C compilers can, and some do, optimize away pointer underflow checks.

Cast the pointers to uintptr_t; use AC_TYPE_UINTPTR_T to get uintptr_t
defined on older platforms that don't define it themselves.

1 files changed, 7 insertions, 0 deletions

diff --git a/config.h.in b/config.h.in
index 11ce977b..914289a8 100644
--- a/config.h.in
+++ b/config.h.in
@@ -217,6 +217,9 @@
 /* Define to 1 if you have the <sys/types.h> header file. */
 #undef HAVE_SYS_TYPES_H
 
+/* Define to 1 if the system has the type `uintptr_t'. */
+#undef HAVE_UINTPTR_T
+
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
@@ -388,3 +391,7 @@
 /* Define to the type of an unsigned integer type of width exactly 8 bits if
    such a type exists and the standard includes do not define it. */
 #undef uint8_t
+
+/* Define to the type of an unsigned integer type wide enough to hold a
+   pointer, if such a type exists, and if the system does not define it. */
+#undef uintptr_t