[PATCH] choice handling fixes

A few choice handling fixes:
- only visible choice values define the new state of the complete choice
- improve handling of choices without visible value
- two new warnings

scripts/kconfig/conf.c

@@ -286,10 +286,14 @@ static int conf_choice(struct menu *menu)
 			break;
 		}
 	} else {
-		sym->user = sym->curr;
-		if (sym->curr.tri == mod) {
+		switch (sym_get_tristate_value(sym)) {
+		case no:
+			return 1;
+		case mod:
 			printf("%*s%s\n", indent - 1, "", menu_get_prompt(menu));
 			return 0;
+		case yes:
+			break;
 		}
 	}
 

scripts/kconfig/confdata.c

@@ -243,7 +243,8 @@ int conf_read(const char *name)
 		prop = sym_get_choice_prop(sym);
 		sym->flags &= ~SYMBOL_NEW;
 		for (e = prop->expr; e; e = e->left.expr)
-			sym->flags |= e->right.sym->flags & SYMBOL_NEW;
+			if (e->right.sym->visible != no)
+				sym->flags |= e->right.sym->flags & SYMBOL_NEW;
 	}
 
 	sym_change_count = 1;

scripts/kconfig/menu.c

@@ -221,11 +221,18 @@ void menu_finalize(struct menu *parent)
 	for (menu = parent->list; menu; menu = menu->next) {
 		if (sym && sym_is_choice(sym) && menu->sym) {
 			menu->sym->flags |= SYMBOL_CHOICEVAL;
+			if (!menu->prompt)
+				fprintf(stderr, "%s:%d:warning: choice value must have a prompt\n",
+					menu->file->name, menu->lineno);
 			for (prop = menu->sym->prop; prop; prop = prop->next) {
-				if (prop->type != P_DEFAULT)
-					continue;
-				fprintf(stderr, "%s:%d:warning: defaults for choice values not supported\n",
-					prop->file->name, prop->lineno);
+				if (prop->type == P_PROMPT && prop->menu != menu) {
+					fprintf(stderr, "%s:%d:warning: choice values currently only support a single prompt\n",
+						prop->file->name, prop->lineno);
+					
+				}
+				if (prop->type == P_DEFAULT)
+					fprintf(stderr, "%s:%d:warning: defaults for choice values not supported\n",
+						prop->file->name, prop->lineno);
 			}
 			current_entry = menu;
 			menu_set_type(sym->type);
@@ -311,14 +318,6 @@ bool menu_is_visible(struct menu *menu)
 	} else
 		visible = menu->prompt->visible.tri = expr_calc_value(menu->prompt->visible.expr);
 
-	if (sym && sym_is_choice(sym)) {
-		for (child = menu->list; child; child = child->next)
-			if (menu_is_visible(child))
-				break;
-		if (!child)
-			return false;
-	}
-
 	if (visible != no)
 		return true;
 	if (!sym || sym_get_tristate_value(menu->sym) == no)

scripts/kconfig/symbol.c

@@ -201,6 +201,9 @@ static struct symbol *sym_calc_choice(struct symbol *sym)
 		if (def_sym->visible != no)
 			return def_sym;
 	}
+
+	/* no choice? reset tristate value */
+	sym->curr.tri = no;
 	return NULL;
 }