add target features when extracting and running doctests

src/librustdoc/test.rs

@@ -28,7 +28,7 @@ use rustc::session::config::{OutputType, OutputTypes, Externs};
 use rustc::session::search_paths::{SearchPaths, PathKind};
 use rustc_metadata::dynamic_lib::DynamicLibrary;
 use tempdir::TempDir;
-use rustc_driver::{self, driver, Compilation};
+use rustc_driver::{self, driver, target_features, Compilation};
 use rustc_driver::driver::phase_2_configure_and_expand;
 use rustc_metadata::cstore::CStore;
 use rustc_resolve::MakeGlobMap;
@@ -96,8 +96,10 @@ pub fn run(input_path: &Path,
     let trans = rustc_driver::get_trans(&sess);
     let cstore = CStore::new(trans.metadata_loader());
     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
-    sess.parse_sess.config =
-        config::build_configuration(&sess, config::parse_cfgspecs(cfgs.clone()));
+
+    let mut cfg = config::build_configuration(&sess, config::parse_cfgspecs(cfgs.clone()));
+    target_features::add_configuration(&mut cfg, &sess, &*trans);
+    sess.parse_sess.config = cfg;
 
     let krate = panictry!(driver::phase_1_parse_input(&driver::CompileController::basic(),
                                                       &sess,
@@ -271,8 +273,11 @@ fn run_test(test: &str, cratename: &str, filename: &FileName, line: usize,
     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();
-    sess.parse_sess.config =
-        config::build_configuration(&sess, config::parse_cfgspecs(cfgs.clone()));
+
+    let mut cfg = config::build_configuration(&sess, config::parse_cfgspecs(cfgs.clone()));
+    target_features::add_configuration(&mut cfg, &sess, &*trans);
+    sess.parse_sess.config = cfg;
+
     let out = Some(outdir.lock().unwrap().path().to_path_buf());
 
     if no_run {

src/test/rustdoc/doc-cfg-target-feature.rs

@@ -0,0 +1,31 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// only-x86_64
+// compile-flags:--test
+// should-fail
+// no-system-llvm
+
+// #49723: rustdoc didn't add target features when extracting or running doctests
+
+#![feature(doc_cfg)]
+
+/// Foo
+///
+/// # Examples
+///
+/// ```
+/// #![feature(cfg_target_feature)]
+///
+/// #[cfg(target_feature = "sse")]
+/// assert!(false);
+/// ```
+#[doc(cfg(target_feature = "sse"))]
+pub unsafe fn foo() {}