From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756355AbaIZWId (ORCPT ); Fri, 26 Sep 2014 18:08:33 -0400 Received: from cpsmtpb-ews10.kpnxchange.com ([213.75.39.15]:55700 "EHLO cpsmtpb-ews10.kpnxchange.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756311AbaIZWIc (ORCPT ); Fri, 26 Sep 2014 18:08:32 -0400 Message-ID: <1411769309.15241.37.camel@x220> Subject: [PATCH 1/1] [RFC] kconfig: warn if an unknown symbol is selected From: Paul Bolle To: "Yann E. MORIN" Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org Date: Sat, 27 Sep 2014 00:08:29 +0200 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4 (3.10.4-3.fc20) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 26 Sep 2014 22:08:29.0605 (UTC) FILETIME=[67483D50:01CFD9D6] X-RcptDomain: vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A select of an unknown symbol is basically treated as a nop and is silently skipped. This is annoying if the selected symbol contains a typo. It can also hide the fact that a treewide symbol cleanup was only done partially. There are also a few cases were this might have been done on purpose. But that anti-pattern should be discouraged. Almost all select statements point to a known and reachable symbol. So people will likely assume that any selected symbol is actually set. Violating that assumption might lead to (subtle) bugs. So let's warn when we notice a select of a symbol that is not known in the configuration we're creating. Rfced-by: Paul Bolle --- scripts/kconfig/conf.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c index fef75fc756f4..de8406287531 100644 --- a/scripts/kconfig/conf.c +++ b/scripts/kconfig/conf.c @@ -446,6 +446,45 @@ static void check_conf(struct menu *menu) check_conf(child); } +static void check_selects(struct menu *menu) +{ + struct symbol *sym, *sel; + struct property *prop; + + while (menu) { + sym = menu->sym; + + if (sym && !sym_is_choice(sym) && + sym->type != S_UNKNOWN && + sym->flags & SYMBOL_WRITE) { + for_all_properties(sym, prop, P_SELECT) { + sel = prop->expr->left.sym; + if (sel->type == S_UNKNOWN && + expr_calc_value(prop->visible.expr) != no) { + fprintf(stderr, "%s:%d:warning: ", + prop->file->name, + prop->lineno); + fprintf(stderr, + "'%s' selects unknown symbol '%s'\n", + sym->name, + sel->name); + } + } + } + + if (menu->list) { + menu = menu->list; + } else if (menu->next) { + menu = menu->next; + } else while ((menu = menu->parent)) { + if (menu->next) { + menu = menu->next; + break; + } + } + } +} + static struct option long_opts[] = { {"oldaskconfig", no_argument, NULL, oldaskconfig}, {"oldconfig", no_argument, NULL, oldconfig}, @@ -681,6 +720,8 @@ int main(int ac, char **av) break; } + check_selects(rootmenu.list); + if (sync_kconfig) { /* silentoldconfig is used during the build so we shall update autoconf. * All other commands are only used to generate a config. -- 1.9.3