re PR tree-optimization/36766 (natGC.cc:229: internal compiler error: Segmentation fault)

	PR tree-optimization/36766
	* tree-cfg.c (gimple_purge_all_dead_eh_edges): Do nothing
	for already removed basic blocks.

	* g++.dg/tree-ssa/pr36766.C: New test.

From-SVN: r139908

gcc/ChangeLog

 2008-09-02  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/36766
+	* tree-cfg.c (gimple_purge_all_dead_eh_edges): Do nothing
+	for already removed basic blocks.
+
 	PR target/36332
 	* real.c (real_maxval): Clear a lower bit to make real_maxval
 	match get_max_float for IBM long double format.

gcc/testsuite/ChangeLog

 2008-09-02  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/36766
+	* g++.dg/tree-ssa/pr36766.C: New test.
+
 	PR target/36332
 	* gcc.c-torture/execute/ieee/pr36332.c: New test.
 

gcc/testsuite/g++.dg/tree-ssa/pr36766.C

+// PR tree-optimization/36766
+// { dg-do compile }
+// { dg-options "-O -fnon-call-exceptions" }
+
+struct A
+{
+  ~A ()
+  {
+    int *a = this->b;
+  }
+  int *b;
+};
+
+struct B : A
+{
+  B ()
+  {
+    int *a = this->b;
+  }
+   ~B ()
+  {
+    int *a = this->b;
+  }
+};
+
+void
+foo ()
+{
+  B *c = new B;
+  delete c;
+}

gcc/tree-cfg.c

@@ -6560,7 +6560,13 @@ gimple_purge_all_dead_eh_edges (const_bitmap blocks)
 
   EXECUTE_IF_SET_IN_BITMAP (blocks, 0, i, bi)
     {
-      changed |= gimple_purge_dead_eh_edges (BASIC_BLOCK (i));
+      basic_block bb = BASIC_BLOCK (i);
+
+      /* Earlier gimple_purge_dead_eh_edges could have removed
+	 this basic block already.  */
+      gcc_assert (bb || changed);
+      if (bb != NULL)
+	changed |= gimple_purge_dead_eh_edges (bb);
     }
 
   return changed;