Update CMakeLists.txt to use Key4hepConfig.cmake

CMakeLists.txt

@@ -1,6 +1,6 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 3.15)
 
-project(k4SimGeant4)
+project(k4SimGeant4 LANGUAGES CXX)
 
 #---------------------------------------------------------------
 # Options
@@ -11,32 +11,24 @@ find_package(ROOT COMPONENTS RIO Tree)
 
 #---------------------------------------------------------------
 # Load macros and functions for Gaudi-based projects
-find_package(Gaudi)
-find_package(k4FWCore)
-find_package(Geant4)
-find_package(DD4hep)
-find_package(CLHEP)
+find_package(Gaudi REQUIRED)
+find_package(k4FWCore REQUIRED)
 find_package(EDM4HEP 0.99)
+find_package(Geant4 REQUIRED)
+find_package(DD4hep REQUIRED)
+find_package(CLHEP REQUIRED)
 #---------------------------------------------------------------
 
+include(cmake/Key4hepConfig.cmake)
+
 include(GNUInstallDirs)
 include(CTest)
 
-set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE CACHE BOOL "RPATH USE LINK PATH")
-
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
   set(CMAKE_INSTALL_PREFIX ${CMAKE_SOURCE_DIR}/InstallArea/ CACHE PATH
     "Install path prefix, prepended onto install directories." FORCE )
 endif()
 
-# Set up C++ Standard
-# ``-DCMAKE_CXX_STANDARD=<standard>`` when invoking CMake
-set(CMAKE_CXX_STANDARD 17 CACHE STRING "")
-
-if(NOT CMAKE_CXX_STANDARD MATCHES "17|20")
-  message(FATAL_ERROR "Unsupported C++ standard: ${CMAKE_CXX_STANDARD}")
-endif()
-
 message(${CMAKE_MODULE_PATH})
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
 message(${CMAKE_MODULE_PATH})

cmake/Key4hepConfig.cmake

@@ -0,0 +1,88 @@
+# Do not edit this file, it will be overwritten!
+# The template file can be found in
+# https://github.com/key4hep/key4hep-dev-utils/blob/main/defaults/cmake/Key4hepConfig.cmake
+
+macro(key4hep_set_compiler_flags)
+
+  set(COMPILER_FLAGS "-fPIC -Wall -Wextra -Wpedantic -Wshadow -Wdeprecated")
+
+  if(CMAKE_CXX_COMPILER_ID MATCHES "^(Apple)?Clang$")
+    set(COMPILER_FLAGS "${COMPILER_FLAGS} -Winconsistent-missing-override -Wheader-hygiene -fcolor-diagnostics")
+  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    set(COMPILER_FLAGS "${COMPILER_FLAGS} -fdiagnostics-color=always -Wno-dangling-reference")
+  endif()
+
+  if (DEFINED KEY4HEP_SET_COMPILER_FLAGS AND NOT KEY4HEP_SET_COMPILER_FLAGS)
+  else()
+    set(CMAKE_CXX_FLAGS "${COMPILER_FLAGS} ${CMAKE_CXX_FLAGS}")
+  endif()
+
+endmacro()
+
+macro(key4hep_set_build_type)
+
+  # For ccmake and cmake-gui
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+    "None" "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
+
+  if(NOT CMAKE_CONFIGURATION_TYPES)
+    if(NOT CMAKE_BUILD_TYPE)
+      set(CMAKE_BUILD_TYPE RelWithDebInfo
+        CACHE STRING "Choose the type of build, options are: None, Release, MinSizeRel, Debug, RelWithDebInfo (default)"
+        FORCE
+        )
+    else()
+      set(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}"
+        CACHE STRING "Choose the type of build, options are: None, Release, MinSizeRel, Debug, RelWithDebInfo (default)"
+        FORCE
+        )
+    endif()
+  endif()
+endmacro()
+
+macro(key4hep_set_cxx_standard_and_extensions)
+  set(CMAKE_CXX_STANDARD 20 CACHE STRING "")
+
+  if(NOT CMAKE_CXX_STANDARD MATCHES "20|23")
+    message(FATAL_ERROR "Unsupported C++ standard: ${CMAKE_CXX_STANDARD}, supported values are 20 and 23")
+  endif()
+
+  set(CMAKE_CXX_STANDARD_REQUIRED ON)
+  set(CMAKE_CXX_EXTENSIONS OFF)
+
+endmacro()
+
+macro(key4hep_set_rpath)
+  #  When building, don't use the install RPATH already (but later on when installing)
+  set(CMAKE_SKIP_BUILD_RPATH FALSE)         # don't skip the full RPATH for the build tree
+  set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE) # use always the build RPATH for the build tree
+  set(CMAKE_MACOSX_RPATH TRUE)              # use RPATH for MacOSX
+  set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE) # point to directories outside the build tree to the install RPATH
+
+  # Check whether to add RPATH to the installation (the build tree always has the RPATH enabled)
+  if(APPLE)
+    set(CMAKE_INSTALL_NAME_DIR "@rpath")
+    set(CMAKE_INSTALL_RPATH "@loader_path/../lib")    # self relative LIBDIR
+    # the RPATH to be used when installing, but only if it's not a system directory
+    list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir)
+    if("${isSystemDir}" STREQUAL "-1")
+      set(CMAKE_INSTALL_RPATH "@loader_path/../lib")
+    endif()
+  elseif(DEFINED KEY4HEP_SET_RPATH AND NOT KEY4HEP_SET_RPATH)
+    set(CMAKE_SKIP_INSTALL_RPATH TRUE)           # skip the full RPATH for the install tree
+  else()
+    set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${LIBDIR}") # install LIBDIR
+    # the RPATH to be used when installing, but only if it's not a system directory
+    list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir)
+    if("${isSystemDir}" STREQUAL "-1")
+      set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${LIBDIR}")
+    endif()
+  endif()
+endmacro()
+
+###################################################
+
+key4hep_set_compiler_flags()
+key4hep_set_build_type()
+key4hep_set_cxx_standard_and_extensions()
+key4hep_set_rpath()