From 89f57708e9511f9e3ba7d69d3605cc5c942c7f94 Mon Sep 17 00:00:00 2001
From: William S Fulton <wsf@fultondesigns.co.uk>
Date: Sun, 31 Jul 2022 16:45:31 +0100
Subject: [PATCH] Suppress -Wvolatile gcc warnings in Perl headers for C++20

Seen in Perl 5.34 and earlier
---
 Lib/perl5/perlhead.swg | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Lib/perl5/perlhead.swg b/Lib/perl5/perlhead.swg
index bb7c1741d..773adee92 100644
--- a/Lib/perl5/perlhead.swg
+++ b/Lib/perl5/perlhead.swg
@@ -4,10 +4,21 @@
 #include <stdlib.h>
 extern "C" {
 #endif
+
+#if __GNUC__ >= 10
+#if defined(__cplusplus)
+#pragma GCC diagnostic ignored "-Wvolatile"
+#endif
+#endif
+
 #include "EXTERN.h"
 #include "perl.h"
 #include "XSUB.h"
 
+#if __GNUC__ >= 10
+#pragma GCC diagnostic pop
+#endif
+
 /* PERL_REVISION was added in Perl 5.6. */
 #if !defined PERL_REVISION || (PERL_REVISION-0 == 5 && PERL_VERSION-0 < 8)
 # error SWIG requires Perl >= 5.8.0