Upgrade to Bazel 8

.bazelrc

@@ -1,23 +1,41 @@
-build --define=scala_deps_direct=error
-build --define=scala_deps_used=error
+# Java options
+build --java_language_version="21"
+build --java_runtime_version="remotejdk_21"
+build --javacopt="-source 21 -target 21"
+build --tool_java_language_version="21"
+build --tool_java_runtime_version="remotejdk_21"
 
-build --experimental_strict_action_env
-test --experimental_strict_action_env
+# Other options
+build --experimental_use_hermetic_linux_sandbox
+build --experimental_worker_cancellation
+build --experimental_worker_multiplex_sandboxing
+build --strategy=worker,sandboxed,local
+build --verbose_failures
+build --worker_max_instances=4
+build --worker_sandboxing
 
-build --strategy=ScalaCompile=worker
-build --strategy=ScalaCheckDeps=worker
-build --strategy=ScalaFmt=worker
-test --strategy=ScalaCompile=worker
-test --strategy=ScalaCheckDeps=worker
-test --strategy=ScalaFmt=worker
-
-build --python_path=/usr/bin/python3
-run --python_path=/usr/bin/python3
-test --python_path=/usr/bin/python3
+common --announce_rc
+common --color=yes
+common --disk_cache=.bazel_cache
 
+# These are backwards incompatible options; we should check to see if their values have been flipped
+# when upgrading to new major Bazel version
+common --incompatible_auto_exec_groups
+common --incompatible_autoload_externally=sh_binary # sh_binary is used by rules_jvm_external
+common --incompatible_config_setting_private_default_visibility
+common --incompatible_disable_native_repo_rules
+common --incompatible_disable_starlark_host_transitions
+common --incompatible_disable_target_provider_fields
+common --incompatible_strict_action_env
 common --@rules_scala_annex//rules/scala:scala-toolchain=zinc
-common:v3.2 --config=noop
-common:v3.3 --config=noop
 
-# pick something trivial as a "noop"
-common:noop --logging=3
+# Unfortunately, this can't be enabled just yet because of
+# https://github.com/bazelbuild/rules_java/issues/264
+#common --incompatible_stop_exporting_language_modules
+
+# This is disabled because rules_python (and possibly other rulesets we depend on) rely on
+# deprecated `Label` APIs:
+# https://github.com/bazelbuild/rules_python/blob/main/python/private/pythons_hub.bzl#L82
+#common --noincompatible_enable_deprecated_label_apis
+
+test --test_output=all

.bazelversion

@@ -1 +1 @@
-7.4.1
+8.0.1

.gitignore

@@ -1,3 +1,4 @@
+/.bazel_cache/
 /bazel-*
 /external-tools/
 /temp

MODULE.bazel

@@ -6,13 +6,13 @@ bazel_dep(name = "rules_scala_annex")
 
 bazel_dep(name = "buildifier_prebuilt", version = "8.0.1", dev_dependency = True)
 
-rules_scala_annex_version = "lucid_2024-12-06"
+rules_scala_annex_version = "upgrade-to-bazel-8"
 
 archive_override(
     module_name = "rules_scala_annex",
-    integrity = "sha256-lSbyWlYtgP0ENngg4gKU1EBJ8d1sgMQKJlmOHwmCw3k=",
+    integrity = "sha256-O5U6tsd1xo1gkY+iL1si2Ssod34Xk7Ix/gDHytbU49c=",
     strip_prefix = "rules_scala-{}".format(rules_scala_annex_version),
-    urls = ["https://github.com/lucidsoftware/rules_scala/archive/refs/tags/{}.zip".format(rules_scala_annex_version)],
+    urls = ["https://github.com/lucidsoftware/rules_scala/archive/refs/heads/{}.zip".format(rules_scala_annex_version)],
 )
 
 register_toolchains("//scala:zinc")

rules/hocon.bzl

@@ -127,7 +127,7 @@ hocon_library = rule(
         ),
         "_hocon_compiler": attr.label(
             executable = True,
-            cfg = "host",
+            cfg = "exec",
             allow_files = True,
             default = Label("//hocon-compiler"),
         ),

tests/optional_includes/BUILD.bazel

@@ -10,13 +10,13 @@ hocon_library(
         "2.conf",
         "3.conf",
     ],
-    deps = glob(["config/2.conf"]) + glob(["config/3.conf"]),
+    deps = ["config/3.conf"],
 )
 
 hocon_library(
     name = "bad",
     src = "config/1.conf",
     out = "bad.conf",
     tags = ["manual"],
-    deps = glob(["config/2.conf"]) + glob(["config/3.conf"]),
+    deps = ["config/3.conf"],
 )