diff -up Mesa-9.0.1/src/gallium/drivers/nv50/codegen/nv50_ir.cpp.jx Mesa-9.0.1/src/gallium/drivers/nv50/codegen/nv50_ir.cpp

--- Mesa-9.0.1/src/gallium/drivers/nv50/codegen/nv50_ir.cpp.jx	2012-08-31 19:33:41.000000000 -0400

+++ Mesa-9.0.1/src/gallium/drivers/nv50/codegen/nv50_ir.cpp	2012-12-20 12:58:02.115699825 -0500

@@ -715,7 +715,9 @@ Instruction::clone(ClonePolicy<Function>

 {

    if (!i)

       i = new_Instruction(pol.context(), op, dType);

+#ifdef __GXX_RTTI

    assert(typeid(*i) == typeid(*this));

+#endif

    pol.set<Instruction>(this, i);