Ensure link tasks are processed after swig tasks

playground/swig/wscript

@@ -169,7 +169,7 @@ def exec_test_python(bld):
 		proc = subprocess.Popen('''
 PYTHONPATH=$PYTHONPATH:build/extend/python
 LD_LIBRARY_PATH=$LD_LIBRARY_PATH:build/extend/python:build/extend
-python -c "import test_swig_waf; a=test_swig_waf.A(); print 'Testing: a.add(2, 3) ->', a.add(2, 3)"
+python -c "import test_swig_waf; a=test_swig_waf.A(); print('Testing: a.add(2, 3) -> %r' % a.add(2, 3))"
 '''.replace('\n', ' '), shell=True)
 		proc.wait()
 	except:

waflib/extras/swig.py

@@ -5,7 +5,7 @@
 
 import re
 from waflib import Task, Logs
-from waflib.TaskGen import extension
+from waflib.TaskGen import extension, feature, after_method
 from waflib.Configure import conf
 from waflib.Tools import c_preproc
 
@@ -95,6 +95,7 @@ class swig(Task.Task):
 swig_langs = {}
 def swigf(fun):
 	swig_langs[fun.__name__.replace('swig_', '')] = fun
+	return fun
 swig.swigf = swigf
 
 def swig_c(self):
@@ -160,6 +161,18 @@ def i_file(self, node):
 		outdir.mkdir()
 		tsk.outdir = outdir
 
+@feature('c', 'cxx', 'd', 'fc', 'asm')
+@after_method('apply_link', 'process_source')
+def enforce_swig_before_link(self):
+	try:
+		link_task = self.link_task
+	except AttributeError:
+		pass
+	else:
+		for x in self.tasks:
+			if x.__class__.__name__ == 'swig':
+				link_task.run_after.add(x)
+
 @conf
 def check_swig_version(conf, minver=None):
 	"""