This incorporates:
2017-05-25 port to recent icc
* lib/intprops.h: Copy from gnulib.
: (max) >> (b) < (a))
/* True if __builtin_add_overflow (A, B, P) works when P is non-null. */
-#define _GL_HAS_BUILTIN_OVERFLOW (5 <= __GNUC__)
+#if 5 <= __GNUC__ && !defined __ICC
+# define _GL_HAS_BUILTIN_OVERFLOW 1
+#else
+# define _GL_HAS_BUILTIN_OVERFLOW 0
+#endif
/* True if __builtin_add_overflow_p (A, B, C) works. */
#define _GL_HAS_BUILTIN_OVERFLOW_P (7 <= __GNUC__)