Merge #2381

2381: Add proc-macro crate type handling r=JasperDeSutter a=JasperDeSutter

Resolves the libproc_macro crate in crates that are the proc-macro type.
This doesn't seem the ideal implementation though, since the compiler still requires you to write `extern crate proc_macro;` (even in 2018 edition).

Co-authored-by: JasperDeSutter <[email protected]>

1 files changed, 17 insertions, 0 deletions

diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index 638ca2f8b..55ff4d6ef 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -211,6 +211,8 @@ impl ProjectWorkspace {
                 let libcore = sysroot.core().and_then(|it| sysroot_crates.get(&it).copied());
                 let liballoc = sysroot.alloc().and_then(|it| sysroot_crates.get(&it).copied());
                 let libstd = sysroot.std().and_then(|it| sysroot_crates.get(&it).copied());
+                let libproc_macro =
+                    sysroot.proc_macro().and_then(|it| sysroot_crates.get(&it).copied());
 
                 let mut pkg_to_lib_crate = FxHashMap::default();
                 let mut pkg_crates = FxHashMap::default();
@@ -237,6 +239,21 @@ impl ProjectWorkspace {
                                 lib_tgt = Some(crate_id);
                                 pkg_to_lib_crate.insert(pkg, crate_id);
                             }
+                            if tgt.is_proc_macro(&cargo) {
+                                if let Some(proc_macro) = libproc_macro {
+                                    if let Err(_) = crate_graph.add_dep(
+                                        crate_id,
+                                        "proc_macro".into(),
+                                        proc_macro,
+                                    ) {
+                                        log::error!(
+                                            "cyclic dependency on proc_macro for {}",
+                                            pkg.name(&cargo)
+                                        )
+                                    }
+                                }
+                            }
+
                             pkg_crates.entry(pkg).or_insert_with(Vec::new).push(crate_id);
                         }
                     }