1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-12.c b/gcc/testsuite/gcc.dg/builtin-object-size-12.c
new file mode 100644
index 000000000..b21eb0071
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-12.c
@@ -0,0 +1,19 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+struct S {
+    int len;
+    char s[0];
+};
+int main()
+{
+  char buf[sizeof (struct S) + 32];
+  if (__builtin_object_size (((struct S *)&buf[0])->s, 1) != 32)
+    abort ();
+  if (__builtin_object_size (((struct S *)&buf[1])->s, 1) != 31)
+    abort ();
+  if (__builtin_object_size (((struct S *)&buf[64])->s, 0) != 0)
+    abort ();
+  return 0;
+}