chore: add Bazel 8 testing

Author: alexeagle

.bazelversion

@@ -1,4 +1,4 @@
-7.0.2
+8.0.0
 # The first line of this file is used by Bazelisk and Bazel to be sure
 # the right version of Bazel is used to build and test this repo.
 # This also defines which version is used on CI.

.bcr/presubmit.yml

@@ -2,7 +2,7 @@ bcr_test_module:
   module_path: "e2e/smoke"
   matrix:
     platform: ["debian10", "macos", "ubuntu2004", "windows"]
-    bazel: ["7.x"]
+    bazel: ["7.x", "8.x"]
   tasks:
     run_tests:
       name: "Run test module"

.github/workflows/ci.yaml

@@ -18,13 +18,6 @@ concurrency:
 
 jobs:
   test:
-    uses: bazel-contrib/.github/.github/workflows/bazel.yaml@v6
+    uses: bazel-contrib/.github/.github/workflows/bazel.yaml@646899086d7aaee8e532540480f3e91e00596234 # Dec 11 2024
     with:
       folders: '[".", "e2e/smoke", "examples"]'
-      exclude: |
-        [
-          {"bazelversion": "6.4.0"},
-          {"folder": ".", "bzlmodEnabled": false},
-          {"folder": "examples", "bzlmodEnabled": false},
-          {"folder": ".", "os": "windows-latest"}
-        ]

MODULE.bazel

@@ -16,7 +16,7 @@ bazel_dep(name = "buildifier_prebuilt", version = "6.1.2", dev_dependency = True
 
 protoc = use_extension("@toolchains_protoc//protoc:extensions.bzl", "protoc")
 protoc.toolchain(
-    version = "v27.3",
+    version = "v28.2",
 )
 use_repo(protoc, "toolchains_protoc_hub")
 

README.md

@@ -1,12 +1,4 @@
-# Pre-built protoc toolchain for Bazel 7
-
-> [!CAUTION]
-> Bazel 8 and recent rules_proto changes broke this toolchain.
-> We don't currently have any plans to address this.
-> Instead, we expect someone on the protobuf team to follow through with the
-> "End Goal" promised in https://protobuf.dev/news/2024-10-01/
-> where this functionality is upstreamed.
-> Follow https://github.com/protocolbuffers/protobuf/issues/19558
+# Pre-built protoc toolchain for Bazel
 
 _#NeverCompileProtocAgain_
 

e2e/smoke/.bazelversion

@@ -0,0 +1 @@
+8.0.0

e2e/smoke/MODULE.bazel

@@ -1,5 +1,5 @@
 bazel_dep(name = "toolchains_protoc", version = "0.0.0")
-bazel_dep(name = "rules_proto", version = "6.0.0-rc2")
+bazel_dep(name = "rules_proto", version = "7.1.0")
 
 local_path_override(
     module_name = "toolchains_protoc",