doc: changelog

Author: aignas

CHANGELOG.md

@@ -52,15 +52,28 @@ Unreleased changes template.
 
 {#v0-0-0-changed}
 ### Changed
-* Nothing yet.
+
+**Breaking**:
+* (toolchains) stop exposing config settings in python toolchain alias repos.
+* (toolchains) consumers who were depending on the `MACOS_NAME` and the `arch`
+  attribute in the `PLATFORMS` list, please update your code to respect the new
+  values. The values now correspond to the values available in the
+  `@platforms//` package constraint values.
+
+Other changes:
+* Nothing yet
 
 {#v0-0-0-fixed}
 ### Fixed
-* Nothing yet.
+* (toolchains) stop depending on `uname` to get the value of the host platform.
 
 {#v0-0-0-added}
 ### Added
-* Nothing yet.
+* (toolchains) allow users to select which variant of the support host toolchain
+  they would like to use through
+  `RULES_PYTHON_REPO_TOOLCHAIN_{VERSION}_{OS}_{ARCH}` env variable setting. For
+  example, this allows one to use `freethreaded` python interpreter in the
+  `repository_rule` to build a wheel from `sdist`.
 
 {#v0-0-0-removed}
 ### Removed