rollup merge of #18890: luqmana/tf

This is especially useful for declaring a static with external linkage in an executable. There isn't any way to do that currently since we mark everything in an executable as internal by default.

Also, a quick fix to have the no-compiler-rt target option respected when building staticlibs as well.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 0178566fb06..0c31e9ae01d 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -182,6 +182,10 @@ impl<'a, 'v> Visitor<'v> for Context<'a> {
                                   "`#[thread_local]` is an experimental feature, and does not \
                                   currently handle destructors. There is no corresponding \
                                   `#[task_local]` mapping to the task model");
+            } else if attr.name().equiv(&("linkage")) {
+                self.gate_feature("linkage", i.span,
+                                  "the `linkage` attribute is experimental \
+                                   and not portable across platforms")
             }
         }
         match i.node {