1 files changed, 33 insertions, 0 deletions
diff --git a/portable/dummy.c b/portable/dummy.c
new file mode 100644
index 000000000000..121a7343edd0
--- /dev/null
+++ b/portable/dummy.c
@@ -0,0 +1,33 @@
+/*
+ * Dummy symbol to prevent an empty library.
+ *
+ * On platforms that already have all of the functions that libportable would
+ * supply, Automake builds an empty library and then calls ar with nonsensical
+ * arguments.  Ensure that libportable always contains at least one symbol.
+ *
+ * The canonical version of this file is maintained in the rra-c-util package,
+ * which can be found at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
+ *
+ * Written by Russ Allbery <eagle@eyrie.org>
+ * Copyright 2017 Russ Allbery <eagle@eyrie.org>
+ * Copyright 2008, 2011, 2013
+ *     The Board of Trustees of the Leland Stanford Junior University
+ *
+ * Copying and distribution of this file, with or without modification, are
+ * permitted in any medium without royalty provided the copyright notice and
+ * this notice are preserved.  This file is offered as-is, without any
+ * warranty.
+ *
+ * SPDX-License-Identifier: FSFAP
+ */
+
+#include <portable/macros.h>
+
+/* Prototype to avoid gcc warnings and set visibility. */
+int portable_dummy(void) __attribute__((__const__, __visibility__("hidden")));
+
+int
+portable_dummy(void)
+{
+    return 42;
+}