From 1100a3140749c7dc3547ec96f1e69f9cd92c8a89 Mon Sep 17 00:00:00 2001
From: "C.W. Betts" <computers57@hotmail.com>
Date: Wed, 23 Dec 2020 00:26:53 -0700
Subject: [PATCH] CMake: Apple Silicon detection

CMake's CMAKE_SYSTEM_PROCESSOR call returns "arm64" on Apple Silicon. This patch makes sure that arm64 and aarch64 are treated as the same architecture.
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b01b90fc54..15c4126d64 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -206,7 +206,7 @@ elseif(_ARCH_64 AND CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|amd64|AMD64")
   add_definitions(-D_M_X86=1)
   add_definitions(-D_M_X86_64=1)
   check_and_add_flag(HAVE_SSE2 -msse2)
-elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
+elseif(_ARCH_64 AND CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|arm64")
   set(_M_ARM_64 1)
   add_definitions(-D_M_ARM_64=1)
   # CRC instruction set is used in the CRC32 hash function