3 files changed, 15 insertions, 5 deletions
diff --git a/mesalib/src/glsl/glcpp/.gitignore b/mesalib/src/glsl/glcpp/.gitignore
index 41b34bb30..24a7119ca 100644
--- a/mesalib/src/glsl/glcpp/.gitignore
+++ b/mesalib/src/glsl/glcpp/.gitignore
@@ -3,7 +3,4 @@ glcpp-lex.c
 glcpp-parse.output
 glcpp-parse.c
 glcpp-parse.h
-*.o
-*.lo
-*~
 tests/*.out
diff --git a/mesalib/src/glsl/ir.h b/mesalib/src/glsl/ir.h
index 2c4723627..a3f9f0588 100644
--- a/mesalib/src/glsl/ir.h
+++ b/mesalib/src/glsl/ir.h
@@ -89,6 +89,16 @@ class ir_instruction : public exec_node {
 public:
    enum ir_node_type ir_type;
 
+   /**
+    * GCC 4.7+ and clang warn when deleting an ir_instruction unless
+    * there's a virtual destructor present.  Because we almost
+    * universally use ralloc for our memory management of
+    * ir_instructions, the destructor doesn't need to do any work.
+    */
+   virtual ~ir_instruction()
+   {
+   }
+
    /** ir_print_visitor helper for debugging. */
    void print(void) const;
 
diff --git a/mesalib/src/glsl/ir_constant_expression.cpp b/mesalib/src/glsl/ir_constant_expression.cpp
index 7a4d15f43..38a1ed96c 100644
--- a/mesalib/src/glsl/ir_constant_expression.cpp
+++ b/mesalib/src/glsl/ir_constant_expression.cpp
@@ -1322,8 +1322,11 @@ ir_function_signature::constant_expression_value(exec_list *actual_parameters, s
 
    foreach_list(n, actual_parameters) {
       ir_constant *constant = ((ir_rvalue *) n)->constant_expression_value(variable_context);
-      if (constant == NULL)
-	 return NULL;
+      if (constant == NULL) {
+         hash_table_dtor(deref_hash);
+         return NULL;
+      }
+
 
       ir_variable *var = (ir_variable *)parameter_info;
       hash_table_insert(deref_hash, constant, var);