Downgrade to kotlin 1.9.

The rest of androidx defaults to 1.8 currently,
and thus forcing a 2.1 dependency is undesirable.

Author: brettchabot

BUILD

@@ -1,6 +1,8 @@
 load("@rules_jvm_external//:defs.bzl", "artifact")
 load("@rules_license//rules:license.bzl", "license")
 load("//build_extensions/maven:maven_repo.bzl", "maven_repository")
+load("@io_bazel_rules_kotlin//kotlin:core.bzl", "define_kt_toolchain")
+load("//build_extensions:axt_deps_versions.bzl", "KOTLIN_LANG_VERSION")
 
 package(default_visibility = ["//:__subpackages__"])
 
@@ -10,6 +12,13 @@ exports_files([
     "repo.bzl",
 ])
 
+# Setup kotlin toolchain
+define_kt_toolchain(
+    name = "kotlin_toolchain",
+    api_version = KOTLIN_LANG_VERSION,
+    language_version = KOTLIN_LANG_VERSION,
+)
+
 # Creates maven release repository
 maven_repository(
     name = "axt_m2repository",

MODULE.bazel

@@ -1,6 +1,6 @@
 # These need needs to be consistent with their counterparts in build_extensions/axt_deps_versions.bzl.
-KOTLIN_VERSION = "2.1.0"
-KOTLINX_COROUTINES_VERSION = "1.10.1" 
+KOTLIN_VERSION = "1.9.21"
+KOTLINX_COROUTINES_VERSION = "1.8.1" 
 GRPC_VERSION = "1.71.0"
 
 bazel_dep(name = "rules_java", version = "8.6.3")

WORKSPACE

@@ -1,12 +1,12 @@
-#############################
-# Load Android Sdk
-#############################
+# Define project setup not yet supported in MODULE.bzlmod
+
 
-# This is needed by rules_kotlin.
-# TODO(brettchabot): move this to MODULE.bzlmod
+# Load Android Sdk
 
 android_sdk_repository(
     name = "androidsdk",
     api_level = 35,
     build_tools_version = "35.0.0",
 )
+
+register_toolchains("//:kotlin_toolchain")

build_extensions/axt_deps_versions.bzl

@@ -6,5 +6,8 @@
 
 # Maven dependency versions
 ANDROIDX_ANNOTATION_VERSION = "1.7.0"
-KOTLIN_VERSION = "2.1.0"
+KOTLIN_VERSION = "1.9.21"
+KOTLIN_LANG_VERSION = "1.9"
 GRPC_VERSION = "1.71.0"
+
+

core/CHANGELOG.md

@@ -6,6 +6,8 @@
 
 **Bug Fixes**
 
+* Downgrade to kotlin 1.9
+
 **New Features**
 
 **Breaking Changes**

espresso/CHANGELOG.md

@@ -16,6 +16,8 @@ The following artifacts were released:
 
 **Bug Fixes**
 
+* Downgrade to kotlin 1.9
+
 **New Features**
 
 **Breaking Changes**

espresso/device/CHANGELOG.md

@@ -6,6 +6,8 @@
 
 **Bug Fixes**
 
+* Downgrade to kotlin 1.9
+
 **New Features**
 
 **Breaking Changes**

ext/junit/CHANGELOG.md

@@ -7,6 +7,8 @@ are released.
 
 **Bug Fixes**
 
+* Downgrade to kotlin 1.9
+
 **New Features**
 
 **Breaking Changes**

runner/android_junit_runner/CHANGELOG.md

@@ -6,6 +6,8 @@
 
 **Bug Fixes**
 
+* Downgrade to kotlin 1.9
+
 **New Features**
 
 **Breaking Changes**

runner/android_test_orchestrator/CHANGELOG.md

@@ -6,6 +6,8 @@
 
 **Bug Fixes**
 
+* Downgrade to kotlin 1.9
+
 **New Features**
 
 **Breaking Changes**