http://git.savannah.gnu.org/cgit/gnulib.git/commit/lib/intprops.h?id=175b4e22f99e00996b72f822f5ae54dca8243d19

 #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)                                \
--- a/oathtool/gl/intprops.h
+++ b/oathtool/gl/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)                                \
--- a/pskctool/gl/intprops.h
+++ b/pskctool/gl/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)                                \
--- a/liboath/gl/tests/intprops.h
+++ b/liboath/gl/tests/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)                                \