gtk: Support GTK without VTE

GTK without VTE is needed for hosts which don't support VTE (for example
all variants of MinGW), but it can also be reasonable for other hosts.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

configure

@@ -318,6 +318,7 @@ glusterfs_zerofill="no"
 virtio_blk_data_plane=""
 gtk=""
 gtkabi="2.0"
+vte=""
 tpm="no"
 libssh2=""
 vhdx=""
@@ -1063,6 +1064,10 @@ for opt do
   ;;
   --with-gtkabi=*) gtkabi="$optarg"
   ;;
+  --disable-vte) vte="no"
+  ;;
+  --enable-vte) vte="yes"
+  ;;
   --enable-tpm) tpm="yes"
   ;;
   --disable-libssh2) libssh2="no"
@@ -1946,30 +1951,41 @@ if test "$gtk" != "no"; then
     gtkpackage="gtk+-$gtkabi"
     if test "$gtkabi" = "3.0" ; then
       gtkversion="3.0.0"
+    else
+      gtkversion="2.18.0"
+    fi
+    if $pkg_config --exists "$gtkpackage >= $gtkversion"; then
+        gtk_cflags=`$pkg_config --cflags $gtkpackage`
+        gtk_libs=`$pkg_config --libs $gtkpackage`
+        libs_softmmu="$gtk_libs $libs_softmmu"
+        gtk="yes"
+    elif test "$gtk" = "yes"; then
+        feature_not_found "gtk" "Install gtk2 or gtk3 (requires --with-gtkabi=3.0 option to configure) devel"
+    else
+        gtk="no"
+    fi
+fi
+
+##########################################
+# VTE probe
+
+if test "$vte" != "no"; then
+    if test "$gtkabi" = "3.0"; then
       vtepackage="vte-2.90"
       vteversion="0.32.0"
     else
-      gtkversion="2.18.0"
       vtepackage="vte"
       vteversion="0.24.0"
     fi
-    if ! $pkg_config --exists "$gtkpackage >= $gtkversion"; then
-        if test "$gtk" = "yes" ; then
-            feature_not_found "gtk" "Install gtk2 or gtk3 (requires --with-gtkabi=3.0 option to configure) devel"
-        fi
-        gtk="no"
-    elif ! $pkg_config --exists "$vtepackage >= $vteversion"; then
-        if test "$gtk" = "yes" ; then
-            error_exit "libvte not found (required for gtk support)"
-        fi
-        gtk="no"
+    if $pkg_config --exists "$vtepackage >= $vteversion"; then
+        vte_cflags=`$pkg_config --cflags $vtepackage`
+        vte_libs=`$pkg_config --libs $vtepackage`
+        libs_softmmu="$vte_libs $libs_softmmu"
+        vte="yes"
+    elif test "$vte" = "yes"; then
+        feature_not_found "vte" "Install libvte or libvte-2.90 (requires --with-gtkabi=3.0 option to configure) devel"
     else
-	gtk_cflags=`$pkg_config --cflags $gtkpackage`
-	gtk_libs=`$pkg_config --libs $gtkpackage`
-	vte_cflags=`$pkg_config --cflags $vtepackage`
-	vte_libs=`$pkg_config --libs $vtepackage`
-	libs_softmmu="$gtk_libs $vte_libs $libs_softmmu"
-	gtk="yes"
+        vte="no"
     fi
 fi
 
@@ -4053,6 +4069,7 @@ fi
 echo "pixman            $pixman"
 echo "SDL support       $sdl"
 echo "GTK support       $gtk"
+echo "VTE support       $vte"
 echo "curses support    $curses"
 echo "curl support      $curl"
 echo "mingw32 support   $mingw32"
@@ -4381,6 +4398,9 @@ echo "GLIB_CFLAGS=$glib_cflags" >> $config_host_mak
 if test "$gtk" = "yes" ; then
   echo "CONFIG_GTK=y" >> $config_host_mak
   echo "GTK_CFLAGS=$gtk_cflags" >> $config_host_mak
+fi
+if test "$vte" = "yes" ; then
+  echo "CONFIG_VTE=y" >> $config_host_mak
   echo "VTE_CFLAGS=$vte_cflags" >> $config_host_mak
 fi
 if test "$xen" = "yes" ; then

ui/gtk.c

@@ -54,7 +54,9 @@
 #include <gdk/gdkkeysyms.h>
 #include <glib/gi18n.h>
 #include <locale.h>
+#if defined(CONFIG_VTE)
 #include <vte/vte.h>
+#endif
 #include <math.h>
 
 #include "trace.h"
@@ -68,6 +70,9 @@
 
 #define MAX_VCS 10
 
+#if !defined(CONFIG_VTE)
+# define VTE_CHECK_VERSION(a, b, c) 0
+#endif
 
 /* Compatibility define to let us build on both Gtk2 and Gtk3 */
 #if GTK_CHECK_VERSION(3, 0, 0)
@@ -105,8 +110,10 @@ typedef struct VirtualConsole
 {
     GtkWidget *menu_item;
     GtkWidget *terminal;
+#if defined(CONFIG_VTE)
     GtkWidget *scrolled_window;
     CharDriverState *chr;
+#endif
     int fd;
 } VirtualConsole;
 
@@ -1063,6 +1070,7 @@ static void gd_change_page(GtkNotebook *nb, gpointer arg1, guint arg2,
     if (arg2 == 0) {
         gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(s->vga_item), TRUE);
     } else {
+#if defined(CONFIG_VTE)
         VirtualConsole *vc = &s->vc[arg2 - 1];
         VteTerminal *term = VTE_TERMINAL(vc->terminal);
         int width, height;
@@ -1072,6 +1080,9 @@ static void gd_change_page(GtkNotebook *nb, gpointer arg1, guint arg2,
 
         gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(vc->menu_item), TRUE);
         gtk_widget_set_size_request(vc->terminal, width, height);
+#else
+        g_assert_not_reached();
+#endif
     }
 
     gtk_widget_set_sensitive(s->grab_item, on_vga);
@@ -1117,7 +1128,7 @@ static int gd_vc_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
 {
     VirtualConsole *vc = chr->opaque;
 
-    return write(vc->fd, buf, len);
+    return vc ? write(vc->fd, buf, len) : len;
 }
 
 static int nb_vcs;
@@ -1142,6 +1153,7 @@ void early_gtk_display_init(void)
     register_vc_handler(gd_vc_handler);
 }
 
+#if defined(CONFIG_VTE)
 static gboolean gd_vc_in(GIOChannel *chan, GIOCondition cond, void *opaque)
 {
     VirtualConsole *vc = opaque;
@@ -1157,10 +1169,12 @@ static gboolean gd_vc_in(GIOChannel *chan, GIOCondition cond, void *opaque)
 
     return TRUE;
 }
+#endif
 
 static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSList *group,
                           GtkWidget *view_menu)
 {
+#if defined(CONFIG_VTE)
     const char *label;
     char buffer[32];
     char path[32];
@@ -1230,6 +1244,7 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
     chan = g_io_channel_unix_new(vc->fd);
     g_io_add_watch(chan, G_IO_IN, gd_vc_in, vc);
 
+#endif /* CONFIG_VTE */
     return group;
 }