diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 5311649d12d..279e91b92f0 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,7 @@
+2014-11-15  Jason Merrill  <jason@redhat.com>
+
+	* constexpr.c (cx_check_missing_mem_inits): Clarify error message.
+
 2014-11-14  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* semantics.c (end_maybe_infinite_loop): Use fold_non_dependent_expr.
diff --git a/gcc/cp/constexpr.c b/gcc/cp/constexpr.c
index d30bf635d84..0d45f31f48a 100644
--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -716,8 +716,9 @@ cx_check_missing_mem_inits (tree fun, tree body, bool complain)
 	    }
 	  if (!complain)
 	    return true;
-	  error ("uninitialized member %qD in %<constexpr%> constructor",
-		 field);
+	  error ("member %qD must be initialized by mem-initializer "
+		 "in %<constexpr%> constructor", field);
+	  inform (DECL_SOURCE_LOCATION (field), "declared here");
 	  bad = true;
 	}
       if (field == NULL_TREE)
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-ctor.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-ctor.C
index 659e733cdcd..55beda7c49f 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-ctor.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-ctor.C
@@ -3,5 +3,5 @@
 struct A
 {
   int i;
-  constexpr A() { }		// { dg-error "uninitialized member .A::i" }
+  constexpr A() { }		// { dg-error "A::i" }
 };
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-diag4.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-diag4.C
index 29f574df389..13ca6fa2390 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-diag4.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-diag4.C
@@ -21,5 +21,5 @@ struct A1
 struct B1
 {
     A1 a1;
-    constexpr B1() {} // { dg-error "uninitialized member" }
+    constexpr B1() {} // { dg-error "B1::a1" }
 };
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-ex3.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-ex3.C
index 3e2685b1c5c..a5893563eec 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-ex3.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-ex3.C
@@ -6,7 +6,7 @@
 struct A
 {
   int i;
-  constexpr A(int _i) { i = _i; } // { dg-error "empty body|uninitialized member" }
+  constexpr A(int _i) { i = _i; } // { dg-error "empty body|A::i" }
 };
 
 template <class T>
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-template2.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-template2.C
index a316b34bd7b..12a8d42b31f 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-template2.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-template2.C
@@ -3,7 +3,7 @@
 template <class T> struct A
 {
   T t;
-  constexpr A() { }		// { dg-error "uninitialized" }
+  constexpr A() { }		// { dg-error "::t" }
 };
 
 int main()
diff --git a/gcc/testsuite/g++.dg/cpp0x/nsdmi3.C b/gcc/testsuite/g++.dg/cpp0x/nsdmi3.C
index 6ac414b7437..d2e74392487 100644
--- a/gcc/testsuite/g++.dg/cpp0x/nsdmi3.C
+++ b/gcc/testsuite/g++.dg/cpp0x/nsdmi3.C
@@ -15,4 +15,4 @@ struct B
 
 constexpr B b;			// { dg-error "B::B" }
 
-// { dg-prune-output "uninitialized member" }
+// { dg-prune-output "B::a1" }