Add feature gate for raw_dylib.

Author: crlf0710

src/librustc/middle/cstore.rs

@@ -96,6 +96,8 @@ pub enum NativeLibraryKind {
     NativeStaticNobundle,
     /// macOS-specific
     NativeFramework,
+    /// windows dynamic library without import library
+    NativeRawDylib,
     /// default way to specify a dynamic library
     NativeUnknown,
 }

src/librustc_codegen_ssa/back/link.rs

@@ -323,6 +323,7 @@ fn link_rlib<'a, B: ArchiveBuilder<'a>>(sess: &'a Session,
             NativeLibraryKind::NativeStatic => {}
             NativeLibraryKind::NativeStaticNobundle |
             NativeLibraryKind::NativeFramework |
+            NativeLibraryKind::NativeRawDylib |
             NativeLibraryKind::NativeUnknown => continue,
         }
         if let Some(name) = lib.name {
@@ -883,7 +884,8 @@ pub fn print_native_static_libs(sess: &Session, all_native_libs: &[NativeLibrary
                     Some(format!("-framework {}", name))
                 },
                 // These are included, no need to print them
-                NativeLibraryKind::NativeStatic => None,
+                NativeLibraryKind::NativeStatic |
+                NativeLibraryKind::NativeRawDylib => None,
             }
         })
         .collect();
@@ -1293,7 +1295,11 @@ pub fn add_local_native_libraries(cmd: &mut dyn Linker,
             NativeLibraryKind::NativeUnknown => cmd.link_dylib(name),
             NativeLibraryKind::NativeFramework => cmd.link_framework(name),
             NativeLibraryKind::NativeStaticNobundle => cmd.link_staticlib(name),
-            NativeLibraryKind::NativeStatic => cmd.link_whole_staticlib(name, &search_path)
+            NativeLibraryKind::NativeStatic => cmd.link_whole_staticlib(name, &search_path),
+            NativeLibraryKind::NativeRawDylib => {
+                // FIXME(#58713): Proper handling for raw dylibs.
+                bug!("raw_dylib feature not yet implemented");
+            },
         }
     }
 }
@@ -1678,7 +1684,11 @@ pub fn add_upstream_native_libraries(
                 // ignore statically included native libraries here as we've
                 // already included them when we included the rust library
                 // previously
-                NativeLibraryKind::NativeStatic => {}
+                NativeLibraryKind::NativeStatic => {},
+                NativeLibraryKind::NativeRawDylib => {
+                    // FIXME(#58713): Proper handling for raw dylibs.
+                    bug!("raw_dylib feature not yet implemented");
+                },
             }
         }
     }

src/librustc_metadata/cstore_impl.rs

@@ -270,7 +270,11 @@ pub fn provide(providers: &mut Providers<'_>) {
     // resolve! Does this work? Unsure! That's what the issue is about
     *providers = Providers {
         is_dllimport_foreign_item: |tcx, id| {
-            tcx.native_library_kind(id) == Some(NativeLibraryKind::NativeUnknown)
+            match tcx.native_library_kind(id) {
+                Some(NativeLibraryKind::NativeUnknown) |
+                Some(NativeLibraryKind::NativeRawDylib) => true,
+                _ => false,
+            }
         },
         is_statically_included_foreign_item: |tcx, id| {
             match tcx.native_library_kind(id) {

src/librustc_metadata/native_libs.rs

@@ -73,6 +73,7 @@ impl ItemLikeVisitor<'tcx> for Collector<'tcx> {
                         "static-nobundle" => cstore::NativeStaticNobundle,
                         "dylib" => cstore::NativeUnknown,
                         "framework" => cstore::NativeFramework,
+                        "raw-dylib" => cstore::NativeRawDylib,
                         k => {
                             struct_span_err!(self.tcx.sess, item.span(), E0458,
                                       "unknown kind: `{}`", k)
@@ -169,6 +170,14 @@ impl Collector<'tcx> {
                                            GateIssue::Language,
                                            "kind=\"static-nobundle\" is unstable");
         }
+        if lib.kind == cstore::NativeRawDylib &&
+           !self.tcx.features().raw_dylib {
+            feature_gate::emit_feature_err(&self.tcx.sess.parse_sess,
+                                           sym::raw_dylib,
+                                           span.unwrap_or_else(|| syntax_pos::DUMMY_SP),
+                                           GateIssue::Language,
+                                           "kind=\"raw-dylib\" is feature gated");
+        }
         self.libs.push(lib);
     }
 

src/libsyntax/feature_gate/active.rs

@@ -522,6 +522,9 @@ declare_features! (
     /// Allows the definition of `const extern fn` and `const unsafe extern fn`.
     (active, const_extern_fn, "1.40.0", Some(64926), None),
 
+    // Allows the use of raw-dylibs (RFC 2627).
+    (active, raw_dylib, "1.39.0", Some(58713), None),
+
     // -------------------------------------------------------------------------
     // feature-group-end: actual feature gates
     // -------------------------------------------------------------------------

src/libsyntax/feature_gate/builtin_attrs.rs

@@ -276,7 +276,13 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         "the `link_args` attribute is experimental and not portable across platforms, \
         it is recommended to use `#[link(name = \"foo\")] instead",
     ),
-
+    gated!(
+        link_ordinal,
+        Whitelisted,
+        template!(List: "ordinal"),
+        raw_dylib,
+        experimental!(link_ordinal)
+    ),
     // Plugins:
     (
         sym::plugin_registrar, Normal, template!(Word),

src/libsyntax_pos/symbol.rs

@@ -389,6 +389,7 @@ symbols! {
         link_cfg,
         link_llvm_intrinsics,
         link_name,
+        link_ordinal,
         link_section,
         LintPass,
         lint_reasons,
@@ -531,6 +532,7 @@ symbols! {
         RangeInclusive,
         RangeTo,
         RangeToInclusive,
+        raw_dylib,
         raw_identifiers,
         Ready,
         reason,

src/test/ui/feature-gates/feature-gate-raw-dylib-2.rs

@@ -0,0 +1,8 @@
+#[link(name="foo")]
+extern {
+#[link_ordinal(42)]
+//~^ ERROR: the `#[link_ordinal]` attribute is an experimental feature
+fn foo();
+}
+
+fn main() {}

src/test/ui/feature-gates/feature-gate-raw-dylib-2.stderr

@@ -0,0 +1,12 @@
+error[E0658]: the `#[link_ordinal]` attribute is an experimental feature
+  --> $DIR/feature-gate-raw-dylib-2.rs:3:1
+   |
+LL | #[link_ordinal(42)]
+   | ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: for more information, see https://github.com/rust-lang/rust/issues/58713
+   = help: add `#![feature(raw_dylib)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.

src/test/ui/feature-gates/feature-gate-raw-dylib.rs

@@ -0,0 +1,5 @@
+#[link(name="foo", kind="raw-dylib")]
+//~^ ERROR: kind="raw-dylib" is feature gated
+extern {}
+
+fn main() {}