CMakeLists.txt

# 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.

cmake_minimum_required (VERSION 3.14)
cmake_policy(SET CMP0012 NEW)
cmake_policy(SET CMP0042 NEW)
cmake_policy(SET CMP0068 NEW)

project(Celix C CXX)

include(cmake/celix_project/CelixProject.cmake)
include(cmake/cmake_celix/UseCelix.cmake)

#find required packages
find_package(ZLIB REQUIRED) #framework
find_package(libuuid REQUIRED) #framework
find_package(CURL REQUIRED) #framework, etcdlib
find_package(libzip REQUIRED) #framework, etcdlib
find_package(jansson REQUIRED) #etcdlib, dfi
find_package(libffi REQUIRED) #dfi
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)

if (NOT TARGET ZLIB::ZLIB)
    #Note more recent zlib will create ZLIB::ZLIB target
    message("Note ZLIB::ZLIB target not created by find_package(ZLIB). Creating ZLIB::ZLIB Target.")
    add_library(ZLIB::ZLIB SHARED IMPORTED)
    set_target_properties(ZLIB::ZLIB PROPERTIES
            IMPORTED_LOCATION "${ZLIB_LIBRARIES}"
            INTERFACE_INCLUDE_DIRECTORIES "${ZLIB_INCLUDE_DIRS}"
            )
endif ()

if (NOT TARGET CURL::libcurl)
    #Note more recent curl will create CURL::libcurl target
    message("Note CURL::libcurl target not created by find_package(CURL). Creating CURL::libcurl Target.")
    add_library(CURL::libcurl SHARED IMPORTED)
    set_target_properties(CURL::libcurl PROPERTIES
            IMPORTED_LOCATION "${CURL_LIBRARIES}"
            INTERFACE_INCLUDE_DIRECTORIES "${CURL_INCLUDE_DIRS}"
            )
endif ()

if (NOT TARGET jansson::jansson)
    message("Note jansson::jansson target not created by find_package(jansson). Creating jansson::jansson Target.")
    add_library(jansson::jansson SHARED IMPORTED)
    set_target_properties(jansson::jansson PROPERTIES
            IMPORTED_LOCATION "${JANSSON_LIBRARIES}"
            INTERFACE_INCLUDE_DIRECTORIES "${JANSSON_INCLUDE_DIRS}"
            )
endif ()

# see https://public.kitware.com/Bug/view.php?id=15696
IF (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} EQUAL 3.3 AND ${CMAKE_GENERATOR} STREQUAL "Unix Makefiles")
    message( FATAL_ERROR "Building Celix using CMake 3.3 and makefiles is not supported due to a bug in the Makefile Generator (see Bug 15696). Please change the used CMake version - both, CMake 3.2 and CMake 3.4 are working fine. Or use a different generator (e.g. Ninja)." )
ENDIF()

# Options
option(ENABLE_TESTING "Enables unit/bundle testing" FALSE)
if (ENABLE_TESTING)
    find_package(GTest CONFIG QUIET)
    if (NOT GTest_FOUND)
        include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/AddGTest.cmake)
    endif()
endif ()

# Set C specific flags
set(CMAKE_C_FLAGS "-D_GNU_SOURCE -std=gnu99 -fPIC ${CMAKE_C_FLAGS}")
set(CMAKE_C_FLAGS "-Wall -Werror ${CMAKE_C_FLAGS}")

# Set C++ specific flags
set(CMAKE_CXX_STANDARD 17) #Celix header only C++ supported is based on C++17.
set(CMAKE_CXX_FLAGS "-fno-rtti ${CMAKE_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS "-Wall -Werror -Wextra -Weffc++ ${CMAKE_CXX_FLAGS}")

if(APPLE)
    set(CMAKE_MACOSX_RPATH 1)
endif()

if(NOT APPLE)
    set(CMAKE_C_FLAGS "-pthread ${CMAKE_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "-pthread ${CMAKE_CXX_FLAGS}")
    set(CMAKE_EXE_LINKER_FLAGS "-pthread ${CMAKE_EXE_LINKER_FLAGS}")

    #prevent the linker from optimizing out linked libraries. libraries linked against executable are maybe not used
    #by the executable, but could be used by the (dynamically) loaded libraries.
    set(CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} -Wl,--no-as-needed")
endif()

# Set compiler specific options
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
    set(CMAKE_C_FLAGS "-Wno-nullability-completeness -Wno-expansion-to-defined ${CMAKE_C_FLAGS}")
endif()

if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
    set(CMAKE_C_FLAGS "-Wno-unused-result ${CMAKE_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "-Wno-unused-result ${CMAKE_CXX_FLAGS}")
    if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 7.0)
        set(CMAKE_C_FLAGS "-Wno-format-truncation -Wno-stringop-overflow ${CMAKE_C_FLAGS}")
        set(CMAKE_CXX_FLAGS "-Wno-format-truncation -Wno-stringop-overflow ${CMAKE_CXX_FLAGS}")
    endif()
    if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8.0)
        set(CMAKE_C_FLAGS "-Wno-stringop-truncation ${CMAKE_C_FLAGS}")
        set(CMAKE_CXX_FLAGS "-Wno-stringop-truncation ${CMAKE_CXX_FLAGS}")
    endif()
endif()

option(ENABLE_MORE_WARNINGS "whether to enable more compiler warnings." OFF)
if (ENABLE_MORE_WARNINGS)
    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
        if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4)
            set(CMAKE_CXX_EXTRA_FLAGS "-Wlogical-op -Wold-style-cast -Wuseless-cast -Wdouble-promotion -Wshadow -Wformat=2")
        endif()
        if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6)
            set(CMAKE_CXX_EXTRA_FLAGS "-Wduplicated-cond -Wnull-dereference ${CMAKE_CXX_EXTRA_FLAGS}")
        endif()
        if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7)
            set(CMAKE_CXX_EXTRA_FLAGS "-Wrestrict -Wduplicated-branches ${CMAKE_CXX_EXTRA_FLAGS}")
        endif()
    endif()

    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
        if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.5)
            set(CMAKE_CXX_EXTRA_FLAGS "-Wlogical-op -Wold-style-cast -Wshadow -Wformat=2 -Wnull-dereference")
        endif()
        if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4)
            set(CMAKE_CXX_EXTRA_FLAGS "-Wold-style-cast -Wuseless-cast ${CMAKE_CXX_EXTRA_FLAGS}")
        endif()
    endif()

    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_EXTRA_FLAGS} ${CMAKE_CXX_FLAGS}")
endif()

# Set build type specific flags
# Debug
set(CMAKE_C_FLAGS_DEBUG "-g -DDEBUG ${CMAKE_C_FLAGS}")
set(CMAKE_CXX_FLAGS_DEBUG "-g -DDEBUG ${CMAKE_CXX_FLAGS}")
set(CMAKE_DEBUG_POSTFIX "d")

if (CMAKE_BUILD_TYPE STREQUAL "Debug")
    set(CMAKE_EXECUTABLE_SUFFIX ${CMAKE_DEBUG_POSTFIX})
endif()

# Set version for the framework package/release
if (NOT DEFINED CELIX_MAJOR)
    set(CELIX_MAJOR "2")
    set(CELIX_MINOR "3")
    set(CELIX_MICRO "0")
endif ()

# Default bundle version
set(DEFAULT_VERSION 1.0.0)

if (ENABLE_TESTING)
    enable_testing()
endif()

option(CELIX_INSTALL_DEPRECATED_API "whether to install (and use) deprecated apis (i.e. header without a celix_ prefix." ON)

option(CELIX_ADD_DEPRECATED_ATTRIBUTES "If enabled add deprecated attributes to deprecated services/functions." ON)
if (CELIX_ADD_DEPRECATED_ATTRIBUTES)
    set(CMAKE_C_FLAGS "-DCELIX_ADD_DEPRECATED_ATTRIBUTES ${CMAKE_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "-DCELIX_ADD_DEPRECATED_ATTRIBUTES ${CMAKE_CXX_FLAGS}")
endif ()

option(CELIX_ADD_OPENSSL_DEP "Enabled building Celix framework & etcdlib with OpenSSL library dependency. This can help in some libcurl resolving issues" OFF)
set(CELIX_OPTIONAL_EXTRA_LIBS "")
if (CELIX_ADD_OPENSSL_DEP)
    find_package(OpenSSL REQUIRED)
    set(CELIX_OPTIONAL_EXTRA_LIBS "OpenSSL::SSL")
endif ()

option(CELIX_USE_ZIP_INSTEAD_OF_JAR "Default Celix cmake command will use jar to package bundle (if found). This option enforces Celix to use zip instead." OFF)

option(CELIX_CXX "Build C++ libraries and bundles. Note for tests C++ is always used." ON)

#Libraries and Launcher
add_subdirectory(libs)

#Bundles
add_subdirectory(bundles)

#Experimental Bundles/Libraries
add_subdirectory(misc/experimental)

#Example as last, because some example will check if underlining options are enabled
add_subdirectory(examples/celix-examples examples)

#export targets
install(EXPORT celix NAMESPACE Celix:: DESTINATION share/celix/cmake FILE Targets.cmake COMPONENT cmake)
install_celix_targets(celix NAMESPACE Celix:: DESTINATION share/celix/cmake FILE CelixTargets COMPONENT cmake)

#install celix cmake modules
install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules/ DESTINATION share/celix/cmake/Modules)
install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_celix/ DESTINATION share/celix/cmake/cmake_celix)

#configure and install CelixConfig and CelixConfigVersion files
configure_file(cmake/CelixConfigVersion.cmake.in
        "${PROJECT_BINARY_DIR}/celix/gen/cmake/CelixConfigVersion.cmake" @ONLY)

install(FILES
        "cmake/CelixConfig.cmake"
        "${PROJECT_BINARY_DIR}/celix/gen/cmake/CelixConfigVersion.cmake"
        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Celix" COMPONENT cmake)