Add a test for forward declared protocols.

Check that a protocol accessed by forward definition in one compilation
unit is the one defined in another compilation unit.

Test/CMakeLists.txt

@@ -104,6 +104,7 @@ endforeach()
 
 # Tests that are more than a single file.
 addtest_variants("CXXExceptions" "CXXException.m;CXXException.cc" true)
+addtest_variants("ForwardDeclareProtocolAccess" "ForwardDeclareProtocolAccess.m;ForwardDeclareProtocol.m" true)
 if (ENABLE_OBJCXX)
 addtest_variants(ObjCXXEHInterop "ObjCXXEHInterop.mm;ObjCXXEHInterop.m" true)
 endif()

Test/ForwardDeclareProtocol.m

@@ -0,0 +1,6 @@
+@protocol P;
+
+Protocol *getProtocol(void)
+{
+	return @protocol(P);
+}

Test/ForwardDeclareProtocolAccess.m

@@ -0,0 +1,17 @@
+#include "Test.h"
+
+@protocol P
+- (void)someMethod;
+@end
+
+// Defined in another compilation unit.  Returns @protocol(P).
+Protocol *getProtocol(void);
+
+int main(void)
+{
+	//Protocol *p1 = @protocol(P);
+	Protocol *p2 = getProtocol();
+	//assert(protocol_isEqual(p1, p2));
+	//assert(p1 == p2);
+	return 0;
+}