Add missing lvalue-to-rvalue conversion.

llvm-svn: 143364

2 files changed, 9 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaCast.cpp b/clang/lib/Sema/SemaCast.cpp
index 7a063036c2f..20742a0c35a 100644
--- a/clang/lib/Sema/SemaCast.cpp
+++ b/clang/lib/Sema/SemaCast.cpp
@@ -529,6 +529,12 @@ CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType,
 /// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
 /// checked downcasts in class hierarchies.
 void CastOperation::CheckDynamicCast() {
+  if (ValueKind == VK_RValue && !isPlaceholder(BuiltinType::Overload)) {
+    SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.take());
+    if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
+      return;
+  }
+
   QualType OrigSrcType = SrcExpr.get()->getType();
   QualType DestType = Self.Context.getCanonicalType(this->DestType);
 
diff --git a/clang/test/SemaCXX/constant-expression-cxx11.cpp b/clang/test/SemaCXX/constant-expression-cxx11.cpp
index 4c662a06cc6..8c845a7bd98 100644
--- a/clang/test/SemaCXX/constant-expression-cxx11.cpp
+++ b/clang/test/SemaCXX/constant-expression-cxx11.cpp
@@ -197,6 +197,9 @@ constexpr bool s4 = &x >= &x;
 constexpr bool s5 = &x < &x;
 constexpr bool s6 = &x > &x;
 
+constexpr S* sptr = &s;
+constexpr bool dyncast = sptr == dynamic_cast<S*>(sptr);
+
 using check = int[m1 + (m2<<1) + (m3<<2) + (m4<<3) + (m5<<4) + (m6<<5) +
                   (n1<<6) + (n2<<7) + (n7<<8) + (n8<<9) + (g1<<10) + (g2<<11) +
                (s1<<12) + (s2<<13) + (s3<<14) + (s4<<15) + (s5<<16) + (s6<<17)];