Add unstable option to only emit shared/crate-specific files

The intended use case is for docs.rs, which can now copy exactly the
files it cares about, rather than having to guess based on whether they
have a resource suffix or not. In particular, some files have a resource
suffix but cannot be shared between crates: https://github.com/rust-lang/docs.rs/pull/1312#issuecomment-798783688

The end goal is to fix https://github.com/rust-lang/docs.rs/issues/1327
by reverting https://github.com/rust-lang/docs.rs/pull/1324.

This obsoletes `--print=unversioned-files`, which I plan to remove as
soon as docs.rs stops using it.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/librustdoc/formats/renderer.rs b/src/librustdoc/formats/renderer.rs
index 9dcef3a20d6..f0b390add73 100644
--- a/src/librustdoc/formats/renderer.rs
+++ b/src/librustdoc/formats/renderer.rs
@@ -58,10 +58,15 @@ crate fn run_format<'tcx, T: FormatRenderer<'tcx>>(
 ) -> Result<(), Error> {
     let prof = &tcx.sess.prof;
 
+    let emit_crate = options.should_emit_crate();
     let (mut format_renderer, krate) = prof
         .extra_verbose_generic_activity("create_renderer", T::descr())
         .run(|| T::init(krate, options, edition, cache, tcx))?;
 
+    if !emit_crate {
+        return Ok(());
+    }
+
     // Render the crate documentation
     let crate_name = krate.name;
     let mut work = vec![(format_renderer.make_child_renderer(), krate.module)];