kconfig: add named choice group

As choice dependency are now fully checked, it's quite easy to add support
for named choices. This lifts the restriction that a choice value can only
appear once, although it still has to be within the same group,
but multiple choices can be joined by giving them a name.
While at it I cleaned up a little the choice type logic to simplify it a
bit.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 27 insertions, 37 deletions

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 606ceb9e746e..07ff8d105c9d 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -235,18 +235,22 @@ void menu_finalize(struct menu *parent)
         sym = parent->sym;
         if (parent->list) {
                 if (sym && sym_is_choice(sym)) {
-                        /* find the first choice value and find out choice type */
-                        for (menu = parent->list; menu; menu = menu->next) {
-                                if (menu->sym) {
-                                        current_entry = parent;
-                                        if (sym->type == S_UNKNOWN)
+                        if (sym->type == S_UNKNOWN) {
+                                /* find the first choice value to find out choice type */
+                                current_entry = parent;
+                                for (menu = parent->list; menu; menu = menu->next) {
+                                        if (menu->sym && menu->sym->type != S_UNKNOWN) {
                                                 menu_set_type(menu->sym->type);
-                                        current_entry = menu;
-                                        if (menu->sym->type == S_UNKNOWN)
-                                                menu_set_type(sym->type);
-                                        break;
+                                                break;
+                                        }
                                 }
                         }
+                        /* set the type of the remaining choice values */
+                        for (menu = parent->list; menu; menu = menu->next) {
+                                current_entry = menu;
+                                if (menu->sym && menu->sym->type == S_UNKNOWN)
+                                        menu_set_type(sym->type);
+                        }
                         parentdep = expr_alloc_symbol(sym);
                 } else if (parent->prompt)
                         parentdep = parent->prompt->visible.expr;
@@ -313,50 +317,36 @@ void menu_finalize(struct menu *parent)
                 }
         }
         for (menu = parent->list; menu; menu = menu->next) {
-                if (sym && sym_is_choice(sym) && menu->sym) {
+                if (sym && sym_is_choice(sym) &&
+                    menu->sym && !sym_is_choice_value(menu->sym)) {
+                        current_entry = menu;
                         menu->sym->flags |= SYMBOL_CHOICEVAL;
                         if (!menu->prompt)
                                 menu_warn(menu, "choice value must have a prompt");
                         for (prop = menu->sym->prop; prop; prop = prop->next) {
-                                if (prop->type == P_PROMPT && prop->menu != menu) {
-                                        prop_warn(prop, "choice values "
-                                            "currently only support a "
-                                            "single prompt");
-                                }
                                 if (prop->type == P_DEFAULT)
                                         prop_warn(prop, "defaults for choice "
-                                            "values not supported");
+                                                  "values not supported");
+                                if (prop->menu == menu)
+                                        continue;
+                                if (prop->type == P_PROMPT &&
+                                    prop->menu->parent->sym != sym)
+                                        prop_warn(prop, "choice value used outside its choice group");
                         }
-                        current_entry = menu;
-                        if (menu->sym->type == S_UNKNOWN)
-                                menu_set_type(sym->type);
                         /* Non-tristate choice values of tristate choices must
                          * depend on the choice being set to Y. The choice
                          * values' dependencies were propagated to their
                          * properties above, so the change here must be re-
-                         * propagated. */
+                         * propagated.
+                         */
                         if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
                                 basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
-                                basedep = expr_alloc_and(basedep, menu->dep);
-                                basedep = expr_eliminate_dups(basedep);
-                                menu->dep = basedep;
+                                menu->dep = expr_alloc_and(basedep, menu->dep);
                                 for (prop = menu->sym->prop; prop; prop = prop->next) {
                                         if (prop->menu != menu)
                                                 continue;
-                                        dep = expr_alloc_and(expr_copy(basedep),
-                                                             prop->visible.expr);
-                                        dep = expr_eliminate_dups(dep);
-                                        dep = expr_trans_bool(dep);
-                                        prop->visible.expr = dep;
-                                        if (prop->type == P_SELECT) {
-                                                struct symbol *es = prop_get_symbol(prop);
-                                                dep2 = expr_alloc_symbol(menu->sym);
-                                                dep = expr_alloc_and(dep2,
-                                                                     expr_copy(dep));
-                                                dep = expr_alloc_or(es->rev_dep.expr, dep);
-                                                dep = expr_eliminate_dups(dep);
-                                                es->rev_dep.expr = dep;
-                                        }
+                                        prop->visible.expr = expr_alloc_and(expr_copy(basedep),
+                                                                            prop->visible.expr);
                                 }
                         }
                         menu_add_symbol(P_CHOICE, sym, NULL);