diff options
Diffstat (limited to 'build/rule')
| -rw-r--r-- | build/rule | 17 |
1 files changed, 16 insertions, 1 deletions
@@ -34,8 +34,9 @@ namespace build target_type* target; - match_result (target_type& t, bool v): value (v), target (&t) {} + action recipe_action = action (); // Used as recipe's action if set. + match_result (target_type& t, bool v): value (v), target (&t) {} match_result (std::nullptr_t v = nullptr): prerequisite (v), target (v) {} match_result (prerequisite_type& p): prerequisite (&p), target (nullptr) {} match_result (prerequisite_type* p): prerequisite (p), target (nullptr) {} @@ -76,6 +77,20 @@ namespace build static target_state perform_update (action, target&); + // Sometimes it is useful, normally as an optimization, to check + // if the file target is up to date. In particular, if the rule + // that matched a target is this fallback rule and the target + // has no prerequisites, then it means it is up to date. + // + static bool + uptodate (action a, target& t) + { + recipe_function* const* r (t.recipe (a).target<recipe_function*> ()); + return r != nullptr && *r == &perform_update && + t.prerequisites.empty () && + (t.group == nullptr || t.group->prerequisites.empty ()); + } + static file_rule instance; }; |