Add support for SYSTEMC_HOME environment variable

With these changes the user may now provide the SystemC library
dependency via an environment variable named SYSTEMC_HOME. It is
expected that SYSTEMC_HOME points to a precompiled SystemC kernel
release.

Signed-off-by: Lukas Jünger <[email protected]>

CMakeLists.txt

@@ -170,7 +170,7 @@
 ###############################################################################
 
 
-cmake_minimum_required (VERSION 3.1)
+cmake_minimum_required (VERSION 3.5)
 cmake_policy(SET CMP0001 NEW)
 
 project (SystemCCCI CXX C)
@@ -362,7 +362,8 @@ endif (NOT SystemC_TARGET_ARCH)
 list (APPEND CMAKE_PREFIX_PATH /opt/systemc)
 
 IF (NOT SystemCLanguage_FOUND AND NOT TARGET SystemC::systemc)
-    find_package(SystemCLanguage CONFIG REQUIRED)
+    list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/cmake)
+    find_package(SystemCLanguage REQUIRED)
 ENDIF ()
 message (STATUS "Using SystemC ${SystemCLanguage_VERSION} (${SystemCLanguage_DIR})")
 IF ( "${SystemC_CXX_STANDARD}" AND NOT "${SystemC_CXX_STANDARD}" EQUAL "${CMAKE_CXX_STANDARD}")

cmake/FindSystemCLanguage.cmake

@@ -0,0 +1,120 @@
+###############################################################################
+#
+# 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.
+#
+###############################################################################
+
+###############################################################################
+#
+# FindSystemCLanguage.cmake --
+# Cmake script for defining the SystemC library target from SYSTEMC_HOME
+#
+# Original Author: Jan Henrik Weinstock, MachineWare Gmbh, 2024
+# Adapted for CCI by Lukas Jünger, MachineWare GmbH, 2024
+#
+###############################################################################
+
+if(NOT DEFINED SystemC_TARGET_ARCH)
+    if(DEFINED ENV{TARGET_ARCH})
+        set(SystemC_TARGET_ARCH $ENV{TARGET_ARCH})
+    elseif(DEFINED TARGET_ARCH)
+        set(SystemC_TARGET_ARCH ${TARGET_ARCH})
+    elseif(UNIX AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
+        if(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86")
+            set(SystemC_TARGET_ARCH "linux")
+        elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
+            set(SystemC_TARGET_ARCH "linux64")
+        elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
+            set(SystemC_TARGET_ARCH "linuxaarch64")
+        endif()
+    elseif(MSVC)
+        set(SystemC_TARGET_ARCH "msvc64")
+    elseif(APPLE)
+        if (CMAKE_SYSTEM_PROCESSOR MATCHES aarch64|arm64)
+            set(SystemC_TARGET_ARCH "macosxarm64")
+        elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
+            set(SystemC_TARGET_ARCH "macosx64")
+        endif()
+    endif()
+endif()
+
+if(NOT DEFINED SystemC_TARGET_ARCH)
+    message(FATAL_ERROR "Cannot determine SystemC TARGET_ARCH")
+endif()
+
+if(NOT TARGET SystemC::systemc)
+    if(NOT DEFINED SYSTEMC_HOME AND DEFINED ENV{SYSTEMC_HOME})
+        set(SYSTEMC_HOME $ENV{SYSTEMC_HOME})
+    endif()
+    find_path(SYSTEMC_INCLUDE_DIRS NAMES systemc
+            HINTS ${SYSTEMC_HOME}/include)
+
+    find_library(SYSTEMC_LIBRARIES NAMES libsystemc.a systemc
+            HINTS "${SYSTEMC_HOME}/lib-${SystemC_TARGET_ARCH}"
+            "${SYSTEMC_HOME}/lib")
+
+    if(EXISTS ${SYSTEMC_INCLUDE_DIRS}/tlm/)
+        list(APPEND SYSTEMC_INCLUDE_DIRS ${SYSTEMC_INCLUDE_DIRS}/tlm)
+    endif()
+endif()
+
+set(SYSTEMC_VERSION "")
+file(GLOB_RECURSE _sysc_ver_file ${SYSTEMC_HOME}/*/sysc/kernel/sc_ver.h)
+if(NOT EXISTS ${_sysc_ver_file})
+    message(FATAL_ERROR "Cannot find sc_ver.h")
+endif()
+
+file(STRINGS ${_sysc_ver_file} _systemc_ver REGEX
+        "^#[\t ]*define[\t ]+SC_VERSION_(MAJOR|MINOR|PATCH)[\t ]+([0-9]+)$")
+foreach(VPART MAJOR MINOR PATCH)
+    foreach(VLINE ${_systemc_ver})
+        if(VLINE MATCHES
+                "^#[\t ]*define[\t ]+SC_VERSION_${VPART}[\t ]+([0-9]+)$")
+            set(SYSTEMC_VERSION_${VPART} ${CMAKE_MATCH_1})
+            if(SYSTEMC_VERSION)
+                string(APPEND SYSTEMC_VERSION .${CMAKE_MATCH_1})
+            else()
+                set(SYSTEMC_VERSION ${CMAKE_MATCH_1})
+            endif()
+        endif()
+    endforeach()
+endforeach()
+
+set(SystemCLanguage_VERSION ${SYSTEMC_VERSION})
+set(SystemCLanguage_DIR ${SYSTEMC_LIBRARIES})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SystemCLanguage
+        REQUIRED_VARS SYSTEMC_LIBRARIES SYSTEMC_INCLUDE_DIRS
+        VERSION_VAR   SYSTEMC_VERSION)
+
+if (SystemCLanguage_FOUND AND NOT TARGET SystemC::systemc)
+    add_library(systemc UNKNOWN IMPORTED GLOBAL)
+    set_target_properties(systemc PROPERTIES
+            IMPORTED_LOCATION "${SYSTEMC_LIBRARIES}")
+    target_include_directories(systemc INTERFACE "${SYSTEMC_INCLUDE_DIRS}")
+    add_library(SystemC::systemc ALIAS systemc)
+endif()
+
+message(DEBUG "SYSTEMC_FOUND         " ${SYSTEMC_FOUND})
+message(DEBUG "SYSTEMC_HOME          " ${SYSTEMC_HOME})
+message(DEBUG "SystemC_TARGET_ARCH   " ${SystemC_TARGET_ARCH})
+message(DEBUG "SYSTEMC_INCLUDE_DIRS  " ${SYSTEMC_INCLUDE_DIRS})
+message(DEBUG "SYSTEMC_LIBRARIES     " ${SYSTEMC_LIBRARIES})
+message(DEBUG "SYSTEMC_VERSION_MAJOR " ${SYSTEMC_VERSION_MAJOR})
+message(DEBUG "SYSTEMC_VERSION_MINOR " ${SYSTEMC_VERSION_MINOR})
+message(DEBUG "SYSTEMC_VERSION_PATCH " ${SYSTEMC_VERSION_PATCH})
+message(DEBUG "SYSTEMC_VERSION       " ${SYSTEMC_VERSION})

examples/CMakeLists.txt

@@ -38,7 +38,7 @@
 #
 ###############################################################################
 
-cmake_minimum_required (VERSION 3.0)
+cmake_minimum_required (VERSION 3.5)
 
 if (NOT TARGET check)
    add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} -C "${CMAKE_BUILD_TYPE}")