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at-spi2-core: fix alignof m4 macro

DBIND_CHECK_ALIGNOF does not work when cross-compiling, so we modify
it to use AC_CHECK_ALIGNOF.

Upstream-Status:  Pending

Signed-off-by: joe.slater@windriver.com


--- a/acinclude.m4
+++ b/acinclude.m4
@@ -2,7 +2,26 @@
 # type alignment test #
 #######################
 
-AC_DEFUN([DBIND_CHECK_ALIGNOF],
+AC_DEFUN([DBIND_CHECK_ALIGNOF],[
+AC_CHECK_ALIGNOF($1,[
+#include <stdio.h>
+#include <stdlib.h>
+#define DBUS_API_SUBJECT_TO_CHANGE
+#include <dbus/dbus.h>
+typedef struct {char s1;} dbind_struct;
+typedef void *dbind_pointer;
+])
+
+dnl Note that we substitute for names like @DBIND_ALIGNOF_DBIND_STRUCT@, but
+dnl we #define names like ALIGNOF_DBIND_STRUCT in config.h!
+dnl
+AC_SUBST(translit(dbind_alignof_$1, [a-z *], [A-Z_P]),[$ac_cv_alignof_$1])
+
+])
+
+dnl The following does not work for cross-compilation.
+dnl
+AC_DEFUN([xDBIND_CHECK_ALIGNOF],
 	[changequote(<<, >>)dnl
 	dnl The name to #define.
 	define(<<AC_TYPE_NAME>>,