Fix -Wunused-value to not warn on expressions that have unresolved lookups due

to dependent arguments.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166468 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 20 insertions, 0 deletions

diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index 694325af22..3c8cbb56a0 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -1950,6 +1950,11 @@ bool Expr::isUnusedResultAWarning(const Expr *&WarnE, SourceLocation &Loc,
     return false;
   }
 
+  // If we don't know precisely what we're looking at, let's not warn.
+  case UnresolvedLookupExprClass:
+  case CXXUnresolvedConstructExprClass:
+    return false;
+
   case CXXTemporaryObjectExprClass:
   case CXXConstructExprClass:
     return false;
diff --git a/test/SemaCXX/unused.cpp b/test/SemaCXX/unused.cpp
index b9877a1ba4..fbaf8c8bf3 100644
--- a/test/SemaCXX/unused.cpp
+++ b/test/SemaCXX/unused.cpp
@@ -46,3 +46,18 @@ namespace AnonObject {
     int(1); // expected-warning {{expression result unused}}
   }
 }
+
+// Test that constructing an object (which may have side effects) with
+// constructor arguments which are dependent doesn't produce an unused value
+// warning.
+namespace UnresolvedLookup {
+  struct Foo {
+    Foo(int i, int j);
+  };
+  template <typename T>
+  struct Bar {
+    void f(T t) {
+      Foo(t, 0);  // no warning
+    }
+  };
+}