+AC_CACHE_CHECK([for __attribute__ ((__aligned__ (expr)))],
+ [emacs_cv_attribute_aligned],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[char __attribute__ ((__aligned__ (1 << 3))) c;]],
+ [[]])],
+ [emacs_cv_attribute_aligned=yes],
+ [emacs_cv_attribute_aligned=no])])
+if test $emacs_cv_attribute_aligned = yes; then
+ AC_DEFINE([HAVE_ATTRIBUTE_ALIGNED], 1,
+ [Define to 1 if GCC-style __attribute__ ((__aligned__ (expr))) works.])
+fi
+