CPack/IFW: Locate the archivegen utility

Fixes: #21427

Help/cpack_gen/ifw.rst

@@ -231,6 +231,10 @@ The following variables provide the locations of the QtIFW
 command-line tools as discovered by the module :module:`CPackIFW`.
 These variables are cached, and may be configured if needed.
 
+.. variable:: CPACK_IFW_ARCHIVEGEN_EXECUTABLE
+
+ The path to ``archivegen``.
+
 .. variable:: CPACK_IFW_BINARYCREATOR_EXECUTABLE
 
  The path to ``binarycreator``.

Modules/CPackIFW.cmake

@@ -436,6 +436,16 @@ find_program(CPACK_IFW_DEVTOOL_EXECUTABLE
   )
 mark_as_advanced(CPACK_IFW_DEVTOOL_EXECUTABLE)
 
+# Look for 'archivegen'
+
+find_program(CPACK_IFW_ARCHIVEGEN_EXECUTABLE
+  NAMES archivegen
+  PATHS ${_CPACK_IFW_PATHS}
+  PATH_SUFFIXES ${_CPACK_IFW_SUFFIXES}
+  DOC "QtIFW archivegen command line client"
+  )
+mark_as_advanced(CPACK_IFW_ARCHIVEGEN_EXECUTABLE)
+
 #
 ## Next code is included only once
 #