From 9f98d2ec5dce715c3c565bb4ec353cd989101e16 Mon Sep 17 00:00:00 2001
From: Raymond Wong <infiwang@pm.me>
Date: Sun, 3 Apr 2022 14:01:15 +0800
Subject: [PATCH] cmake: check for 8-bit atomic operation

Fix building on RISC-V.
Closes #8850.

Signed-off-by: Raymond Wong <infiwang@pm.me>
---
 cmake/ConfigureChecks.cmake | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/cmake/ConfigureChecks.cmake b/cmake/ConfigureChecks.cmake
index 924aea101..6562d324f 100644
--- a/cmake/ConfigureChecks.cmake
+++ b/cmake/ConfigureChecks.cmake
@@ -255,10 +255,13 @@ int main () {
 check_cxx_source_compiles("
 #include <atomic>
 #include <cstdint>
+std::atomic<uint8_t> n8 (0);
 std::atomic<uint64_t> n64 (0);
 int main() {
-uint64_t i = n64.load(std::memory_order_relaxed);
-return std::atomic_is_lock_free(&n64);
+uint8_t i = n8.load(std::memory_order_relaxed);
+uint64_t j = n64.load(std::memory_order_relaxed);
+return std::atomic_is_lock_free(&n8)
+     & std::atomic_is_lock_free(&n64);
 }"
 LIBATOMIC_NOT_NEEDED)
 IF (NOT LIBATOMIC_NOT_NEEDED)