modules/CMakeLists.txt iterates topologically sorted list of modules

modules/CMakeLists.txt

@@ -1,12 +1,20 @@
 # Include the modules that we'll build
 
+# The list of modules is ordered so that each module occurs after any others
+# that it depends on
+set( MODULES
+   mod-script-pipe
+)
 if( NOT CMAKE_SYSTEM_NAME MATCHES "Windows" )
-add_subdirectory( mod-null )
-add_subdirectory( mod-nyq-bench )
+   list( APPEND MODULES
+      mod-null
+      mod-nyq-bench
+   )
 endif()
 
-add_subdirectory( mod-script-pipe )
-
+foreach( MODULE ${MODULES} )
+   add_subdirectory("${MODULE}")
+endforeach()
 
 if( NOT CMAKE_SYSTEM_NAME MATCHES "Darwin" )
    if( NOT "${CMAKE_GENERATOR}" MATCHES "Visual Studio*")