# Copyright (c) 2015 Amanieu d'Antras
#
# 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 3.1)
project(Async++ C CXX)

option(BUILD_SHARED_LIBS "Build Async++ as a shared library" OFF)
option(USE_CXX_EXCEPTIONS "Enable C++ exception support" ON)
if(APPLE)
  option(BUILD_FRAMEWORK "Build a Mac OS X framework instead of a library" OFF)
  if(BUILD_FRAMEWORK AND NOT BUILD_SHARED_LIBS)
    message(FATAL_ERROR "Can't build a framework with static libraries")
  endif()
endif()

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Add all source and header files so IDEs can see them
set(ASYNCXX_INCLUDE
    ${PROJECT_SOURCE_DIR}/include/async++/aligned_alloc.h
    ${PROJECT_SOURCE_DIR}/include/async++/cancel.h
    ${PROJECT_SOURCE_DIR}/include/async++/continuation_vector.h
    ${PROJECT_SOURCE_DIR}/include/async++/parallel_for.h
    ${PROJECT_SOURCE_DIR}/include/async++/parallel_invoke.h
    ${PROJECT_SOURCE_DIR}/include/async++/parallel_reduce.h
    ${PROJECT_SOURCE_DIR}/include/async++/partitioner.h
    ${PROJECT_SOURCE_DIR}/include/async++/range.h
    ${PROJECT_SOURCE_DIR}/include/async++/ref_count.h
    ${PROJECT_SOURCE_DIR}/include/async++/scheduler.h
    ${PROJECT_SOURCE_DIR}/include/async++/scheduler_fwd.h
    ${PROJECT_SOURCE_DIR}/include/async++/task.h
    ${PROJECT_SOURCE_DIR}/include/async++/task_base.h
    ${PROJECT_SOURCE_DIR}/include/async++/traits.h
    ${PROJECT_SOURCE_DIR}/include/async++/when_all_any.h)
set(ASYNCXX_SRC
    ${PROJECT_SOURCE_DIR}/src/internal.h
    ${PROJECT_SOURCE_DIR}/src/fifo_queue.h
    ${PROJECT_SOURCE_DIR}/src/scheduler.cpp
    ${PROJECT_SOURCE_DIR}/src/singleton.h
    ${PROJECT_SOURCE_DIR}/src/task_wait_event.h
    ${PROJECT_SOURCE_DIR}/src/threadpool_scheduler.cpp
    ${PROJECT_SOURCE_DIR}/src/work_steal_queue.h)
source_group(include FILES ${PROJECT_SOURCE_DIR}/include/async++.h
                           ${ASYNCXX_INCLUDE})
source_group(src FILES ${ASYNCXX_SRC})
add_library(Async++ ${PROJECT_SOURCE_DIR}/include/async++.h ${ASYNCXX_INCLUDE}
                    ${ASYNCXX_SRC})

# Async++ only depends on the C++11 standard libraries, but some implementations
# require the -pthread compiler flag to enable threading functionality.
if(NOT MSVC)
  target_compile_options(Async++ PRIVATE -std=c++11)
endif()
if(APPLE)
  # Use libc++ on Mac because the shipped libstdc++ version is ancient
  target_compile_options(Async++ PRIVATE -stdlib=libc++)
  set_target_properties(Async++ PROPERTIES LINK_FLAGS -stdlib=libc++)
endif()
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
target_link_libraries(Async++ PUBLIC Threads::Threads)

# Set up preprocessor definitions
target_include_directories(Async++ PRIVATE ${PROJECT_SOURCE_DIR}/include)
set_target_properties(Async++ PROPERTIES DEFINE_SYMBOL LIBASYNC_BUILD)
if(BUILD_SHARED_LIBS)
  # Minimize the set of symbols exported by libraries
  set_target_properties(Async++ PROPERTIES CXX_VISIBILITY_PRESET hidden
                                           VISIBILITY_INLINES_HIDDEN ON)
else()
  target_compile_definitions(Async++ PUBLIC LIBASYNC_STATIC)
endif()

# Enable warnings for strict C++ standard conformance
if(NOT MSVC)
  target_compile_options(Async++ PRIVATE -Wall -Wextra -pedantic)
endif()

# Async++ doesn't make use of RTTI information, so don't generate it. There are
# issues on Apple platforms with exceptions and -fno-rtti, so keep it enabled
# there. See
# https://stackoverflow.com/questions/21737201/problems-throwing-and-catching-exceptions-on-os-x-with-fno-rtti
if(MSVC)
  target_compile_options(Async++ PRIVATE /GR-)
elseif(NOT APPLE)
  target_compile_options(Async++ PRIVATE -fno-rtti)
endif()

# Allow disabling exceptions, but warn the user about the consequences
if(NOT USE_CXX_EXCEPTIONS)
  message(
    WARNING "Exceptions have been disabled. Any operation that would "
            "throw an exception will result in a call to std::abort() instead.")
  target_compile_definitions(Async++ PUBLIC LIBASYNC_NO_EXCEPTIONS)
  if(MSVC)
    target_compile_options(Async++ PUBLIC /EHs-c-)
  else()
    target_compile_options(Async++ PUBLIC -fno-exceptions)
  endif()
endif()

# /Zc:__cplusplus is required to make __cplusplus accurate /Zc:__cplusplus is
# available starting with Visual Studio 2017 version 15.7 (according to
# https://docs.microsoft.com/en-us/cpp/build/reference/zc-cplusplus) That
# version is equivalent to _MSC_VER==1914 (according to
# https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=vs-2019)
# CMake's ${MSVC_VERSION} is equivalent to _MSC_VER (according to
# https://cmake.org/cmake/help/latest/variable/MSVC_VERSION.html#variable:MSVC_VERSION)
# GREATER and EQUAL are used because GREATER_EQUAL is available starting with
# CMake 3.7 (according to
# https://cmake.org/cmake/help/v3.7/release/3.7.html#commands)
if((MSVC) AND ((MSVC_VERSION GREATER 1914) OR (MSVC_VERSION EQUAL 1914)))
  target_compile_options(Async++ PUBLIC /Zc:__cplusplus)
endif()

include(CMakePackageConfigHelpers)
configure_package_config_file(
  "${CMAKE_CURRENT_LIST_DIR}/Async++Config.cmake.in"
  "${PROJECT_BINARY_DIR}/Async++Config.cmake" INSTALL_DESTINATION cmake)

install(FILES "${PROJECT_BINARY_DIR}/Async++Config.cmake" DESTINATION cmake)

# Install the library and produce a CMake export script
include(GNUInstallDirs)
install(
  TARGETS Async++
  EXPORT Async++
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
  FRAMEWORK DESTINATION Frameworks)
export(EXPORT Async++)
install(EXPORT Async++ DESTINATION cmake)
if(APPLE AND BUILD_FRAMEWORK)
  set_target_properties(Async++ PROPERTIES OUTPUT_NAME Async++ FRAMEWORK ON)
  set_source_files_properties(
    ${ASYNCXX_INCLUDE} PROPERTIES MACOSX_PACKAGE_LOCATION Headers/async++)
  set_source_files_properties(${PROJECT_SOURCE_DIR}/include/async++.h
                              PROPERTIES MACOSX_PACKAGE_LOCATION Headers)
else()
  set_target_properties(Async++ PROPERTIES OUTPUT_NAME async++)
  target_include_directories(
    Async++ INTERFACE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
                      $<INSTALL_INTERFACE:include>)
  install(FILES ${PROJECT_SOURCE_DIR}/include/async++.h DESTINATION include)
  install(FILES ${ASYNCXX_INCLUDE} DESTINATION include/async++)
endif()

set(CPACK_GENERATOR "DEB")
set(CPACK_DEBIAN_PACKAGE_MAINTAINER "none") # required

include(CPack)