CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

project(FlatBuffers)

# NOTE: Code coverage only works on Linux & OSX.
option(FLATBUFFERS_CODE_COVERAGE "Enable the code coverage build option." OFF)
option(FLATBUFFERS_BUILD_TESTS "Enable the build of tests and samples." ON)
option(FLATBUFFERS_INSTALL "Enable the installation of targets." ON)
option(FLATBUFFERS_BUILD_FLATLIB "Enable the build of the flatbuffers library" ON)
option(FLATBUFFERS_BUILD_FLATC "Enable the build of the flatbuffers compiler" ON)
option(FLATBUFFERS_BUILD_FLATHASH "Enable the build of flathash" ON)

if(NOT FLATBUFFERS_BUILD_FLATC AND FLATBUFFERS_BUILD_TESTS)
    message(WARNING
    "Cannot build tests without building the compiler. Tests will be disabled.")
    set(FLATBUFFERS_BUILD_TESTS OFF)
endif()

set(FlatBuffers_Library_SRCS
  include/flatbuffers/flatbuffers.h
  include/flatbuffers/hash.h
  include/flatbuffers/idl.h
  include/flatbuffers/util.h
  include/flatbuffers/reflection.h
  include/flatbuffers/reflection_generated.h
  src/idl_parser.cpp
  src/idl_gen_text.cpp
  src/reflection.cpp
)

set(FlatBuffers_Compiler_SRCS
  ${FlatBuffers_Library_SRCS}
  src/idl_gen_cpp.cpp
  src/idl_gen_general.cpp
  src/idl_gen_go.cpp
  src/idl_gen_js.cpp
  src/idl_gen_python.cpp
  src/idl_gen_fbs.cpp
  src/flatc.cpp
)

set(FlatHash_SRCS
  include/flatbuffers/hash.h
  src/flathash.cpp
)

set(FlatBuffers_Tests_SRCS
  ${FlatBuffers_Library_SRCS}
  src/idl_gen_fbs.cpp
  src/idl_gen_general.cpp
  tests/test.cpp
  # file generate by running compiler on tests/monster_test.fbs
  ${CMAKE_CURRENT_BINARY_DIR}/tests/monster_test_generated.h
)

set(FlatBuffers_Sample_Binary_SRCS
  include/flatbuffers/flatbuffers.h
  samples/sample_binary.cpp
  # file generated by running compiler on samples/monster.fbs
  ${CMAKE_CURRENT_BINARY_DIR}/samples/monster_generated.h
)

set(FlatBuffers_Sample_Text_SRCS
  include/flatbuffers/flatbuffers.h
  include/flatbuffers/hash.h
  include/flatbuffers/idl.h
  include/flatbuffers/util.h
  src/idl_parser.cpp
  src/idl_gen_text.cpp
  samples/sample_text.cpp
  # file generated by running compiler on samples/monster.fbs
  ${CMAKE_CURRENT_BINARY_DIR}/samples/monster_generated.h
)

# source_group(Compiler FILES ${FlatBuffers_Compiler_SRCS})
# source_group(Tests FILES ${FlatBuffers_Tests_SRCS})

if(APPLE)
  set(CMAKE_CXX_FLAGS
    "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++ -Wall -pedantic -Werror -Wextra")
elseif(CMAKE_COMPILER_IS_GNUCXX)
  set(CMAKE_CXX_FLAGS
    "${CMAKE_CXX_FLAGS} -std=c++0x -Wall -pedantic -Werror -Wextra")
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
  set(CMAKE_CXX_FLAGS
    "${CMAKE_CXX_FLAGS} -std=c++0x -stdlib=libc++ -Wall -pedantic -Werror -Wextra")
endif()

if(FLATBUFFERS_CODE_COVERAGE)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fprofile-arcs -ftest-coverage")
  set(CMAKE_EXE_LINKER_FLAGS
      "${CMAKE_EXE_LINKER_FLAGS} -fprofile-arcs -ftest-coverage")
endif()

if(BIICODE)
  include(biicode/cmake/biicode.cmake)
  return()
endif()

include_directories(include)

if(FLATBUFFERS_BUILD_FLATLIB)
add_library(flatbuffers STATIC ${FlatBuffers_Library_SRCS})
endif()

if(FLATBUFFERS_BUILD_FLATC)
  add_executable(flatc ${FlatBuffers_Compiler_SRCS})
endif()

if(FLATBUFFERS_BUILD_FLATHASH)
  add_executable(flathash ${FlatHash_SRCS})
endif()

function(compile_flatbuffers_schema_to_cpp SRC_FBS)
  get_filename_component(SRC_FBS_DIR ${SRC_FBS} PATH)
  string(REGEX REPLACE "\\.fbs$" "_generated.h" GEN_HEADER ${SRC_FBS})
  add_custom_command(
    OUTPUT ${GEN_HEADER}
    COMMAND flatc -c --no-includes --gen-mutable -o "${SRC_FBS_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/${SRC_FBS}"
    DEPENDS flatc)
endfunction()

function(compile_flatbuffers_schema_to_binary SRC_FBS)
  get_filename_component(SRC_FBS_DIR ${SRC_FBS} PATH)
  string(REGEX REPLACE "\\.fbs$" ".bfbs" GEN_BINARY_SCHEMA ${SRC_FBS})
  add_custom_command(
    OUTPUT ${GEN_BINARY_SCHEMA}
    COMMAND flatc -b --schema -o "${SRC_FBS_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/${SRC_FBS}"
    DEPENDS flatc)
endfunction()

# General function to create FlatBuffer build rules for the given list of
# schemas.
#
# flatbuffers_schemas: A list of flatbuffer schema files to process.
#
# schema_include_dirs: A list of schema file include directories, which will be
# passed to flatc via the -I parameter.
#
# custom_target_name: The generated files will be added as dependencies for a
# new custom target with this name. You should add that target as a dependency
# for your main target to ensure these files are built. You can also retrieve
# various properties from this target, such as GENERATED_INCLUDES_DIR,
# BINARY_SCHEMAS_DIR, and COPY_TEXT_SCHEMAS_DIR.
#
# additional_dependencies: A list of additional dependencies that you'd like
# all generated files to depend on. Pass in a blank string if you have none.
#
# generated_includes_dir: Where to generate the C++ header files for these
# schemas. The generated includes directory will automatically be added to
# CMake's include directories, and will be where generated header files are
# placed. This parameter is optional; pass in empty string if you don't want to
# generate include files for these schemas.
#
# binary_schemas_dir: If you specify an optional binary schema directory, binary
# schemas will be generated for these schemas as well, and placed into the given
# directory.
#
# copy_text_schemas_dir: If you want all text schemas (including schemas from
# all schema include directories) copied into a directory (for example, if you
# need them within your project to build JSON files), you can specify that
# folder here. All text schemas will be copied to that folder.
#
# IMPORTANT: Make sure you quote all list arguments you pass to this function!
# Otherwise CMake will only pass in the first element.
# Example: build_flatbuffers("${fb_files}" "${include_dirs}" target_name ...)
function(build_flatbuffers flatbuffers_schemas
                           schema_include_dirs
                           custom_target_name
                           additional_dependencies
                           generated_includes_dir
                           binary_schemas_dir
                           copy_text_schemas_dir)
  set(schema_glob "*.fbs")
  # Generate the include files parameters.
  set(include_params "")
  set(all_generated_files "")
  foreach (include_dir ${schema_include_dirs})
    set(include_params -I ${include_dir} ${include_params})
    if (NOT ${copy_text_schemas_dir} STREQUAL "")
      # Copy text schemas from dependent folders.
      file(GLOB_RECURSE dependent_schemas ${include_dir}/${schema_glob})
      foreach (dependent_schema ${dependent_schemas})
        file(COPY ${dependent_schema} DESTINATION ${copy_text_schemas_dir})
      endforeach()
    endif()
  endforeach()

  foreach(schema ${flatbuffers_schemas})
    get_filename_component(filename ${schema} NAME_WE)
    # For each schema, do the things we requested.
    if (NOT ${generated_includes_dir} STREQUAL "")
      set(generated_include ${generated_includes_dir}/${filename}_generated.h)
      add_custom_command(
        OUTPUT ${generated_include}
        COMMAND flatc --gen-mutable
        -o ${generated_includes_dir}
        ${include_params}
        -c ${schema}
        DEPENDS flatc ${schema} ${additional_dependencies})
      list(APPEND all_generated_files ${generated_include})
    endif()

    if (NOT ${binary_schemas_dir} STREQUAL "")
      set(binary_schema ${binary_schemas_dir}/${filename}.bfbs)
      add_custom_command(
        OUTPUT ${binary_schema}
        COMMAND flatc -b --schema
        -o ${binary_schemas_dir}
        ${include_params}
        ${schema}
        DEPENDS flatc ${schema} ${additional_dependencies})
      list(APPEND all_generated_files ${binary_schema})
    endif()

    if (NOT ${copy_text_schemas_dir} STREQUAL "")
      file(COPY ${schema} DESTINATION ${copy_text_schemas_dir})
    endif()
  endforeach()

  # Create a custom target that depends on all the generated files.
  # This is the target that you can depend on to trigger all these
  # to be built.
  add_custom_target(${custom_target_name}
                    DEPENDS ${all_generated_files} ${additional_dependencies})

  # Register the include directory we are using.
  if (NOT ${generated_includes_dir} STREQUAL "")
    include_directories(${generated_includes_dir})
    set_property(TARGET ${custom_target_name}
      PROPERTY GENERATED_INCLUDES_DIR
      ${generated_includes_dir})
  endif()

  # Register the binary schemas dir we are using.
  if (NOT ${binary_schemas_dir} STREQUAL "")
    set_property(TARGET ${custom_target_name}
      PROPERTY BINARY_SCHEMAS_DIR
      ${binary_schemas_dir})
  endif()

  # Register the text schema copy dir we are using.
  if (NOT ${copy_text_schemas_dir} STREQUAL "")
    set_property(TARGET ${custom_target_name}
      PROPERTY COPY_TEXT_SCHEMAS_DIR
      ${copy_text_schemas_dir})
  endif()
endfunction()

if(FLATBUFFERS_BUILD_TESTS)
  compile_flatbuffers_schema_to_cpp(tests/monster_test.fbs)
  include_directories(${CMAKE_CURRENT_BINARY_DIR}/tests)
  add_executable(flattests ${FlatBuffers_Tests_SRCS})

  compile_flatbuffers_schema_to_cpp(samples/monster.fbs)
  include_directories(${CMAKE_CURRENT_BINARY_DIR}/samples)
  add_executable(flatsamplebinary ${FlatBuffers_Sample_Binary_SRCS})
  add_executable(flatsampletext ${FlatBuffers_Sample_Text_SRCS})
endif()

if(FLATBUFFERS_INSTALL)
  install(DIRECTORY include/flatbuffers DESTINATION include)
  if(FLATBUFFERS_BUILD_FLATLIB)
    install(TARGETS flatbuffers DESTINATION lib)
  endif()
  if(FLATBUFFERS_BUILD_FLATC)
    install(TARGETS flatc DESTINATION bin)
  endif()
endif()

if(FLATBUFFERS_BUILD_TESTS)
  enable_testing()

  file(COPY "${CMAKE_CURRENT_SOURCE_DIR}/tests" DESTINATION
       "${CMAKE_CURRENT_BINARY_DIR}")
  add_test(NAME flattests COMMAND flattests)
endif()