Added guards in actsconfig to prevent traccc circular dependency

cmake/ActsConfig.cmake.in

@@ -11,115 +11,119 @@
 #   - Acts_COMMIT_HASH
 #   - Acts_COMMIT_HASH_SHORT
 
-@PACKAGE_INIT@
+if (NOT TARGET Acts)
+  @PACKAGE_INIT@
 
-set(Acts_COMPONENTS @_components@)
-set(Acts_COMMIT_HASH "@_acts_commit_hash@")
-set(Acts_COMMIT_HASH_SHORT "@_acts_commit_hash_short@")
+  set(Acts_COMPONENTS @_components@)
+  set(Acts_COMMIT_HASH "@_acts_commit_hash@")
+  set(Acts_COMMIT_HASH_SHORT "@_acts_commit_hash_short@")
 
-# print version and components information
-if(NOT Acts_FIND_QUIETLY)
-  message(STATUS "found Acts version ${Acts_VERSION} commit ${Acts_COMMIT_HASH_SHORT}")
-endif()
+  # print version and components information
+  if(NOT Acts_FIND_QUIETLY)
+    message(STATUS "found Acts version ${Acts_VERSION} commit ${Acts_COMMIT_HASH_SHORT}")
+  endif()
 
-# check that requested components are available
-foreach(_component ${Acts_FIND_COMPONENTS})
-  # check if this component is available
-  if(NOT _component IN_LIST Acts_COMPONENTS)
-    if (${Acts_FIND_REQUIRED_${_component}})
-      # not supported, but required -> fail
-      set(Acts_FOUND False)
-      set(Acts_NOT_FOUND_MESSAGE "required component '${_component}' not found")
-    else()
-      # not supported and optional -> skip
-      list(REMOVE_ITEM Acts_FIND_COMPONENTS ${_component})
-      if(NOT Acts_FIND_QUIETLY)
-        message(STATUS "optional component '${_component}' not found")
+  # check that requested components are available
+  foreach(_component ${Acts_FIND_COMPONENTS})
+    # check if this component is available
+    if(NOT _component IN_LIST Acts_COMPONENTS)
+      if (${Acts_FIND_REQUIRED_${_component}})
+        # not supported, but required -> fail
+        set(Acts_FOUND False)
+        set(Acts_NOT_FOUND_MESSAGE "required component '${_component}' not found")
+      else()
+        # not supported and optional -> skip
+        list(REMOVE_ITEM Acts_FIND_COMPONENTS ${_component})
+        if(NOT Acts_FIND_QUIETLY)
+          message(STATUS "optional component '${_component}' not found")
+        endif()
       endif()
     endif()
-  endif()
-endforeach()
+  endforeach()
 
-# add this to the current CMAKE_MODULE_PATH to find third party modules 
-# that not provide a XXXConfig.cmake or XXX-config.cmake file
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/Modules)
+  # add this to the current CMAKE_MODULE_PATH to find third party modules 
+  # that not provide a XXXConfig.cmake or XXX-config.cmake file
+  list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/Modules)
 
-# find external dependencies that are needed to link with Acts. since the
-# exported Acts targets only store the linked external target names they need
-# to be found again. this avoids hard-coded paths and makes the installed
-# config/library relocatable. use exact version match where possible to ensure
-# the same versions are found that were used at build time.
-# `find_dependency` is a wrapper around `find_package` that automatically
-# handles QUIET and REQUIRED parameters.
-include(CMakeFindDependencyMacro)
-if(@ACTS_USE_SYSTEM_BOOST@)
-  find_dependency(Boost @Boost_VERSION_STRING@ CONFIG EXACT)
-endif()
-if(@ACTS_USE_SYSTEM_EIGEN3@)
-  find_dependency(Eigen3 @Eigen3_VERSION@ CONFIG EXACT)
-endif()
-if(PluginDD4hep IN_LIST Acts_COMPONENTS)
-  find_dependency(DD4hep @DD4hep_VERSION@ CONFIG EXACT)
-endif()
-if(PluginJson IN_LIST Acts_COMPONENTS)
-  find_dependency(nlohmann_json @nlohmann_json_VERSION@ CONFIG EXACT)
-endif()
-if(PluginTGeo IN_LIST Acts_COMPONENTS)
-  find_dependency(ROOT @ROOT_VERSION@ CONFIG EXACT)
-endif()
-if(PluginActSVG IN_LIST Acts_COMPONENTS)
-  find_dependency(actsvg @actsvg_VERSION@ CONFIG EXACT)
-endif()
-if(PluginEDM4hep IN_LIST Acts_COMPONENTS)
-  find_dependency(EDM4HEP @EDM4HEP_VERSION@ CONFIG EXACT)
-endif()
-if(PluginPodio IN_LIST Acts_COMPONENTS)
-  find_dependency(podio @podio_VERSION@ CONFIG EXACT)
-endif()
-if(PluginGeoModel IN_LIST Acts_COMPONENTS)
-  find_dependency(GeoModelCore @GeoModel_VERSION@ CONFIG EXACT)
-  find_dependency(GeoModelIO @GeoModel_VERSION@ CONFIG EXACT)
-endif()
+  # find external dependencies that are needed to link with Acts. since the
+  # exported Acts targets only store the linked external target names they need
+  # to be found again. this avoids hard-coded paths and makes the installed
+  # config/library relocatable. use exact version match where possible to ensure
+  # the same versions are found that were used at build time.
+  # `find_dependency` is a wrapper around `find_package` that automatically
+  # handles QUIET and REQUIRED parameters.
+  include(CMakeFindDependencyMacro)
+  if(@ACTS_USE_SYSTEM_BOOST@)
+    find_dependency(Boost @Boost_VERSION_STRING@ CONFIG EXACT)
+  endif()
+  if(@ACTS_USE_SYSTEM_EIGEN3@)
+    find_dependency(Eigen3 @Eigen3_VERSION@ CONFIG EXACT)
+  endif()
+  if(PluginDD4hep IN_LIST Acts_COMPONENTS)
+    find_dependency(DD4hep @DD4hep_VERSION@ CONFIG EXACT)
+  endif()
+  if(PluginJson IN_LIST Acts_COMPONENTS)
+    find_dependency(nlohmann_json @nlohmann_json_VERSION@ CONFIG EXACT)
+  endif()
+  if(PluginTGeo IN_LIST Acts_COMPONENTS)
+    find_dependency(ROOT @ROOT_VERSION@ CONFIG EXACT)
+  endif()
+  if(PluginActSVG IN_LIST Acts_COMPONENTS)
+    find_dependency(actsvg @actsvg_VERSION@ CONFIG EXACT)
+  endif()
+  if(PluginEDM4hep IN_LIST Acts_COMPONENTS)
+    find_dependency(EDM4HEP @EDM4HEP_VERSION@ CONFIG EXACT)
+  endif()
+  if(PluginPodio IN_LIST Acts_COMPONENTS)
+    find_dependency(podio @podio_VERSION@ CONFIG EXACT)
+  endif()
+  if(PluginGeoModel IN_LIST Acts_COMPONENTS)
+    find_dependency(GeoModelCore @GeoModel_VERSION@ CONFIG EXACT)
+    find_dependency(GeoModelIO @GeoModel_VERSION@ CONFIG EXACT)
+  endif()
 
-if (PluginCovfie IN_LIST Acts_COMPONENTS)
-  find_dependency(covfie @covfie_VERSION@ CONFIG EXACT)
-endif()
+  if (PluginCovfie IN_LIST Acts_COMPONENTS)
+    find_dependency(covfie @covfie_VERSION@ CONFIG EXACT)
+  endif()
 
-if(PluginDetray IN_LIST Acts_COMPONENTS OR PluginTraccc IN_LIST Acts_COMPONENTS)
-  find_dependency(vecmem @vecmem_VERSION@ CONFIG EXACT)
-  find_dependency(algebra-plugins @algebra-plugins_VERSION@ CONFIG EXACT)
-  find_dependency(detray @detray_VERSION@ CONFIG EXACT)
-endif()
+  if(PluginDetray IN_LIST Acts_COMPONENTS OR PluginTraccc IN_LIST Acts_COMPONENTS)
+    find_dependency(vecmem @vecmem_VERSION@ CONFIG EXACT)
+    find_dependency(algebra-plugins @algebra-plugins_VERSION@ CONFIG EXACT)
+    find_dependency(detray @detray_VERSION@ CONFIG EXACT)
+  endif()
 
-if(PluginTraccc IN_LIST Acts_COMPONENTS)
-  find_dependency(traccc @traccc_VERSION@ CONFIG EXACT)
-endif()
+  if(PluginTraccc IN_LIST Acts_COMPONENTS)
+    if (NOT TARGET traccc)
+      find_dependency(traccc @traccc_VERSION@ CONFIG EXACT)
+    endif()
+  endif()
 
-# dependencies that we have built ourselves but cannot be
-# straightforwardly handed to cmake
-if(NOT @ACTS_USE_SYSTEM_BOOST@)
-  add_library(Boost::boost INTERFACE IMPORTED GLOBAL)
-  target_include_directories(Boost::boost INTERFACE "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
-endif()
-if(NOT @ACTS_USE_SYSTEM_EIGEN3@)
-  add_library(Eigen3::Eigen INTERFACE IMPORTED GLOBAL)
-  target_include_directories(Eigen3::Eigen INTERFACE "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
-endif()
+  # dependencies that we have built ourselves but cannot be
+  # straightforwardly handed to cmake
+  if(NOT @ACTS_USE_SYSTEM_BOOST@)
+    add_library(Boost::boost INTERFACE IMPORTED GLOBAL)
+    target_include_directories(Boost::boost INTERFACE "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
+  endif()
+  if(NOT @ACTS_USE_SYSTEM_EIGEN3@)
+    add_library(Eigen3::Eigen INTERFACE IMPORTED GLOBAL)
+    target_include_directories(Eigen3::Eigen INTERFACE "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
+  endif()
 
-if(PluginPodio IN_LIST Acts_COMPONENTS)
-  include(${CMAKE_CURRENT_LIST_DIR}/ActsPodioEdmTargets.cmake)
-endif()
+  if(PluginPodio IN_LIST Acts_COMPONENTS)
+    include(${CMAKE_CURRENT_LIST_DIR}/ActsPodioEdmTargets.cmake)
+  endif()
 
-# load **all** available components. we can not just include the requested
-# components since there can be interdependencies between them.
-if(NOT Acts_FIND_QUIETLY)
-  message(STATUS "loading components:")
-endif()
-foreach(_component ${Acts_COMPONENTS})
+  # load **all** available components. we can not just include the requested
+  # components since there can be interdependencies between them.
   if(NOT Acts_FIND_QUIETLY)
-    message(STATUS "  ${_component}")
+    message(STATUS "loading components:")
   endif()
-  # include the targets file to create the imported targets for the user
-  include(${CMAKE_CURRENT_LIST_DIR}/Acts${_component}Targets.cmake)
-endforeach()
+  foreach(_component ${Acts_COMPONENTS})
+    if(NOT Acts_FIND_QUIETLY)
+      message(STATUS "  ${_component}")
+    endif()
+    # include the targets file to create the imported targets for the user
+    include(${CMAKE_CURRENT_LIST_DIR}/Acts${_component}Targets.cmake)
+  endforeach()
 
+endif()