From 8ab8b2fef97e3bf10148e471c4c12215c505f1af Mon Sep 17 00:00:00 2001
From: Eric Long <i@hack3r.moe>
Date: Thu, 8 Sep 2022 01:49:43 +0800
Subject: [PATCH] chore(cmake): Fix CheckAtomic.cmake to check sub-word atomics

Platforms like riscv64 does have 32-bit or 64-bit atomics, but not 8-bit or 16-bit.

Modified `check_working_cxx_atomics` to check sub-word atomics as well.
---
 cmake/CheckAtomic.cmake | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/cmake/CheckAtomic.cmake b/cmake/CheckAtomic.cmake
index 609e230d4..718183b15 100644
--- a/cmake/CheckAtomic.cmake
+++ b/cmake/CheckAtomic.cmake
@@ -27,9 +27,12 @@ function(check_working_cxx_atomics varname)
   set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11")
   CHECK_CXX_SOURCE_COMPILES("
 #include <atomic>
-std::atomic<int> x;
+#include <cstdint>
+std::atomic<uint8_t> x1;
+std::atomic<uint16_t> x2;
+std::atomic<uint32_t> x3;
 int main() {
-  return x;
+  return ++x1 + ++x2 + ++x3;
 }
 " ${varname})
   set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})