sysbuild: cmake: partition manager integration

This commit ports and updates cmake/partition_manager.cmake to a
sysbuild specific version in cmake/sysbuild/partition_manager.cmake.

The main reason for a new CMake file is the need to run partition
manager outside of an application image build.
The parent-child image scheme runs partition manager in the parent image
build of each core.

Sysbuild builds each image individually and the concept of a parent
image of a core does not exist.
The sysbuild partition manager has been updated to provide functions
which allows partition manager to be invoked multiple times in same
scope, once per domain (core).

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

Author: tejlmand

cmake/extensions.cmake

@@ -297,11 +297,24 @@ function(set_shared)
   set(multi_args  "PROPERTY")
   cmake_parse_arguments(SHARE "${flags}" "${single_args}" "${multi_args}" ${ARGN})
 
+  if(SYSBUILD)
+    # Sysbuild can read the cache directly, no reason for an extra share file.
+    list(POP_FRONT SHARE_PROPERTY listname)
+    if(SHARE_APPEND)
+      list(APPEND ${listname} ${SHARE_PROPERTY})
+      list(REMOVE_DUPLICATES ${listname})
+      set(SHARE_PROPERTY ${${listname}})
+    endif()
+    set(${listname} "${SHARE_PROPERTY}" CACHE INTERNAL "shared var")
+    return()
+  endif()
+
   check_arguments_required("set_shared" SHARE IMAGE FILE)
 
   check_arguments_exclusive("set_shared" SHARE FILE IMAGE PROPERTY APPEND)
   check_arguments_exclusive("set_shared" SHARE IMAGE FILE)
 
+
   set(prop_target ${IMAGE_NAME}_shared_property_target)
   if(NOT TARGET ${prop_target})
     add_custom_target(${prop_target})

cmake/partition_manager.cmake

@@ -57,7 +57,7 @@ elseif (EXISTS ${board_dir_pm_static_common})
   set(static_configuration_file ${board_dir_pm_static_common})
 endif()
 
-if (EXISTS ${static_configuration_file})
+if (EXISTS "${static_configuration_file}" AND NOT SYSBUILD)
   message(STATUS "Found partition manager static configuration: "
                  "${static_configuration_file}"
   )
@@ -107,7 +107,9 @@ if (NOT (
   (NOT IMAGE_NAME AND PM_IMAGES) OR
   (NOT IMAGE_NAME AND PM_DOMAINS) OR
   (PM_SUBSYS_PREPROCESSED AND CONFIG_PM_SINGLE_IMAGE)
-  ))
+  )
+  OR SYSBUILD
+  )
   return()
 endif()