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-rw-r--r--compiler/rustc_session/src/config.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index ba7ccd6a02d..7586c5766b5 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -539,7 +539,10 @@ impl FromStr for SplitDwarfKind {
 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, PartialOrd, Ord, HashStable_Generic)]
 #[derive(Encodable, Decodable)]
 pub enum OutputType {
+    /// This is the optimized bitcode, which could be either pre-LTO or non-LTO bitcode,
+    /// depending on the specific request type.
     Bitcode,
+    /// This is the summary or index data part of the ThinLTO bitcode.
     ThinLinkBitcode,
     Assembly,
     LlvmAssembly,