handle cfg bootstrap on compiler and miri

Signed-off-by: onur-ozkan <work@onurozkan.dev>

compiler/rustc_data_structures/src/flock.rs

@@ -4,7 +4,18 @@
 //! green/native threading. This is just a bare-bones enough solution for
 //! librustdoc, it is not production quality at all.
 
-cfg_select! {
+// cfg(bootstrap)
+macro_rules! cfg_select_dispatch {
+    ($($tokens:tt)*) => {
+        #[cfg(bootstrap)]
+        cfg_match! { $($tokens)* }
+
+        #[cfg(not(bootstrap))]
+        cfg_select! { $($tokens)* }
+    };
+}
+
+cfg_select_dispatch! {
     target_os = "linux" => {
         mod linux;
         use linux as imp;

compiler/rustc_data_structures/src/lib.rs

@@ -10,6 +10,8 @@
 #![allow(internal_features)]
 #![allow(rustc::default_hash_types)]
 #![allow(rustc::potential_query_instability)]
+#![cfg_attr(bootstrap, feature(cfg_match))]
+#![cfg_attr(not(bootstrap), feature(cfg_select))]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
@@ -19,7 +21,6 @@
 #![feature(ascii_char_variants)]
 #![feature(assert_matches)]
 #![feature(auto_traits)]
-#![feature(cfg_select)]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
 #![feature(extend_one)]

compiler/rustc_data_structures/src/profiling.rs

@@ -859,8 +859,19 @@ fn get_thread_id() -> u32 {
     std::thread::current().id().as_u64().get() as u32
 }
 
+// cfg(bootstrap)
+macro_rules! cfg_select_dispatch {
+    ($($tokens:tt)*) => {
+        #[cfg(bootstrap)]
+        cfg_match! { $($tokens)* }
+
+        #[cfg(not(bootstrap))]
+        cfg_select! { $($tokens)* }
+    };
+}
+
 // Memory reporting
-cfg_select! {
+cfg_select_dispatch! {
     windows => {
         pub fn get_resident_set_size() -> Option<usize> {
             use windows::{