random-util: use gcc's bit_RDRND definition if it exists

2019-05-07 17:31:20 -04:00
parent 1a0ffa1e73
commit cc28145d51
1 changed files with 6 additions and 1 deletions
@@ -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)