cmake build: Create DebugInfo component with separate debug info

When building with RelWithDebInfo. The CMake code is adapted from
corresponding (internal) functions from Qt 6.
Also let the scripts create an additional *-debug.7z with the debug
info.

Task-number: QTCREATORBUG-24916
Change-Id: Ibc3c8c0013718b9c5e868136e5ce01e1e99f84c4
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

cmake/QtCreatorAPI.cmake

@@ -6,6 +6,7 @@ set(QT_CREATOR_API_DEFINED TRUE)
 set(IDE_QT_VERSION_MIN "5.14.0")
 
 include(${CMAKE_CURRENT_LIST_DIR}/QtCreatorAPIInternal.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/QtcSeparateDebugInfo.cmake)
 
 set(IDE_APP_PATH "${_IDE_APP_PATH}")                    # The target path of the IDE application (relative to CMAKE_INSTALL_PREFIX).
 set(IDE_APP_TARGET "${_IDE_APP_TARGET}")                # The IDE application name.
@@ -241,6 +242,8 @@ function(add_qtc_library name)
       OPTIONAL
   )
 
+  qtc_enable_separate_debug_info(${name} "${IDE_LIBRARY_PATH}")
+
   if (library_type STREQUAL "SHARED")
     set(target_prefix ${CMAKE_SHARED_LIBRARY_PREFIX})
     if (WIN32)
@@ -483,6 +486,8 @@ function(add_qtc_plugin target_name)
         OPTIONAL
     )
 
+    qtc_enable_separate_debug_info(${target_name} "${plugin_dir}")
+
     if (_arg_EXPORT)
       # export of external plugins
       install(EXPORT ${export}
@@ -714,6 +719,8 @@ function(add_qtc_executable name)
       )
     endif()
 
+    qtc_enable_separate_debug_info(${name} "${_DESTINATION}")
+
     update_cached_list(__QTC_INSTALLED_EXECUTABLES
       "${_DESTINATION}/${name}${CMAKE_EXECUTABLE_SUFFIX}")