From: Sebastian Ramacher <sramacher@debian.org>
Date: Fri, 29 Oct 2021 11:15:29 +0200
Subject: Link atomic if necessary

---
 meson.build | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/meson.build b/meson.build
index a624141..ce7956b 100644
--- a/meson.build
+++ b/meson.build
@@ -486,6 +486,25 @@ else # system not darwin or windows
   ]
 endif # system
 
+test_atomic = '''
+#include <atomic>
+int main(void)
+{
+  std::atomic<int64_t> v;
+  v = -1;
+  return 0;
+}
+'''
+
+cxx = meson.get_compiler('cpp')
+if not cxx.links(test_atomic, name: 'std::atomic<int64_t> without libatomic')
+  libatomic = cxx.find_library('atomic', required: false)
+  if cxx.links(test_atomic, dependencies: libatomic, name: 'std::atomic<int64_t> with libatomic')
+    general_dependencies += libatomic
+  else
+    error('8-byte atomic operations are required')
+  endif
+endif
 
 general_include_dirs += get_option('extra_include_dirs')
 general_compile_args = [ arch_flags, feature_defines ]