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python/lib/gen_external.py: always show errors

--- a/python/lib/gen_external.py

+++ b/python/lib/gen_external.py

@@ -105,10 +105,10 @@

     assert proc, 'Proc was none'

     cpp_output = proc.stdout.read()

     err_output = proc.stderr.read()

+    if err_output:

+        print("Warning: preprocessor produced errors or warnings:\n%s" % err_output)

     if not cpp_output:

         raise Exception("preprocessor output is empty:\n%s" % err_output)

-    elif err_output:

-        print("Warning: preprocessor produced warnings:\n%s" % err_output)

     if not isinstance(cpp_output, list):

         cpp_output = [l.strip() for l in cpp_output.decode('utf8').split('\n')]