rustbuild: generate full list of dependencies for metadata

Previously, we didn't send --features to our cargo metadata invocations,
and thus missed some dependencies that we enable through the --features
mechanism.

src/bootstrap/lib.rs

@@ -280,7 +280,8 @@ pub struct Build {
 struct Crate {
     name: Interned<String>,
     version: String,
-    deps: Vec<Interned<String>>,
+    deps: HashSet<Interned<String>>,
+    id: String,
     path: PathBuf,
     doc_step: String,
     build_step: String,

src/bootstrap/metadata.rs

@@ -11,6 +11,7 @@
 use std::collections::HashMap;
 use std::process::Command;
 use std::path::PathBuf;
+use std::collections::HashSet;
 
 use build_helper::output;
 use serde_json;
@@ -45,12 +46,34 @@ struct ResolveNode {
 }
 
 pub fn build(build: &mut Build) {
-    build_krate(build, "src/libstd");
-    build_krate(build, "src/libtest");
-    build_krate(build, "src/rustc");
+    let mut resolves = Vec::new();
+    build_krate(&build.std_features(), build, &mut resolves, "src/libstd");
+    build_krate("", build, &mut resolves, "src/libtest");
+    build_krate(&build.rustc_features(), build, &mut resolves, "src/rustc");
+
+    let mut id2name = HashMap::new();
+    for (name, krate) in build.crates.iter() {
+        id2name.insert(krate.id.clone(), name.clone());
+    }
+
+    for node in resolves {
+        let name = match id2name.get(&node.id) {
+            Some(name) => name,
+            None => continue,
+        };
+
+        let krate = build.crates.get_mut(name).unwrap();
+        for dep in node.dependencies.iter() {
+            let dep = match id2name.get(dep) {
+                Some(dep) => dep,
+                None => continue,
+            };
+            krate.deps.insert(*dep);
+        }
+    }
 }
 
-fn build_krate(build: &mut Build, krate: &str) {
+fn build_krate(features: &str, build: &mut Build, resolves: &mut Vec<ResolveNode>, krate: &str) {
     // Run `cargo metadata` to figure out what crates we're testing.
     //
     // Down below we're going to call `cargo test`, but to test the right set
@@ -60,14 +83,13 @@ fn build_krate(build: &mut Build, krate: &str) {
     let mut cargo = Command::new(&build.initial_cargo);
     cargo.arg("metadata")
          .arg("--format-version").arg("1")
+         .arg("--features").arg(features)
          .arg("--manifest-path").arg(build.src.join(krate).join("Cargo.toml"));
     let output = output(&mut cargo);
     let output: Output = serde_json::from_str(&output).unwrap();
-    let mut id2name = HashMap::new();
     for package in output.packages {
         if package.source.is_none() {
             let name = INTERNER.intern_string(package.name);
-            id2name.insert(package.id, name);
             let mut path = PathBuf::from(package.manifest_path);
             path.pop();
             build.crates.insert(name, Crate {
@@ -77,25 +99,11 @@ fn build_krate(build: &mut Build, krate: &str) {
                 bench_step: format!("bench-crate-{}", name),
                 name,
                 version: package.version,
-                deps: Vec::new(),
+                id: package.id,
+                deps: HashSet::new(),
                 path,
             });
         }
     }
-
-    for node in output.resolve.nodes {
-        let name = match id2name.get(&node.id) {
-            Some(name) => name,
-            None => continue,
-        };
-
-        let krate = build.crates.get_mut(name).unwrap();
-        for dep in node.dependencies.iter() {
-            let dep = match id2name.get(dep) {
-                Some(dep) => dep,
-                None => continue,
-            };
-            krate.deps.push(*dep);
-        }
-    }
+    resolves.extend(output.resolve.nodes);
 }