###############################################################################
#
# Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
# more contributor license agreements.  See the NOTICE file distributed
# with this work for additional information regarding copyright ownership.
# Accellera 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.
#
###############################################################################

###############################################################################
#
# CMakeLists.txt --
# Top-level CMake script to configure the SystemC sources and to generate
# native Makefiles and project workspaces for your compiler environment.
#
# Original Author: Torsten Maehne, Université Pierre et Marie Curie, Paris,
#                  2013-06-11
#
###############################################################################

###############################################################################
#
# MODIFICATION LOG - modifiers, enter your name, affiliation, date and
# changes you are making here.
#
#     Name, Affiliation, Date: Guillaume Delbergue, GreenSocs, 08 Mar, 2016
# Description of Modification: Extract SystemC/TLM version and date
#
###############################################################################

###############################################################################
#
# This CMake build script <http://www.cmake.org/> was developed taking the
# original autotools-based build system of the Accellera SystemC distribution
# as a reference. However, it is less restrictive regarding the supported
# OS/processor/compiler combinations by detecting the actual features provided
# by the target (Unix or Windows) platform. On Unix (including OS X),
# shared libraries can be built. If the QuickThreads library provides support
# for the target processor, it will be automatically used. Otherwise, we rely
# on Pthreads on Unix and Fiber on Windows. By default, the SystemC library
# installation will follow the GNU standard installation layout so that also
# other SystemC libraries (SystemC, SCV, TLM, AMS extensions) can be installed
# into the same directory hierarchy (Unix: /opt/systemc/;
# Windows: $ENV{ProgramFiles}/SystemC/). The target platform's conventions are
# respected meaning usually include/ for the headers and lib/, lib64/, or
# lib/<multiarch-tuple>/ for the libraries. The lib-${SystemC_TARGET_ARCH})/
# convention is not used by default, as ${SystemC_TARGET_ARCH} does not
# reliably encode the OS/processor/compiler tuple.
#
# The CMake build scripts are compatible with CMake >=2.8.5 and have been tested
# on the following OS/processor/compiler platforms:
#
# - Linux (GCC, Clang): i386, x86_64
#
# - Linux (GCC): aarch64
#
# - macOS >= 11.6 (Xcode/AppleClang): arm64, x86_64
#
# - Windows (MingW32 GCC + optionally MSYS): x86
#
# Currently untested, but considered by the build script (based on the
# autotools scripts) are:
#
# - *BSD (GCC, Clang): i386, x86_64
#
# - Linux (Clang): aarch64
#
# - Windows (Cygwin GCC, MingW32 GCC, Visual C++): x86, AMD64
#
# The build process can be configured through the configuration variables
# offered to the user in the CMake console and GUI (ccmake and cmake-gui,
# respectively). Each variable is annotated with a brief documentation string.
# The most important variables are:
#
# BUILD_SHARED_LIBS             Build shared instead of static libraries
#                               (default: ON if not targetting Windows).
#
# BUILD_SOURCE_DOCUMENTATION    Build source code documentation using Doxygen
#                               (default: OFF).
#
# CMAKE_BUILD_TYPE              Specifies the build type on single-configuration
#                               generators. (default: Release).
#
# CMAKE_INSTALL_PREFIX          Root directory of the SystemC libraries
#                               installation (defaults to $ENV{SYSTEMC_HOME}
#                               if set to an absolute path and otherwise to either
#                               /opt/systemc/ (Unix-like platforms including
#                               CYGWIN), $ENV{ProgramFiles}/SystemC/ (on Windows
#                               systems), or ${CMAKE_INSTALL_PREFIX}/systemc.
#
# CMAKE_OSX_ARCHITECTURES       Architectures for cross-compilation on Mac OS X
#                               (default: empty, i.e., only for the system
#                               processor).
#
# CMAKE_VERBOSE_MAKEFILE        Generate a verbose Makefile (default: OFF).
#
# DISABLE_COPYRIGHT_MESSAGE     Do not print the copyright message when starting
#                               the application. (default: OFF)
#
# ENABLE_ASSERTIONS             Always enable the `sc_assert' expressions
#                               (default: ON)
#
# ENABLE_PTHREADS               Use POSIX threads for SystemC processes instead
#                               of QuickThreads on Unix or Fiber on Windows.
#
# OVERRIDE_DEFAULT_STACK_SIZE   Define the default stack size used for SystemC
#                               (thread) processes. (> 0)
#
# SystemC_TARGET_ARCH           Target architecture according to the
#                               Accellera SystemC conventions set either from
#                               $ENV{SYSTEMC_TARGET_ARCH}, $ENV{SYSTEMC_ARCH},
#                               or detected by CMake.
#
# INSTALL_TO_LIB_BUILD_TYPE_DIR Install the libraries to a
#                               lib-${CMAKE_BUILD_TYPE}/ to enable parallel
#                               installation of the different build variants.
#                               (default: OFF)
#
# INSTALL_TO_LIB_TARGET_ARCH_DIR  Install the libraries to lib-<target-arch>
#                               to facilitate linking applications, which
#                               build systems assume to find SystemC in
#                               lib-<target-arch>. (default: OFF)
#
# INSTALL_LIB_TARGET_ARCH_SYMLINK  On Unix, install a symlink lib-<target-arch>
#                               to lib-${CMAKE_BUILD_TYPE} facilitating the
#                               linking of user code, which build system assumes
#                               to find the SystemC libraries under
#                               lib-<target-arch>. (default: OFF)
#
# Other configuration variables will be proposed by CMake depending on the OS
# and detected processor, compiler, and libraries. For more information, please
# refer to the CMake documentation or <http://www.cmake.org/>.
#
###############################################################################
#
# TODO:
#
# - Enable the compilation of SystemC as a DLL on Windows! To make it work, the
#   SystemC library has to be at least split into libsystemc-core.dll and a
#   static libsystemc.lib.
#
# - Check whether preprocessor definitions WIN32, _CONSOLE, _LIB, _DEBUG, NDEBUG,
#   and NOGDI are necessary on WIN32 platforms (MSVC and MinGW).
#
# - Turn on more compiler warnings by default once SystemC is supposed to
#   compile without any warnings on recent compiler versions. Currently, the
#   compiler warning flags are set to reduce the number of generated compiler
#   warnings (especially with recent Clang versions, e.g., Apple Clang 6.0) to
#   an acceptable amount. With the chosen flags, the SystemC library compiles
#   without warnings, but some examples still produce warnings.
#
# - Test on as many different hardware / OS platforms as possible.
#
# - Configure and install systemc.pc and tlm.pc for pkg-config
#
###############################################################################

cmake_minimum_required (VERSION 3.5)
cmake_policy(SET CMP0001 NEW)

project (SystemCLanguage CXX C)

# check for multi-config generators (Ninja, Visual Studio, Xcode, ...)
get_property(GENERATOR_IS_MULTI_CONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)

# detect if we are building as package, or by add_subdirectory (pre-3.21 support)
if(NOT DEFINED PROJECT_IS_TOP_LEVEL)
  set(PROJECT_IS_TOP_LEVEL TRUE)
  if(NOT PROJECT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
    set(PROJECT_IS_TOP_LEVEL FALSE)
  endif()
endif()

set(SystemCLanguage_VERSION_FILE "${PROJECT_SOURCE_DIR}/src/sysc/kernel/sc_ver.h")
if(EXISTS ${SystemCLanguage_VERSION_FILE})
    file(READ ${SystemCLanguage_VERSION_FILE} SYSTEMC_VERSION_FILE_CONTENT)
    string(REGEX MATCH "SC_VERSION_MAJOR[ \t]+([0-9]+)" SystemCLanguage_VERSION_MAJOR ${SYSTEMC_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCLanguage_VERSION_MAJOR ${SystemCLanguage_VERSION_MAJOR})
    string(REGEX MATCH "SC_VERSION_MINOR[ \t]+([0-9]+)" SystemCLanguage_VERSION_MINOR ${SYSTEMC_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCLanguage_VERSION_MINOR ${SystemCLanguage_VERSION_MINOR})
    string(REGEX MATCH "SC_VERSION_PATCH[ \t]+([0-9]+)" SystemCLanguage_VERSION_PATCH ${SYSTEMC_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCLanguage_VERSION_PATCH ${SystemCLanguage_VERSION_PATCH})
    string(REGEX MATCH "SC_IS_PRERELEASE[ \t]+([0-9]+)" SystemCLanguage_VERSION_IS_PRERELEASE ${SYSTEMC_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCLanguage_VERSION_IS_PRERELEASE ${SystemCLanguage_VERSION_IS_PRERELEASE})
    string(REGEX MATCH "SC_VERSION_PRERELEASE[ \t]+\"([^\".]+)\"" SystemCLanguage_VERSION_PRERELEASE ${SYSTEMC_VERSION_FILE_CONTENT})
    string(REGEX REPLACE "(.*)\"(.*)\"" "\\2" SystemCLanguage_VERSION_PRERELEASE ${SystemCLanguage_VERSION_PRERELEASE})
    string(REGEX MATCH "SYSTEMC_VERSION[ \t]+([0-9]+)" SystemCLanguage_VERSION_RELEASE_DATE ${SYSTEMC_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCLanguage_VERSION_RELEASE_DATE ${SystemCLanguage_VERSION_RELEASE_DATE})
else(EXISTS ${SystemCLanguage_VERSION_FILE})
    message (FATAL_ERROR "Unable to read SystemC version file")
endif(EXISTS ${SystemCLanguage_VERSION_FILE})

set (SystemCLanguage_VERSION "${SystemCLanguage_VERSION_MAJOR}.${SystemCLanguage_VERSION_MINOR}.${SystemCLanguage_VERSION_PATCH}")
if (SystemCLanguage_VERSION_IS_PRERELEASE)
  set (SystemCLanguage_VERSION "${SystemCLanguage_VERSION}_${SystemCLanguage_VERSION_PRERELEASE}_${SystemCLanguage_VERSION_RELEASE_DATE}")
endif (SystemCLanguage_VERSION_IS_PRERELEASE)
set (SystemCLanguage_SOVERSION "${SystemCLanguage_VERSION_MAJOR}.${SystemCLanguage_VERSION_MINOR}")

set(SystemCTLM_VERSION_FILE "${PROJECT_SOURCE_DIR}/src/tlm_core/tlm_2/tlm_version.h")
if(EXISTS ${SystemCTLM_VERSION_FILE})
    file(READ ${SystemCTLM_VERSION_FILE} SystemCTLM_VERSION_FILE_CONTENT)
    string(REGEX MATCH "TLM_VERSION_MAJOR[ \t]+([0-9]+)" SystemCTLM_VERSION_MAJOR ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCTLM_VERSION_MAJOR ${SystemCTLM_VERSION_MAJOR})
    string(REGEX MATCH "TLM_VERSION_MINOR[ \t]+([0-9]+)" SystemCTLM_VERSION_MINOR ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCTLM_VERSION_MINOR ${SystemCTLM_VERSION_MINOR})
    string(REGEX MATCH "TLM_VERSION_PATCH[ \t]+([0-9]+)" SystemCTLM_VERSION_PATCH ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCTLM_VERSION_PATCH ${SystemCTLM_VERSION_PATCH})
    string(REGEX MATCH "TLM_IS_PRERELEASE[ \t]+([0-9]+)" SystemCTLM_VERSION_IS_PRERELEASE ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCTLM_VERSION_IS_PRERELEASE ${SystemCTLM_VERSION_IS_PRERELEASE})
    string(REGEX MATCH "TLM_VERSION_PRERELEASE[ \t]+\"([^\".]+)\"" SystemCTLM_VERSION_PRERELEASE ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX REPLACE "(.*)\"(.*)\"" "\\2" SystemCTLM_VERSION_PRERELEASE ${SystemCTLM_VERSION_PRERELEASE})
    string(REGEX MATCH "TLM_VERSION_RELEASE_YEAR[ \t]+\"([0-9]+)\"" SystemCTLM_VERSION_RELEASE_YEAR ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCTLM_VERSION_RELEASE_YEAR ${SystemCTLM_VERSION_RELEASE_YEAR})
    string(REGEX MATCH "TLM_VERSION_RELEASE_MONTH[ \t]+\"([0-9]+)\"" SystemCTLM_VERSION_RELEASE_MONTH ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCTLM_VERSION_RELEASE_MONTH ${SystemCTLM_VERSION_RELEASE_MONTH})
    string(REGEX MATCH "TLM_VERSION_RELEASE_DAY[ \t]+\"([0-9]+)\"" SystemCTLM_VERSION_RELEASE_DAY ${SystemCTLM_VERSION_FILE_CONTENT})
    string(REGEX MATCH "([0-9]+)" SystemCTLM_VERSION_RELEASE_DAY ${SystemCTLM_VERSION_RELEASE_DAY})
else(EXISTS ${SystemCTLM_VERSION_FILE})
    message(FATAL_ERROR "Unable to read TLM version file")
endif(EXISTS ${SystemCTLM_VERSION_FILE})

set (SystemCTLM_VERSION_RELEASE_DATE "${SystemCTLM_VERSION_RELEASE_YEAR}${SystemCTLM_VERSION_RELEASE_MONTH}${SystemCTLM_VERSION_RELEASE_DAY}")
set (SystemCTLM_VERSION "${SystemCTLM_VERSION_MAJOR}.${SystemCTLM_VERSION_MINOR}.${SystemCTLM_VERSION_PATCH}")
if (TLM_IS_PRERELEASE)
  set (SystemCTLM_VERSION "${SystemCTLM_VERSION}_${SystemCTLM_VERSION_PRERELEASE}_${SystemCTLM_VERSION_RELEASE_DATE}")
endif (TLM_IS_PRERELEASE)
set (SystemCTLM_SOVERSION "${SystemCTLM_VERSION_MAJOR}.${SystemCTLM_VERSION_MINOR}")


###############################################################################
# Build options
###############################################################################

if(PROJECT_IS_TOP_LEVEL AND NOT WIN32)
  set(SYSTEMC_SANITIZER_CONFIGURATION_TYPES Asan Msan Tsan UBsan)
  if(NOT CMAKE_CXX_COMPILER_ID STREQUAL AppleClang) # LeakSanitizer not supported on AppleClang
    set(SYSTEMC_SANITIZER_CONFIGURATION_TYPES ${SYSTEMC_SANITIZER_CONFIGURATION_TYPES} Lsan)
  endif()
  set(CMAKE_CONFIGURATION_TYPES Release Debug RelWithDebInfo ${SYSTEMC_SANITIZER_CONFIGURATION_TYPES})
endif()

if(NOT CMAKE_BUILD_TYPE AND NOT GENERATOR_IS_MULTI_CONFIG)
  set (CMAKE_BUILD_TYPE Release CACHE STRING
       "Choose the type of build, options are: empty, ${CMAKE_CONFIGURATION_TYPES}."
       FORCE)
endif()

if (NOT (WIN32 OR CYGWIN))
  option (BUILD_SHARED_LIBS "Build shared libraries." ON)
else (NOT (WIN32 OR CYGWIN))
  option (BUILD_SHARED_LIBS "Build shared libraries." OFF)
endif (NOT (WIN32 OR CYGWIN))
if (BUILD_SHARED_LIBS AND (WIN32 OR CYGWIN))
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
endif(BUILD_SHARED_LIBS AND (WIN32 OR CYGWIN))

option (BUILD_SOURCE_DOCUMENTATION "Build source documentation with Doxygen." OFF)

option (DISABLE_COPYRIGHT_MESSAGE "Do not print the copyright message when starting the application." OFF)

option (DISABLE_VCD_SCOPES "Put all traces in a single dummy scope. For compatibility with SystemC 2.3.1." OFF)

option (ENABLE_ASSERTIONS "Always enable the `sc_assert' expressions." ON)

option (ENABLE_PTHREADS
        "Use POSIX threads for SystemC processes instead of QuickThreads on Unix or Fiber on Windows."
        OFF)

option (INSTALL_TO_LIB_BUILD_TYPE_DIR
        "Install the libraries to lib-${CMAKE_BUILD_TYPE} to enable parallel installation of the different build variants. (default: OFF)"
        OFF)

option (ALLOW_DEPRECATED_IEEE_API "Suppress warnings for use of deprecated features in IEEE Std. 1666" OFF)

if (NOT INSTALL_TO_LIB_BUILD_TYPE_DIR)
  option (INSTALL_TO_LIB_TARGET_ARCH_DIR "Install the libraries to lib-<target-arch> to facilitate linking applications, which build systems assume to find SystemC in lib-<target-arch>. (default: OFF)" OFF)
else (NOT INSTALL_TO_LIB_BUILD_TYPE_DIR)
  unset (INSTALL_TO_LIB_TARGET_ARCH_DIR CACHE)
endif (NOT INSTALL_TO_LIB_BUILD_TYPE_DIR)

if (CMAKE_HOST_UNIX AND NOT INSTALL_TO_LIB_TARGET_ARCH_DIR)
  option (INSTALL_LIB_TARGET_ARCH_SYMLINK "Install a symlink lib-<target-arch> to lib-${CMAKE_BUILD_TYPE} facilitating the linking of user code, which build system assumes to find the SystemC libraries under lib-<target-arch>." OFF)
else (CMAKE_HOST_UNIX AND NOT INSTALL_TO_LIB_TARGET_ARCH_DIR)
  unset (INSTALL_LIB_TARGET_ARCH_SYMLINK CACHE)
endif (CMAKE_HOST_UNIX AND NOT INSTALL_TO_LIB_TARGET_ARCH_DIR)

set (OVERRIDE_DEFAULT_STACK_SIZE 0 CACHE STRING "Define the default stack size used for SystemC (thread) processes. (> 0)")
if (OVERRIDE_DEFAULT_STACK_SIZE LESS 0)
  message (SEND_ERROR "Negative default stack size requested for SystemC (thread) processes.")
endif (OVERRIDE_DEFAULT_STACK_SIZE LESS 0)

# Testing
option(ENABLE_EXAMPLES   "Build examples" ${PROJECT_IS_TOP_LEVEL})
option(ENABLE_REGRESSION "Build regression tests" OFF)

mark_as_advanced(DISABLE_COPYRIGHT_MESSAGE
                 ENABLE_ASSERTIONS
                 OVERRIDE_DEFAULT_STACK_SIZE
                 DISABLE_VCD_SCOPES)


###############################################################################
# Set SystemC_TARGET_ARCH depending on OS and processor type
###############################################################################

message (STATUS "Checking OS and processor type.")

if (APPLE)
  list (LENGTH CMAKE_OSX_ARCHITECTURES N_OSX_ARCHITECTURES)
  if (NOT DEFINED CMAKE_OSX_ARCHITECTURES_CACHED OR NOT ("${CMAKE_OSX_ARCHITECTURES}" STREQUAL "${CMAKE_OSX_ARCHITECTURES_CACHED}"))
    set(CMAKE_OSX_ARCHITECTURES_CACHED "${CMAKE_OSX_ARCHITECTURES}" CACHE INTERNAL "" FORCE)
    unset(SystemC_TARGET_ARCH CACHE)
    unset(HAS__aarch64__DEFINED CACHE)
    unset(HAS__i386_DEFINED CACHE)
    unset(HAS__x86_64__DEFINED CACHE)
  endif()
endif (APPLE)

include (CheckSymbolExists)
check_symbol_exists (__x86_64__ "" HAS__x86_64__DEFINED)
check_symbol_exists (__i386 "" HAS__i386_DEFINED)
check_symbol_exists (__aarch64__ "" HAS__aarch64__DEFINED)


# Set SystemC_TARGET_ARCH according to the detected
# OS/processor/compiler platform
if (NOT SystemC_TARGET_ARCH)
  if (DEFINED ENV{SYSTEMC_TARGET_ARCH})
    message (STATUS "Using SYSTEMC_TARGET_ARCH from the environment.")
    set (_TARGET_ARCH $ENV{SYSTEMC_TARGET_ARCH})
  elseif (APPLE)
    if (N_OSX_ARCHITECTURES GREATER 1)
      set (_TARGET_ARCH "macosuniversal")
    elseif (HAS__aarch64__DEFINED)
      set (_TARGET_ARCH "macosarm64")
    elseif (HAS__x86_64__DEFINED)
      set (_TARGET_ARCH "macosx64")
    else (N_OSX_ARCHITECTURES GREATER 1)
      set (_TARGET_ARCH "macosunknown")
    endif (N_OSX_ARCHITECTURES GREATER 1)
  elseif (UNIX AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
    if (HAS__i386_DEFINED)
      set (_TARGET_ARCH "linux")
    elseif (HAS__x86_64__DEFINED)
      set (_TARGET_ARCH "linux64")
    elseif (HAS__aarch64__DEFINED)
      set (_TARGET_ARCH "linuxaarch64")
    else (HAS__i386_DEFINED)
      # Untested platform.
      set (_TARGET_ARCH "linuxunknown")
    endif (HAS__i386_DEFINED)
  elseif (UNIX AND CMAKE_SYSTEM_NAME MATCHES ".*BSD")
    if (HAS__i386_DEFINED)
      set (_TARGET_ARCH "bsd")
    elseif (HAS__x86_64__DEFINED)
      set (_TARGET_ARCH "bsd64")
    else (HAS__i386_DEFINED)
      # Untested platform.
      set (_TARGET_ARCH "bsdunknown")
    endif (HAS__i386_DEFINED)
  elseif (MSVC)
    set (_TARGET_ARCH "msvc")
    if (CMAKE_CL_64)
      set (_TARGET_ARCH "${_TARGET_ARCH}64")
    endif (CMAKE_CL_64)
  elseif (CYGWIN)
    if (HAS__i386_DEFINED)
      set (_TARGET_ARCH "cygwin")
    elseif (HAS__x86_64__DEFINED)
      set (_TARGET_ARCH "cygwin64")
    else (HAS__i386_DEFINED)
      set (_TARGET_ARCH "cygwinunknown")
    endif (HAS__i386_DEFINED)
  elseif (WIN32
          AND ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
               OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")))
    # MinGW platform, as CYGWIN already has been handled
    if (HAS__i386_DEFINED)
      set (_TARGET_ARCH "mingw")
    elseif (HAS__x86_64__DEFINED)
      set (_TARGET_ARCH "mingw64")
    else (HAS__i386_DEFINED)
      set (_TARGET_ARCH "mingwunknown")
    endif (HAS__i386_DEFINED)
  else ($ENV{SYSTEMC_TARGET_ARCH})
    # Unknown platform, so guess a SystemC target architecture value.
    string (TOLOWER "${CMAKE_SYSTEM_NAME}${CMAKE_PROCESSOR_NAME}" _TARGET_ARCH)
  endif (DEFINED ENV{SYSTEMC_TARGET_ARCH})
  set (SystemC_TARGET_ARCH ${_TARGET_ARCH} CACHE STRING "SystemC Target Architecture")
  unset (_TARGET_ARCH)
endif (NOT SystemC_TARGET_ARCH)

###############################################################################
# Configure QuickThreads
###############################################################################

# Set QuickThreads architecture based on the detected preprocessor symbols.
message (STATUS "Detect the target processor architecture for QuickThreads.")
if (ENABLE_PTHREADS)
  set (QT_ARCH "IGNORE") # Pthreads will be used for the SystemC coroutines.
elseif (MSVC)
  set (QT_ARCH "IGNORE") # Fibers will be used for the SystemC coroutines.
elseif (APPLE AND (N_OSX_ARCHITECTURES GREATER 1))
  foreach(arch IN LISTS CMAKE_OSX_ARCHITECTURES)
    if (arch MATCHES "^(arm64|i386|x86_64)$")
      set(QT_ARCH "multi")
    else()
      message (FATAL_ERROR "QuickThreads is not supported on macOS ${arch} universal build.")
    endif()
  endforeach()
elseif (HAS__x86_64__DEFINED)
  set (QT_ARCH "x86_64")
elseif (HAS__i386_DEFINED)
  set (QT_ARCH "i386")
elseif (HAS__aarch64__DEFINED)
  set (QT_ARCH "aarch64")
else (ENABLE_PTHREADS)
  message (WARNING "QuickThreads is not supported on ${CMAKE_SYSTEM} on ${CMAKE_SYSTEM_PROCESSOR}.")
  set (QT_ARCH "IGNORE")
endif (ENABLE_PTHREADS)

if (QT_ARCH)
  # To build QuickThreads, enable the assembler support.
  enable_language (ASM)
else (QT_ARCH)
  # Otherwise, fall back to Pthreads or Fiber.
  if (NOT MSVC)
    set (ENABLE_PTHREADS TRUE CACHE BOOL
         "Use POSIX threads for SystemC processes instead of QuickThreads on Unix or Fiber on Windows."
         FORCE)
  endif (NOT MSVC)
endif (QT_ARCH)


###############################################################################
# Configure Pthreads or Fiber if necessary.
###############################################################################

set (THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)

if (WIN32 AND ENABLE_PTHREADS)
  message (FATAL_ERROR "Pthreads is not supported on ${CMAKE_SYSTEM}.")
endif (WIN32 AND ENABLE_PTHREADS)

###############################################################################
# Set the installation paths
###############################################################################

if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
  if (IS_ABSOLUTE $ENV{SYSTEMC_HOME})
    set (_CMAKE_INSTALL_PREFIX $ENV{SYSTEMC_HOME})
  elseif (UNIX)
    set (_CMAKE_INSTALL_PREFIX "/opt/systemc")
  elseif (WIN32)
    file (TO_CMAKE_PATH $ENV{ProgramFiles} _WIN32_INSTALL_PREFIX)
    set (_CMAKE_INSTALL_PREFIX "${_WIN32_INSTALL_PREFIX}/SystemC")
    unset (_WIN32_INSTALL_PREFIX)
  else (EXISTS $ENV{SYSTEMC_ROOT_DIR})
    set (_CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}/systemc")
  endif (IS_ABSOLUTE $ENV{SYSTEMC_HOME})
  set (CMAKE_INSTALL_PREFIX ${_CMAKE_INSTALL_PREFIX} CACHE PATH "Installation root directory" FORCE)
  unset (_CMAKE_INSTALL_PREFIX)
endif (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)

# Set the installation paths for headers, libraries, and documentation.
set (CMAKE_INSTALL_DOCDIR "share/doc/systemc" CACHE PATH
     "Documentation installation directory") # otherwise mixed-case
if (INSTALL_TO_LIB_BUILD_TYPE_DIR)
  # Install libraries to lib-${CMAKE_BUILD_TYPE} so that different build variants
  # of the library can be installed in parallel to the same SystemC root
  # directory. The find_package() mechanism in config-mode of CMake will then
  # automatically find the correct libraries matching the chosen
  # ${CMAKE_BUILD_TYPE}.
  set (_INSTALL_LIBDIR lib-${CMAKE_BUILD_TYPE})
  string (TOLOWER ${_INSTALL_LIBDIR} _INSTALL_LIBDIR)
  set (CMAKE_INSTALL_LIBDIR ${_INSTALL_LIBDIR} CACHE PATH
       "Object code libraries installation directory" FORCE)
  unset (_INSTALL_LIBDIR)
elseif (INSTALL_TO_LIB_TARGET_ARCH_DIR)
  # Some build systems assume to find SystemC in lib-<target-arch>
  set (CMAKE_INSTALL_LIBDIR lib-${SystemC_TARGET_ARCH} CACHE PATH
       "Object code libraries installation directory" FORCE)
endif (INSTALL_TO_LIB_BUILD_TYPE_DIR)
include (GNUInstallDirs)

# Install symlink lib-<target-arch> to lib-${CMAKE_BUILD_TYPE}
if (INSTALL_LIB_TARGET_ARCH_SYMLINK AND CMAKE_HOST_UNIX)
  install (CODE "
    EXECUTE_PROCESS(COMMAND cmake -E create_symlink ${CMAKE_INSTALL_LIBDIR} lib-${SystemC_TARGET_ARCH}
                    WORKING_DIRECTORY ${CMAKE_INSTALL_PREFIX})
  ")
endif (INSTALL_LIB_TARGET_ARCH_SYMLINK AND CMAKE_HOST_UNIX)

if (INSTALL_TO_LIB_BUILD_TYPE_DIR OR INSTALL_TO_LIB_TARGET_ARCH_DIR)
  set (SystemCLanguage_INSTALL_CMAKEDIR share/cmake/SystemCLanguage CACHE PATH
       "CMake package configuration installation directory" FORCE)
  set (SystemCTLM_INSTALL_CMAKEDIR share/cmake/SystemCTLM CACHE PATH
       "CMake package configuration installation directory" FORCE)
else (INSTALL_TO_LIB_BUILD_TYPE_DIR OR INSTALL_TO_LIB_TARGET_ARCH_DIR)
  set (SystemCLanguage_INSTALL_CMAKEDIR ${CMAKE_INSTALL_LIBDIR}/cmake/SystemCLanguage CACHE PATH
       "CMake package configuration installation directory for the SystemCLanguage package.")
  set (SystemCTLM_INSTALL_CMAKEDIR ${CMAKE_INSTALL_LIBDIR}/cmake/SystemCTLM CACHE PATH
       "CMake package configuration installation directory for the SystemCTLM package.")
endif (INSTALL_TO_LIB_BUILD_TYPE_DIR OR INSTALL_TO_LIB_TARGET_ARCH_DIR)
mark_as_advanced(SystemCLanguage_INSTALL_CMAKEDIR SystemCTLM_INSTALL_CMAKEDIR)
set(SystemCLanguage_INSTALL_FULL_CMAKEDIR "${CMAKE_INSTALL_PREFIX}/${SystemCLanguage_INSTALL_CMAKEDIR}")
set(SystemCTLM_INSTALL_FULL_CMAKEDIR "${CMAKE_INSTALL_PREFIX}/${SystemCTLM_INSTALL_CMAKEDIR}")

###############################################################################
# Global compiler flags (including examples/tests)
###############################################################################

option(ENABLE_WARNINGS_AS_ERRORS "Treat compiler warnings as errors" OFF)
if(ENABLE_WARNINGS_AS_ERRORS)
  add_compile_options(
    $<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:-Werror>
    $<$<CXX_COMPILER_ID:MSVC>:/WX>
  )
endif()

# On Xcode, we need to disable the -Wconversion warning explicitly
if(XCODE)
  add_compile_options($<$<CXX_COMPILER_ID:AppleClang>:-Wno-conversion>)
endif()

# Sanitizer setup
if(DEFINED SYSTEMC_SANITIZER_CONFIGURATION_TYPES)
  function(set_sanitizer_flags type sanitizer cxx_flags)
    set(_common_option "-fsanitize=${sanitizer}")
    set(CMAKE_C_FLAGS_${type}   "${_common_option} -fno-omit-frame-pointer ${cxx_flags}" CACHE STRING "CFLAGS for ${type}" FORCE)
    set(CMAKE_CXX_FLAGS_${type} "${_common_option} -fno-omit-frame-pointer ${cxx_flags}" CACHE STRING "CXXFLAGS for ${type}" FORCE)
    set(CMAKE_EXE_LINKER_FLAGS_${type}    "${_common_option}" CACHE STRING "LINKER_FLAGS for ${type}" FORCE)
    set(CMAKE_SHARED_LINKER_FLAGS_${type} "${_common_option}" CACHE STRING "SHARED_LINKER_FLAGS for ${type}" FORCE)
  endfunction()

  set_sanitizer_flags(ASAN  address   "-fno-optimize-sibling-calls -g -O1")
  set_sanitizer_flags(MSAN  memory    "-fno-optimize-sibling-calls -fsanitize-memory-track-origins -g -O1")
  set_sanitizer_flags(TSAN  thread    "-g -O1")
  set_sanitizer_flags(UBSAN undefined "-g -O1")
  if(NOT CMAKE_CXX_COMPILER_ID STREQUAL AppleClang) # LeakSanitizer not supported
    set_sanitizer_flags(LSAN  leak    "-g -O1")
  endif()
endif()

###############################################################################
# Configure RPATH so that all targets find the libraries they link to
###############################################################################

# Starting from CMake 2.8.12 use CMake's full RPATH support on Mac OS X
set (CMAKE_MACOSX_RPATH TRUE)

# Use, i.e., don't skip, the full RPATH for the build tree.
set (CMAKE_SKIP_BUILD_RPATH  FALSE)
# For build, don't use the install RPATH already (but later on when installing).
set (CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
# Set the RPATH to be used when installing.
set (CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_FULL_LIBDIR}")
# Add the automatically determined parts of the RPATH, which point to
# directories outside the build tree, to the install RPATH.
set (CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)

# Set the RPATH to be used when installing, but only if it's not a system directory
list (FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_FULL_LIBDIR}" isSystemDir)
if ("${isSystemDir}" STREQUAL "-1")
  set (CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_FULL_LIBDIR}")
endif ("${isSystemDir}" STREQUAL "-1")


###############################################################################
# Configure status
###############################################################################

message (STATUS "========================================================================")
message (STATUS "Settings to build SystemC ${SystemCLanguage_VERSION} (${SystemCLanguage_VERSION_RELEASE_DATE}) and TLM ${SystemCTLM_VERSION} (${SystemCTLM_VERSION_RELEASE_DATE})")
message (STATUS "------------------------------------------------------------------------")
message (STATUS "BUILD_SHARED_LIBS = ${BUILD_SHARED_LIBS}")
message (STATUS "BUILD_SOURCE_DOCUMENTATION = ${BUILD_SOURCE_DOCUMENTATION}")
message (STATUS "ENABLE_EXAMPLES = ${ENABLE_EXAMPLES}")
message (STATUS "ENABLE_REGRESSION = ${ENABLE_REGRESSION}")
if (NOT GENERATOR_IS_MULTI_CONFIG)
  message (STATUS "CMAKE_BUILD_TYPE = ${CMAKE_BUILD_TYPE}")
endif()
message (STATUS "DISABLE_COPYRIGHT_MESSAGE = ${DISABLE_COPYRIGHT_MESSAGE}")
message (STATUS "DISABLE_VCD_SCOPES = ${DISABLE_VCD_SCOPES}")
message (STATUS "ENABLE_ASSERTIONS = ${ENABLE_ASSERTIONS}")
if (ENABLE_PTHREADS)
  message ("ENABLE_PTHREADS = ${ENABLE_PTHREADS}")
else (ENABLE_PTHREADS)
  message (STATUS "ENABLE_PTHREADS = ${ENABLE_PTHREADS}")
endif (ENABLE_PTHREADS)
if (OVERRIDE_DEFAULT_STACK_SIZE GREATER 0)
  message (STATUS "OVERRIDE_DEFAULT_STACK_SIZE = ${OVERRIDE_DEFAULT_STACK_SIZE}")
endif (OVERRIDE_DEFAULT_STACK_SIZE GREATER 0)
message (STATUS "SystemC_TARGET_ARCH = ${SystemC_TARGET_ARCH}")
message (STATUS "SystemCLanguage_VERSION = ${SystemCLanguage_VERSION}")
message (STATUS "SystemCTLM_VERSION = ${SystemCTLM_VERSION}")
message (STATUS "INSTALL_TO_LIB_BUILD_TYPE_DIR = ${INSTALL_TO_LIB_BUILD_TYPE_DIR}")
message (STATUS "INSTALL_TO_LIB_TARGET_ARCH_DIR = ${INSTALL_TO_LIB_TARGET_ARCH_DIR}")
message (STATUS "INSTALL_LIB_TARGET_ARCH_SYMLINK = ${INSTALL_LIB_TARGET_ARCH_SYMLINK}")
message (STATUS "------------------------------------------------------------------------")
message (STATUS "CMAKE_SYSTEM = ${CMAKE_SYSTEM}")
message (STATUS "CMAKE_SYSTEM_PROCESSOR = ${CMAKE_SYSTEM_PROCESSOR}")
message (STATUS "QT_ARCH = ${QT_ARCH}")
if (DEFINED CMAKE_OSX_ARCHITECTURES)
  message (STATUS "CMAKE_OSX_ARCHITECTURES = ${CMAKE_OSX_ARCHITECTURES}")
endif (DEFINED CMAKE_OSX_ARCHITECTURES)
if (DEFINED CMAKE_OSX_DEPLOYMENT_TARGET)
  message (STATUS "CMAKE_OSX_DEPLOYMENT_TARGET = ${CMAKE_OSX_DEPLOYMENT_TARGET}")
endif (DEFINED CMAKE_OSX_DEPLOYMENT_TARGET)
if (DEFINED CMAKE_OSX_SYSROOT)
  message (STATUS "CMAKE_OSX_SYSROOT = ${CMAKE_OSX_SYSROOT}")
endif(DEFINED CMAKE_OSX_SYSROOT)
message (STATUS "------------------------------------------------------------------------")
message (STATUS "CMAKE_INSTALL_PREFIX = ${CMAKE_INSTALL_PREFIX}")
message (STATUS "CMAKE_INSTALL_BINDIR = ${CMAKE_INSTALL_BINDIR}")
message (STATUS "CMAKE_INSTALL_DOCDIR = ${CMAKE_INSTALL_DOCDIR}")
message (STATUS "CMAKE_INSTALL_INCLUDEDIR = ${CMAKE_INSTALL_INCLUDEDIR}")
message (STATUS "CMAKE_INSTALL_LIBDIR = ${CMAKE_INSTALL_LIBDIR}")
message (STATUS "INSTALL_CMAKEDIR = ${INSTALL_CMAKEDIR}")
message (STATUS "========================================================================")

###############################################################################
# Subdirectories
###############################################################################

list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
add_subdirectory (src)
add_subdirectory (docs)
add_subdirectory (examples)
add_subdirectory (tests)

###############################################################################
# Install README files
###############################################################################

install (FILES AUTHORS.md
               INSTALL.md
               cmake/INSTALL_USING_CMAKE.md
               LICENSE
               NOTICE
               README.md
               RELEASENOTES.md
         DESTINATION ${CMAKE_INSTALL_DOCDIR}
         COMPONENT doc)


###############################################################################
# Provide package of the SystemC library to other programs using CMake
###############################################################################

# Export the systemc library target for usage by other programs to installation tree
install (EXPORT SystemCLanguageTargets
         NAMESPACE SystemC::
         DESTINATION ${SystemCLanguage_INSTALL_CMAKEDIR}
         COMPONENT dev)

# Register the SystemCLanguage and SystemCTLM packages for use from the
# build tree. (This registers the build tree with the global CMake-registry.)
export (PACKAGE SystemCLanguage)
export (PACKAGE SystemCTLM)

# Create the <Package>Config.cmake and <Package>ConfigVersion files
include(CMakePackageConfigHelpers)
configure_package_config_file(cmake/SystemCLanguageConfig.cmake.in
  ${CMAKE_CURRENT_BINARY_DIR}/SystemCLanguageConfig.cmake
  INSTALL_DESTINATION ${SystemCLanguage_INSTALL_CMAKEDIR})
write_basic_package_version_file(
  "${CMAKE_CURRENT_BINARY_DIR}/SystemCLanguageConfigVersion.cmake"
  VERSION ${SystemCLanguage_VERSION_MAJOR}.${SystemCLanguage_VERSION_MINOR}.${SystemCLanguage_VERSION_PATCH}.${SystemCLanguage_VERSION_RELEASE_DATE}
  COMPATIBILITY AnyNewerVersion
)
configure_package_config_file(cmake/SystemCTLMConfig.cmake.in
  ${CMAKE_CURRENT_BINARY_DIR}/SystemCTLMConfig.cmake
  INSTALL_DESTINATION ${SystemCTLM_INSTALL_CMAKEDIR})
write_basic_package_version_file(
  "${CMAKE_CURRENT_BINARY_DIR}/SystemCTLMConfigVersion.cmake"
  VERSION ${SystemCTLM_VERSION_MAJOR}.${SystemCTLM_VERSION_MINOR}.${SystemCTLM_VERSION_PATCH}.${SystemCTLM_VERSION_RELEASE_DATE}
  COMPATIBILITY AnyNewerVersion
)

# Install the <Package>Config.cmake and <Package>ConfigVersion.cmake
install(FILES "${PROJECT_BINARY_DIR}/SystemCLanguageConfig.cmake"
              "${PROJECT_BINARY_DIR}/SystemCLanguageConfigVersion.cmake"
        DESTINATION "${SystemCLanguage_INSTALL_CMAKEDIR}"
        COMPONENT dev)
install(FILES "${PROJECT_BINARY_DIR}/SystemCTLMConfig.cmake"
              "${PROJECT_BINARY_DIR}/SystemCTLMConfigVersion.cmake"
        DESTINATION "${SystemCTLM_INSTALL_CMAKEDIR}"
        COMPONENT dev)