Rollup merge of #130202 - onur-ozkan:force-ci-llvm-on-default-profiles, r=Mark-Simulacrum

set `download-ci-llvm = true` by default on "library" and "tools" profiles

It's very rare for developers to need to modify LLVM, so "if-unchanged" isn't a good default for "tools" and "library" profiles since it fetches the LLVM submodule to track changes.

src/bootstrap/defaults/config.library.toml

@@ -13,4 +13,5 @@ lto = "off"
 
 [llvm]
 # Will download LLVM from CI if available on your platform.
-download-ci-llvm = "if-unchanged"
+# If you intend to modify `src/llvm-project`, use `"if-unchanged"` or `false` instead.
+download-ci-llvm = true

src/bootstrap/defaults/config.tools.toml

@@ -17,4 +17,5 @@ compiler-docs = true
 
 [llvm]
 # Will download LLVM from CI if available on your platform.
-download-ci-llvm = "if-unchanged"
+# If you intend to modify `src/llvm-project`, use `"if-unchanged"` or `false` instead.
+download-ci-llvm = true

src/bootstrap/src/utils/change_tracker.rs

@@ -255,4 +255,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Warning,
         summary: "`download-ci-llvm = true` now checks if CI llvm is available and has become the default for the compiler profile",
     },
+    ChangeInfo {
+        change_id: 130202,
+        severity: ChangeSeverity::Info,
+        summary: "'tools' and 'library' profiles switched `download-ci-llvm` option from `if-unchanged` to `true`.",
+    },
 ];