WAF: derive the variable NS3_MODULES from the 'all_modules' list in src/wscript, instead of requiring every module to define a configure function to register themselves. This way module registration is done in one place only: src/wscript. Requires module naming conventions, though.

src/wscript

@@ -29,9 +29,11 @@ def configure(conf):
 
     blddir = os.path.abspath(os.path.join(conf.m_blddir, conf.env.variant()))
     for module in all_modules:
-        conf.sub_config(module)
         conf.env.append_value('NS3_MODULE_PATH', os.path.join(blddir, 'src', module))
 
+    ## Used to link the 'run-tests' program with all of ns-3 code
+    conf.env['NS3_MODULES'] = ['ns3-' + module.split('/')[-1] for module in all_modules]
+
 
 def build(bld):
     Object.register('ns3header', Ns3Header)