Fix error during Xcode archive

CMakeLists.txt

@@ -58,6 +58,10 @@ if((UNIX AND NOT APPLE) OR NINTENDO_SWITCH)
     include(FindPkgConfig)
 endif()
 
+if(IOS)
+    include(cmake/XcodeHelper.cmake)
+endif()
+
 if(APPLE AND NOT IOS)
     if(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "arm")
 	set(ARCHFLAGS "arm64")
@@ -568,6 +572,14 @@ else()
             XCODE_ATTRIBUTE_INSTALL_PATH /Applications
             XCODE_ATTRIBUTE_SKIP_INSTALL No
             XCODE_ATTRIBUTE_ASSETCATALOG_COMPILER_APPICON_NAME "AppIcon")
+        if(CMAKE_GENERATOR MATCHES "Xcode")
+            get_all_targets(supertuxkart_targets ${CMAKE_CURRENT_LIST_DIR})
+            foreach(target IN LISTS supertuxkart_targets)
+                if (NOT target MATCHES "supertuxkart")
+                    set_target_properties(${target} PROPERTIES ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib$(EFFECTIVE_PLATFORM_NAME)/${target})
+                endif()
+            endforeach()
+        endif()
     else()
         add_executable(supertuxkart ${STK_SOURCES} ${STK_RESOURCES} ${STK_HEADERS})
     endif()

cmake/XcodeHelper.cmake

@@ -0,0 +1,14 @@
+# Collect all currently added targets in all subdirectories
+#
+# Parameters:
+# - _result the list containing all found targets
+# - _dir root directory to start looking from
+function(get_all_targets _result _dir)
+    get_property(_subdirs DIRECTORY "${_dir}" PROPERTY SUBDIRECTORIES)
+    foreach(_subdir IN LISTS _subdirs)
+        get_all_targets(${_result} "${_subdir}")
+    endforeach()
+
+    get_directory_property(_sub_targets DIRECTORY "${_dir}" BUILDSYSTEM_TARGETS)
+    set(${_result} ${${_result}} ${_sub_targets} PARENT_SCOPE)
+endfunction()