demarshaller/marshaller fix gcc 4.6.0

python_modules/demarshal.py and marshal.py fixes for gcc 4.6.0
warning about set but unused variables. The fixes disable creating
of variables mem_size when they are not used (demarshall) and
declaring a src variable when the message doesn't use it (marshal).

You need to touch *.proto after applying this (should add a Makefile
dependency).

1 files changed, 5 insertions, 3 deletions

diff --git a/python_modules/marshal.py b/python_modules/marshal.py
index a82df981..5b4dfdd7 100644
--- a/python_modules/marshal.py
+++ b/python_modules/marshal.py
@@ -356,10 +356,12 @@ def write_message_marshaller(writer, message, is_server, private):
     for n in names:
         writer.assign("*%s_out" % n, "NULL")
 
-    src = RootMarshallingSource(None, message.c_type(), message.sizeof(), "msg")
-    src.reuse_scope = scope
+    # fix warnings about unused variables by not creating body if no members to parse
+    if any(x.is_fixed_nw_size() for x in message.members):
+        src = RootMarshallingSource(None, message.c_type(), message.sizeof(), "msg")
+        src.reuse_scope = scope
 
-    write_container_marshaller(writer, message, src)
+        write_container_marshaller(writer, message, src)
 
     writer.end_block()
     writer.newline()