT_LIST_DIR})
     28 
     29 find_program(FLATBUFFERS_FLATC_EXECUTABLE NAMES flatc)
     30 find_path(FLATBUFFERS_INCLUDE_DIR NAMES flatbuffers/flatbuffers.h)
     31 
     32 include(FindPackageHandleStandardArgs)
     33 find_package_handle_standard_args(flatbuffers
     34   DEFAULT_MSG FLATBUFFERS_FLATC_EXECUTABLE FLATBUFFERS_INCLUDE_DIR)
     35 
     36 if(FLATBUFFERS_FOUND)
     37   function(FLATBUFFERS_GENERATE_C_HEADERS Name)
     38     set(FLATC_OUTPUTS)
     39     foreach(FILE ${ARGN})
     40       get_filename_component(FLATC_OUTPUT ${FILE} NAME_WE)
     41       set(FLATC_OUTPUT
     42         "${CMAKE_CURRENT_BINARY_DIR}/${FLATC_OUTPUT}_generated.h")
     43       list(APPEND FLATC_OUTPUTS ${FLATC_OUTPUT})
     44 
     45       add_custom_command(OUTPUT ${FLATC_OUTPUT}
     46         COMMAND ${FLATBUFFERS_FLATC_EXECUTABLE}
     47         ARGS -c -o "${CMAKE_CURRENT_BINARY_DIR}/" ${FILE}
     48         COMMENT "Building C++ header for ${FILE}"
     49         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
     50     endforeach()
     51     set(${Name}_OUTPUTS ${FLATC_OUTPUTS} PARENT_SCOPE)
     52   endfunction()
     53 
     54   set(FLATBUFFERS_INCLUDE_DIRS ${FLATBUFFERS_INCLUDE_DIR})
     55   include_directories(${CMAKE_BINARY_DIR})
     56 else()
     57   set(FLATBUFFERS_INCLUDE_DIR)
     58 endif()
     59 
     60 include("${FLATBUFFERS_CMAKE_DIR}/BuildFlatBuffers.cmake")