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--- gl/xalloc-oversized.h.orig 2017-07-07 15:14:42.847504140 +0200
+++ gl/xalloc-oversized.h 2017-07-07 15:15:53.110835890 +0200
@@ -46,7 +46,7 @@
/* GCC 7 __builtin_mul_overflow should easily compute this. See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68120 */
#if 7 <= __GNUC__
-# define xalloc_oversized(n, s) __builtin_mul_overflow (n, s, (size_t *) NULL)
+# define xalloc_oversized(n, s) __builtin_mul_overflow_p (n, s, (size_t) 1)
/* GCC 5 and Clang __builtin_mul_overflow needs a temporary, and
should be used only for non-constant operands, so that
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