CMakeLists.txt

# Copyright(c) 2015 - 2022 Denis Blank <denis.blank at outlook dot com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files(the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions :
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

cmake_minimum_required(VERSION 3.11)

project(
  continuable
  VERSION 4.0.0
  LANGUAGES C CXX)

if(CTI_CONTINUABLE_IS_FIND_INCLUDED)
  set(CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT OFF)
else()
  string(COMPARE EQUAL ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_SOURCE_DIR}
                 CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT)
endif()

if(CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT)
  message(
    STATUS
      "Building with ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER_VERSION})")
endif()

option(CTI_CONTINUABLE_WITH_INSTALL "Add the continuable install targets"
       ${CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT})

option(CTI_CONTINUABLE_WITH_TESTS "Build the continuable unit tests"
       ${CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT})

option(CTI_CONTINUABLE_WITH_EXAMPLES "Build the continuable examples"
       ${CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT})

option(CTI_CONTINUABLE_WITH_BENCHMARKS "Build the continuable benchmarks" OFF)

option(CTI_CONTINUABLE_WITH_NO_EXCEPTIONS "Disable exception support" OFF)

option(CTI_CONTINUABLE_WITH_UNHANDLED_EXCEPTIONS
       "Enable unhandled asynchronous exceptions" OFF)

option(CTI_CONTINUABLE_WITH_COROUTINE "Enable C++20 coroutines" OFF)

option(CTI_CONTINUABLE_WITH_EXPERIMENTAL_COROUTINE
       "Enable experimental coroutines" OFF)

option(CTI_CONTINUABLE_WITH_CPP_LATEST
       "Enable the highest C++ standard available for testing polyfills" OFF)

option(CTI_CONTINUABLE_WITH_LIGHT_TESTS
       "Disable some template heavy unit tests (for CI usage)" OFF)

# Top level project settings only
if(CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT)
  set(CTI_CONTINUABLE_WITH_CONCURRENT_JOBS
      "0"
      CACHE
        STRING
        "Set the number of concurrent compilation jobs (0 = unlimited, for CI usage)"
  )
else()
  set(CTI_CONTINUABLE_WITH_CONCURRENT_JOBS "0")
endif()

if(NOT TARGET Threads::Threads)
  set(THREADS_PREFER_PTHREAD_FLAG ON)
  find_package(Threads REQUIRED)
endif()

if(CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT)
  include(cmake/CMakeLists.txt)
  add_subdirectory(dep)
else()
  if(NOT TARGET function2::function2)
    find_package(function2 4 REQUIRED)
  endif()
endif()

# continuable-base
if(CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT)
  add_library(continuable-base INTERFACE)
else()
  add_library(continuable-base INTERFACE IMPORTED GLOBAL)
endif()

add_library(continuable::continuable-base ALIAS continuable-base)

target_include_directories(
  continuable-base
  INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>
            $<INSTALL_INTERFACE:include>)

target_link_libraries(continuable-base INTERFACE Threads::Threads)

target_compile_features(
  continuable-base
  INTERFACE cxx_alias_templates
            cxx_auto_type
            cxx_constexpr
            cxx_decltype
            cxx_decltype_auto
            cxx_final
            cxx_lambdas
            cxx_generic_lambdas
            cxx_variadic_templates
            cxx_defaulted_functions
            cxx_nullptr
            cxx_trailing_return_types
            cxx_return_type_deduction)

if(CTI_CONTINUABLE_WITH_CPP_LATEST)
  target_compile_features(continuable-base INTERFACE cxx_std_20)
endif()

if(CTI_CONTINUABLE_WITH_COROUTINE)
  if(NOT CTI_CONTINUABLE_WITH_CPP_LATEST)
    message(FATAL_ERROR "CTI_CONTINUABLE_WITH_COROUTINE requires "
                        "CTI_CONTINUABLE_WITH_CPP_LATEST!")
  endif()

  target_compile_options(
    continuable-base
    INTERFACE $<$<CXX_COMPILER_ID:MSVC>:/await:strict>
              $<$<CXX_COMPILER_ID:Clang>:-fcoroutines-ts>
              $<$<CXX_COMPILER_ID:GNU>:-fcoroutines>)
elseif(CTI_CONTINUABLE_WITH_EXPERIMENTAL_COROUTINE)
  target_compile_options(
    continuable-base INTERFACE $<$<CXX_COMPILER_ID:MSVC>:/await>
                               $<$<CXX_COMPILER_ID:Clang>:-fcoroutines-ts>)
endif()

if(CTI_CONTINUABLE_WITH_UNHANDLED_EXCEPTIONS)
  target_compile_definitions(continuable-base
                             INTERFACE CONTINUABLE_WITH_UNHANDLED_EXCEPTIONS)
endif()

if(CTI_CONTINUABLE_IS_TOP_LEVEL_PROJECT)
  add_library(continuable INTERFACE)
else()
  add_library(continuable INTERFACE IMPORTED GLOBAL)
endif()

add_library(continuable::continuable ALIAS continuable)

target_link_libraries(continuable INTERFACE continuable::continuable-base
                                            function2::function2)

if(CTI_CONTINUABLE_WITH_INSTALL)
  include(ExternalProject)
  include(GNUInstallDirs)
  include(CMakePackageConfigHelpers)

  # Create an install target: Headers and license files
  install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/continuable"
          DESTINATION "include")
  install(FILES "LICENSE.txt" DESTINATION .)
  install(FILES "Readme.md" DESTINATION .)

  # Config.cmake
  write_basic_package_version_file(
    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
    VERSION ${PROJECT_VERSION}
    COMPATIBILITY SameMajorVersion)
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
          DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")

  # ConfigVersion.cmake
  configure_package_config_file(
    "cmake/config.cmake.in"
    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
    INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
    # PATH_VARS INCLUDE_INSTALL_DIR SYSCONFIG_INSTALL_DIR
  )
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
          DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")

  # Targets.cmake
  export(
    TARGETS ${PROJECT_NAME} ${PROJECT_NAME}-base
    NAMESPACE ${PROJECT_NAME}::
    FILE "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Targets.cmake")
  install(
    TARGETS ${PROJECT_NAME} ${PROJECT_NAME}-base
    EXPORT "${PROJECT_NAME}Targets"
    INCLUDES
    DESTINATION "include")
  install(
    EXPORT "${PROJECT_NAME}Targets"
    NAMESPACE ${PROJECT_NAME}::
    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")

  # Setup CPack for bundling
  set(CPACK_GENERATOR "ZIP")
  set(CPACK_PACKAGE_VERSION_MAJOR ${PROJECT_VERSION_MAJOR})
  set(CPACK_PACKAGE_VERSION_MINOR ${PROJECT_VERSION_MINOR})
  set(CPACK_PACKAGE_VERSION_PATCH ${PROJECT_VERSION_PATCH})

  include(CPack)
endif()

# Testing and examples
if(CTI_CONTINUABLE_WITH_TESTS OR CTI_CONTINUABLE_WITH_EXAMPLES)
  if(MSVC)
    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
    string(REGEX REPLACE "/W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
  endif()

  enable_testing()

  if(CTI_CONTINUABLE_WITH_TESTS)
    add_subdirectory(test)
  endif()

  if(CTI_CONTINUABLE_WITH_EXAMPLES)
    add_subdirectory(examples)
  endif()
endif()