Add support for __extension__ as an lvalue. rdar://6097308

llvm-svn: 54033

2 files changed, 8 insertions, 1 deletions

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index 6c7d170d036..7eab87ff79e 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -415,7 +415,8 @@ Expr::isLvalueResult Expr::isLvalue() const {
       return LV_Valid; // C99 6.5.3p4
 
     if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real ||
-        cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag)
+        cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag ||
+        cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension)
       return cast<UnaryOperator>(this)->getSubExpr()->isLvalue();  // GNU.
     break;
   case ParenExprClass: // C99 6.5.1p5
diff --git a/clang/test/Sema/exprs.c b/clang/test/Sema/exprs.c
index 01758772874..fc506f7a2b3 100644
--- a/clang/test/Sema/exprs.c
+++ b/clang/test/Sema/exprs.c
@@ -9,3 +9,9 @@ _Complex double test2() {
   return 1.0if;    // expected-warning {{imaginary constants are an extension}}
 }
 
+// rdar://6097308
+void test3() {
+  int x;
+  (__extension__ x) = 10;
+}
+