kc3-lang/libevent/CMakeLists.txt

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  Commit

• Hash : a2ed23b1
  Author :
  Date : 2024-11-24T23:32:04
  

  Replace deprecated find_package(PythonInterp) with Python2/Python3
  
  Fixes: #1751
  

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• CMakeLists.txt

• #
  # Libevent CMake project
  #
  # Based on initial work by:
  #    Alexey Ozeritsky
  #
  # Additional changes:
  #   Brodie Thiesfield
  #   Joakim Soderberg
  #   Trond Norbye
  #   Sergei Nikulov
  #
  #   Build example:
  #
  #       cd libevent
  #       md build
  #       cd build
  #       cmake -G "Visual Studio 10" ..
  #       start libevent.sln
  #
  
  cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
  
  if (POLICY CMP0074)
      cmake_policy(SET CMP0074 NEW)
  endif()
  if (POLICY CMP0075)
      cmake_policy(SET CMP0075 NEW)
  endif()
  
  if(NOT CMAKE_BUILD_TYPE)
      set(CMAKE_BUILD_TYPE Release
          CACHE STRING "Set build type to Debug or Release (default Release)" FORCE)
      message(STATUS "Set CMAKE_BUILD_TYPE to Release (default)")
  endif()
  string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
  
  # Usually it is OK to define it unconditionally, but the problem is that we use
  # CMAKE_DEBUG_POSTFIX in *.pc.in
  if (CMAKE_BUILD_TYPE_LOWER STREQUAL "debug")
      if(NOT DEFINED CMAKE_DEBUG_POSTFIX)
          set(CMAKE_DEBUG_POSTFIX d)
      endif()
  endif()
  
  set(EVENT__LIBRARY_TYPE DEFAULT CACHE STRING
      "Set library type to SHARED/STATIC/BOTH (default SHARED for MSVC, otherwise BOTH)")
  
  project(libevent C)
  
  list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/")
  string(REGEX MATCH "SunOS" SOLARIS "${CMAKE_SYSTEM_NAME}")
  
  
  include(CheckTypeSize)
  include(CheckFileOffsetBits)
  include(Macros)
  include(CheckVariableExists)
  include(CheckSymbolExists)
  include(CheckStructHasMember)
  include(CheckCSourceCompiles)
  include(CheckPrototypeDefinition)
  include(CheckFunctionKeywords)
  include(CheckConstExists)
  include(AddCompilerFlags)
  include(AddLinkerFlags)
  include(VersionViaGit)
  
  event_fuzzy_version_from_git()
  
  set(EVENT_VERSION_MAJOR ${EVENT_GIT___VERSION_MAJOR})
  set(EVENT_VERSION_MINOR ${EVENT_GIT___VERSION_MINOR})
  set(EVENT_VERSION_PATCH ${EVENT_GIT___VERSION_PATCH})
  set(EVENT_VERSION_STAGE ${EVENT_GIT___VERSION_STAGE})
  
  
  set(EVENT_ABI_MAJOR ${EVENT_VERSION_MAJOR})
  set(EVENT_ABI_MINOR ${EVENT_VERSION_MINOR})
  set(EVENT_ABI_PATCH ${EVENT_VERSION_PATCH})
  
  set(EVENT_ABI_LIBVERSION
      "${EVENT_ABI_MAJOR}.${EVENT_ABI_MINOR}.${EVENT_ABI_PATCH}")
  
  set(EVENT_PACKAGE_VERSION
      "${EVENT_VERSION_MAJOR}.${EVENT_VERSION_MINOR}.${EVENT_VERSION_PATCH}")
  
  # equals to VERSION_INFO in Makefile.am
  set(EVENT_ABI_LIBVERSION_CURRENT   1)
  set(EVENT_ABI_LIBVERSION_REVISION  0)
  set(EVENT_ABI_LIBVERSION_AGE       0)
  
  # equals to RELEASE in Makefile.am
  set(EVENT_PACKAGE_RELEASE 2.2)
  
  # The last number is development version or not.
  set(EVENT_NUMERIC_VERSION 0x02020100)
  
  # only a subset of names can be used, defaults to "beta"
  set(EVENT_STAGE_NAME ${EVENT_VERSION_STAGE})
  
  # a list that defines what can set for EVENT_STAGE_VERSION
  set(EVENT__ALLOWED_STAGE_NAMES
  	rc
  	beta
  	alpha
  	alpha-dev
  	release
  	stable
  )
  list(
  	FIND EVENT__ALLOWED_STAGE_NAMES
  	"${EVENT_STAGE_NAME}"
  	EVENT__STAGE_RET
  )
  if (EVENT__STAGE_RET EQUAL -1)
  	message(WARNING
  		"stage ${EVENT_STAGE_NAME} is not allowed, reset to beta")
  	set(EVENT_STAGE_NAME beta)
  endif()
  
  set(EVENT_VERSION
  	"${EVENT_VERSION_MAJOR}.${EVENT_VERSION_MINOR}.${EVENT_VERSION_PATCH}-${EVENT_STAGE_NAME}")
  
  option(EVENT__DISABLE_DEBUG_MODE
      "Define if libevent should build without support for a debug mode" OFF)
  
  option(EVENT__ENABLE_VERBOSE_DEBUG
      "Enables verbose debugging" OFF)
  
  option(EVENT__DISABLE_MM_REPLACEMENT
      "Define if libevent should not allow replacing the mm functions" OFF)
  
  option(EVENT__DISABLE_THREAD_SUPPORT
      "Define if libevent should not be compiled with thread support" OFF)
  
  set(EVENT__DISABLE_OPENSSL AUTO CACHE STRING
      "OpenSSL library support: AUTO (use if present), ON (ignore), OFF (require presence)")
  set_property(CACHE EVENT__DISABLE_OPENSSL PROPERTY STRINGS AUTO ON OFF)
  
  set(EVENT__DISABLE_MBEDTLS AUTO CACHE STRING
      "Mbed TLS library support: AUTO (use if present), ON (ignore), OFF (require presence)")
  set_property(CACHE EVENT__DISABLE_MBEDTLS PROPERTY STRINGS AUTO ON OFF)
  
  option(EVENT__DISABLE_BENCHMARK
      "Defines if libevent should build without the benchmark executables" OFF)
  
  option(EVENT__DISABLE_TESTS
      "If tests should be compiled or not" OFF)
  
  option(EVENT__DISABLE_REGRESS
      "Disable the regress tests" OFF)
  
  option(EVENT__DISABLE_SAMPLES
      "Disable sample files" OFF)
  
  option(EVENT__DISABLE_CLOCK_GETTIME
      "Do not use clock_gettime even if it is available" OFF)
  
  option(EVENT__FORCE_KQUEUE_CHECK
      "When crosscompiling forces running a test program that verifies that Kqueue works with pipes. Note that this requires you to manually run the test program on the cross compilation target to verify that it works. See cmake documentation for try_run for more details" OFF)
  
  # TODO: Add --disable-largefile     omit support for large files
  option(EVENT__COVERAGE
  "Enable running gcov to get a test coverage report (only works with GCC/CLang). Make sure to enable -DCMAKE_BUILD_TYPE=Debug as well." OFF)
  
  # Put the libaries and binaries that get built into directories at the
  # top of the build tree rather than in hard-to-find leaf directories.
  #
  # But only if this variables are not defined yet
  # (i.e. libevent is used via add_subdirectory())
  if (NOT DEFINED CMAKE_RUNTIME_OUTPUT_DIRECTORY)
      set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)
  endif()
  if (NOT DEFINED CMAKE_LIBRARY_OUTPUT_DIRECTORY)
      set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
  endif()
  if (NOT DEFINED CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
      set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
  endif()
  
  include(GNUInstallDirs)
  
  # The RPATH to be used when installing, but only if it's not a system directory
  #
  # Refs: https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
  macro(Configure_RPATH)
      # NOTE: that CMAKE_INSTALL_FULL_LIBDIR not always normalized correctly, i.e.:
      # - "///" -> "/"
      # - "/////usr///" -> "//usr"
      # So it should be normalized again.
      get_filename_component(CMAKE_INSTALL_LIBDIR_NORMALIZED "${CMAKE_INSTALL_FULL_LIBDIR}" REALPATH)
      list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_LIBDIR_NORMALIZED}" isSystemDir)
  
      if(DEFINED CMAKE_INSTALL_RPATH)
          message(STATUS "CMAKE_INSTALL_RPATH already set")
      elseif("${isSystemDir}" STREQUAL "-1")
          set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_LIBDIR_NORMALIZED}")
      else()
          message(STATUS "Detected install to system directory")
      endif()
  endmacro()
  Configure_RPATH()
  
  if (EVENT__ENABLE_VERBOSE_DEBUG)
      add_definitions(-DUSE_DEBUG=1)
  endif()
  
  add_linker_flags(-Wl,-z,max-page-size=16384)
  
  # make it colorful under ninja-build
  if ("${CMAKE_GENERATOR}" STREQUAL "Ninja")
      add_compiler_flags(-fdiagnostics-color=always)
  endif()
  
  # Setup compiler flags for coverage.
  if (EVENT__COVERAGE)
      if (NOT "${CMAKE_BUILD_TYPE_LOWER}" STREQUAL "debug")
          message(FATAL_ERROR "Coverage requires -DCMAKE_BUILD_TYPE=Debug")
      endif()
  
      message(STATUS "Setting coverage compiler flags")
  
      list(APPEND CMAKE_REQUIRED_LIBRARIES "--coverage")
      add_compiler_flags(-g -O0 --coverage)
      list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "--coverage")
  endif()
  
  set(GNUC 0)
  set(CLANG 0)
  set(MSVC 0)
  if (("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang") OR
      ("${CMAKE_C_COMPILER_ID}" STREQUAL "AppleClang"))
      set(CLANG 1)
  endif()
  if (("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU") OR (${CLANG}))
      set(GNUC 1)
  endif()
  if (("${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC") OR ("${CMAKE_C_SIMULATE_ID}" STREQUAL "MSVC"))
      set(MSVC 1)
  endif()
  
  # Detect library type
  set(EVENT_LIBRARY_TYPE)
  if ("${EVENT__LIBRARY_TYPE}" STREQUAL "DEFAULT")
      if (${MSVC})
          set(EVENT_LIBRARY_TYPE SHARED)
      else()
          set(EVENT_LIBRARY_TYPE BOTH)
      endif()
  else()
      string(TOUPPER "${EVENT__LIBRARY_TYPE}" EVENT_LIBRARY_TYPE)
  endif()
  if ((${MSVC}) AND ("${EVENT_LIBRARY_TYPE}" STREQUAL "BOTH"))
      message(WARNING
        "Building SHARED and STATIC is not supported for MSVC "
        "(due to conflicts in library name"
        " between STATIC library and IMPORTED library for SHARED libraries)")
  endif()
  set(EVENT_LIBRARY_STATIC OFF)
  set(EVENT_LIBRARY_SHARED OFF)
  if ("${EVENT_LIBRARY_TYPE}" STREQUAL "BOTH")
      set(EVENT_LIBRARY_STATIC ON)
      set(EVENT_LIBRARY_SHARED ON)
  elseif ("${EVENT_LIBRARY_TYPE}" STREQUAL "STATIC")
      set(EVENT_LIBRARY_STATIC ON)
  elseif ("${EVENT_LIBRARY_TYPE}" STREQUAL "SHARED")
      set(EVENT_LIBRARY_SHARED ON)
  else()
      message(FATAL_ERROR "${EVENT_LIBRARY_TYPE} is not supported")
  endif()
  
  # brew support
  if (APPLE)
      find_program(BREW brew)
  endif()
  
  if (${MSVC})
      set(msvc_static_runtime OFF)
      if ("${EVENT_LIBRARY_TYPE}" STREQUAL "STATIC")
          set(msvc_static_runtime ON)
      endif()
  
      # For more info:
      # - https://docs.microsoft.com/en-us/cpp/build/reference/md-mt-ld-use-run-time-library?view=vs-2017
      # - https://gitlab.kitware.com/cmake/community/wikis/FAQ#how-can-i-build-my-msvc-application-with-a-static-runtime
      option(EVENT__MSVC_STATIC_RUNTIME
             "Link static runtime libraries"
             ${msvc_static_runtime})
  
      if (EVENT__MSVC_STATIC_RUNTIME)
          foreach (flag_var
                   CMAKE_C_FLAGS_DEBUG
                   CMAKE_C_FLAGS_RELEASE
                   CMAKE_C_FLAGS_MINSIZEREL
                   CMAKE_C_FLAGS_RELWITHDEBINFO
          )
              if (${flag_var} MATCHES "/MD")
                  string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
              endif()
          endforeach()
      endif()
  endif()
  
  # GNUC specific options.
  if (${GNUC})
      option(EVENT__DISABLE_GCC_WARNINGS "Disable verbose warnings with GCC" OFF)
      option(EVENT__ENABLE_GCC_HARDENING "Enable compiler security checks" OFF)
      option(EVENT__ENABLE_GCC_FUNCTION_SECTIONS "Enable gcc function sections" OFF)
      option(EVENT__ENABLE_GCC_WARNINGS "Make all GCC warnings into errors" OFF)
  
      list(APPEND __FLAGS
           -Wall -Wextra -Wno-unused-parameter -Wstrict-aliasing -Wstrict-prototypes
           -Wundef
  
           -fno-strict-aliasing # gcc 2.9.5+
           -Wmissing-prototypes
  
           # gcc 4
           -Winit-self
           -Wmissing-field-initializers
           -Wdeclaration-after-statement
  
           # gcc 4.2
           -Waddress
           -Wnormalized=id
           -Woverride-init
  
           # gcc 4.5
           -Wlogical-op
  
           -Wwrite-strings
  
           # Disable unused-function warnings. These trigger for minheap-internal.h.
           -Wno-unused-function
  
           -Wno-pragmas
  
           -Wvla
      )
  
      if (${CLANG})
          list(APPEND __FLAGS
               # we use this hack in tests
               -Wno-void-pointer-to-enum-cast)
      endif()
  
      if (EVENT__DISABLE_GCC_WARNINGS)
          list(APPEND __FLAGS -w)
      endif()
  
      if (EVENT__ENABLE_GCC_HARDENING)
          list(APPEND __FLAGS
               -fstack-protector-all
               -fwrapv
               -fPIE
               -Wstack-protector
               "--param ssp-buffer-size=1")
  
          add_definitions(-D_FORTIFY_SOURCE=3)
      endif()
  
      if (EVENT__ENABLE_GCC_FUNCTION_SECTIONS)
          list(APPEND __FLAGS -ffunction-sections)
          # TODO: Add --gc-sections support. We need some checks for NetBSD to ensure this works.
      endif()
  
      if (EVENT__ENABLE_GCC_WARNINGS)
          list(APPEND __FLAGS -Werror)
      endif()
  
      add_compiler_flags(${__FLAGS})
  endif()
  
  if (APPLE)
      # Clang on macOS emits warnings for each directory specified which isn't used
      add_compiler_flags(
          -Qunused-arguments
      )
  endif()
  
  if (MINGW OR CYGWIN)
      set(WIN32 TRUE)
  endif()
  
  # Winsock.
  if(WIN32)
      list(APPEND CMAKE_REQUIRED_LIBRARIES
          ws2_32
          shell32
          advapi32
          bcrypt
      )
      set(CMAKE_REQUIRED_DEFINITIONS -FIwinsock2.h -FIws2tcpip.h -D_WIN32_WINNT=0x0600)
  endif()
  if (SOLARIS)
      list(APPEND CMAKE_REQUIRED_LIBRARIES
          socket
          nsl
      )
  endif()
  
  # Check if _GNU_SOURCE is available.
  if (NOT DEFINED _GNU_SOURCE)
    CHECK_SYMBOL_EXISTS(__GNU_LIBRARY__ "features.h" _GNU_SOURCE)
  
    if (NOT _GNU_SOURCE)
      unset(_GNU_SOURCE CACHE)
      CHECK_SYMBOL_EXISTS(_GNU_SOURCE "features.h" _GNU_SOURCE)
    endif()
  
    if (ANDROID)
      set(_GNU_SOURCE TRUE)
    endif()
  endif()
  
  if (_GNU_SOURCE)
      set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
  endif()
  
  # Check if header files exist
  list(APPEND FILES_TO_CHECK
      fcntl.h
      inttypes.h
      memory.h
      signal.h
      stdarg.h
      stddef.h
      stdint.h
      stdlib.h
      string.h
      errno.h
      unistd.h
      time.h
      sys/types.h
      sys/stat.h
      sys/time.h
      sys/param.h
  )
  if (WIN32)
      list(APPEND FILES_TO_CHECK
          io.h
          winsock2.h
          ws2tcpip.h
          afunix.h
      )
  else()
      list(APPEND FILES_TO_CHECK
          netdb.h
          dlfcn.h
          arpa/inet.h
          poll.h
          port.h
          sys/socket.h
          sys/random.h
          sys/un.h
          sys/devpoll.h
          sys/epoll.h
          sys/eventfd.h
          sys/event.h
          sys/ioctl.h
          sys/mman.h
          sys/queue.h
          sys/tree.h
          sys/select.h
          sys/sendfile.h
          sys/uio.h
          sys/wait.h
          sys/resource.h
          sys/timerfd.h
          sys/signalfd.h
          netinet/in.h
          netinet/in6.h
          netinet/tcp.h
          ifaddrs.h
      )
  endif()
  
  if (NOT "${CMAKE_HOST_SYSTEM_NAME}" STREQUAL "Linux")
      list(APPEND FILES_TO_CHECK sys/sysctl.h)
  endif()
  
  if (APPLE)
      list(APPEND FILES_TO_CHECK
          mach/mach_time.h
          mach/mach.h
      )
  endif()
  
  if (NOT EVENT__DISABLE_THREAD_SUPPORT AND NOT WIN32)
      list(APPEND FILES_TO_CHECK pthread.h)
      # (Only `CHECK_TYPE_SIZE()' will use `CMAKE_EXTRA_INCLUDE_FILES')
      list(APPEND CMAKE_EXTRA_INCLUDE_FILES pthread.h)
  endif()
  
  # Fills EVENT_INCLUDES
  foreach(FILE ${FILES_TO_CHECK})
      CHECK_INCLUDE_FILE_CONCAT(${FILE} "EVENT")
  endforeach()
  unset(FILES_TO_CHECK)
  
  # Check if functions exist
  list(APPEND SYMBOLS_TO_CHECK
      getaddrinfo
      gethostbyname
      getnameinfo
      getprotobynumber
      getservbyname
      gettimeofday
      inet_ntop
      inet_pton
      nanosleep
      putenv
      signal
      socketpair
      strlcpy
      strsep
      strtok_r
      strtoll
      timeradd
      timerclear
      timerisset
      umask
  )
  if (NOT EVENT__DISABLE_CLOCK_GETTIME)
      list(APPEND SYMBOLS_TO_CHECK clock_gettime)
  endif()
  
  if (WIN32)
      list(APPEND SYMBOLS_TO_CHECK
          _gmtime64
          _gmtime64_s
      )
  else()
      list(APPEND SYMBOLS_TO_CHECK
          accept4
          arc4random
          arc4random_buf
          arc4random_stir
          epoll_create
          epoll_create1
          epoll_ctl
          epoll_pwait2
          eventfd
          fcntl
          getegid
          geteuid
          gethostbyname_r
          getifaddrs
          getrandom
          issetugid
          kqueue
          mmap
          mmap64
          pipe
          pipe2
          poll
          port_create
          pread
          select
          sendfile
          setenv
          setrlimit
          sigaction
          strsignal
          sysctl
          timerfd_create
          unsetenv
          usleep
      )
      if (APPLE)
          list(APPEND SYMBOLS_TO_CHECK mach_absolute_time)
      endif()
  endif()
  
  set(PTHREADS_AVAILABLE OFF)
  if (NOT EVENT__DISABLE_THREAD_SUPPORT)
      if (WIN32)
          list(APPEND SRC_CORE evthread_win32.c)
      elseif(ANDROID)
          # pthreads is built in to bionic
          set(EVENT__HAVE_PTHREADS 1)
          CHECK_TYPE_SIZE(pthread_t EVENT__SIZEOF_PTHREAD_T)
          list(APPEND SYMBOLS_TO_CHECK pthread_mutexattr_setprotocol)
          set(PTHREADS_AVAILABLE ON)
      else()
          find_package(Threads REQUIRED)
          if (NOT CMAKE_USE_PTHREADS_INIT)
              message(FATAL_ERROR
                      "Failed to find Pthreads, set EVENT__DISABLE_THREAD_SUPPORT to disable")
          endif()
          set(PTHREADS_AVAILABLE ON)
  
          set(EVENT__HAVE_PTHREADS 1)
          # for CHECK_SYMBOLS_EXIST()
          list(APPEND CMAKE_REQUIRED_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
          list(APPEND LIB_APPS Threads::Threads)
  
          CHECK_TYPE_SIZE(pthread_t EVENT__SIZEOF_PTHREAD_T)
          list(APPEND SYMBOLS_TO_CHECK pthread_mutexattr_setprotocol)
      endif()
  endif()
  
  list(APPEND CMAKE_EXTRA_INCLUDE_FILES ${EVENT_INCLUDES} stdio.h)
  CHECK_SYMBOLS_EXIST("${SYMBOLS_TO_CHECK}" "${CMAKE_EXTRA_INCLUDE_FILES}" "EVENT")
  unset(SYMBOLS_TO_CHECK)
  set(EVENT__HAVE_EPOLL ${EVENT__HAVE_EPOLL_CREATE})
  set(EVENT__HAVE_SIGNALFD ${EVENT__HAVE_SYS_SIGNALFD_H})
  if(WIN32 AND NOT CYGWIN)
      set(EVENT__HAVE_WEPOLL 1)
  endif()
  
  # Get the gethostbyname_r prototype.
  if(EVENT__HAVE_GETHOSTBYNAME_R)
      CHECK_PROTOTYPE_DEFINITION(gethostbyname_r
          "int gethostbyname_r(const char *name, struct hostent *hp, struct hostent_data *hdata)"
          "0"
          "netdb.h"
          EVENT__HAVE_GETHOSTBYNAME_R_3_ARG)
  
      CHECK_PROTOTYPE_DEFINITION(gethostbyname_r
          "struct hostent *gethostbyname_r(const char *name, struct hostent *hp, char *buf, size_t buflen, int *herr)"
          "NULL"
          "netdb.h"
          EVENT__HAVE_GETHOSTBYNAME_R_5_ARG)
  
      CHECK_PROTOTYPE_DEFINITION(gethostbyname_r
          "int gethostbyname_r(const char *name, struct hostent *hp, char *buf, size_t buflen, struct hostent **result, int *herr)"
          "0"
          "netdb.h"
          EVENT__HAVE_GETHOSTBYNAME_R_6_ARG)
  endif()
  
  if(HAVE_PORT_H AND HAVE_PORT_CREATE)
      set(EVENT__HAVE_EVENT_PORTS 1)
  endif()
  
  CHECK_TYPE_SIZE("struct sockaddr_un" EVENT__HAVE_STRUCT_SOCKADDR_UN)
  CHECK_TYPE_SIZE("uint8_t" EVENT__HAVE_UINT8_T)
  CHECK_TYPE_SIZE("uint16_t" EVENT__HAVE_UINT16_T)
  CHECK_TYPE_SIZE("uint32_t" EVENT__HAVE_UINT32_T)
  CHECK_TYPE_SIZE("uint64_t" EVENT__HAVE_UINT64_T)
  CHECK_TYPE_SIZE("short" EVENT__SIZEOF_SHORT BUILTIN_TYPES_ONLY)
  CHECK_TYPE_SIZE("int" EVENT__SIZEOF_INT BUILTIN_TYPES_ONLY)
  CHECK_TYPE_SIZE("unsigned" EVENT__SIZEOF_UNSIGNED BUILTIN_TYPES_ONLY)
  CHECK_TYPE_SIZE("unsigned int" EVENT__SIZEOF_UNSIGNED_INT BUILTIN_TYPES_ONLY)
  CHECK_TYPE_SIZE("long" EVENT__SIZEOF_LONG BUILTIN_TYPES_ONLY)
  CHECK_TYPE_SIZE("long long" EVENT__SIZEOF_LONG_LONG BUILTIN_TYPES_ONLY)
  
  if(WIN32)
      # These aren't available until Windows Vista.
      # But you can still link them. They just won't be found when running the exe.
      set(EVENT__HAVE_INET_NTOP 0)
      set(EVENT__HAVE_INET_PTON 0)
  endif()
  
  # Check for different inline keyword versions.
  check_function_keywords("inline" "__inline" "__inline__")
  
  if (HAVE_INLINE)
      set(EVENT__inline inline)
  elseif (HAVE___INLINE)
      set(EVENT__inline __inline)
  elseif(HAVE___INLINE__)
      set(EVENT__inline __inline__)
  else()
      set(EVENT__inline)
  endif()
  
  # __func__/__FUNCTION__ is not a macros in general
  CHECK_SYMBOL_EXISTS("__func__"     "" EVENT__HAVE___func__)
  CHECK_SYMBOL_EXISTS("__FUNCTION__" "" EVENT__HAVE___FUNCTION__)
  
  CHECK_CONST_EXISTS(CTL_KERN sys/sysctl.h EVENT__HAVE_DECL_CTL_KERN)
  CHECK_CONST_EXISTS(KERN_ARND sys/sysctl.h EVENT__HAVE_DECL_KERN_ARND)
  CHECK_SYMBOL_EXISTS(F_SETFD fcntl.h EVENT__HAVE_SETFD)
  
  CHECK_TYPE_SIZE(fd_mask EVENT__HAVE_FD_MASK)
  
  CHECK_TYPE_SIZE(size_t EVENT__SIZEOF_SIZE_T)
  if(NOT EVENT__SIZEOF_SIZE_T)
    set(EVENT__SIZEOF_SIZE_T ${EVENT__SIZEOF_UNSIGNED})
  endif()
  
  CHECK_TYPE_SIZE("off_t" EVENT__SIZEOF_OFF_T LANGUAGE C)
  
  
  # XXX we should functionalize these size and type sets. --elley
  
  # Winssck.
  if (_MSC_VER)
      list(APPEND CMAKE_EXTRA_INCLUDE_FILES BaseTsd.h)
  endif()
  CHECK_TYPE_SIZE("ssize_t" EVENT__SIZEOF_SSIZE_T_LOWER LANGUAGE C)
  CHECK_TYPE_SIZE("SSIZE_T" EVENT__SIZEOF_SSIZE_T_UPPER LANGUAGE C)
  
  if (EVENT__SIZEOF_SSIZE_T_LOWER)
      set(EVENT__ssize_t "ssize_t")
  elseif (EVENT__SIZEOF_SSIZE_T_UPPER)
      set(EVENT__ssize_t "SSIZE_T")
  else()
      set(EVENT__ssize_t "int")
  endif()
  
  CHECK_TYPE_SIZE(socklen_t EVENT__SIZEOF_SOCKLEN_T)
  if(NOT EVENT__SIZEOF_SOCKLEN_T)
    set(EVENT__socklen_t "unsigned int")
    set(EVENT__SIZEOF_SOCKLEN_T ${EVENT__SIZEOF_UNSIGNED_INT})
  else()
      set(EVENT__socklen_t "socklen_t")
  endif()
  
  CHECK_TYPE_SIZE(pid_t EVENT__SIZEOF_PID_T)
  if(NOT EVENT__SIZEOF_PID_T)
    set(EVENT__SIZEOF_PID_T ${EVENT__SIZEOF_INT})
  else()
  	set(EVENT__SIZEOF_PID_T EVENT__SIZEOF_PID_T)
  endif()
  
  # we're just getting lazy now.
  CHECK_TYPE_SIZE("uintptr_t" EVENT__HAVE_UINTPTR_T)
  CHECK_TYPE_SIZE("void *" EVENT__SIZEOF_VOID_P)
  CHECK_TYPE_SIZE("time_t" EVENT__SIZEOF_TIME_T)
  
  # Tests file offset bits.
  # TODO: Add AIX test for if -D_LARGE_FILES is needed.
  
  # XXX: Why is this here? we don't even use it. Well, we don't even use it
  #      on top of that, why is it set in the config.h?! IT_MAKES_NO_SENSE
  #      I'm commenting it out for now.
  #      - ellzey
  
  #CHECK_FILE_OFFSET_BITS()
  
  # Verify kqueue works with pipes.
  if (EVENT__HAVE_KQUEUE)
      if (CMAKE_CROSSCOMPILING AND NOT EVENT__FORCE_KQUEUE_CHECK)
          message(WARNING "Cannot check if kqueue works with pipes when crosscompiling.
              Use EVENT__FORCE_KQUEUE_CHECK to be sure (this requires running a test program on the cross compilation target)")
          set(EVENT__HAVE_WORKING_KQUEUE 1)
      elseif (APPLE AND NOT EVENT__FORCE_KQUEUE_CHECK)
          message(WARNING "Cannot check if kqueue works with pipes on macOS.
              Use EVENT__FORCE_KQUEUE_CHECK to be sure (this requires running a test program).")
          set(EVENT__HAVE_WORKING_KQUEUE 1)
      else()
          message(STATUS "Checking if kqueue works with pipes...")
          include(CheckWorkingKqueue)
      endif()
  endif()
  
  if(EVENT__HAVE_NETDB_H)
      list(APPEND CMAKE_EXTRA_INCLUDE_FILES netdb.h)
      CHECK_TYPE_SIZE("struct addrinfo" EVENT__HAVE_STRUCT_ADDRINFO)
  elseif(WIN32)
      list(APPEND CMAKE_EXTRA_INCLUDE_FILES ws2tcpip.h)
      CHECK_TYPE_SIZE("struct addrinfo" EVENT__HAVE_STRUCT_ADDRINFO)
  endif()
  
  # Check for sockaddr structure sizes.
  set(SOCKADDR_HEADERS)
  if (WIN32)
      set(CMAKE_REQUIRED_DEFINITIONS "-DWIN32_LEAN_AND_MEAN")
      if (_MSC_VER LESS 1300)
          set(SOCKADDR_HEADERS winsock.h)
      else()
          set(SOCKADDR_HEADERS winsock2.h ws2tcpip.h)
      endif()
  else()
      if (EVENT__HAVE_NETINET_IN_H)
          set(SOCKADDR_HEADERS ${SOCKADDR_HEADERS} netinet/in.h)
      endif()
  
      if (EVENT__HAVE_NETINET_IN6_H)
          set(SOCKADDR_HEADERS ${SOCKADDR_HEADERS} netinet/in6.h)
      endif()
  
      if (EVENT__HAVE_SYS_SOCKET_H)
          set(SOCKADDR_HEADERS ${SOCKADDR_HEADERS} sys/socket.h)
      endif()
  
      if (EVENT__HAVE_NETDB_H)
          set(SOCKADDR_HEADERS ${SOCKADDR_HEADERS} netdb.h)
      endif()
  endif()
  
  CHECK_TYPE_SIZE("struct in6_addr" EVENT__HAVE_STRUCT_IN6_ADDR)
  
  CHECK_TYPE_SIZE("sa_family_t" EVENT__HAVE_SA_FAMILY_T)
  CHECK_TYPE_SIZE("struct sockaddr_in6" EVENT__HAVE_STRUCT_SOCKADDR_IN6)
  
  if(EVENT__HAVE_STRUCT_SOCKADDR_IN6)
      CHECK_STRUCT_HAS_MEMBER("struct sockaddr_in6"
              sin6_len "${SOCKADDR_HEADERS}"
              EVENT__HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN)
  
      CHECK_STRUCT_HAS_MEMBER("struct sockaddr_in6"
              sin_len "${SOCKADDR_HEADERS}"
              EVENT__HAVE_STRUCT_SOCKADDR_IN_SIN_LEN)
  endif()
  
  CHECK_TYPE_SIZE("struct sockaddr_storage" EVENT__HAVE_STRUCT_SOCKADDR_STORAGE)
  if(EVENT__HAVE_STRUCT_SOCKADDR_STORAGE)
      CHECK_STRUCT_HAS_MEMBER("struct sockaddr_storage"
              ss_family "${SOCKADDR_HEADERS}"
              EVENT__HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY)
  
      CHECK_STRUCT_HAS_MEMBER("struct sockaddr_storage"
              __ss_family "${SOCKADDR_HEADERS}" EVENT__HAVE_STRUCT_SOCKADDR_STORAGE___SS_FAMILY)
  endif()
  
  CHECK_TYPE_SIZE("struct linger" EVENT__HAVE_STRUCT_LINGER)
  
  # Group the source files.
  set(HDR_PRIVATE
      bufferevent-internal.h
      changelist-internal.h
      defer-internal.h
      epolltable-internal.h
      evbuffer-internal.h
      event-internal.h
      evmap-internal.h
      evrpc-internal.h
      evsignal-internal.h
      evthread-internal.h
      evdns-internal.h
      ht-internal.h
      http-internal.h
      iocp-internal.h
      ipv6-internal.h
      log-internal.h
      minheap-internal.h
      mm-internal.h
      ratelim-internal.h
      strlcpy-internal.h
      util-internal.h
      openssl-compat.h
      evconfig-private.h
      sha1.h
      compat/sys/queue.h
      compat/sys/tree.h)
  
  set(HDR_COMPAT
      include/evdns.h
      include/evrpc.h
      include/event.h
      include/evhttp.h
      include/evutil.h)
  
  set(HDR_PUBLIC
      include/event2/buffer.h
      include/event2/bufferevent.h
      include/event2/bufferevent_compat.h
      include/event2/bufferevent_struct.h
      include/event2/buffer_compat.h
      include/event2/dns.h
      include/event2/dns_compat.h
      include/event2/dns_struct.h
      include/event2/event.h
      include/event2/event_compat.h
      include/event2/event_struct.h
      include/event2/watch.h
      include/event2/http.h
      include/event2/http_compat.h
      include/event2/http_struct.h
      include/event2/keyvalq_struct.h
      include/event2/listener.h
      include/event2/rpc.h
      include/event2/rpc_compat.h
      include/event2/rpc_struct.h
      include/event2/tag.h
      include/event2/tag_compat.h
      include/event2/thread.h
      include/event2/util.h
      include/event2/ws.h
      include/event2/visibility.h
      ${PROJECT_BINARY_DIR}/include/event2/event-config.h)
  
  list(APPEND SRC_CORE
      buffer.c
      bufferevent.c
      bufferevent_filter.c
      bufferevent_pair.c
      bufferevent_ratelim.c
      bufferevent_sock.c
      event.c
      evmap.c
      evthread.c
      evutil.c
      evutil_rand.c
      evutil_time.c
      watch.c
      listener.c
      log.c
      signal.c
      strlcpy.c)
  
  if(EVENT__HAVE_SELECT)
      list(APPEND SRC_CORE select.c)
  endif()
  
  if(EVENT__HAVE_POLL)
      list(APPEND SRC_CORE poll.c)
  endif()
  
  if(EVENT__HAVE_KQUEUE)
      list(APPEND SRC_CORE kqueue.c)
  endif()
  
  if(EVENT__HAVE_DEVPOLL)
      list(APPEND SRC_CORE devpoll.c)
  endif()
  
  if(EVENT__HAVE_EPOLL)
      list(APPEND SRC_CORE epoll.c)
  endif()
  
  if(EVENT__HAVE_SIGNALFD)
      list(APPEND SRC_CORE signalfd.c)
  endif()
  
  if(EVENT__HAVE_WEPOLL)
      list(APPEND SRC_CORE
          epoll.c
          wepoll.c)
  endif()
  
  if(EVENT__HAVE_EVENT_PORTS)
      list(APPEND SRC_CORE evport.c)
  endif()
  
  if (EVENT__DISABLE_OPENSSL STREQUAL "OFF" OR EVENT__DISABLE_OPENSSL STREQUAL "AUTO")
      # only if OPENSSL_ROOT_DIR is not set yet
      if (BREW AND NOT OPENSSL_ROOT_DIR AND NOT "$ENV{OPENSSL_ROOT_DIR}")
          execute_process(COMMAND ${BREW} --prefix openssl
              OUTPUT_VARIABLE BREW_OPENSSL_PREFIX
              RESULT_VARIABLE BREW_OPENSSL_RESULT
              ERROR_QUIET
              OUTPUT_STRIP_TRAILING_WHITESPACE
          )
          if (BREW_OPENSSL_RESULT EQUAL 0)
              message(STATUS "Set OPENSSL_ROOT_DIR=${BREW_OPENSSL_PREFIX} (from brew)")
              set(OPENSSL_ROOT_DIR "${BREW_OPENSSL_PREFIX}" CACHE PATH "")
          endif()
      endif()
  
      find_package(OpenSSL)
  
      if (OPENSSL_FOUND)
          set(EVENT__HAVE_OPENSSL 1)
          set(OPENSSL_TARGETS OpenSSL::SSL)
  
          message(STATUS "OpenSSL include: ${OPENSSL_INCLUDE_DIR}")
          message(STATUS "OpenSSL lib: ${OPENSSL_LIBRARIES}")
  
          list(APPEND SRC_OPENSSL bufferevent_openssl.c bufferevent_ssl.c)
          list(APPEND HDR_PUBLIC include/event2/bufferevent_ssl.h)
          list(APPEND LIB_APPS ${OPENSSL_TARGETS})
      elseif (EVENT__DISABLE_OPENSSL STREQUAL "OFF")
          message(FATAL_ERROR "OpenSSL required, but not found.")
      endif()
  elseif (EVENT__DISABLE_OPENSSL STREQUAL "ON")
      message(STATUS "Disable OpenSSL support")
  else()
      message(FATAL_ERROR "EVENT__DISABLE_OPENSSL must be set to one of: AUTO, ON or OFF")
  endif()
  
  if (EVENT__DISABLE_MBEDTLS STREQUAL "OFF" OR EVENT__DISABLE_MBEDTLS STREQUAL "AUTO")
      # only if MBEDTLS_ROOT_DIR is not set yet
      if (BREW AND NOT MBEDTLS_ROOT_DIR AND NOT "$ENV{MBEDTLS_ROOT_DIR}")
          execute_process(COMMAND ${BREW} --prefix mbedtls
              OUTPUT_VARIABLE BREW_MBEDTLS_PREFIX
              RESULT_VARIABLE BREW_MBEDTLS_RESULT
              ERROR_QUIET
              OUTPUT_STRIP_TRAILING_WHITESPACE
          )
          if (BREW_MBEDTLS_RESULT EQUAL 0)
              message(STATUS "Set MBEDTLS_ROOT_DIR=${BREW_MBEDTLS_PREFIX} (from brew)")
              set(MBEDTLS_ROOT_DIR "${BREW_MBEDTLS_PREFIX}" CACHE PATH "")
          endif()
      endif()
  
      find_package(MbedTLS)
  
      if (MBEDTLS_FOUND)
          set(EVENT__HAVE_MBEDTLS 1)
          set(MBEDTLS_TARGETS MbedTLS::mbedtls MbedTLS::mbedcrypto MbedTLS::mbedx509)
  
          message(STATUS "mbed TLS include: ${MBEDTLS_INCLUDE_DIR}")
          message(STATUS "mbed TLS lib: ${MBEDTLS_LIBRARIES}")
  
          list(APPEND SRC_MBEDTLS bufferevent_mbedtls.c bufferevent_ssl.c)
          list(APPEND HDR_PUBLIC include/event2/bufferevent_ssl.h)
          list(APPEND LIB_APPS ${MBEDTLS_TARGETS})
      elseif (EVENT__DISABLE_MBEDTLS STREQUAL "OFF")
          message(FATAL_ERROR "MbedTLS required, but not found.")
      endif()
  elseif (EVENT__DISABLE_MBEDTLS STREQUAL "ON")
      message(STATUS "Disable MbedTLS support")
  else()
      message(FATAL_ERROR "EVENT__DISABLE_MBEDTLS must be set to one of: AUTO, ON or OFF")
  endif()
  
  if (NOT EVENT__DISABLE_TESTS)
      # Zlib is only used for testing.
      find_package(ZLIB)
  
      if (ZLIB_LIBRARY AND ZLIB_INCLUDE_DIR)
          set(EVENT__HAVE_LIBZ 1)
          list(APPEND LIB_APPS ZLIB::ZLIB)
      endif()
  endif()
  
  set(SRC_EXTRA
      event_tagging.c
      http.c
      evdns.c
      ws.c
      sha1.c
      evrpc.c)
  
  if(${CMAKE_VERSION} VERSION_LESS "3.20")
    include(TestBigEndian)
    TEST_BIG_ENDIAN(IS_BIG_ENDIAN)
    if(IS_BIG_ENDIAN)
      set(CMAKE_C_BYTE_ORDER BIG_ENDIAN)
    else()
      set(CMAKE_C_BYTE_ORDER LITTLE_ENDIAN)
    endif()
  endif()
  set_source_files_properties(sha1.c PROPERTIES COMPILE_FLAGS
      -D${CMAKE_C_BYTE_ORDER}=1)
  add_definitions(-DHAVE_CONFIG_H)
  
  # We use BEFORE here so we don't accidentally look in system directories
  # first for some previous versions of the headers that are installed.
  include_directories(BEFORE ${PROJECT_SOURCE_DIR}
      ${PROJECT_SOURCE_DIR}/compat
      ${PROJECT_SOURCE_DIR}/include)
  
  if(WIN32)
      list(APPEND SRC_CORE
          buffer_iocp.c
          bufferevent_async.c
          event_iocp.c
          win32select.c)
  
      list(APPEND HDR_PRIVATE WIN32-Code/getopt.h)
  
      set(LIB_PLATFORM ws2_32 shell32 advapi32 bcrypt iphlpapi)
      add_definitions(
              -D_CRT_SECURE_NO_WARNINGS
              -D_CRT_NONSTDC_NO_DEPRECATE)
  
      include_directories(./WIN32-Code)
  endif()
  
  if (SOLARIS)
      list(APPEND LIB_PLATFORM socket nsl)
  endif()
  
  source_group("Headers Private"  FILES ${HDR_PRIVATE})
  source_group("Header Compat"    FILES ${HDR_COMPAT})
  source_group("Headers Public"   FILES ${HDR_PUBLIC})
  source_group("Source Core"      FILES ${SRC_CORE})
  source_group("Source Extra"     FILES ${SRC_EXTRA})
  
  # Generate the configure headers.
  # (Place them in the build dir so we don't polute the source tree with generated files).
  include_directories(BEFORE ${CMAKE_CURRENT_BINARY_DIR}/include)
  
  if (${GNUC})
      set(EVENT_SHARED_FLAGS -fvisibility=hidden)
  elseif ("${CMAKE_C_COMPILER_ID}" STREQUAL "SunPro")
      set(EVENT_SHARED_FLAGS -xldscope=hidden)
  endif()
  
  configure_file(
      ${CMAKE_CURRENT_SOURCE_DIR}/event-config.h.cmake
      ${CMAKE_CURRENT_BINARY_DIR}/include/event2/event-config.h
          NEWLINE_STYLE UNIX)
  
  configure_file(
      ${CMAKE_CURRENT_SOURCE_DIR}/evconfig-private.h.cmake
      ${CMAKE_CURRENT_BINARY_DIR}/include/evconfig-private.h)
  
  #
  # Create the libraries.
  #
  include(AddEventLibrary)
  add_event_library(event_core SOURCES ${SRC_CORE})
  add_event_library(event_extra
      INNER_LIBRARIES event_core
      SOURCES ${SRC_EXTRA})
  
  if (EVENT__HAVE_OPENSSL)
      add_event_library(event_openssl
          INNER_LIBRARIES event_core
          LIBRARIES ${OPENSSL_TARGETS}
          SOURCES ${SRC_OPENSSL})
  endif()
  
  if (EVENT__HAVE_MBEDTLS)
      add_event_library(event_mbedtls
          INNER_LIBRARIES event_core
          LIBRARIES ${MBEDTLS_TARGETS}
          SOURCES ${SRC_MBEDTLS})
  endif()
  
  if (EVENT__HAVE_PTHREADS)
      set(SRC_PTHREADS evthread_pthread.c)
      if(ANDROID)
          add_event_library(event_pthreads
              INNER_LIBRARIES event_core
              SOURCES ${SRC_PTHREADS})
      else()
          add_event_library(event_pthreads
              INNER_LIBRARIES event_core
              LIBRARIES Threads::Threads
              SOURCES ${SRC_PTHREADS})
      endif()
  endif()
  
  # library exists for historical reasons; it contains the contents of
  # both libevent_core and libevent_extra. You shouldn’t use it; it may
  # go away in a future version of Libevent.
  add_event_library(event SOURCES ${SRC_CORE} ${SRC_EXTRA})
  
  set(WIN32_GETOPT)
  if (WIN32)
      set(_TMPLIBS)
      if (${EVENT_LIBRARY_STATIC})
          list(APPEND _TMPLIBS event_core_static event_static)
      endif()
      if (${EVENT_LIBRARY_SHARED})
          list(APPEND _TMPLIBS event_core_shared event_shared)
      endif()
      foreach(lib ${_TMPLIBS})
          target_link_libraries(${lib} iphlpapi)
      endforeach()
      unset(_TMPLIBS)
  
      list(APPEND WIN32_GETOPT
           WIN32-Code/getopt.c
           WIN32-Code/getopt_long.c)
  endif()
  
  #
  # Samples.
  #
  macro(add_sample_prog ssl name)
      add_executable(${name} ${ARGN})
  
      target_link_libraries(${name}
                            event_extra
                            event_core
                            ${LIB_APPS}
                            ${LIB_PLATFORM})
  
      if (TARGET ${ssl})
          target_link_libraries(${name} ${ssl})
          if(WIN32)
              target_link_libraries(${name} crypt32)
          endif()
      endif()
  endmacro()
  if (NOT EVENT__DISABLE_SAMPLES)
      set(SAMPLES
          event-read-fifo
          hello-world
          signal-test
          http-connect
          time-test
          watch-timing)
  
      foreach(SAMPLE ${SAMPLES})
          add_sample_prog(OFF ${SAMPLE} sample/${SAMPLE}.c)
      endforeach()
      if (NOT WIN32)
          target_link_libraries(watch-timing m)
      endif()
  
      if (EVENT__HAVE_OPENSSL)
          add_sample_prog(event_openssl https-client
                          sample/https-client.c
                          sample/openssl_hostname_validation.c
                          sample/hostcheck.c)
          add_sample_prog(event_openssl le-proxy
                          sample/le-proxy.c)
          add_sample_prog(event_openssl becat sample/becat.c ${WIN32_GETOPT})
      endif()
  
      if (EVENT__HAVE_MBEDTLS)
          add_sample_prog(event_mbedtls https-client-mbedtls
                  sample/https-client.c)
          target_compile_definitions(https-client-mbedtls PRIVATE USE_MBEDTLS)
          add_sample_prog(event_mbedtls ssl-client-mbedtls
                  sample/ssl-client-mbedtls.c)
      endif()
  
      set(SAMPLES_WOPT
          dns-example
          ws-chat-server
          http-server
      )
      foreach (SAMPLE ${SAMPLES_WOPT})
          add_sample_prog(OFF ${SAMPLE} sample/${SAMPLE}.c ${WIN32_GETOPT})
      endforeach()
  endif()
  
  #
  # Benchmarks
  #
  macro(add_bench_prog prog)
      add_executable(${prog} ${ARGN})
      target_link_libraries(${prog}
                            event_extra
                            event_core
                            ${LIB_APPS}
                            ${LIB_PLATFORM})
  endmacro()
  if (NOT EVENT__DISABLE_BENCHMARK)
      foreach (BENCHMARK bench_http bench_httpclient)
          add_bench_prog(${BENCHMARK} test/${BENCHMARK}.c)
      endforeach()
  
      add_bench_prog(bench test/bench.c ${WIN32_GETOPT})
      add_bench_prog(bench_cascade test/bench_cascade.c ${WIN32_GETOPT})
  endif()
  
  #
  # Tests
  #
  macro(add_test_prog prog)
      add_executable(${prog} test/${prog}.c)
      target_link_libraries(${prog}
                            ${LIB_APPS}
                            ${LIB_PLATFORM}
                            event_core
                            event_extra
                            ${ARGN})
  endmacro()
  
  if (NOT EVENT__DISABLE_TESTS)
      #
      # Generate Regress tests.
      #
      if (NOT EVENT__DISABLE_REGRESS)
          # (We require python to generate the regress tests)
          find_package(Python3 COMPONENTS Interpreter)
  
          if (Python3_FOUND)
              set(__FOUND_USABLE_PYTHON 1)
              set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
          else()
              find_package(Python2 COMPONENTS Interpreter)
              if (Python2_FOUND)
                  set(__FOUND_USABLE_PYTHON 1)
                  set(PYTHON_EXECUTABLE ${Python2_EXECUTABLE})
              else()
                  message(ERROR "No suitable Python version found, bailing...")
              endif()
          endif()
  
          if (__FOUND_USABLE_PYTHON)
              message(STATUS "Generating regress tests...")
  
              add_definitions(-DTINYTEST_LOCAL)
  
              add_custom_command(
                  OUTPUT
                      ${CMAKE_CURRENT_SOURCE_DIR}/test/regress.gen.c
                      ${CMAKE_CURRENT_SOURCE_DIR}/test/regress.gen.h
                  DEPENDS
                      event_rpcgen.py
                      test/regress.rpc
                  COMMAND ${PYTHON_EXECUTABLE} ../event_rpcgen.py --quiet regress.rpc
                  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/test)
  
              list(APPEND SRC_REGRESS
                   test/regress.c
                   test/regress.gen.c
                   test/regress.gen.h
                   test/regress_buffer.c
                   test/regress_bufferevent.c
                   test/regress_dns.c
                   test/regress_et.c
                   test/regress_finalize.c
                   test/regress_http.c
                   test/regress_http.h
                   test/regress_listener.c
                   test/regress_main.c
                   test/regress_minheap.c
                   test/regress_rpc.c
                   test/regress_testutils.c
                   test/regress_testutils.h
                   test/regress_util.c
                   test/regress_watch.c
                   test/regress_timer_timeout.c
                   test/regress_ws.c
                   test/regress_ws.h
                   test/tinytest.c)
  
              if (WIN32)
                  list(APPEND SRC_REGRESS test/regress_iocp.c)
                  if (NOT EVENT__DISABLE_THREAD_SUPPORT)
                      list(APPEND SRC_REGRESS test/regress_thread.c)
                  endif()
              elseif (EVENT__HAVE_PTHREADS)
                  list(APPEND SRC_REGRESS test/regress_thread.c)
              endif()
  
              if (ZLIB_LIBRARY AND ZLIB_INCLUDE_DIR)
                  list(APPEND SRC_REGRESS test/regress_zlib.c)
              endif()
  
              if (EVENT__HAVE_OPENSSL)
                  list(APPEND SRC_REGRESS test/regress_openssl.c)
              endif()
  
              if (EVENT__HAVE_MBEDTLS)
                  list(APPEND SRC_REGRESS test/regress_mbedtls.c)
              endif()
  
              add_executable(regress ${SRC_REGRESS})
  
              target_link_libraries(regress
                                    ${LIB_APPS}
                                    ${LIB_PLATFORM}
                                    event_core
                                    event_extra)
              if (EVENT__HAVE_OPENSSL)
                  target_link_libraries(regress event_openssl)
              endif()
              if (EVENT__HAVE_MBEDTLS)
                  target_link_libraries(regress event_mbedtls)
              endif()
              if (PTHREADS_AVAILABLE)
                  target_link_libraries(regress event_pthreads)
              endif()
          else()
              message(WARNING "No suitable Python interpreter found, cannot generate regress tests!")
          endif()
      endif()
  
      #
      # Test programs.
      #
      # all of these, including the cmakelists.txt should be moved
      # into the dirctory 'tests' first.
      #
      # doing this, we can remove all the DISABLE_TESTS stuff, and simply
      # do something like:
      #
      # add_custom_targets(tests)
      # add_executable(... EXCLUDE_FROM_ALL ...c)
      # add_dependencis(tests testa testb testc)
      # add_test(....)
      #
      # then you can just run 'make tests' instead of them all
      # auto-compile|running
      # - ellzey
      set(TESTPROGS test-changelist
                    test-eof
                    test-closed
                    test-fdleak
                    test-init
                    test-time
                    test-weof)
  
      foreach (TESTPROG ${TESTPROGS} test-dumpevents)
          add_test_prog(${TESTPROG})
      endforeach()
      if (UNIX)
          add_test_prog(test-ratelim m)
      else()
          add_test_prog(test-ratelim)
      endif()
  
      set(ALL_TESTPROGS
          ${TESTPROGS}
          test-dumpevents
          test-ratelim
      )
  
      if(PTHREADS_AVAILABLE AND EVENT__HAVE_KQUEUE)
          add_test_prog(test-kq-collision event_pthreads)
          list(APPEND ALL_TESTPROGS test-kq-collision)
          add_test(test-test-kq-collision ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/test-kq-collision)
      endif()
  
      #
      # We run all tests with the different backends turned on one at a time.
      #
  
      # Add event backends based on system introspection result.
      set(BACKENDS "")
  
      if (EVENT__HAVE_EPOLL)
          list(APPEND BACKENDS EPOLL)
      endif()
  
      if (EVENT__HAVE_SELECT)
          list(APPEND BACKENDS SELECT)
      endif()
  
      if (EVENT__HAVE_POLL)
          list(APPEND BACKENDS POLL)
      endif()
  
      if (EVENT__HAVE_KQUEUE)
          list(APPEND BACKENDS KQUEUE)
      endif()
  
      if (EVENT__HAVE_EVENT_PORTS)
          list(APPEND BACKENDS EVPORT)
      endif()
  
      if (EVENT__HAVE_DEVPOLL)
          list(APPEND BACKENDS DEVPOLL)
      endif()
  
      if (EVENT__HAVE_WEPOLL)
          list(APPEND BACKENDS WEPOLL)
      endif()
  
      if (WIN32)
          list(APPEND BACKENDS WIN32)
      endif()
  
  
      # Default environment variables turns off all event systems,
      # then we enable each one, one at a time when creating the tests.
      set(DEFAULT_TEST_ENV_VARS)
      foreach(BACKEND ${BACKENDS})
          set(BACKEND_ENV_VAR "EVENT_NO${BACKEND}=1")
          list(APPEND DEFAULT_TEST_ENV_VARS "${BACKEND_ENV_VAR}")
      endforeach()
  
      # Macro that creates the ctest test for a backend.
      macro(add_backend_test BACKEND_TEST_NAME ENV_VARS)
          set(TEST_NAMES "")
  
          foreach (TESTPROG ${TESTPROGS})
              set(TEST_NAME ${TESTPROG}__${BACKEND_TEST_NAME})
  
              add_test(${TEST_NAME}
                       ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TESTPROG})
  
              list(APPEND TEST_NAMES ${TEST_NAME})
  
              set_tests_properties(${TEST_NAME}
                                   PROPERTIES ENVIRONMENT "${ENV_VARS}")
          endforeach()
  
          # Dump events test.
          if (__FOUND_USABLE_PYTHON)
              set(TEST_NAME test-dumpevents__${BACKEND_TEST_NAME})
  
              add_test(${TEST_NAME}
                       ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/test-dumpevents |
                       ${PYTHON_EXECUTABLE}
                       ${CMAKE_CURRENT_SOURCE_DIR}/test/check-dumpevents.py)
  
              set_tests_properties(${TEST_NAME}
                                   PROPERTIES ENVIRONMENT "${ENV_VARS}")
          else()
              message(WARNING "test-dumpevents will be run without output check since python was not found!")
              set(TEST_NAME test-dumpevents__${BACKEND_TEST_NAME}_no_check)
  
              add_test(${TEST_NAME}
                       ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/test-dumpevents)
  
              set_tests_properties(${TEST_NAME}
                                   PROPERTIES ENVIRONMENT "${ENV_VARS}")
          endif()
  
          # Regress tests.
          if (NOT EVENT__DISABLE_REGRESS AND __FOUND_USABLE_PYTHON)
              set(TEST_NAME regress__${BACKEND_TEST_NAME})
  
              add_test(${TEST_NAME}
                       ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/regress --quiet)
  
              set_tests_properties(${TEST_NAME}
                                   PROPERTIES ENVIRONMENT "${ENV_VARS}")
  
              add_test(${TEST_NAME}_debug
                       ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/regress --quiet)
  
              set_tests_properties(${TEST_NAME}_debug
                                   PROPERTIES ENVIRONMENT "${ENV_VARS};EVENT_DEBUG_MODE=1")
          endif()
      endmacro()
  
      # Add the tests for each backend.
      foreach(BACKEND ${BACKENDS})
          # Enable this backend only.
          set(BACKEND_ENV_VARS ${DEFAULT_TEST_ENV_VARS})
          list(REMOVE_ITEM BACKEND_ENV_VARS EVENT_NO${BACKEND}=1)
  
          # Epoll has some extra settings.
          if (${BACKEND} STREQUAL "EPOLL")
              add_backend_test(timerfd_${BACKEND}
                              "${BACKEND_ENV_VARS};EVENT_PRECISE_TIMER=1")
  
              add_backend_test(changelist_${BACKEND}
                              "${BACKEND_ENV_VARS};EVENT_EPOLL_USE_CHANGELIST=yes")
  
              add_backend_test(timerfd_changelist_${BACKEND}
                              "${BACKEND_ENV_VARS};EVENT_EPOLL_USE_CHANGELIST=yes;EVENT_PRECISE_TIMER=1")
          else()
              add_backend_test(${BACKEND} "${BACKEND_ENV_VARS}")
          endif()
          add_backend_test(signalfd_${BACKEND} "${BACKEND_ENV_VARS};EVENT_USE_SIGNALFD=1")
      endforeach()
  
      #
      # Rate limiter tests.
      #
  
      # Group limits, no connection limit.
      set(RL_BIN ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/test-ratelim)
  
      add_test(test-ratelim__group_lim
               ${RL_BIN}
               -g 30000
               -n 30
               -t 100
               --check-grouplimit 1000
               --check-stddev 100)
  
      # Connection limit, no group limit.
      add_test(test-ratelim__con_lim
               ${RL_BIN}
               -c 1000
               -n 30
               -t 100
               --check-connlimit 50
               --check-stddev 50)
  
      # Connection limit and group limit.
      add_test(test-ratelim__group_con_lim
               ${RL_BIN}
               -c 1000
               -g 30000
               -n 30
               -t 100
               --check-grouplimit 1000
               --check-connlimit 50
               --check-stddev 50)
  
      # Connection limit and group limit with independent drain.
      add_test(test-ratelim__group_con_lim_drain
               ${RL_BIN}
               -c 1000
               -g 35000
               -n 30
               -t 100
               -G 500
               --check-grouplimit 1000
               --check-connlimit 50
               --check-stddev 50)
  
      # Add a "make verify" target, same as for autoconf.
      # (Important! This will unset all EVENT_NO* environment variables.
      #  If they are set in the shell the tests are running using simply "ctest" or "make test" will fail)
      if (WIN32)
          # Windows doesn't have "unset". But you can use "set VAR=" instead.
          file(TO_NATIVE_PATH ${CMAKE_CTEST_COMMAND} WINDOWS_CTEST_COMMAND)
  
          file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/tmp/verify_tests.bat
              "
              set EVENT_NOWIN32=
              set EVENT_NOWEPOLL=
              \"${WINDOWS_CTEST_COMMAND}\"
              ")
  
          message(STATUS "${WINDOWS_CTEST_COMMAND}")
  
          file(COPY ${CMAKE_CURRENT_BINARY_DIR}/tmp/verify_tests.bat
               DESTINATION ${CMAKE_CURRENT_BINARY_DIR}
               FILE_PERMISSIONS
                               OWNER_READ
                               OWNER_WRITE
                               OWNER_EXECUTE
                               GROUP_READ
                               GROUP_EXECUTE
                               WORLD_READ WORLD_EXECUTE)
  
          file(TO_NATIVE_PATH
                      "${CMAKE_CURRENT_BINARY_DIR}/verify_tests.bat" VERIFY_PATH)
  
          add_custom_target(verify COMMAND "${VERIFY_PATH}"
                            DEPENDS event ${ALL_TESTPROGS})
      else()
          # On some platforms doing exec(unset) as CMake doesn't work, so make sure
          # we run the unset command in a shell instead.
          # First we write the script contents.
          file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/tmp/verify_tests.sh
              "
              #!/bin/bash
              unset EVENT_NOEPOLL; unset EVENT_NOPOLL; unset EVENT_NOSELECT; unset EVENT_NOWIN32; unset EVENT_NOEVPORT; unset EVENT_NOKQUEUE; unset EVENT_NODEVPOLL
              ${CMAKE_CTEST_COMMAND}
              ")
  
          # Then we copy the file (this allows us to set execute permission on it)
          file(COPY ${CMAKE_CURRENT_BINARY_DIR}/tmp/verify_tests.sh
               DESTINATION ${CMAKE_CURRENT_BINARY_DIR}
               FILE_PERMISSIONS
                               OWNER_READ
                               OWNER_WRITE
                               OWNER_EXECUTE
                               GROUP_READ
                               GROUP_EXECUTE
                               WORLD_READ
                               WORLD_EXECUTE)
  
          # Create the target that runs the script.
          add_custom_target(verify
                            COMMAND ${CMAKE_CURRENT_BINARY_DIR}/verify_tests.sh
                            DEPENDS event ${ALL_TESTPROGS})
      endif()
  
      if (NOT EVENT__DISABLE_REGRESS AND __FOUND_USABLE_PYTHON)
          add_dependencies(verify regress)
      endif()
  
      if (EVENT__COVERAGE)
          include(CodeCoverage)
  
          setup_target_for_coverage(
              verify_coverage # Coverage target name "make verify_coverage"
              make            # Test runner.
              coverage        # Output directory.
              verify)         # Arguments passed to test runner. "make verify"
      endif()
  
      enable_testing()
  
      include(CTest)
  endif()
  
  #
  # Installation preparation.
  #
  
  set(EVENT_INSTALL_CMAKE_DIR
      "${CMAKE_INSTALL_LIBDIR}/cmake/libevent")
  
  export(PACKAGE libevent)
  
  configure_file(${PROJECT_SOURCE_DIR}/cmake/LibeventConfig.cmake.in
      "${PROJECT_BINARY_DIR}/LibeventConfig.cmake"
      @ONLY)
  
  # Generate the config file for the build-tree.
  set(EVENT__INCLUDE_DIRS
      "${PROJECT_SOURCE_DIR}/include"
      "${PROJECT_BINARY_DIR}/include")
  
  set(LIBEVENT_INCLUDE_DIRS
      ${EVENT__INCLUDE_DIRS}
      CACHE PATH "Libevent include directories")
  
  # Generate version info for both build-tree and install-tree.
  configure_file(${PROJECT_SOURCE_DIR}/cmake/LibeventConfigVersion.cmake.in
                 ${PROJECT_BINARY_DIR}/LibeventConfigVersion.cmake
                 @ONLY)
  
  # Install compat headers
  install(FILES ${HDR_COMPAT}
          DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
          COMPONENT dev)
  
  # Install public headers
  install(FILES ${HDR_PUBLIC}
          DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/event2"
          COMPONENT dev)
  
  # Install the configs.
  install(FILES
          ${PROJECT_BINARY_DIR}/LibeventConfig.cmake
          ${PROJECT_BINARY_DIR}/LibeventConfigVersion.cmake
          DESTINATION "${EVENT_INSTALL_CMAKE_DIR}"
          COMPONENT dev)
  
  # Install exports for the install-tree.
  macro(install_export type)
      install(EXPORT LibeventTargets-${type}
          NAMESPACE ${PROJECT_NAME}::
          DESTINATION "${EVENT_INSTALL_CMAKE_DIR}"
          COMPONENT dev)
  endmacro()
  
  if (${EVENT_LIBRARY_STATIC})
      install_export(static)
  endif()
  if (${EVENT_LIBRARY_SHARED})
      install_export(shared)
  endif()
  
  # Install the scripts.
  install(PROGRAMS
         ${CMAKE_CURRENT_SOURCE_DIR}/event_rpcgen.py
         DESTINATION "${CMAKE_INSTALL_BINDIR}"
         COMPONENT runtime)
  
  # Create documents with doxygen.
  option(EVENT__DOXYGEN
      "Enables doxygen documentation" OFF)
  if (EVENT__DOXYGEN)
      include(UseDoxygen)
      UseDoxygen()
  endif()
  
  
  if (NOT TARGET uninstall)
  	# Create the uninstall target.
  	# https://gitlab.kitware.com/cmake/community/wikis/FAQ#can-i-do-make-uninstall-with-cmake
  	configure_file(${PROJECT_SOURCE_DIR}/cmake/Uninstall.cmake.in
  				   ${PROJECT_BINARY_DIR}/Uninstall.cmake
  				   @ONLY)
  
  	add_custom_target(uninstall
  					  COMMAND ${CMAKE_COMMAND} -P ${PROJECT_BINARY_DIR}/Uninstall.cmake)
  endif()
  
  message(STATUS "")
  message(STATUS "        ---( Libevent " ${EVENT_VERSION} " )---")
  message(STATUS "")
  message(STATUS "Available event backends: ${BACKENDS}")
  message(STATUS "CMAKE_BINARY_DIR:         ${CMAKE_BINARY_DIR}")
  message(STATUS "CMAKE_CURRENT_BINARY_DIR: ${CMAKE_CURRENT_BINARY_DIR}")
  message(STATUS "CMAKE_SOURCE_DIR:         ${CMAKE_SOURCE_DIR}")
  message(STATUS "CMAKE_CURRENT_SOURCE_DIR: ${CMAKE_CURRENT_SOURCE_DIR}")
  message(STATUS "PROJECT_BINARY_DIR:       ${PROJECT_BINARY_DIR}")
  message(STATUS "PROJECT_SOURCE_DIR:       ${PROJECT_SOURCE_DIR}")
  message(STATUS "CMAKE_MODULE_PATH:        ${CMAKE_MODULE_PATH}")
  message(STATUS "CMAKE_COMMAND:            ${CMAKE_COMMAND}")
  message(STATUS "CMAKE_ROOT:               ${CMAKE_ROOT}")
  message(STATUS "CMAKE_SYSTEM:             ${CMAKE_SYSTEM}")
  message(STATUS "CMAKE_SYSTEM_NAME:        ${CMAKE_SYSTEM_NAME}")
  message(STATUS "CMAKE_SYSTEM_VERSION:     ${CMAKE_SYSTEM_VERSION}")
  message(STATUS "CMAKE_SYSTEM_PROCESSOR:   ${CMAKE_SYSTEM_PROCESSOR}")
  message(STATUS "CMAKE_SKIP_RPATH:         ${CMAKE_SKIP_RPATH}")
  message(STATUS "CMAKE_SKIP_INSTALL_RPATH: ${CMAKE_SKIP_INSTALL_RPATH}")
  message(STATUS "CMAKE_INSTALL_RPATH:      ${CMAKE_INSTALL_RPATH}")
  message(STATUS "CMAKE_VERBOSE_MAKEFILE:   ${CMAKE_VERBOSE_MAKEFILE}")
  message(STATUS "CMAKE_C_FLAGS:            ${CMAKE_C_FLAGS}")
  message(STATUS "CMAKE_BUILD_TYPE:         ${CMAKE_BUILD_TYPE}")
  message(STATUS "CMAKE_C_COMPILER:         ${CMAKE_C_COMPILER} (id ${CMAKE_C_COMPILER_ID}, clang ${CLANG}, GNUC ${GNUC}, version ${CMAKE_C_COMPILER_VERSION})")
  message(STATUS "CMAKE_SHARED_LINKER_FLAGS:${CMAKE_SHARED_LINKER_FLAGS}")
  message(STATUS "CMAKE_EXE_LINKER_FLAGS:   ${CMAKE_EXE_LINKER_FLAGS}")
  message(STATUS "CMAKE_AR:                 ${CMAKE_AR}")
  message(STATUS "CMAKE_RANLIB:             ${CMAKE_RANLIB}")
  message(STATUS "CMAKE_INSTALL_PREFIX:     ${CMAKE_INSTALL_PREFIX}")
  message(STATUS "CMAKE_DEBUG_POSTFIX:      ${CMAKE_DEBUG_POSTFIX}")
  message(STATUS "")
  
  

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