From c4e3c2cd7598b2ba547d78c6882de9d5136d8700 Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Thu, 11 Nov 2021 00:54:57 +0000
Subject: [PATCH] Avoid unknown pragma GCC diagnostic warning on GCC < 9

---
 src/3rdparty/cpp-btree/btree.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/3rdparty/cpp-btree/btree.h b/src/3rdparty/cpp-btree/btree.h
index fc2ae9c9e3..97321768f7 100644
--- a/src/3rdparty/cpp-btree/btree.h
+++ b/src/3rdparty/cpp-btree/btree.h
@@ -726,7 +726,9 @@ class btree_node {
 
 #ifndef _MSC_VER
 #pragma GCC diagnostic push
+#if (__GNUC__ >= 9)
 #pragma GCC diagnostic ignored "-Wdeprecated-copy"
+#endif
 #endif /* _MSC_VER */
 
 template <typename Node, typename Reference, typename Pointer>