From 78db324970df6e094096237e520719aef550c9a9 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kwvg@users.noreply.github.com>
Date: Fri, 15 Jan 2021 10:54:07 +0800
Subject: [PATCH] partial bitcoin#20938: fix linking against -latomic when
 building for riscv

includes:
- 54ce4fac80689621dcbcc76169b2b00b179ee743
---
 build-aux/m4/l_atomic.m4 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/build-aux/m4/l_atomic.m4 b/build-aux/m4/l_atomic.m4
index 75c43f9a92..5201a8cc7c 100644
--- a/build-aux/m4/l_atomic.m4
+++ b/build-aux/m4/l_atomic.m4
@@ -14,6 +14,9 @@ m4_define([_CHECK_ATOMIC_testbody], [[
   #include <cstdint>
 
   int main() {
+    std::atomic<bool> lock{true};
+    std::atomic_exchange(&lock, false);
+
     std::atomic<int64_t> a{};
 
     int64_t v = 5;