ffi.include update _int_constant and prevent duplicated const declreusable-enum-values

Duplicated declaration of constants even in enum name is not
valid.

1 files changed, 10 insertions, 0 deletions

diff --git a/cffi/cparser.py b/cffi/cparser.py
index 8ad87db..0456b05 100644
--- a/cffi/cparser.py
+++ b/cffi/cparser.py
@@ -542,6 +542,10 @@ class Parser(object):
                 if enum.value is not None:
                     nextenumvalue = self._parse_constant(enum.value)
                 enumvalues.append(nextenumvalue)
+                if enum.name in self._int_constants:
+                    raise api.FFIError(
+                        "multiple declarations of constant %s" % (enum.name,))
+
                 self._int_constants[enum.name] = nextenumvalue
                 nextenumvalue += 1
             enumvalues = tuple(enumvalues)
@@ -556,3 +560,9 @@ class Parser(object):
             kind = name.split(' ', 1)[0]
             if kind in ('typedef', 'struct', 'union', 'enum'):
                 self._declare(name, tp)
+        for k, v in other._int_constants.items():
+            if k not in self._int_constants:
+                self._int_constants[k] = v
+            else:
+                raise api.FFIError(
+                    "multiple declarations of constant %s" % (k,))