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http://git.savannah.gnu.org/cgit/gnulib.git/commit/lib/intprops.h?id=175b4e22f99e00996b72f822f5ae54dca8243d19
--- diffutils-3.5/lib/intprops.h
+++ diffutils-3.5/lib/intprops.h
@@ -230,11 +230,11 @@
(e.g., A and B) have the same type as MIN and MAX. Instead, they assume
that the result (e.g., A + B) has that type. */
#if _GL_HAS_BUILTIN_OVERFLOW_WITH_NULL
-# define _GL_ADD_OVERFLOW(a, b, min, max)
+# define _GL_ADD_OVERFLOW(a, b, min, max) \
__builtin_add_overflow (a, b, (__typeof__ ((a) + (b)) *) 0)
-# define _GL_SUBTRACT_OVERFLOW(a, b, min, max)
+# define _GL_SUBTRACT_OVERFLOW(a, b, min, max) \
__builtin_sub_overflow (a, b, (__typeof__ ((a) - (b)) *) 0)
-# define _GL_MULTIPLY_OVERFLOW(a, b, min, max)
+# define _GL_MULTIPLY_OVERFLOW(a, b, min, max) \
__builtin_mul_overflow (a, b, (__typeof__ ((a) * (b)) *) 0)
#else
# define _GL_ADD_OVERFLOW(a, b, min, max) \
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