CMakeLists.txt

# Copyright (C) 2018  Christian Berger
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

cmake_minimum_required(VERSION 3.2)

project(opendlv-video-x264-encoder)

################################################################################
# Defining the relevant versions of OpenDLV Standard Message Set and libcluon.
set(OPENDLV_STANDARD_MESSAGE_SET opendlv-standard-message-set-v0.9.6.odvd)
set(CLUON_COMPLETE cluon-complete-v0.0.117.hpp)

################################################################################
# Set the search path for .cmake files.
set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}" ${CMAKE_MODULE_PATH})

################################################################################
# This project requires C++14 or newer.
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
# Build a static binary.
set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")
# Add further warning levels.
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} \
    -D_XOPEN_SOURCE=700 \
    -D_FORTIFY_SOURCE=2 \
    -O2 \
    -fstack-protector \
    -fomit-frame-pointer \
    -pipe \
    -Weffc++ \
    -Wall -Wextra -Wshadow -Wdeprecated \
    -Wdiv-by-zero -Wfloat-equal -Wfloat-conversion -Wsign-compare -Wpointer-arith \
    -Wuninitialized -Wunreachable-code \
    -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-but-set-parameter -Wunused-but-set-variable \
    -Wunused-value -Wunused-variable -Wunused-result \
    -Wmissing-field-initializers -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn")
# Threads are necessary for linking the resulting binaries as UDPReceiver is running in parallel.
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)

################################################################################
# Extract cluon-msc from cluon-complete.hpp.
add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/cluon-msc
    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
    COMMAND ${CMAKE_COMMAND} -E create_symlink ${CMAKE_CURRENT_SOURCE_DIR}/src/${CLUON_COMPLETE} ${CMAKE_BINARY_DIR}/cluon-complete.hpp
    COMMAND ${CMAKE_COMMAND} -E create_symlink ${CMAKE_BINARY_DIR}/cluon-complete.hpp ${CMAKE_BINARY_DIR}/cluon-complete.cpp
    COMMAND ${CMAKE_CXX_COMPILER} -o ${CMAKE_BINARY_DIR}/cluon-msc ${CMAKE_BINARY_DIR}/cluon-complete.cpp -std=c++14 -pthread -D HAVE_CLUON_MSC
    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/src/${CLUON_COMPLETE})

################################################################################
# Generate opendlv-standard-message-set.hpp from ${OPENDLV_STANDARD_MESSAGE_SET} file.
add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/opendlv-standard-message-set.hpp
    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
    COMMAND ${CMAKE_BINARY_DIR}/cluon-msc --cpp --out=${CMAKE_BINARY_DIR}/opendlv-standard-message-set.hpp ${CMAKE_CURRENT_SOURCE_DIR}/src/${OPENDLV_STANDARD_MESSAGE_SET}
    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/src/${OPENDLV_STANDARD_MESSAGE_SET} ${CMAKE_BINARY_DIR}/cluon-msc)
# Add current build directory as include directory as it contains generated files.
include_directories(SYSTEM ${CMAKE_BINARY_DIR})
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src)

################################################################################
# Gather all object code first to avoid double compilation.
set(LIBRARIES Threads::Threads)

if(UNIX)
    if(NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
        find_package(LibRT REQUIRED)
        set(LIBRARIES ${LIBRARIES} ${LIBRT_LIBRARIES})
        include_directories(SYSTEM ${LIBRT_INCLUDE_DIR})
    endif()
endif()

find_package(Libx264 REQUIRED)
include_directories(SYSTEM ${X264_INCLUDE_DIRS})
set(LIBRARIES ${LIBRARIES} ${X264_LIBRARIES})

################################################################################
# Create executable.
add_executable(${PROJECT_NAME} ${CMAKE_CURRENT_SOURCE_DIR}/src/${PROJECT_NAME}.cpp)
target_link_libraries(${PROJECT_NAME} ${LIBRARIES})

# Add dependency to OpenDLV Standard Message Set.
add_custom_target(generate_opendlv_standard_message_set_hpp DEPENDS ${CMAKE_BINARY_DIR}/opendlv-standard-message-set.hpp)
add_dependencies(${PROJECT_NAME} generate_opendlv_standard_message_set_hpp)

################################################################################
# Install executable.
install(TARGETS ${PROJECT_NAME} DESTINATION bin COMPONENT ${PROJECT_NAME})