From 7a21e9302e194d5ed2a008417130c54cfa52ca24 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 20 Oct 2020 12:34:39 +0200
Subject: Add a hacky remidy for #6038

The proper fix I think is:

* move rust-lang/rust library crates to a separate workspace
* when packaging rust-src component, vendor sources of external deps
---
 crates/base_db/src/input.rs     | 23 +++++++++++++++++++++++
 crates/project_model/src/lib.rs |  5 +++++
 2 files changed, 28 insertions(+)

diff --git a/crates/base_db/src/input.rs b/crates/base_db/src/input.rs
index 215ac4b41..b870e2cee 100644
--- a/crates/base_db/src/input.rs
+++ b/crates/base_db/src/input.rs
@@ -290,6 +290,29 @@ impl CrateGraph {
         }
         false
     }
+
+    // Work around for https://github.com/rust-analyzer/rust-analyzer/issues/6038.
+    // As hacky as it gets.
+    pub fn patch_cfg_if(&mut self) -> bool {
+        let cfg_if = self.hacky_find_crate("cfg_if");
+        let std = self.hacky_find_crate("std");
+        match (cfg_if, std) {
+            (Some(cfg_if), Some(std)) => {
+                self.arena.get_mut(&cfg_if).unwrap().dependencies.clear();
+                self.arena
+                    .get_mut(&std)
+                    .unwrap()
+                    .dependencies
+                    .push(Dependency { crate_id: cfg_if, name: CrateName::new("cfg_if").unwrap() });
+                true
+            }
+            _ => false,
+        }
+    }
+
+    fn hacky_find_crate(&self, declaration_name: &str) -> Option<CrateId> {
+        self.iter().find(|it| self[*it].declaration_name.as_deref() == Some(declaration_name))
+    }
 }
 
 impl ops::Index<CrateId> for CrateGraph {
diff --git a/crates/project_model/src/lib.rs b/crates/project_model/src/lib.rs
index d1e7602fc..ea95d1c77 100644
--- a/crates/project_model/src/lib.rs
+++ b/crates/project_model/src/lib.rs
@@ -485,6 +485,11 @@ impl ProjectWorkspace {
                 }
             }
         }
+        if crate_graph.patch_cfg_if() {
+            log::debug!("Patched std to depend on cfg-if")
+        } else {
+            log::debug!("Did not patch std to depend on cfg-if")
+        }
         crate_graph
     }
 }
-- 
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