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[PATCH] Fix -Wundef warning on PAGE_COPY_THRESHOLD

The PAGE_COPY_THRESHOLD macro is meant to be overridden by
architecture-specific pagecopy.h, but it is currently done only by
mach; all other architectures use the default.  Check to see if the
macro is defined in addition to whether it is set to a non-zero value.

Verified that the generated code is unchanged on x86_64.

Siddhesh

	* sysdeps/generic/pagecopy.h: Also check if
	PAGE_COPY_THRESHOLD is defined.

---
 sysdeps/generic/pagecopy.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sysdeps/generic/pagecopy.h b/sysdeps/generic/pagecopy.h
index 2c35b71..2862270 100644
--- a/sysdeps/generic/pagecopy.h
+++ b/sysdeps/generic/pagecopy.h
@@ -39,7 +39,7 @@
 */
 
 
-#if PAGE_COPY_THRESHOLD
+#if defined PAGE_COPY_THRESHOLD && PAGE_COPY_THRESHOLD
 
 #include <assert.h>
 
-- 
1.9.3

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