From: Martin Storsjo <martin@martin.st>
Date: Sun, 19 May 2013 09:54:23 +0000 (+0300)
Subject: halloc: Cast the offsetof macro to ptrdiff_t before negating
X-Git-Tag: v1.3.0~1112^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=bf8c6207786bc64716186cb2ca8955344dde6307;p=libvpx

halloc: Cast the offsetof macro to ptrdiff_t before negating

This gets rid of the warning
"C4146: unary minus applied to unsigned type, result still unsigned"
with visual c++.

Change-Id: I6eb24da983136d798221db4d3a5f50dc2857a03b
---

diff --git a/nestegg/halloc/src/macros.h b/nestegg/halloc/src/macros.h
index c36b516ee..1f84bc277 100644
--- a/nestegg/halloc/src/macros.h
+++ b/nestegg/halloc/src/macros.h
@@ -20,7 +20,7 @@
 /*
  	restore pointer to the structure by a pointer to its field
  */
-#define structof(p,t,f) ((t*)(- offsetof(t,f) + (char*)(p)))
+#define structof(p,t,f) ((t*)(- (ptrdiff_t) offsetof(t,f) + (char*)(p)))
 
 /*
  *	redefine for the target compiler