Cleanup XEditRes hack

* configure.ac [USE_X_TOOLKIT]: Define X_TOOLKIT_EDITRES if
_XEditResCheckMessages is declared in X11/Xmu/Editres.h and may be
linked with -lXmu.  This should work with any non-ancient Xmu library.
* xfns.c (toplevel): Remove old cruft.
(x_window) [USE_X_TOOLKIT]: Use X_TOOLKIT_EDITRES.
* xterm.c (toplevel): Remove old cruft.
(handle_one_xevent): Use X_TOOLKIT_EDITRES.
* xterm.h (toplevel): Include X11/Xmu/Editres.h if X_TOOLKIT_EDITRES.

configure.ac

@@ -4287,23 +4287,32 @@ else
     [Returns true if character is any form of separator.])
 fi
 
-AH_TEMPLATE(NO_EDITRES, [Define if XEditRes should not be used.])
-
-case $opsys in
-  aix4-2)
-    dnl Unfortunately without libXmu we cannot support EditRes.
-    if test "x$ac_cv_search_XmuConvertStandardSelection" = xno; then
-      AC_DEFINE(NO_EDITRES, 1)
+if test "$USE_X_TOOLKIT" != "none"; then
+  have_editres=yes
+  case $opsys in
+    hpux*)
+      dnl Assar Westerlund <assar@sics.se> says this is necessary
+      dnl for HP-UX 10.20, and that it works for HP-UX 0 as well.
+      have_editres=no
+    ;;
+  esac
+  if test "$have_editres" != no && test ! -z "$LIBXMU"; then
+    OLDLIBS="$LIBS"
+    dnl See libXmu.a check above.
+    if test x$HAVE_X11XTR6 = xyes; then
+      LIBS="-lXt -lSM -lICE $LIBXMU"
+    else
+      OTHERLIBS="-lXt -$LIBXMU"
     fi
-    ;;
-
-  hpux*)
-    dnl Assar Westerlund <assar@sics.se> says this is necessary for
-    dnl HP-UX 10.20, and that it works for HP-UX 0 as well.
-    AC_DEFINE(NO_EDITRES, 1)
-    ;;
-esac
-
+    AC_TRY_LINK(
+      [#include <X11/Intrinsic.h>
+       #include <X11/Xmu/Editres.h>],
+      [_XEditResCheckMessages (0, 0, 0, 0);],
+      [AC_DEFINE([X_TOOLKIT_EDITRES], 1,
+        [Define to 1 if we should use XEditRes.])])
+    LIBS=$OLDLIBS
+  fi
+fi
 
 case $opsys in
   sol2* | unixware )

src/xfns.c

@@ -91,11 +91,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "../lwlib/xlwmenu.h"
 #endif
 
-#if !defined (NO_EDITRES)
-#define HACK_EDITRES
-extern void _XEditResCheckMessages (Widget, XtPointer, XEvent *, Boolean *);
-#endif /* not defined NO_EDITRES */
-
 /* Unique id counter for widgets created by the Lucid Widget Library.  */
 
 extern LWLIB_ID widget_id_tick;
@@ -2662,7 +2657,7 @@ x_window (struct frame *f, long window_prompting)
 
   hack_wm_protocols (f, shell_widget);
 
-#ifdef HACK_EDITRES
+#ifdef X_TOOLKIT_EDITRES
   XtAddEventHandler (shell_widget, 0, True, _XEditResCheckMessages, 0);
 #endif
 

src/xterm.c

@@ -95,10 +95,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #endif
 
 #ifdef USE_X_TOOLKIT
-#if !defined (NO_EDITRES)
-#define HACK_EDITRES
-extern void _XEditResCheckMessages (Widget, XtPointer, XEvent *, Boolean *);
-#endif /* not NO_EDITRES */
 
 /* Include toolkit specific headers for the scroll bar widget.  */
 
@@ -7610,7 +7606,7 @@ handle_one_xevent (struct x_display_info *dpyinfo,
 	    goto done;
           }
 
-#ifdef HACK_EDITRES
+#ifdef X_TOOLKIT_EDITRES
         if (event->xclient.message_type == dpyinfo->Xatom_editres)
           {
 	    f = any;
@@ -7619,7 +7615,7 @@ handle_one_xevent (struct x_display_info *dpyinfo,
 				      NULL, (XEvent *) event, NULL);
 	    goto done;
           }
-#endif /* HACK_EDITRES */
+#endif /* X_TOOLKIT_EDITRES */
 
         if (event->xclient.message_type == dpyinfo->Xatom_DONE
 	    || event->xclient.message_type == dpyinfo->Xatom_PAGE)

src/xterm.h

@@ -38,6 +38,10 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <X11/CoreP.h>		/* foul, but we need this to use our own
 				   window inside a widget instead of one
 				   that Xt creates... */
+#ifdef X_TOOLKIT_EDITRES
+#include <X11/Xmu/Editres.h>
+#endif
+
 typedef Widget xt_or_gtk_widget;
 #endif