From c2aa86d19c5b52ce2a7383a088ddda959c23db58 Mon Sep 17 00:00:00 2001
From: Ed Maste <emaste@FreeBSD.org>
Date: Thu, 8 Jun 2017 20:06:09 +0000
Subject: [PATCH] arm64: add ".arch armv8-a+crc" to allow use of crc
 instructions

With Clang 5.0 the .arch directive is required, otherwise Clang
complains "error: instruction requires: crc".

This was reported in D10499 but not added initially, because clang 3.8
available on a ref machine reported unknown directive.  Clang 4.0 allows
but does not require the directive.

Submitted by:	andrew
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
---
 sys/libkern/arm64/crc32c_armv8.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/libkern/arm64/crc32c_armv8.S b/sys/libkern/arm64/crc32c_armv8.S
index 072dfd6427ba..e5d0ff80d97b 100644
--- a/sys/libkern/arm64/crc32c_armv8.S
+++ b/sys/libkern/arm64/crc32c_armv8.S
@@ -27,6 +27,7 @@
 
 #include <machine/asm.h>
 __FBSDID("$FreeBSD$");
+.arch armv8-a+crc
 
 /*
  * uint32_t