patch 8.1.2344: Cygwin: warning for using strptime()
Problem: Cygwin: warning for using strptime().
Solution: Move defining _XOPEN_SOURCE and __USE_XOPEN to vim.h. (Ken Takata,
closes #5265) Use 700 for _XOPEN_SOURCE for mkdtemp().
diff --git a/src/vim.h b/src/vim.h
index 4d409d4..c53b141 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -36,8 +36,21 @@
Error: configure did not run properly. Check auto/config.log.
# endif
+# ifdef UNIX
+// Needed for strptime(). Needs to be done early, since header files can
+// include other header files and end up including time.h, where these symbols
+// matter for Vim.
+// 700 is needed for mkdtemp().
+# ifndef _XOPEN_SOURCE
+# define _XOPEN_SOURCE 700
+# endif
+# ifndef __USE_XOPEN
+# define __USE_XOPEN
+# endif
+# endif
+
// for INT_MAX, LONG_MAX et al.
-#include <limits.h>
+# include <limits.h>
/*
* Cygwin may have fchdir() in a newer release, but in most versions it