Run dumpcpp also when type library is specified by UUID

We should only give a value to the custom command's MAIN_DEPENDENCY if
the type library is a file, not when it is an UUID. If the
MAIN_DEPENDENCY does not exist as a target or a file, the custom command
is not run at build time.

This regression was introduced in
377c95c4a0 when the MAIN_DEPENDENCY was
introduced to reevaluate the custom command if the type library file
changed.

Fixes: QTBUG-126518
Pick-to: 6.8
Change-Id: Idc5346049ce9e5215827a454c3031e5062fb010d
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

src/activeqt/container/Qt6AxContainerMacros.cmake

@@ -49,6 +49,9 @@ function(qt6_target_typelibs target)
     set(hex_six "${hex_two}${hex_two}${hex_two}")
 
     set(ident_ "[a-zA-Z0-9_]")
+
+    set(typelibFilePath "") # Only set if type library is a file and not a UUID
+
     foreach(lib IN LISTS arg_LIBRARIES)
         unset(libpath CACHE)
         if(lib MATCHES "^(${ident_}+):({${hex_four}-${hex_two}-${hex_two}-${hex_two}-${hex_six}})$")
@@ -71,6 +74,7 @@ C indentifier")
                 endif()
             endif()
 
+            set(typelibFilePath ${libpath})
             get_filename_component(out_basename "${libpath}" NAME_WE)
         endif()
 
@@ -88,7 +92,7 @@ C indentifier")
                 "${libpath}" -o "${out_filebasepath}"
                 ${extra_args}
             DEPENDS ${QT_CMAKE_EXPORT_NAMESPACE}::dumpcpp
-            MAIN_DEPENDENCY ${libpath}
+            MAIN_DEPENDENCY ${typelibFilePath}
             WORKING_DIRECTORY "${output_directory}"
             COMMENT "Generate type lib sources ${out_header} ${out_source}..."
         )

tests/auto/dumpcpp/CMakeLists.txt

@@ -21,4 +21,4 @@ qt_internal_add_test(tst_dumpcpp
 )
 
 qt6_target_typelibs(tst_dumpcpp LIBRARIES "ieframe.dll")
-qt6_target_typelibs(tst_dumpcpp LIBRARIES "msxml6.dll")
+qt6_target_typelibs(tst_dumpcpp LIBRARIES "msxml6:{F5078F18-C551-11D3-89B9-0000F81FE221}")