Remove the 'cfg' field from session::config::Options.

The 'cfg' in the Options struct is only the commandline-specified
subset of the crate configuration and it's almost always wrong to
read that instead of the CrateConfig in HIR crate node.

Author: michaelwoerister

core.rs

@@ -119,7 +119,6 @@ pub fn run_core(search_paths: SearchPaths,
         lint_cap: Some(lint::Allow),
         externs: externs,
         target_triple: triple.unwrap_or(config::host_triple().to_string()),
-        cfg: config::parse_cfgspecs(cfgs),
         // Ensure that rustdoc works even if rustc is feature-staged
         unstable_features: UnstableFeatures::Allow,
         ..config::basic_options().clone()
@@ -138,7 +137,7 @@ pub fn run_core(search_paths: SearchPaths,
                                        codemap, cstore.clone());
     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
 
-    let mut cfg = config::build_configuration(&sess);
+    let mut cfg = config::build_configuration(&sess, config::parse_cfgspecs(cfgs));
     target_features::add_configuration(&mut cfg, &sess);
 
     let krate = panictry!(driver::phase_1_parse_input(&sess, cfg, &input));

test.rs

@@ -90,8 +90,7 @@ pub fn run(input: &str,
                                        cstore.clone());
     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
 
-    let mut cfg = config::build_configuration(&sess);
-    cfg.extend(config::parse_cfgspecs(cfgs.clone()));
+    let cfg = config::build_configuration(&sess, config::parse_cfgspecs(cfgs.clone()));
     let krate = panictry!(driver::phase_1_parse_input(&sess, cfg, &input));
     let driver::ExpansionResult { defs, mut hir_forest, .. } = {
         phase_2_configure_and_expand(
@@ -247,8 +246,7 @@ fn runtest(test: &str, cratename: &str, cfgs: Vec<String>, libs: SearchPaths,
     let outdir = Mutex::new(TempDir::new("rustdoctest").ok().expect("rustdoc needs a tempdir"));
     let libdir = sess.target_filesearch(PathKind::All).get_lib_path();
     let mut control = driver::CompileController::basic();
-    let mut cfg = config::build_configuration(&sess);
-    cfg.extend(config::parse_cfgspecs(cfgs.clone()));
+    let cfg = config::build_configuration(&sess, config::parse_cfgspecs(cfgs.clone()));
     let out = Some(outdir.lock().unwrap().path().to_path_buf());
 
     if no_run {