Hi Yann,
On Tue, 2014-09-30 at 20:09 +0200, Paul Bolle wrote:
> 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. Selects that violate
> this assumption can only be spotted by checking multiple Kconfig files,
> often across architectures. It is unlikely that people will do this
> regularly.
>
> So let's warn when we notice a select of a symbol that is not known in
> the configuration we're creating.
>
> Signed-off-by: Paul Bolle <pebo...@tiscali.nl>
> Acked-by: Michal Marek <mma...@suse.cz>
> ---
> First sent as an RFC in https://lkml.org/lkml/2014/9/26/887 (and
> https://lkml.org/lkml/2014/9/26/886 for the cover letter).
>
> Small modification to the commit explanation in comparison to the RFC,
> but identical patch. Minor edits to the cover-letter too.
I've gotten no reaction from you yet on this patch nor on the preceding
RFC. There have been a handful of other kconfig patches flying by the
last half year or so (at least, that I know of). None of those have
gotten any reaction from you, as far as I can tell.
Do you expect to handle this patch (and whatever has been submitted
lately by other people) in the near future?
> 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.
Regards,
Paul Bolle
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