r311115 - PR34161: support evaluation of 'void()' expressions in C++14 onwards.

[Richard Smith via cfe-commits]

Author: rsmith
Date: Thu Aug 17 12:35:50 2017
New Revision: 311115

URL: http://llvm.org/viewvc/llvm-project?rev=311115&view=rev
Log:
PR34161: support evaluation of 'void()' expressions in C++14 onwards.

Modified:
    cfe/trunk/lib/AST/ExprConstant.cpp
    cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp

Modified: cfe/trunk/lib/AST/ExprConstant.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/ExprConstant.cpp?rev=311115&r1=311114&r2=311115&view=diff
==============================================================================
--- cfe/trunk/lib/AST/ExprConstant.cpp (original)
+++ cfe/trunk/lib/AST/ExprConstant.cpp Thu Aug 17 12:35:50 2017
@@ -9787,6 +9787,8 @@ public:
 
   bool Success(const APValue &V, const Expr *e) { return true; }
 
+  bool ZeroInitialization(const Expr *E) { return true; }
+
   bool VisitCastExpr(const CastExpr *E) {
     switch (E->getCastKind()) {
     default:

Modified: cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp?rev=311115&r1=311114&r2=311115&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp (original)
+++ cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp Thu Aug 17 12:35:50 2017
@@ -982,3 +982,9 @@ constexpr void PR28739(int n) { // expec
   int *p = &n;
   p += (__int128)(unsigned long)-1; // expected-note {{cannot refer to element 18446744073709551615 of non-array object in a constant expression}}
 }
+
+constexpr void Void(int n) {
+  void(n + 1);
+  void();
+}
+constexpr int void_test = (Void(0), 1);