From 42dba9d5f4b87dfc6e43e68202285e98e4f10f91 Mon Sep 17 00:00:00 2001
From: Tormod Volden <debian.tormod@gmail.com>
Date: Sat, 13 Mar 2021 22:15:34 +0100
Subject: [PATCH 1/3] Use gmtime for gmtime_r on Windows (including MinGW)

Slightly modified from
https://redmine.webtoolkit.eu/boards/2/topics/7316

For non-Windows platforms it is declared in <time.h>

Also for MinGW it is declared if _POSIX_THREAD_SAFE_FUNCTIONS
is used, but this is not the case here.
---
 src/libkstapp/labelrenderer.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/libkstapp/labelrenderer.cpp b/src/libkstapp/labelrenderer.cpp
index 5cc66ef0..e6503a7d 100644
--- a/src/libkstapp/labelrenderer.cpp
+++ b/src/libkstapp/labelrenderer.cpp
@@ -30,6 +30,20 @@
 #include <cstdio>
 #include <time.h>
 
+#if defined (_WIN32) && !defined(_POSIX_THREAD_SAFE_FUNCTIONS)
+static struct tm* gmtime_r(const time_t* t, struct tm* r)
+{
+  // gmtime is threadsafe in Windows because it uses TLS
+  struct tm *theTm = gmtime(t);
+  if (theTm) {
+    *r = *theTm;
+    return r;
+  } else {
+    return 0;
+  }
+}
+#endif
+
 const double subscript_scale = 0.60;
 const double subscript_drop = 0.16;
 const double superscript_scale = 0.60;
-- 
2.25.1