From 1fd8a45ca67657cbf178d69c772fa88b9b257da3 Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Mon, 5 Jun 2023 18:44:31 +0100
Subject: [PATCH] cmake: Restrict check for CRC32C intrinsic to aarch64

The HAVE_ARM64_CRC32C test can erroneously pass when building on armv7,
resulting in a broken library and failed tests.

This change addresses the issue by narrowing the check to aarch64
platforms.
---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0b8e7c..da0b4a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -149,8 +149,12 @@ check_cxx_source_compiles("
 #include <arm_neon.h>
 
 int main() {
+#ifdef __aarch64__
   __crc32cb(0, 0); __crc32ch(0, 0); __crc32cw(0, 0); __crc32cd(0, 0);
   vmull_p64(0, 0);
+#else
+#error CRC32C library does not support hardware acceleration on ARM 32-bit
+#endif
   return 0;
 }
 " HAVE_ARM64_CRC32C)