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diff --git a/src/grep/gnulib-tests/test-alloca-opt.c b/src/grep/gnulib-tests/test-alloca-opt.c
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+/* Test of optional automatic memory allocation.
+ Copyright (C) 2005, 2007, 2009-2021 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#include <config.h>
+
+#include <alloca.h>
+
+#if HAVE_ALLOCA
+
+static void
+do_allocation (int n)
+{
+ void *volatile ptr = alloca (n);
+ (void) ptr;
+}
+
+void (*func) (int) = do_allocation;
+
+#endif
+
+int
+main ()
+{
+#if HAVE_ALLOCA
+ int i;
+
+ /* Repeat a lot of times, to make sure there's no memory leak. */
+ for (i = 0; i < 100000; i++)
+ {
+ /* Try various values.
+ n = 0 gave a crash on Alpha with gcc-2.5.8.
+ Some versions of Mac OS X have a stack size limit of 512 KB. */
+ func (34);
+ func (134);
+ func (399);
+ func (510823);
+ func (129321);
+ func (0);
+ func (4070);
+ func (4095);
+ func (1);
+ func (16582);
+ }
+#endif
+
+ return 0;
+}