Merge #1928

1928: Support `#[cfg(..)]` r=matklad a=oxalica

This PR implement `#[cfg(..)]` conditional compilation. It read default cfg options from `rustc --print cfg` with also hard-coded `test` and `debug_assertion` enabled.
Front-end settings are **not** included in this PR.

There is also a known issue that inner control attributes are totally ignored. I think it is **not** a part of `cfg` and create a separated issue for it. #1949

Fixes #1920 

Related: #1073 


Co-authored-by: uHOOCCOOHu <[email protected]>
Co-authored-by: oxalica <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/crates/ra_project_model/src/json_project.rs b/crates/ra_project_model/src/json_project.rs
index 54ddca2cb..1bacb1d09 100644
--- a/crates/ra_project_model/src/json_project.rs
+++ b/crates/ra_project_model/src/json_project.rs
@@ -2,6 +2,7 @@
 
 use std::path::PathBuf;
 
+use rustc_hash::{FxHashMap, FxHashSet};
 use serde::Deserialize;
 
 /// A root points to the directory which contains Rust crates. rust-analyzer watches all files in
@@ -19,6 +20,8 @@ pub struct Crate {
     pub(crate) root_module: PathBuf,
     pub(crate) edition: Edition,
     pub(crate) deps: Vec<Dep>,
+    pub(crate) atom_cfgs: FxHashSet<String>,
+    pub(crate) key_value_cfgs: FxHashMap<String, String>,
 }
 
 #[derive(Clone, Copy, Debug, Deserialize)]