check for typeof() and define HAVE_TYPEOF if available so that we use

the proper implementation of __container_of from xorg's list.h

ok kettenis@

driver/xf86-video-intel/config.h.in

@@ -129,6 +129,9 @@
 /* Define to 1 if you have the <sys/types.h> header file. */
 #undef HAVE_SYS_TYPES_H
 
+/* Define to 1 if typeof works with your compiler. */
+#undef HAVE_TYPEOF
+
 /* Enable udev-based monitor hotplug detection */
 #undef HAVE_UDEV
 
@@ -257,3 +260,6 @@
 
 /* Define for large files, on AIX-style hosts. */
 #undef _LARGE_FILES
+
+/* Define to __typeof__ if your compiler spells it that way. */
+#undef typeof

driver/xf86-video-intel/configure

@@ -18527,6 +18527,61 @@ fi
 done
 
 
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for typeof syntax and keyword spelling" >&5
+$as_echo_n "checking for typeof syntax and keyword spelling... " >&6; }
+if ${ac_cv_c_typeof+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_cv_c_typeof=no
+     for ac_kw in typeof __typeof__ no; do
+       test $ac_kw = no && break
+       cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+	   int value;
+	   typedef struct {
+		   char a [1
+			   + ! (($ac_kw (value))
+				(($ac_kw (value)) 0 < ($ac_kw (value)) -1
+				 ? ($ac_kw (value)) - 1
+				 : ~ (~ ($ac_kw (value)) 0
+				      << sizeof ($ac_kw (value)))))]; }
+	      ac__typeof_type_;
+	   return
+	     (! ((void) ((ac__typeof_type_ *) 0), 0));
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_c_typeof=$ac_kw
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+       test $ac_cv_c_typeof != no && break
+     done
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_typeof" >&5
+$as_echo "$ac_cv_c_typeof" >&6; }
+  if test $ac_cv_c_typeof != no; then
+
+$as_echo "#define HAVE_TYPEOF 1" >>confdefs.h
+
+    if test $ac_cv_c_typeof != typeof; then
+
+cat >>confdefs.h <<_ACEOF
+#define typeof $ac_cv_c_typeof
+_ACEOF
+
+    fi
+  fi
+
+
 # Platform specific settings
 case $host_os in
   *linux*)

driver/xf86-video-intel/configure.ac

@@ -65,6 +65,8 @@ AC_SYS_LARGEFILE
 # Check for common libc routines redefined by os.h
 AC_CHECK_FUNCS([strlcpy strlcat strndup], [], [])
 
+AC_C_TYPEOF
+
 # Platform specific settings
 case $host_os in
   *linux*)

driver/xf86-video-intel/src/intel_list.h

@@ -305,9 +305,15 @@ list_is_empty(const struct list *head)
 #define list_last_entry(ptr, type, member) \
     list_entry((ptr)->prev, type, member)
 
+/*
+ * Do not redefine __container_of, we better off using the one in xorg/list.h.
+ */
+#ifndef __container_of
 #define __container_of(ptr, sample, member)				\
     (void *)((char *)(ptr)						\
 	     - ((char *)&(sample)->member - (char *)(sample)))
+#endif
+
 /**
  * Loop through the list given by head and set pos to struct in the list.
  *