From e0b35eef37679c719a15d115c95f6dbdb69d1607 Mon Sep 17 00:00:00 2001
From: Jeremie Courreges-Anglas <jca@wxcvbn.org>
Date: Tue, 25 Jul 2023 13:56:09 +0200
Subject: [PATCH] On riscv64 require libatomic if actually needed

clang and newer gcc releases support byte-sized atomic accesses on
riscv64 through inline builtins.  In both cases the hard dependency on
libatomic added by GH-11321 isn't useful.

Stop using AC_CHECK_LIB() which is too naive to notice that libatomic
isn't needed.  Instead, PHP_CHECK_FUNC() will retry the check with -latomic
if required.
---
 configure.ac | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6cf6370fca3b8..3fc0790ea8ae2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -369,11 +369,7 @@ AC_CHECK_LIB(m, sin)
 
 case $host_alias in
   riscv64*)
-    AC_CHECK_LIB(atomic, __atomic_exchange_1, [
-      PHP_ADD_LIBRARY(atomic)
-    ], [
-      AC_MSG_ERROR([Problem with enabling atomic. Please check config.log for details.])
-    ])
+    PHP_CHECK_FUNC(__atomic_exchange_1, atomic)
     ;;
 esac