From a57a99041616612c8cd7e0cdfe4eb117f9960644 Mon Sep 17 00:00:00 2001
From: onur-ozkan <work@onurozkan.dev>
Date: Wed, 10 Apr 2024 08:53:07 +0300
Subject: [PATCH 1/2] drop `changelog-seen`

It's been 7 months since we deprecated this. It should be fine to remove it now.

Signed-off-by: onur-ozkan <work@onurozkan.dev>
---
 src/bootstrap/src/bin/main.rs           |  4 ----
 src/bootstrap/src/core/config/config.rs | 16 +---------------
 2 files changed, 1 insertion(+), 19 deletions(-)

diff --git a/src/bootstrap/src/bin/main.rs b/src/bootstrap/src/bin/main.rs
index 340a5c87f0bc4..4cb67b7aa6245 100644
--- a/src/bootstrap/src/bin/main.rs
+++ b/src/bootstrap/src/bin/main.rs
@@ -131,10 +131,6 @@ fn main() {
 fn check_version(config: &Config) -> Option<String> {
     let mut msg = String::new();
 
-    if config.changelog_seen.is_some() {
-        msg.push_str("WARNING: The use of `changelog-seen` is deprecated. Please refer to `change-id` option in `config.example.toml` instead.\n");
-    }
-
     let latest_change_id = CONFIG_CHANGE_HISTORY.last().unwrap().change_id;
     let warned_id_path = config.out.join("bootstrap").join(".last-warned-change-id");
 
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index 96dec97525048..334cff2fdc580 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -145,7 +145,6 @@ impl LldMode {
 /// `config.example.toml`.
 #[derive(Default, Clone)]
 pub struct Config {
-    pub changelog_seen: Option<usize>, // FIXME: Deprecated field. Remove it at 2024.
     pub change_id: Option<usize>,
     pub bypass_bootstrap_lock: bool,
     pub ccache: Option<String>,
@@ -605,7 +604,6 @@ impl Target {
 #[derive(Deserialize, Default)]
 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 pub(crate) struct TomlConfig {
-    changelog_seen: Option<usize>, // FIXME: Deprecated field. Remove it at 2024.
     #[serde(flatten)]
     change_id: ChangeIdWrapper,
     build: Option<Build>,
@@ -645,17 +643,7 @@ trait Merge {
 impl Merge for TomlConfig {
     fn merge(
         &mut self,
-        TomlConfig {
-            build,
-            install,
-            llvm,
-            rust,
-            dist,
-            target,
-            profile: _,
-            changelog_seen,
-            change_id,
-        }: Self,
+        TomlConfig { build, install, llvm, rust, dist, target, profile: _, change_id }: Self,
         replace: ReplaceOpt,
     ) {
         fn do_merge<T: Merge>(x: &mut Option<T>, y: Option<T>, replace: ReplaceOpt) {
@@ -667,7 +655,6 @@ impl Merge for TomlConfig {
                 }
             }
         }
-        self.changelog_seen.merge(changelog_seen, replace);
         self.change_id.inner.merge(change_id.inner, replace);
         do_merge(&mut self.build, build, replace);
         do_merge(&mut self.install, install, replace);
@@ -1400,7 +1387,6 @@ impl Config {
         }
         toml.merge(override_toml, ReplaceOpt::Override);
 
-        config.changelog_seen = toml.changelog_seen;
         config.change_id = toml.change_id.inner;
 
         let Build {

From cce21be686b5ad46705b0fa6472fcef90d87668f Mon Sep 17 00:00:00 2001
From: onur-ozkan <work@onurozkan.dev>
Date: Wed, 10 Apr 2024 14:10:35 +0300
Subject: [PATCH 2/2] add change entry for the removal of `changelog-seen`

Signed-off-by: onur-ozkan <work@onurozkan.dev>
---
 src/bootstrap/src/utils/change_tracker.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/bootstrap/src/utils/change_tracker.rs b/src/bootstrap/src/utils/change_tracker.rs
index 277ec00fa623b..db3df598a0c63 100644
--- a/src/bootstrap/src/utils/change_tracker.rs
+++ b/src/bootstrap/src/utils/change_tracker.rs
@@ -170,4 +170,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Warning,
         summary: "`rust.split-debuginfo` has been moved to `target.<triple>.split-debuginfo` and its default value is determined for each target individually.",
     },
+    ChangeInfo {
+        change_id: 123711,
+        severity: ChangeSeverity::Warning,
+        summary: "The deprecated field `changelog-seen` has been removed. Using that field in `config.toml` from now on will result in breakage.",
+    },
 ];