tmp: stabilize gnu-lld-cc and gnu-cc linker flavors

Author: lqd

compiler/rustc_target/src/spec/mod.rs

@@ -166,7 +166,7 @@ pub enum LinkerFlavor {
 /// well as modern ones matching the internal linker flavors (`LinkerFlavor`).
 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
 pub enum LinkerFlavorCli {
-    // Modern (unstable) flavors, with direct counterparts in `LinkerFlavor`.
+    // Modern (mostly unstable) flavors, with direct counterparts in `LinkerFlavor`.
     Gnu(Cc, Lld),
     Darwin(Cc, Lld),
     WasmLld(Cc),
@@ -192,7 +192,8 @@ impl LinkerFlavorCli {
     /// Returns whether this `-C linker-flavor` option is one of the unstable values.
     pub fn is_unstable(&self) -> bool {
         match self {
-            LinkerFlavorCli::Gnu(..)
+            LinkerFlavorCli::Gnu(Cc::Yes, _) => false,
+            LinkerFlavorCli::Gnu(Cc::No, _)
             | LinkerFlavorCli::Darwin(..)
             | LinkerFlavorCli::WasmLld(..)
             | LinkerFlavorCli::Unix(..)