optimize qemu building in Makefile

Makefile

@@ -1,6 +1,3 @@
-# $Id: Makefile,v 1.29 2008/12/11 12:18:17 ecd Exp $
-#
-
 TARGET = x49gpng
 TARGET_ALLCAPS = X49GPNG
 
@@ -165,7 +162,9 @@ $(QEMU_DIR)/config-host.h:
 	./configure-small --extra-cflags=-DX49GP; \
 	$(MAKE) -f Makefile-small )
 
-$(QEMU_OBJS): dummy
+$(QEMU_OBJS): qemu-objs
+
+qemu-objs:
 	+$(MAKE) -C $(QEMU_DIR) -f Makefile-small
 
 clean-qemu:
@@ -230,5 +229,3 @@ install: all dist/$(TARGET).desktop dist/$(TARGET).man
 	install -D -m 644 dist/$(TARGET).desktop "$(DESTDIR)$(INSTALL_MENU_DIR)/$(TARGET).desktop"
 	install -D -m 644 dist/$(TARGET).man "$(DESTDIR)$(INSTALL_MAN_DIR)/$(TARGET).1"
 	cp -R dist/firmware/ "$(DESTDIR)$(INSTALL_DATA_DIR)/firmware"
-
-dummy:

src/x49gpng/options.c

@@ -28,6 +28,7 @@ void config_init( char* progname, int argc, char* argv[] )
     opt.firmware = NULL;
     opt.model = MODEL_50G;
     opt.name = NULL;
+    opt.scale = 1.0;
 
 #if defined( __linux__ )
     opt.font = "urw gothic l";
@@ -52,6 +53,7 @@ void config_init( char* progname, int argc, char* argv[] )
         {"49gp",         no_argument,       NULL, 496},
         {"49gp-newrpl",  no_argument,       NULL, 497},
         {"name",         required_argument, NULL, 'n'},
+        {"scale",         required_argument, NULL, 's'},
 
         {"font",         required_argument, NULL, 't'},
 
@@ -74,7 +76,8 @@ void config_init( char* progname, int argc, char* argv[] )
                          "    --49gp                    show HP 49g+ faceplate\n"
                          "    --49gp-newrpl             show HP 49g+ faceplate with newRPL labels\n"
                          " -n --name[=<name>]           set alternate UI name\n"
-                         " -t --font[=<fontname>]           set alternate UI font\n"
+                         " -t --font[=<fontname>]       set alternate UI font\n"
+                         " -s --scale[=<X.x>]           scale GUI by X.x\n"
                          " -D --enable-debug[=<port>]   enable the debugger interface\n"
                          "                              (default port: %u)\n"
                          " -d --debug                   use along -D to also start the debugger immediately\n"
@@ -126,6 +129,9 @@ void config_init( char* progname, int argc, char* argv[] )
             case 'n':
                 opt.name = strdup( optarg );
                 break;
+            case 's':
+                opt.scale = atof( optarg );
+                break;
             case 't':
                 opt.font = strdup( optarg );
                 break;

src/x49gpng/options.h

@@ -26,6 +26,7 @@ struct options {
     char* name;
 
     char* font;
+    double scale;
 };
 
 extern struct options opt;