macro: add PTR_TO_INT() and INT_TO_PTR()

src/lxc/commands.h

@@ -29,9 +29,6 @@
 #include <unistd.h>
 
 #include "lxccontainer.h"
-/* https://developer.gnome.org/glib/2.28/glib-Type-Conversion-Macros.html */
-#define INT_TO_PTR(n) ((void *)(long)(n))
-#define PTR_TO_INT(p) ((int)(long)(p))
 #include "macro.h"
 #include "state.h"
 

src/lxc/macro.h

@@ -27,6 +27,7 @@
 #include <linux/loop.h>
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
+#include <stdint.h>
 #include <string.h>
 #include <sys/mount.h>
 #include <sys/socket.h>
@@ -266,4 +267,8 @@ extern int __build_bug_on_failed;
 #define SOCK_CLOEXEC 02000000
 #endif
 
+/* pointer conversion macros */
+#define PTR_TO_INT(p) ((int)((intptr_t)(p)))
+#define INT_TO_PTR(u) ((void *)((intptr_t)(u)))
+
 #endif /* __LXC_MACRO_H */