From cc28145d51f62711fdc4b4c229aecd5778806419 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 7 May 2019 16:21:44 -0400
Subject: [PATCH] random-util: use gcc's bit_RDRND definition if it exists

---
 src/basic/random-util.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/basic/random-util.c b/src/basic/random-util.c
index de29e07549..205d5501e5 100644
--- a/src/basic/random-util.c
+++ b/src/basic/random-util.c
@@ -45,7 +45,12 @@ int rdrand(unsigned long *ret) {
                         return -EOPNOTSUPP;
                 }
 
-                have_rdrand = !!(ecx & (1U << 30));
+/* Compat with old gcc where bit_RDRND didn't exist yet */
+#ifndef bit_RDRND
+#define bit_RDRND (1U << 30)
+#endif
+
+                have_rdrand = !!(ecx & bit_RDRND);
         }
 
         if (have_rdrand == 0)
-- 
2.25.1