diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3f2e66fdebe7..4b5294cbf0d1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-09-23  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/45750
+	* gimplify.c (gimplify_expr): Properly pass on GS_ERROR when
+	gimplifying MEM_REF.
+
 2010-09-23  Alan Modra  <amodra@gmail.com>
 
 	* config/rs6000/rs6000.c (toc_relative_ok): Delete.
diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index 4e6a037e7ae0..994ffdecea26 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -6809,8 +6809,10 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
 
 	    ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
 				 is_gimple_reg, fb_rvalue);
-	    recalculate_side_effects (*expr_p);
+	    if (ret == GS_ERROR)
+	      break;
 
+	    recalculate_side_effects (*expr_p);
 	    *expr_p = fold_build2_loc (input_location, MEM_REF,
 				       TREE_TYPE (*expr_p),
 				       TREE_OPERAND (*expr_p, 0),
@@ -6835,6 +6837,8 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
 	    }
 	  ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
 			       is_gimple_mem_ref_addr, fb_rvalue);
+	  if (ret == GS_ERROR)
+	    break;
 	  recalculate_side_effects (*expr_p);
 	  ret = GS_ALL_DONE;
 	  break;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index e102d0301bf9..050e571e5ce9 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-09-23  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/45750
+	* gcc.dg/pr45750.c: New testcase.
+
 2010-09-23  Jakub Jelinek  <jakub@redhat.com>
 
 	* gcc.dg/torture/stackalign/alloca-4.c: Remove -m32 from dg-options.
diff --git a/gcc/testsuite/gcc.dg/pr45750.c b/gcc/testsuite/gcc.dg/pr45750.c
new file mode 100644
index 000000000000..22c471b70700
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr45750.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+struct S
+{
+  int i;
+};
+
+int invalid[] = 0; /* { dg-error "invalid initializer" } */
+
+void foo (void)
+{
+  if (((struct S *)undeclared)->i); /* { dg-error "undeclared" } */
+}
+
+/* { dg-message "reported only once" "" { target *-*-* } 13 } */