From 43fd9d8f3497706b0abd968c734cc7d5d73b4516 Mon Sep 17 00:00:00 2001
From: Nikolaus Demmel <nikolaus@nikolaus-demmel.de>
Date: Wed, 13 May 2020 19:36:24 +0200
Subject: [PATCH] fix compiler warning on __STDC_FORMAT_MACROS redef

Fixes #91

Without this, if I include 2 libraries that define this macro, I get warnings like

```
warning: '__STDC_FORMAT_MACROS' macro redefined [-Wmacro-redefined]
```

This is on macos 10.15 with AppleClang 11.
---
 picojson.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/picojson.h b/picojson.h
index ef4b903..708a067 100644
--- a/picojson.h
+++ b/picojson.h
@@ -75,7 +75,9 @@ extern "C" {
 
 // experimental support for int64_t (see README.mkdn for detail)
 #ifdef PICOJSON_USE_INT64
+#ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
+#endif
 #include <cerrno>
 #if __cplusplus >= 201103L
 #include <cinttypes>