Add support for explicit constructor calls in Microsoft mode.

For example: 

class A{ 
public:
  A& operator=(const A& that) {
      if (this != &that) {
          this->A::~A();
          this->A::A(that);  // <=== explicit constructor call.
      }
      return *this;
  }
};

More work will be needed to support an explicit call to a template constructor.

llvm-svn: 123735

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 26fdb2e059c..45e0c3377b8 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -3902,6 +3902,12 @@ ExprResult Sema::ActOnMemberAccessExpr(Scope *S, Expr *Base,
   if (SS.isSet() && SS.isInvalid())
     return ExprError();
 
+  // Warn about the explicit constructor calls Microsoft extension.
+  if (getLangOptions().Microsoft &&
+      Id.getKind() == UnqualifiedId::IK_ConstructorName)
+    Diag(Id.getSourceRange().getBegin(),
+         diag::ext_ms_explicit_constructor_call);
+
   TemplateArgumentListInfo TemplateArgsBuffer;
 
   // Decompose the name into its component parts.