Misc fixes for -Wreorder:

1. Make it work correctly with anonymous unions.
2. Don't compute it if the warning isn't enabled.
3. Optimize the algorithm slightly to make it linear time in the 
case where we don't produce any warnings.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76630 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 1 deletions

diff --git a/test/SemaCXX/warn-reorder-ctor-initialization.cpp b/test/SemaCXX/warn-reorder-ctor-initialization.cpp
index 107c89355e..a1990329ac 100644
--- a/test/SemaCXX/warn-reorder-ctor-initialization.cpp
+++ b/test/SemaCXX/warn-reorder-ctor-initialization.cpp
@@ -73,4 +73,17 @@ struct X : public virtual A, virtual V, public virtual B {
 			// expected-note {{base 'struct V'}}
 };
 
-
+class Anon {
+  int c; union {int a,b;}; int d;
+  Anon() : c(10), b(1), d(2) {}
+};
+class Anon2 {
+  int c; union {int a,b;}; int d;
+  Anon2() : c(2),
+            d(10), // expected-warning {{member 'd' will be initialized after}}
+            b(1) {} // expected-note {{field b}}
+};
+class Anon3 {
+  union {int a,b;};
+  Anon3() : b(1) {}
+};