rustc: Actually hook the crate_type attribute into session

Author: brson

src/comp/driver/rustc.rs

@@ -138,6 +138,8 @@ fn compile_input(sess: session::session, cfg: ast::crate_cfg, input: str,
         time(time_passes, "parsing", bind parse_input(sess, cfg, input));
     if sess.get_opts().parse_only { ret; }
 
+    sess.set_building_library(crate);
+
     crate =
         time(time_passes, "configuration",
              bind front::config::strip_unconfigured_items(crate));
@@ -492,7 +494,7 @@ fn build_session(sopts: @session::options) -> session::session {
         sopts.addl_lib_search_paths);
     ret session::session(target_cfg, sopts, cstore,
                          @{cm: codemap::new_codemap(), mutable next_id: 0},
-                         none, 0u, filesearch);
+                         none, 0u, filesearch, false);
 }
 
 fn parse_pretty(sess: session::session, &&name: str) -> pp_mode {

src/comp/driver/session.rs

@@ -59,7 +59,8 @@ obj session(targ_cfg: @config,
             // For a library crate, this is always none
             mutable main_fn: option::t<node_id>,
             mutable err_count: uint,
-            filesearch: filesearch::filesearch) {
+            filesearch: filesearch::filesearch,
+            mutable building_library: bool) {
     fn get_targ_cfg() -> @config { ret targ_cfg; }
     fn get_opts() -> @options { ret opts; }
     fn get_cstore() -> metadata::cstore::cstore { cstore }
@@ -118,7 +119,10 @@ obj session(targ_cfg: @config,
     fn set_main_id(d: node_id) { main_fn = some(d); }
     fn get_main_id() -> option::t<node_id> { main_fn }
     fn filesearch() -> filesearch::filesearch { filesearch }
-    fn building_library() -> bool { opts.crate_type == lib_crate }
+    fn building_library() -> bool { building_library }
+    fn set_building_library(crate: @ast::crate) {
+        building_library = session::building_library(opts.crate_type, crate);
+    }
 }
 
 fn building_library(req_crate_type: crate_type, crate: @ast::crate) -> bool {