From 629b5e87ed82aa428be1abbe51b80fa338fa839a Mon Sep 17 00:00:00 2001
From: Andrew Turner <andrew@FreeBSD.org>
Date: Mon, 29 Nov 2021 17:21:31 +0000
Subject: [PATCH] Add an arm64 sha512 feature check

This is only available in recent toolchains. Check for it so we can
use it in libmd.

Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33166
---
 share/mk/bsd.compiler.mk | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/share/mk/bsd.compiler.mk b/share/mk/bsd.compiler.mk
index c58eb114f4b8..4a1472c6bfab 100644
--- a/share/mk/bsd.compiler.mk
+++ b/share/mk/bsd.compiler.mk
@@ -25,6 +25,7 @@
 # - retpoline: supports the retpoline speculative execution vulnerability
 #              mitigation.
 # - init-all:  supports stack variable initialization.
+# - aarch64-sha512: supports the AArch64 sha512 intrinsic functions.
 #
 # When bootstrapping on macOS, 'apple-clang' will be set in COMPILER_FEATURES
 # to differentiate Apple's version of Clang. Apple Clang uses a different
@@ -255,6 +256,13 @@ ${X_}COMPILER_FEATURES+=	compressed-debug
 ${X_}COMPILER_FEATURES+=	fileprefixmap
 .endif
 
+.if (${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 130000) || \
+	(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 90000)
+# AArch64 sha512 intrinsics are supported (and have been tested) in
+# clang 13 and gcc 9.
+${X_}COMPILER_FEATURES+=	aarch64-sha512
+.endif
+
 .else
 # Use CC's values
 X_COMPILER_TYPE=	${COMPILER_TYPE}