From 1d3c25e92880c6b845300bcd40666fac85c7cd71 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Sat, 13 Feb 2016 22:57:55 -0700
Subject: [PATCH] fix some c header symbol collisions

---
 c_headers/stddef.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/c_headers/stddef.h b/c_headers/stddef.h
index 7354996711..3b55d42c30 100644
--- a/c_headers/stddef.h
+++ b/c_headers/stddef.h
@@ -48,7 +48,13 @@
 #if !__has_feature(modules)
 #define _PTRDIFF_T
 #endif
+
+/* Zig: wrap in _PTRDIFF_T_DEFINED to protect against mingw defining it twice */
+#if !defined(_PTRDIFF_T_DEFINED)
 typedef __PTRDIFF_TYPE__ ptrdiff_t;
+#define _PTRDIFF_T_DEFINED
+#endif
+
 #endif
 #undef __need_ptrdiff_t
 #endif /* defined(__need_ptrdiff_t) */
@@ -59,7 +65,24 @@ typedef __PTRDIFF_TYPE__ ptrdiff_t;
 #if !__has_feature(modules)
 #define _SIZE_T
 #endif
+
+/* Zig: added to avoid collisions with mingw */
+#if !defined(_SIZE_T_DEFINED_)
+#if !defined(_SIZE_T_DEFINED)
+#if !defined(_BSD_SIZE_T_DEFINED_)
+#if !defined(_SIZE_T_DECLARED)
 typedef __SIZE_TYPE__ size_t;
+#define _SIZE_T_DEFINED_
+#define _SIZE_T_DEFINED
+#define _BSD_SIZE_T_DEFINED_
+#define _SIZE_T_DECLARED
+#endif
+#endif
+#endif
+#endif
+
+
+
 #endif
 #undef __need_size_t
 #endif /*defined(__need_size_t) */
@@ -87,7 +110,22 @@ typedef __SIZE_TYPE__ rsize_t;
 #define _WCHAR_T_DEFINED
 #endif
 #endif
+
+/* zig added to prevent duplicate definition with mingw */
+#if !defined(__INT_WCHAR_T_H)
+#if !defined(_GCC_WCHAR_T)
+#if !defined(_WCHAR_T_DECLARED)
+#if !defined(_WCHAR_T_DEFINED)
+#define __INT_WCHAR_T_H
+#define _GCC_WCHAR_T
+#define _WCHAR_T_DECLARED
+#define _WCHAR_T_DEFINED
 typedef __WCHAR_TYPE__ wchar_t;
+#endif
+#endif
+#endif
+#endif
+
 #endif
 #endif
 #undef __need_wchar_t