[vala] codegen: Fix equal function for SimpleType structs with only static fields

[Luca Bruno <lucabru src gnome org>]

commit 3bfe468daa15fd19eebfbf3de8dc48a79810bb30
Author: Luca Bruno <lucabru src gnome org>
Date:   Wed Aug 31 15:37:04 2011 +0200

    codegen: Fix equal function for SimpleType structs with only static fields
    
    The function produced wrong results if the struct had static fields but
    no instance fields.
    
    Fixes bug 657813.

 codegen/valaccodebasemodule.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index c9d1417..f889798 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -2487,12 +2487,15 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 			ccode.close ();
 		}
 
+		bool has_instance_fields = false;
 		foreach (Field f in st.get_fields ()) {
 			if (f.binding != MemberBinding.INSTANCE) {
 				// we only compare instance fields
 				continue;
 			}
 
+			has_instance_fields = true;
+
 			CCodeExpression cexp; // if (cexp) return FALSE;
 			var s1 = (CCodeExpression) new CCodeMemberAccess.pointer (new CCodeIdentifier ("s1"), f.name); // s1->f
 			var s2 = (CCodeExpression) new CCodeMemberAccess.pointer (new CCodeIdentifier ("s2"), f.name); // s2->f
@@ -2520,7 +2523,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 			ccode.close ();
 		}
 
-		if (st.get_fields().size == 0) {
+		if (!has_instance_fields) {
 			// either opaque structure or simple type
 			if (st.is_simple_type ()) {
 				var cexp = new CCodeBinaryExpression (CCodeBinaryOperator.EQUALITY, new CCodeUnaryExpression (CCodeUnaryOperator.POINTER_INDIRECTION, new CCodeIdentifier ("s1")), new CCodeUnaryExpression (CCodeUnaryOperator.POINTER_INDIRECTION, new CCodeIdentifier ("s2")));