From a326ec839ae2123d9464d4f96d732e610f144d23 Mon Sep 17 00:00:00 2001
From: "Bruce A. Mah" <bmah@es.net>
Date: Thu, 13 Apr 2023 14:43:39 -0700
Subject: [PATCH] Add autoconf test for stdatomic

Also do conditional compilation for stdatomic and pthread.
---
 configure.ac    | 3 +++
 src/iperf.h     | 7 ++++++-
 src/iperf_api.h | 4 +++-
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 7521f0d1c..92b9ced52 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,6 +91,9 @@ CC="$PTHREAD_CC"
 CXX="$PTHREAD_CXX"
 ])
 
+# Atomics
+AC_CHECK_HEADERS([stdatomic.h])
+
 # Check for poll.h (it's in POSIX so everyone should have it?)
 AC_CHECK_HEADERS([poll.h])
 
diff --git a/src/iperf.h b/src/iperf.h
index 87b7b0ed2..87f787fd5 100644
--- a/src/iperf.h
+++ b/src/iperf.h
@@ -1,5 +1,5 @@
 /*
- * iperf, Copyright (c) 2014-2020, The Regents of the University of
+ * iperf, Copyright (c) 2014-2020, 2023, The Regents of the University of
  * California, through Lawrence Berkeley National Laboratory (subject
  * to receipt of any required approvals from the U.S. Dept. of
  * Energy).  All rights reserved.
@@ -73,8 +73,13 @@
 #include <openssl/evp.h>
 #endif // HAVE_SSL
 
+#ifdef HAVE_PTHREAD
 #include <pthread.h>
+#endif // HAVE_PTHREAD
+
+#ifdef HAVE_STDATOMIC_H
 #include <stdatomic.h>
+#endif // HAVE_STDATOMIC_H
 
 #if !defined(__IPERF_API_H)
 //typedef uint64_t iperf_size_t;
diff --git a/src/iperf_api.h b/src/iperf_api.h
index 1c2cb7ec3..fd2ab6bc6 100644
--- a/src/iperf_api.h
+++ b/src/iperf_api.h
@@ -1,5 +1,5 @@
 /*
- * iperf, Copyright (c) 2014-2022, The Regents of the University of
+ * iperf, Copyright (c) 2014-2023, The Regents of the University of
  * California, through Lawrence Berkeley National Laboratory (subject
  * to receipt of any required approvals from the U.S. Dept. of
  * Energy).  All rights reserved.
@@ -38,7 +38,9 @@
 extern "C" { /* open extern "C" */
 #endif
 
+#ifdef HAVE_STDATOMIC_H
 #include <stdatomic.h>
+#endif // HAVE_STDATOMIC_H
 
 struct iperf_test;
 struct iperf_stream_result;