[Xen-changelog] [xen-unstable] Fix non-optimized compilation of Xen's memcmp

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1195911446 0
# Node ID 5e8e82e80f3b8c9c7de31be2faf04f3103dc1f7b
# Parent  96409cebd74bebbc8572cafb6ab019bbb49bdd17
Fix non-optimized compilation of Xen's memcmp

Even when using __builtin_memcmp, gcc may emit external references to
memcmp (when not optimizing for instance), so this #define does not
always provide a completely suitable memcmp().

Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxx>
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/common/string.c          |    1 +
 xen/include/asm-x86/string.h |    3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff -r 96409cebd74b -r 5e8e82e80f3b xen/common/string.c
--- a/xen/common/string.c       Sat Nov 24 13:31:39 2007 +0000
+++ b/xen/common/string.c       Sat Nov 24 13:37:26 2007 +0000
@@ -370,6 +370,7 @@ void * memmove(void * dest,const void *s
 #endif
 
 #ifndef __HAVE_ARCH_MEMCMP
+#undef memcmp
 /**
  * memcmp - Compare two areas of memory
  * @cs: One area of memory
diff -r 96409cebd74b -r 5e8e82e80f3b xen/include/asm-x86/string.h
--- a/xen/include/asm-x86/string.h      Sat Nov 24 13:31:39 2007 +0000
+++ b/xen/include/asm-x86/string.h      Sat Nov 24 13:37:26 2007 +0000
@@ -109,7 +109,8 @@ void *__memcpy(void *t, const void *f, s
 #define __HAVE_ARCH_MEMMOVE
 extern void *memmove(void *dest, const void *src, size_t n);
 
-#define __HAVE_ARCH_MEMCMP
+/* Some versions of gcc emit references to memcmp despite this macro defn. */
+/*#define __HAVE_ARCH_MEMCMP*/
 #define memcmp __builtin_memcmp
 
 static inline void *__memset_generic(void *s, char c, size_t count)

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