From d77da05c1708ebe19c322ad8fe48bb793cb98228 Mon Sep 17 00:00:00 2001
From: Giovanni Cerretani <giovanni.cerretani@gmail.com>
Date: Wed, 25 Aug 2021 17:25:27 +0200
Subject: [PATCH] Fix #2975

Define JSON_DIAGNOSTICS to 0 if not defined to fix annoying Wundef warnings.
---
 include/nlohmann/detail/macro_scope.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/nlohmann/detail/macro_scope.hpp b/include/nlohmann/detail/macro_scope.hpp
index 400530a60..76a0dc62c 100644
--- a/include/nlohmann/detail/macro_scope.hpp
+++ b/include/nlohmann/detail/macro_scope.hpp
@@ -301,3 +301,7 @@
 #else
     #define JSON_EXPLICIT explicit
 #endif
+
+#ifndef JSON_DIAGNOSTICS
+    #define JSON_DIAGNOSTICS 0
+#endif