1 files changed, 38 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/countof-zero-compile.c b/gcc/testsuite/gcc.dg/countof-zero-compile.c
new file mode 100644
index 0000000..b561186
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/countof-zero-compile.c
@@ -0,0 +1,38 @@
+/* { dg-do compile } */
+/* { dg-options "-std=gnu2y" } */
+
+static int z[0];
+static int y[_Countof (z)];
+
+_Static_assert(_Countof (y) == 0);
+
+void
+completed (void)
+{
+  int z[] = {};
+
+  static_assert (_Countof (z) == 0);
+}
+
+void zro_fix (int i,
+	      char (*a)[0][5],
+	      int (*x)[_Countof (*a)],
+	      short (*)[_Generic(x, int (*)[0]: 1)]);
+void zro_var (int i,
+	      char (*a)[0][i], /* dg-warn "variable" */
+	      int (*x)[_Countof (*a)],
+	      short (*)[_Generic(x, int (*)[0]: 1)]);
+void zro_uns (int i,
+	      char (*a)[0][*],
+	      int (*x)[_Countof (*a)],
+	      short (*)[_Generic(x, int (*)[0]: 1)]);
+
+void
+const_expr(void)
+{
+  int n = 7;
+
+  _Static_assert (_Countof (int [0][3]) == 0);
+  _Static_assert (_Countof (int [0]) == 0);
+  _Static_assert (_Countof (int [0][n]) == 0);
+}