From e2bb89ccb394d1739c249bfc763a5d47fac3d0bd Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vz-swig@zeitlins.org>
Date: Thu, 21 Apr 2016 01:32:49 +0200
Subject: [PATCH] Replace unknown enums with int in the wrappers

An enum can be declared outside of the code wrapped by SWIG, just use int
instead of it then.
---
 Examples/test-suite/c/Makefile.in |  1 -
 Source/Modules/c.cxx              | 21 ++++++++++++++-------
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/Examples/test-suite/c/Makefile.in b/Examples/test-suite/c/Makefile.in
index 5e4a30365..261832ec9 100644
--- a/Examples/test-suite/c/Makefile.in
+++ b/Examples/test-suite/c/Makefile.in
@@ -27,7 +27,6 @@ CPP_TEST_CASES := \
 # The following tests are currently broken and need to be fixed.
 FAILING_C_TESTS := \
     arrays \
-    enum_missing \
     funcptr \
     function_typedef \
     lextype \
diff --git a/Source/Modules/c.cxx b/Source/Modules/c.cxx
index 134b4289f..0d38fe085 100644
--- a/Source/Modules/c.cxx
+++ b/Source/Modules/c.cxx
@@ -1363,14 +1363,21 @@ ready:
       Delete(type_str);
       type_str = int_type_str;
     } else {
-      // Don't bother with checking if type is representable in C if we're wrapping C and not C++ anyhow: of course it is.
-      if (CPlusPlus) {
-	if (SwigType_isreference(type))
-	  return NIL;
+      scoped_dohptr btype(SwigType_base(type));
+      if (SwigType_isenum(btype)) {
+	// Enums are special as they can be unknown, i.e. not wrapped by SWIG. In this case we just use int instead.
+	if (!enumLookup(btype)) {
+	  Replaceall(type_str, btype, "int");
+	}
+      } else {
+	// Don't bother with checking if type is representable in C if we're wrapping C and not C++ anyhow: of course it is.
+	if (CPlusPlus) {
+	  if (SwigType_isreference(type))
+	    return NIL;
 
-	scoped_dohptr btype(SwigType_base(type));
-	if (!SwigType_isbuiltin(btype) && !SwigType_isenum(btype))
-	  return NIL;
+	  if (!SwigType_isbuiltin(btype))
+	    return NIL;
+	}
       }
     }