rust-analyzer: prep crates for testing against in-tree rustc_private

Author: jieyouxu

src/tools/rust-analyzer/crates/base-db/Cargo.toml

@@ -31,5 +31,9 @@ vfs.workspace = true
 span.workspace = true
 intern.workspace = true
 
+[features]
+default = []
+in-rust-tree = []
+
 [lints]
 workspace = true

src/tools/rust-analyzer/crates/base-db/src/lib.rs

@@ -1,5 +1,10 @@
 //! base_db defines basic database traits. The concrete DB is defined by ide.
 
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
+
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_driver as _;
+
 pub use salsa;
 pub use salsa_macros;
 

src/tools/rust-analyzer/crates/cfg/Cargo.toml

@@ -33,5 +33,9 @@ derive_arbitrary = "1.4.1"
 syntax-bridge.workspace = true
 syntax.workspace = true
 
+[features]
+default = []
+in-rust-tree = []
+
 [lints]
 workspace = true

src/tools/rust-analyzer/crates/cfg/src/lib.rs

@@ -1,5 +1,10 @@
 //! cfg defines conditional compiling options, `cfg` attribute parser and evaluator
 
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
+
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_driver as _;
+
 mod cfg_expr;
 mod dnf;
 #[cfg(test)]

src/tools/rust-analyzer/crates/ide-completion/Cargo.toml

@@ -36,5 +36,9 @@ expect-test = "1.5.1"
 test-utils.workspace = true
 test-fixture.workspace = true
 
+[features]
+default = []
+in-rust-tree = []
+
 [lints]
 workspace = true

src/tools/rust-analyzer/crates/ide-completion/src/lib.rs

@@ -1,5 +1,10 @@
 //! `completions` crate provides utilities for generating completions of user input.
 
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
+
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_driver as _;
+
 mod completions;
 mod config;
 mod context;

src/tools/rust-analyzer/crates/ide-db/Cargo.toml

@@ -52,5 +52,9 @@ expect-test = "1.5.1"
 test-utils.workspace = true
 test-fixture.workspace = true
 
+[features]
+default = []
+in-rust-tree = []
+
 [lints]
 workspace = true

src/tools/rust-analyzer/crates/ide-db/src/lib.rs

@@ -2,6 +2,11 @@
 //!
 //! It is mainly a `HirDatabase` for semantic analysis, plus a `SymbolsDatabase`, for fuzzy search.
 
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
+
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_driver as _;
+
 mod apply_change;
 
 pub mod active_parameter;

src/tools/rust-analyzer/crates/ide-diagnostics/Cargo.toml

@@ -34,5 +34,9 @@ expect-test = "1.5.1"
 test-utils.workspace = true
 test-fixture.workspace = true
 
+[features]
+default = []
+in-rust-tree = []
+
 [lints]
 workspace = true

src/tools/rust-analyzer/crates/ide-diagnostics/src/lib.rs

@@ -23,6 +23,11 @@
 //! There are also a couple of ad-hoc diagnostics implemented directly here, we
 //! don't yet have a great pattern for how to do them properly.
 
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
+
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_driver as _;
+
 mod handlers {
  pub(crate) mod await_outside_of_async;
  pub(crate) mod bad_rtn;