Add support for rule hints

A rule hint is a target attribute, for example:

[rule_hint=cxx] exe{hello}: c{hello}

Rule hints can be used to resolve ambiguity when multiple rules match the same
target as well as to override an unambiguous match.

1 files changed, 5 insertions, 6 deletions

diff --git a/libbuild2/context.cxx b/libbuild2/context.cxx
index a052481..80343bd 100644
--- a/libbuild2/context.cxx
+++ b/libbuild2/context.cxx
@@ -601,14 +601,13 @@ namespace build2
     {
       rule_map& r (gs.rules); // Note: global scope!
 
-      //@@ outer
-      r.insert<alias> (perform_id, 0, "alias", alias_rule::instance);
+      r.insert<alias> (perform_id, 0, "build.alias", alias_rule::instance);
 
-      r.insert<fsdir> (perform_update_id, "fsdir", fsdir_rule::instance);
-      r.insert<fsdir> (perform_clean_id, "fsdir", fsdir_rule::instance);
+      r.insert<fsdir> (perform_update_id, "build.fsdir", fsdir_rule::instance);
+      r.insert<fsdir> (perform_clean_id,  "build.fsdir", fsdir_rule::instance);
 
-      r.insert<mtime_target> (perform_update_id, "file", file_rule::instance);
-      r.insert<mtime_target> (perform_clean_id, "file", file_rule::instance);
+      r.insert<mtime_target> (perform_update_id, "build.file", file_rule::instance);
+      r.insert<mtime_target> (perform_clean_id,  "build.file", file_rule::instance);
     }
   }