Update to bazel 8.0.0

.bazelignore

@@ -7,3 +7,6 @@ bazel-carbon-lang
 
 # See github_tools/MODULE.bazel.
 github_tools
+
+# Used as part of repo patching.
+third_party/boost_unordered

.bazelrc

@@ -22,6 +22,7 @@ build --flag_alias=nightly_date=//bazel/version:nightly_date
 build:clang-tidy --aspects @bazel_clang_tidy//clang_tidy:clang_tidy.bzl%clang_tidy_aspect
 build:clang-tidy --output_groups=report
 build:clang-tidy --@bazel_clang_tidy//:clang_tidy_config=//:clang_tidy_config
+build:clang-tidy --action_env=PATH --host_action_env=PATH
 
 # This warning seems to incorrectly fire in this build configuration, despite
 # not firing in our normal builds.
@@ -46,6 +47,10 @@ build --disk_cache=~/.cache/carbon-lang-build-cache
 # future Bazel releases.
 build --experimental_guard_against_concurrent_changes
 
+# Used by clang_configuration.bzl.
+build --action_env=CC --host_action_env=CC
+build --action_env=CMAKE_SYSROOT --host_action_env=CMAKE_SYSROOT
+
 # Disable warnings for all external compilations. These involve code that isn't
 # developed as part of Carbon and may be difficult or impossible to patch, so
 # warnings aren't likely to be actionable.
@@ -57,16 +62,6 @@ build --host_per_file_copt=external/.*\.(c|cc|cpp|cxx)$@-w
 build --per_file_copt=utils/treesitter/_treesitter.tree_sitter/.*\.c$@-w
 build --host_per_file_copt=utils/treesitter/_treesitter.tree_sitter/.*\.c$@-w
 
-# The `cc_proto_library` rule doesn't allow providing `copts`:
-# https://github.com/bazelbuild/bazel/issues/22610
-#
-# We unfortunately need to work around issues with `-Wmissing-prototypes` in
-# generated protobuf code, so pass the `copt` manually here. The warning issue
-# is likely part of:
-# https://github.com/llvm/llvm-project/issues/94138
-build --per_file_copt=.*\.pb\.cc$@-Wno-missing-prototypes
-build --host_per_file_copt=.*\.pb\.cc$@-Wno-missing-prototypes
-
 # Default dynamic linking to off. While this can help build performance in some
 # edge cases with very large linked executables and a slow linker, between using
 # fast linkers on all platforms (LLD and the Apple linker), as well as having
@@ -132,3 +127,19 @@ build --allow_unresolved_symlinks=false
 # Allow users to override any of the flags desired by importing a user-specific
 # RC file here if present.
 try-import %workspace%/user.bazelrc
+
+# TODO: WORKSPACE will be removed in bazel 9, should finish moving off.
+common --enable_workspace
+
+# The version of treesitter rules we're using depends on empty globs.
+# TODO: Look at the different rules in the registry.
+common --incompatible_disallow_empty_glob=false
+
+# TODO: Enable as many incompatible flags as we can, per
+# https://bazel.build/release/backward-compatibility. To get the latest list,
+# using `bazelisk --migrate build //...` will help.
+common --incompatible_strict_action_env
+
+# This excludes things like rules_android to reduce warnings.
+# TODO: Disable this completely.
+common --incompatible_autoload_externally=+@rules_java,+@rules_python,+@rules_shell

.bazelversion

@@ -1 +1 @@
-7.3.0
+8.0.0

.gdbinit

@@ -2,6 +2,6 @@
 # Exceptions. See /LICENSE for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-source external/_main~llvm_project~llvm-project/llvm/utils/gdb-scripts/prettyprinters.py
-source external/_main~llvm_project~llvm-project/libcxx/utils/gdb/libcxx/printers.py
+source external/+llvm_project+llvm-project/llvm/utils/gdb-scripts/prettyprinters.py
+source external/+llvm_project+llvm-project/libcxx/utils/gdb/libcxx/printers.py
 python register_libcxx_printer_loader()

.pre-commit-config.yaml

@@ -85,7 +85,7 @@ repos:
       - id: clang-format
         name: clang-format
         entry: clang-format
-        types_or: [c++, proto, def]
+        types_or: [c++, def]
         language: python
         args: ['-i']
         additional_dependencies: ['clang-format==17.0.1']
@@ -184,7 +184,7 @@ repos:
             Exceptions. See /LICENSE for license information.
             SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
           - --custom_format
-          - '\.(carbon|c|json|proto|scss|ypp)(\.tmpl)?$'
+          - '\.(carbon|c|json|scss|ypp)(\.tmpl)?$'
           - ''
           - '// '
           - ''

.vscode/lldb_launch.json

@@ -9,7 +9,7 @@
       "args": ["--file_tests=${relativeFile}"],
       "debuggerRoot": "${workspaceFolder}",
       "initCommands": [
-        "command script import external/_main~llvm_project~llvm-project/llvm/utils/lldbDataFormatters.py",
+        "command script import external/+llvm_project+llvm-project/llvm/utils/lldbDataFormatters.py",
         "settings set target.source-map \".\" \"${workspaceFolder}\""
       ],
       "env": { "TEST_TMPDIR": "/tmp" }
@@ -28,7 +28,7 @@
       ],
       "debuggerRoot": "${workspaceFolder}",
       "initCommands": [
-        "command script import external/_main~llvm_project~llvm-project/llvm/utils/lldbDataFormatters.py",
+        "command script import external/+llvm_project+llvm-project/llvm/utils/lldbDataFormatters.py",
         "settings set target.source-map \".\" \"${workspaceFolder}\""
       ]
     }

MODULE.bazel

@@ -29,11 +29,11 @@ http_archive = use_repo_rule(
 )
 
 bazel_dep(name = "bazel_skylib", version = "1.7.1")
-bazel_dep(name = "rules_pkg", version = "0.10.1")
-bazel_dep(name = "abseil-cpp", version = "20240116.2")
-bazel_dep(name = "re2", version = "2024-06-01")
-bazel_dep(name = "googletest", version = "1.14.0.bcr.1")
-bazel_dep(name = "google_benchmark", version = "1.8.4")
+bazel_dep(name = "rules_pkg", version = "1.0.1")
+bazel_dep(name = "abseil-cpp", version = "20240722.0.bcr.2")
+bazel_dep(name = "re2", version = "2024-07-02.bcr.1")
+bazel_dep(name = "googletest", version = "1.15.2")
+bazel_dep(name = "google_benchmark", version = "1.8.5")
 
 # The registry only has an old version. We use that here to avoid a miss but
 # override it with a newer version.
@@ -60,27 +60,15 @@ archive_override(
 bazel_dep(name = "tcmalloc", version = "0.0.0-20240411-5ed309d", dev_dependency = True)
 git_override(
     module_name = "tcmalloc",
-    # HEAD as of 2024-07-14.
-    commit = "923df94c922e0cd2d0512c1662d374f63c2c0c96",
+    # HEAD as of 2024-12-20.
+    commit = "91765c11461a01579fcbdddf430a556b818818c4",
     remote = "https://github.com/google/tcmalloc.git",
 )
 
-bazel_dep(name = "rules_bison", version = "0.2.2")
-bazel_dep(name = "rules_flex", version = "0.2.1")
-bazel_dep(name = "rules_m4", version = "0.2.3")
-bazel_dep(name = "rules_cc", version = "0.0.9")
-bazel_dep(name = "rules_proto", version = "6.0.2")
-bazel_dep(name = "protobuf", version = "27.1")
-
-libprotobuf_mutator_version = "1.3"
-
-http_archive(
-    name = "com_google_libprotobuf_mutator",
-    build_file = "@//:third_party/libprotobuf_mutator/BUILD.txt",
-    sha256 = "1ee3473a6b0274494fce599539605bb19305c0efadc62b58d645812132c31baa",
-    strip_prefix = "libprotobuf-mutator-{0}".format(libprotobuf_mutator_version),
-    urls = ["https://github.com/google/libprotobuf-mutator/archive/v{0}.tar.gz".format(libprotobuf_mutator_version)],
-)
+bazel_dep(name = "rules_bison", version = "0.3")
+bazel_dep(name = "rules_flex", version = "0.3")
+bazel_dep(name = "rules_m4", version = "0.2.4")
+bazel_dep(name = "rules_cc", version = "0.1.0")
 
 bazel_dep(name = "bazel_clang_tidy", dev_dependency = True)
 git_override(
@@ -118,7 +106,7 @@ http_archive(
 
 # Required for llvm-project.
 bazel_dep(name = "platforms", version = "0.0.10")
-bazel_dep(name = "zlib", version = "1.3.1.bcr.3", repo_name = "llvm_zlib")
+bazel_dep(name = "zlib", version = "1.3.1.bcr.4", repo_name = "llvm_zlib")
 bazel_dep(name = "zstd", version = "1.5.6", repo_name = "llvm_zstd")
 
 ###############################################################################
@@ -155,7 +143,7 @@ use_repo(llvm_project, "llvm-project")
 # Python
 ###############################################################################
 
-bazel_dep(name = "rules_python", version = "0.33.1")
+bazel_dep(name = "rules_python", version = "1.0.0")
 
 python = use_extension("@rules_python//python/extensions:python.bzl", "python")
 python.toolchain(