Remove Linkage::Private

This is the same as Linkage::Internal except that it doesn't emit any
symbol. Some backends may not support it and it isn't all that useful
anyway.

compiler/rustc_codegen_gcc/src/base.rs

@@ -51,7 +51,6 @@ pub fn global_linkage_to_gcc(linkage: Linkage) -> GlobalKind {
         Linkage::WeakODR => unimplemented!(),
         Linkage::Appending => unimplemented!(),
         Linkage::Internal => GlobalKind::Internal,
-        Linkage::Private => GlobalKind::Internal,
         Linkage::ExternalWeak => GlobalKind::Imported, // TODO(antoyo): should be weak linkage.
         Linkage::Common => unimplemented!(),
     }
@@ -68,7 +67,6 @@ pub fn linkage_to_gcc(linkage: Linkage) -> FunctionType {
         Linkage::WeakODR => unimplemented!(),
         Linkage::Appending => unimplemented!(),
         Linkage::Internal => FunctionType::Internal,
-        Linkage::Private => FunctionType::Internal,
         Linkage::ExternalWeak => unimplemented!(),
         Linkage::Common => unimplemented!(),
     }

compiler/rustc_codegen_gcc/src/mono_item.rs

@@ -61,10 +61,7 @@ impl<'gcc, 'tcx> PreDefineCodegenMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         // compiler-rt, then we want to implicitly compile everything with hidden
         // visibility as we're going to link this object all over the place but
         // don't want the symbols to get exported.
-        if linkage != Linkage::Internal
+        if linkage != Linkage::Internal && self.tcx.is_compiler_builtins(LOCAL_CRATE) {
-            && linkage != Linkage::Private
-            && self.tcx.is_compiler_builtins(LOCAL_CRATE)
-        {
             #[cfg(feature = "master")]
             decl.add_attribute(FnAttribute::Visibility(gccjit::Visibility::Hidden));
         } else {

compiler/rustc_codegen_llvm/src/base.rs

@@ -159,7 +159,6 @@ pub(crate) fn linkage_to_llvm(linkage: Linkage) -> llvm::Linkage {
         Linkage::WeakODR => llvm::Linkage::WeakODRLinkage,
         Linkage::Appending => llvm::Linkage::AppendingLinkage,
         Linkage::Internal => llvm::Linkage::InternalLinkage,
-        Linkage::Private => llvm::Linkage::PrivateLinkage,
         Linkage::ExternalWeak => llvm::Linkage::ExternalWeakLinkage,
         Linkage::Common => llvm::Linkage::CommonLinkage,
     }

compiler/rustc_codegen_llvm/src/mono_item.rs

@@ -71,10 +71,7 @@ impl<'tcx> PreDefineCodegenMethods<'tcx> for CodegenCx<'_, 'tcx> {
         // compiler-rt, then we want to implicitly compile everything with hidden
         // visibility as we're going to link this object all over the place but
         // don't want the symbols to get exported.
-        if linkage != Linkage::Internal
+        if linkage != Linkage::Internal && self.tcx.is_compiler_builtins(LOCAL_CRATE) {
-            && linkage != Linkage::Private
-            && self.tcx.is_compiler_builtins(LOCAL_CRATE)
-        {
             llvm::set_visibility(lldecl, llvm::Visibility::Hidden);
         } else {
             llvm::set_visibility(lldecl, base::visibility_to_llvm(visibility));

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -49,7 +49,6 @@ fn linkage_by_name(tcx: TyCtxt<'_>, def_id: LocalDefId, name: &str) -> Linkage {
         "internal" => Internal,
         "linkonce" => LinkOnceAny,
         "linkonce_odr" => LinkOnceODR,
-        "private" => Private,
         "weak" => WeakAny,
         "weak_odr" => WeakODR,
         _ => tcx.dcx().span_fatal(tcx.def_span(def_id), "invalid linkage specified"),

compiler/rustc_codegen_ssa/src/mir/naked_asm.rs

@@ -187,7 +187,7 @@ fn prefix_and_suffix<'tcx>(
                     }
                 }
             }
-            Linkage::Internal | Linkage::Private => {
+            Linkage::Internal => {
                 // write nothing
             }
             Linkage::Appending => emit_fatal("Only global variables can have appending linkage!"),

compiler/rustc_middle/src/middle/codegen_fn_attrs.rs

@@ -178,7 +178,7 @@ impl CodegenFnAttrs {
             || match self.linkage {
                 // These are private, so make sure we don't try to consider
                 // them external.
-                None | Some(Linkage::Internal | Linkage::Private) => false,
+                None | Some(Linkage::Internal) => false,
                 Some(_) => true,
             }
     }

compiler/rustc_middle/src/mir/mono.rs

@@ -329,7 +329,6 @@ pub enum Linkage {
     WeakODR,
     Appending,
     Internal,
-    Private,
     ExternalWeak,
     Common,
 }

compiler/rustc_monomorphize/src/partitioning.rs

@@ -1240,7 +1240,6 @@ fn collect_and_partition_mono_items(tcx: TyCtxt<'_>, (): ()) -> MonoItemPartitio
                         Linkage::WeakODR => "WeakODR",
                         Linkage::Appending => "Appending",
                         Linkage::Internal => "Internal",
-                        Linkage::Private => "Private",
                         Linkage::ExternalWeak => "ExternalWeak",
                         Linkage::Common => "Common",
                     };

tests/ui/linkage-attr/linkage-attr-does-not-panic-llvm-issue-33992.rs

@@ -18,9 +18,6 @@ pub static TEST4: bool = true;
 #[linkage = "linkonce_odr"]
 pub static TEST5: bool = true;
 
-#[linkage = "private"]
-pub static TEST6: bool = true;
-
 #[linkage = "weak"]
 pub static TEST7: bool = true;