minimize the rust-std component

This splits out a rustc-dev component with the compiler crates, and
keeps the status quo of default installed files on nightly. The default
changing to not install compiler libraries by default is left for a
future pull request.

However, on stable and beta, this does remove the compiler libraries
from the set of libraries installed by default, as they are never needed
there (per our stability story, they "cannot" be used).

1 files changed, 15 insertions, 0 deletions

diff --git a/src/tools/build-manifest/src/main.rs b/src/tools/build-manifest/src/main.rs
index f41e7dd17ed..97e758f9b82 100644
--- a/src/tools/build-manifest/src/main.rs
+++ b/src/tools/build-manifest/src/main.rs
@@ -399,6 +399,7 @@ impl Builder {
     fn add_packages_to(&mut self, manifest: &mut Manifest) {
         let mut package = |name, targets| self.package(name, &mut manifest.pkg, targets);
         package("rustc", HOSTS);
+        package("rustc-dev", HOSTS);
         package("cargo", HOSTS);
         package("rust-mingw", MINGW);
         package("rust-std", TARGETS);
@@ -481,6 +482,15 @@ impl Builder {
             components.push(host_component("rust-mingw"));
         }
 
+        // The compiler libraries are not stable for end users, but `rustc-dev` was only recently
+        // split out of `rust-std`. We'll include it by default as a transition for nightly users,
+        // but ship it as an optional component on the beta and stable channels.
+        if self.rust_release == "nightly" {
+            components.push(host_component("rustc-dev"));
+        } else {
+            extensions.push(host_component("rustc-dev"));
+        }
+
         // Tools are always present in the manifest,
         // but might be marked as unavailable if they weren't built.
         extensions.extend(vec![
@@ -498,6 +508,11 @@ impl Builder {
                 .filter(|&&target| target != host)
                 .map(|target| Component::from_str("rust-std", target))
         );
+        extensions.extend(
+            HOSTS.iter()
+                .filter(|&&target| target != host)
+                .map(|target| Component::from_str("rustc-dev", target))
+        );
         extensions.push(Component::from_str("rust-src", "*"));
 
         // If the components/extensions don't actually exist for this