Dropped support for Bazel 7.

This was previously announced here: https://protobuf.dev/support/migration/#dropped-bazel-7-support

#test-continuous

PiperOrigin-RevId: 870256373

.github/workflows/test_cpp.yml

@@ -40,10 +40,6 @@ jobs:
           - image: us-docker.pkg.dev/protobuf-build/containers/test/linux/sanitize:8.0.1-b77fdae6d4771789dfc66a56bf8d806354e8011a
           - targets: //pkg/... //src/... //third_party/utf8_range/... //conformance:conformance_framework_tests
           # Override cases with custom images
-          - config: { name: "Bazel7", flags: --cxxopt="-Wno-self-assign-overloaded" }
-            cache_key: Bazel7bzlmod
-            image: "us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:7.6.1-e0df73e51131ccaf53451355d22577f377357604"
-            targets: "//src/... //third_party/utf8_range/..."
           - config: { name: "Bazel8", flags: --cxxopt="-Wno-self-assign-overloaded" }
             cache_key: Bazel8
             image: "us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:8.0.1-e78301df86b3e4c46ec9ac4d98be00e19305d8f3"

.github/workflows/test_java.yml

@@ -44,10 +44,6 @@ jobs:
             cache_key: '17'
             image: us-docker.pkg.dev/protobuf-build/containers/test/linux/java:8.0.1-17-168f9c9d015a0fa16611e1e9eede796fe9bfbb69
             targets: //java/... //java/internal:java_version //compatibility/...
-          - name: Bazel7
-            cache_key: 'bazel7bzlmod'
-            image: us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:7.6.1-e0df73e51131ccaf53451355d22577f377357604
-            targets: //java/... //java/internal:java_version //compatibility/...
           # TODO: b/395623141 - restore this test once runtime uses / emulates aarch64.
           # - name: aarch64
           #   cache_key: 'aarch64'

MODULE.bazel

@@ -44,14 +44,6 @@ bazel_dep(name = "rules_license", version = "1.0.0")
 bazel_dep(name = "rules_pkg", version = "1.0.1")
 bazel_dep(name = "rules_python", version = "1.6.0")
 
-# Pin to rules_proto to 7.1.0 to avoid toolchain incompatibilities when
-# --incompatible_enable_proto_toolchain_resolution=true in Bazel 7.
-# rules_proto 7.0.2 from deps incorrectly rules_proto's toolchain_type but protobuf's toolchain, but
-# 7.1.0 uses protobuf's toolchain and toolchain_type.
-# TODO: Restore to dev_dependency once Bazel 7 is dropped.
-# rules_proto is needed for @com_google_protobuf_v25 used in //compatibility/... tests
-bazel_dep(name = "rules_proto", version = "7.1.0")
-
 bazel_dep(name = "rules_rust", version = "0.63.0", dev_dependency = True)
 bazel_dep(name = "rules_ruby", version = "0.17.3", dev_dependency = True)
 

README.md

@@ -36,7 +36,7 @@ release commits.
 ### Bazel with Bzlmod
 
 Protobuf supports
-[Bzlmod](https://bazel.build/external/module) with Bazel 7 +.
+[Bzlmod](https://bazel.build/external/module) with Bazel 8 +.
 Users should specify a dependency on protobuf in their MODULE.bazel file as
 follows.
 

WORKSPACE

@@ -1,13 +1,5 @@
 workspace(name = "com_google_protobuf")
 
-# An explicit self-reference to work around changes in Bazel 7.0
-# See https://github.com/bazelbuild/bazel/issues/19973#issuecomment-1787814450
-# buildifier: disable=duplicated-name
-local_repository(
-    name = "com_google_protobuf",
-    path = ".",
-)
-
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 # Load common dependencies first to ensure we use the correct version

bazel/cc_proto_library.bzl

@@ -9,9 +9,4 @@
 
 load("//bazel/private/oss:cc_proto_library.bzl", _cc_proto_library = "cc_proto_library")
 
-def cc_proto_library(**kwattrs):
-    # Only use Starlark rules when they are removed from Bazel
-    if not hasattr(native, "cc_proto_library"):
-        _cc_proto_library(**kwattrs)
-    else:
-        native.cc_proto_library(**kwattrs)  # buildifier: disable=native-cc-proto
+cc_proto_library = _cc_proto_library

bazel/java_lite_proto_library.bzl

@@ -9,9 +9,4 @@
 
 load("//bazel/private:java_lite_proto_library.bzl", _java_lite_proto_library = "java_lite_proto_library")
 
-def java_lite_proto_library(**kwattrs):
-    # Only use Starlark rules when they are removed from Bazel
-    if not hasattr(native, "java_lite_proto_library"):
-        _java_lite_proto_library(**kwattrs)
-    else:
-        native.java_lite_proto_library(**kwattrs)  # buildifier: disable=native-java-lite-proto
+java_lite_proto_library = _java_lite_proto_library

bazel/java_proto_library.bzl

@@ -9,9 +9,4 @@
 
 load("//bazel/private:java_proto_library.bzl", _java_proto_library = "java_proto_library")
 
-def java_proto_library(**kwattrs):
-    # Only use Starlark rules when they are removed from Bazel
-    if not hasattr(native, "java_proto_library"):
-        _java_proto_library(**kwattrs)
-    else:
-        native.java_proto_library(**kwattrs)  # buildifier: disable=native-java-proto
+java_proto_library = _java_proto_library

bazel/private/oss/cc_proto_library.bzl

@@ -59,14 +59,8 @@ def _aspect_impl(target, ctx):
 
     if should_generate_code:
         if len(proto_info.direct_sources) != 0:
-            # Bazel 7 didn't expose cc_proto_library_source_suffixes used by Kythe
-            # gradually falling back to .pb.cc
-            if type(get_flag_value(ctx, "cc_proto_library_source_suffixes")) == "builtin_function_or_method":
-                source_suffixes = [".pb.cc"]
-                header_suffixes = [".pb.h"]
-            else:
-                source_suffixes = get_flag_value(ctx, "cc_proto_library_source_suffixes")
-                header_suffixes = get_flag_value(ctx, "cc_proto_library_header_suffixes")
+            source_suffixes = get_flag_value(ctx, "cc_proto_library_source_suffixes")
+            header_suffixes = get_flag_value(ctx, "cc_proto_library_header_suffixes")
             sources = _get_output_files(ctx.actions, proto_info, source_suffixes)
             headers = _get_output_files(ctx.actions, proto_info, header_suffixes)
             header_provider = _ProtoCcHeaderInfo(headers = depset(headers))

bazel/private/oss/toolchains/BUILD.bazel

@@ -46,32 +46,6 @@ toolchain(
     toolchain_type = "//bazel/private:python_toolchain_type",
 )
 
-# Following toolchain registrations are for builtin Bazel 7 rules
-# which defined them in other repositories.
-toolchain(
-    name = "cc_source_toolchain_bazel7",
-    exec_compatible_with = [],
-    target_compatible_with = [],
-    toolchain = "//:cc_toolchain",
-    toolchain_type = "@rules_cc//cc/proto:toolchain_type",
-)
-
-toolchain(
-    name = "java_source_toolchain_bazel7",
-    exec_compatible_with = [],
-    target_compatible_with = [],
-    toolchain = "//java/core:toolchain",
-    toolchain_type = "@rules_java//java/proto:toolchain_type",
-)
-
-toolchain(
-    name = "javalite_source_toolchain_bazel7",
-    exec_compatible_with = [],
-    target_compatible_with = [],
-    toolchain = "//java/lite:toolchain",
-    toolchain_type = "@rules_java//java/proto:lite_toolchain_type",
-)
-
 filegroup(
     name = "for_bazel_tests",
     testonly = True,

bazel/proto_library.bzl

@@ -9,10 +9,4 @@
 
 load("//bazel/private:proto_library_rule.bzl", _proto_library = "proto_library")
 
-def proto_library(**kwattrs):
-    # Only use Starlark rules when they are removed from Bazel.
-    if not hasattr(native, "proto_library"):
-        _proto_library(**kwattrs)
-    else:
-        # On older Bazel versions keep using native rules, so that mismatch in ProtoInfo doesn't happen
-        native.proto_library(**kwattrs)  # buildifier: disable=native-proto
+proto_library = _proto_library

bazel/tests/protobuf_test_proto_library.bzl

@@ -1,20 +0,0 @@
-"""This module defines a wrapper around proto_library for Bazel versions that do not support certain attributes yet."""
-
-load("//bazel:proto_library.bzl", "proto_library")
-
-def protobuf_test_proto_library(**kwattrs):
-    """
-    Creates a proto library, handling any attributes that are not supported by the proto_library rule.
-
-    Args:
-        **kwattrs: Additional arguments to pass to the proto_library rule.
-    """
-    kwargs = dict(kwattrs)
-
-    # TODO: Bazel 7's proto_library rule does not support option_deps, so we handle it by putting it in deps instead.
-    if "option_deps" in kwargs and hasattr(native, "proto_library"):
-        deps = kwargs.pop("deps", [])
-        option_deps = kwargs.pop("option_deps")
-        kwargs["deps"] = depset(deps + option_deps).to_list()
-
-    proto_library(**kwargs)

ci/common.bazelrc

@@ -34,11 +34,6 @@ build:ubsan --copt=-fno-sanitize=function --copt=-fno-sanitize=vptr
 # Abseil passes nullptr to memcmp with 0 size
 build:ubsan --copt=-fno-sanitize=nonnull-attribute
 
-# Workaround Bazel 7 remote cache issues.
-# See https://github.com/bazelbuild/bazel/issues/20161
-build --experimental_remote_cache_eviction_retries=5
-build --remote_download_outputs=all
-
 # Build with all --incompatible flags that we can. This helps us prepare for
 # upcoming breaking changes in Bazel. This list was generated for Bazel 6 by
 # running bazelisk with the --migrate flag and filtering out all flags that

java/core/BUILD.bazel

@@ -7,10 +7,6 @@ load("//bazel:cc_proto_library.bzl", "cc_proto_library")
 load("//bazel:java_lite_proto_library.bzl", "java_lite_proto_library")
 load("//bazel:java_proto_library.bzl", "java_proto_library")
 load("//bazel:proto_library.bzl", "proto_library")
-load(
-    "//bazel/tests:protobuf_test_proto_library.bzl",
-    "protobuf_test_proto_library",
-)
 load("//bazel/toolchains:proto_lang_toolchain.bzl", "proto_lang_toolchain")
 load("//build_defs:java_opts.bzl", "protobuf_java_export", "protobuf_java_library", "protobuf_versioned_java_library")
 load("//conformance:defs.bzl", "conformance_test")
@@ -345,7 +341,7 @@ proto_lang_toolchain(
     visibility = ["//visibility:public"],
 )
 
-protobuf_test_proto_library(
+proto_library(
     name = "java_test_protos",
     srcs = glob([
         "src/test/proto/**/*.proto",

protobuf_deps.bzl

@@ -53,17 +53,6 @@ def _github_archive(repo, commit, **kwargs):
 def protobuf_deps():
     """Loads common dependencies needed to compile the protobuf library."""
 
-    # Pin rules_proto since Bazel 7 otherwise depends on rules_proto 5.3.0-21.7 which is missing
-    # @rules_proto//proto:toolchain_type used by Bazel.
-    # 6.0.0 would at least require users to add `register_toolchains` for rules_proto
-    # TODO: Remove once Bazel 7 is no longer supported.
-    if not native.existing_rule("rules_proto"):
-        http_archive(
-            name = "rules_proto",
-            sha256 = "14a225870ab4e91869652cfd69ef2028277fc1dc4910d65d353b62d6e0ae21f4",
-            strip_prefix = "rules_proto-7.1.0",
-            url = "https://github.com/bazelbuild/rules_proto/releases/download/7.1.0/rules_proto-7.1.0.tar.gz",
-        )
     if not native.existing_rule("bazel_features"):
         http_archive(
             name = "bazel_features",

src/google/protobuf/BUILD.bazel

@@ -6,10 +6,6 @@ load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
 load("@rules_pkg//pkg:mappings.bzl", "pkg_files", "strip_prefix")
 load("//bazel:cc_proto_library.bzl", "cc_proto_library")
 load("//bazel:proto_library.bzl", "proto_library")
-load(
-    "//bazel/tests:protobuf_test_proto_library.bzl",
-    "protobuf_test_proto_library",
-)
 load("//build_defs:cpp_opts.bzl", "COPTS", "LINK_OPTS")
 load("//upb/bazel:upb_c_proto_library.bzl", "upb_c_proto_library")
 load("//upb/bazel:upb_minitable_proto_library.bzl", "upb_minitable_proto_library")
@@ -1154,7 +1150,7 @@ filegroup(
     visibility = ["//:__subpackages__"],
 )
 
-protobuf_test_proto_library(
+proto_library(
     name = "test_protos",
     srcs = [
         "any_test.proto",
@@ -1296,7 +1292,7 @@ cc_proto_library(
     deps = [":unittest_features_proto"],
 )
 
-protobuf_test_proto_library(
+proto_library(
     name = "generic_test_protos",
     srcs = [":test_proto_srcs"],
     option_deps = [
@@ -1322,7 +1318,7 @@ protobuf_test_proto_library(
     ],
 )
 
-protobuf_test_proto_library(
+proto_library(
     name = "generic_test_editions_protos",
     srcs = [":test_proto_editions_srcs"],
     option_deps = [
@@ -1432,7 +1428,7 @@ proto_library(
     ],
 )
 
-protobuf_test_proto_library(
+proto_library(
     name = "unittest_import_option_proto",
     srcs = ["unittest_import_option.proto"],
     option_deps = [