2 files changed, 19 insertions, 1 deletions
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index 5d6565b..c5bf337 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -2992,7 +2992,7 @@ c_expr_sizeof_expr (location_t loc, struct c_expr expr)
       c_last_sizeof_loc = loc;
       ret.original_code = SIZEOF_EXPR;
       ret.original_type = NULL;
-      if (c_vla_type_p (TREE_TYPE (folded_expr)))
+      if (C_TYPE_VARIABLE_SIZE (TREE_TYPE (folded_expr)))
 	{
 	  /* sizeof is evaluated when given a vla (C99 6.5.3.4p2).  */
 	  ret.value = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (ret.value),
diff --git a/gcc/testsuite/gcc.dg/vla-stexp-1.c b/gcc/testsuite/gcc.dg/vla-stexp-1.c
new file mode 100644
index 0000000..97d6693
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vla-stexp-1.c
@@ -0,0 +1,18 @@
+/* PR29970*/
+/* { dg-do run } */
+/* { dg-options "-Wall -O0" } */
+
+int foo(void)
+{
+	int n = 0;
+	return sizeof(*({ n = 10; struct foo { int x[n]; } x; &x; }));
+}
+
+
+int main()
+{
+	if (sizeof(struct foo { int x[10]; }) != foo())
+		__builtin_abort();
+
+	return 0;
+}