From a7da5a3981d8fd2fadc5146da4ab5ad33de5482e Mon Sep 17 00:00:00 2001
From: Rosen Penev <rosenp@gmail.com>
Date: Tue, 6 May 2025 13:53:04 -0700
Subject: [PATCH] add support for external libatomic

Needed on some 32-bit platforms where 64-bit atomics are provided by
libatomic.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
----
--- a/scripts/check_atomic.m4
+++ b/scripts/check_atomic.m4
@@ -30,15 +30,7 @@ AC_DEFUN([CHECK_ATOMIC], [
   AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[
       AC_MSG_RESULT([yes])
     ],[
-      AC_MSG_RESULT([no])
       ATOMIC_LIBS=-latomic
-      AC_MSG_CHECKING([whether std::atomic needs -latomic])
-      AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[
-          AC_MSG_RESULT([yes])
-        ],[
-          AC_MSG_RESULT([no])
-          AC_MSG_FAILURE([cannot figure out how to use std::atomic])
-        ])
     ])
 
   AC_LANG_POP