New file, defining AC_MBSTATE_T_OBJECT.

diff --git a/m4/mbstate_t.m4 b/m4/mbstate_t.m4
new file mode 100644 (file)
index 0000000..4cbbfd5
--- /dev/null
+++ b/m4/mbstate_t.m4
@@ -0,0 +1,18 @@
+# serial 1
+
+# From Paul Eggert.
+
+# Some versions of BeOS define mbstate_t to be an incomplete type,
+# so you can't declare an object of that type.
+# Check for this incompatibility with Standard C.
+
+AC_DEFUN(AC_MBSTATE_T_OBJECT,
+  [AC_CACHE_CHECK([for mbstate_t object type], ac_cv_type_mbstate_t_object,
+    [AC_TRY_COMPILE([#include <wchar.h>],
+      [mbstate_t x; return sizeof x;],
+      ac_cv_type_mbstate_t_object=yes,
+      ac_cv_type_mbstate_t_object=no)])
+   if test $ac_cv_type_mbstate_t_object = yes; then
+     AC_DEFINE(HAVE_MBSTATE_T_OBJECT, 1,
+              [Define if mbstate_t is an object type.])
+   fi])