Prevent rustdoc feature to be passed down to doctests

Author: GuillaumeGomez

src/librustdoc/config.rs

@@ -344,7 +344,6 @@ impl Options {
                             .map(|s| PathBuf::from(&s))
                             .unwrap_or_else(|| PathBuf::from("doc"));
         let mut cfgs = matches.opt_strs("cfg");
-        cfgs.push("rustdoc".to_string());
         if should_test {
             cfgs.push("doctest".to_string());
         }

src/librustdoc/core.rs

@@ -234,7 +234,7 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
         error_format,
         libs,
         externs,
-        cfgs,
+        mut cfgs,
         codegen_options,
         debugging_options,
         target,
@@ -250,6 +250,9 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
         ..
     } = options;
 
+    // Add the rustdoc cfg into the doc build.
+    cfgs.push("rustdoc".to_string());
+
     let cpath = Some(input.clone());
     let input = Input::File(input);
 

src/librustdoc/test.rs

@@ -62,9 +62,11 @@ pub fn run(options: Options) -> i32 {
         ..config::Options::default()
     };
 
+    let mut cfgs = options.cfgs.clone();
+    cfgs.push("rustdoc".to_owned());
     let config = interface::Config {
         opts: sessopts,
-        crate_cfg: config::parse_cfgspecs(options.cfgs.clone()),
+        crate_cfg: config::parse_cfgspecs(cfgs),
         input,
         input_path: None,
         output_file: None,