Improve performance on non-GCC hosts with __aligned__.

1 files changed, 31 insertions, 1 deletions

diff --git a/configure b/configure
index a15a9ea56a3..56701c27f5b 100755
--- a/configure
+++ b/configure
@@ -8278,6 +8278,37 @@ $as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
  esac
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for  __attribute__ ((__aligned__ (expr)))" >&5
+$as_echo_n "checking for  __attribute__ ((__aligned__ (expr)))... " >&6; }
+if ${emacs_cv_attribute_aligned+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+char __attribute__ ((__aligned__ (1 << 3))) c;
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  emacs_cv_attribute_aligned=yes
+else
+  emacs_cv_attribute_aligned=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $emacs_cv_attribute_aligned" >&5
+$as_echo "$emacs_cv_attribute_aligned" >&6; }
+if test $emacs_cv_attribute_aligned = yes; then
+
+$as_echo "#define HAVE_ATTRIBUTE_ALIGNED 1" >>confdefs.h
+
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${MAKE-make} sets \$(MAKE)" >&5
 $as_echo_n "checking whether ${MAKE-make} sets \$(MAKE)... " >&6; }
 set x ${MAKE-make}
@@ -18959,4 +18990,3 @@ if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
 $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
 fi
 
-