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Auto merge of #93466 - cjgillot:query-dead, r=nagisa

Make dead code check a query.

Dead code check is run for each invocation of the compiler, even if no modifications were involved.
This PR makes dead code check a query keyed on the module. This allows to skip the check when a module has not changed.
To perform this, a query `live_symbols_and_ignored_derived_traits` is introduced to encapsulate the global analysis of finding live symbols. The second query `check_mod_deathness` outputs diagnostics for each module based on this first query's results.
This commit is contained in:
bors 2022-02-02 02:29:32 +00:00
commit d5f9c40e6a
5 changed files with 62 additions and 33 deletions

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@ -45,6 +45,7 @@ mod weak_lang_items;
pub fn provide(providers: &mut Providers) {
check_attr::provide(providers);
check_const::provide(providers);
dead::provide(providers);
diagnostic_items::provide(providers);
entry::provide(providers);
lang_items::provide(providers);