From d4bebc874b1b6dba953b901ee80f6d2a86a8d678 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@sury.org>
Date: Wed, 13 May 2020 08:22:29 +0200
Subject: Properly detect CRC32 APIs on aarch64 from configure

The CRC32 APIs are optional for armv8-a. They became mandatory since
armv8.1-a.

Closes GH-5564.
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index fdf35e213b..c589896741 100644
--- a/configure.ac
+++ b/configure.ac
@@ -720,6 +720,12 @@ if test "x$php_crypt_r" = "x1"; then
   PHP_CRYPT_R_STYLE
 fi
 
+AC_CACHE_CHECK([for aarch64 CRC32 API], ac_cv_func___crc32d,
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <arm_acle.h>]],[[__crc32d(0, 0);]])],[ac_cv_func___crc32d=yes],[ac_cv_func___crc32d="no"])])
+if test "$ac_cv_func___crc32d" = "yes"; then
+  AC_DEFINE([HAVE_AARCH64_CRC32], [1], [Define when aarch64 CRC32 API is available.])
+fi
+
 dnl Check for asm goto support.
 AC_CACHE_CHECK([for asm goto], ac_cv__asm_goto,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[
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