Bazel 5.4.0 supports toolchain's registration only as a String, not L…

…abel

.bazeliskrc

@@ -0,0 +1 @@
+USE_BAZEL_VERSION=5.4.0

extras/gomock.bzl

@@ -79,6 +79,7 @@ def _gomock_source_impl(ctx):
             ctx.file.mockgen_tool,
             go_ctx.go,
         ],
+        toolchain = GO_TOOLCHAIN,
         command = """
             export GOPATH=$(pwd)/{gopath} &&
             {cmd} {args} > {out}
@@ -147,7 +148,7 @@ _gomock_source = rule(
             default = "//:go_context_data",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 
 def gomock(name, library, out, source = None, interfaces = [], package = "", self_package = "", aux_files = {}, mockgen_tool = _MOCKGEN_TOOL, imports = {}, copyright_file = None, mock_names = {}, **kwargs):
@@ -278,7 +279,7 @@ _gomock_prog_gen = rule(
             default = "//:go_context_data",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 
 def _gomock_prog_exec_impl(ctx):
@@ -360,7 +361,7 @@ _gomock_prog_exec = rule(
             default = "//:go_context_data",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 
 def _handle_shared_args(ctx, args):

go/private/common.bzl

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-GO_TOOLCHAIN = "@io_bazel_rules_go//go:toolchain"
+GO_TOOLCHAIN = Label("@io_bazel_rules_go//go:toolchain")
 
 go_exts = [
     ".go",

go/private/context.bzl

@@ -601,7 +601,7 @@ go_context_data = rule(
     },
     doc = """go_context_data gathers information about the build configuration.
     It is a common dependency of all Go targets.""",
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
     cfg = request_nogo_transition,
 )
 

go/private/rules/binary.bzl

@@ -411,7 +411,7 @@ _go_binary_kwargs = {
             default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
         ),
     },
-    "toolchains": [GO_TOOLCHAIN],
+    "toolchains": [str(GO_TOOLCHAIN)],
     "doc": """This builds an executable from a set of source files,
     which must all be in the `main` package. You can run the binary with
     `bazel run`, or you can build it with `bazel build` and run it directly.<br><br>

go/private/rules/go_bin_for_host.bzl

@@ -42,7 +42,7 @@ def _go_bin_for_host_impl(ctx):
 
 go_bin_for_host = rule(
     implementation = _go_bin_for_host_impl,
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
     # Resolve a toolchain that runs on the host platform.
     exec_compatible_with = HOST_CONSTRAINTS,
 )

go/private/rules/info.bzl

@@ -50,7 +50,7 @@ _go_info = rule(
             default = "//:go_context_data",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 
 def go_info():

go/private/rules/library.bzl

@@ -180,7 +180,7 @@ go_library = rule(
             default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
     doc = """This builds a Go library from a set of source files that are all part of
     the same package.<br><br>
     ***Note:*** For targets generated by Gazelle, `name` is typically the last component of the path,
@@ -211,7 +211,7 @@ go_tool_library = rule(
         "_cgo_context_data": attr.label(default = "//:cgo_context_data_proxy"),
         "_stdlib": attr.label(default = "//:stdlib"),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 # This is used instead of `go_library` for dependencies of the `nogo` rule and
 # packages that are depended on implicitly by code generated within the Go rules.

go/private/rules/nogo.bzl

@@ -106,7 +106,7 @@ _nogo = rule(
             default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
     cfg = go_tool_transition,
 )
 

go/private/rules/source.bzl

@@ -82,7 +82,7 @@ go_source = rule(
         "_go_config": attr.label(default = "//:go_config"),
         "_cgo_context_data": attr.label(default = "//:cgo_context_data_proxy"),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
     doc = """This declares a set of source files and related dependencies that can be embedded into one of the
     other rules.
     This is used as a way of easily declaring a common set of sources re-used in multiple rules.<br><br>

go/private/rules/stdlib.bzl

@@ -49,5 +49,5 @@ stdlib = rule(
     },
     doc = """stdlib builds the standard library for the target configuration
 or uses the precompiled standard library from the SDK if it is suitable.""",
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )

go/private/rules/test.bzl

@@ -441,7 +441,7 @@ _go_test_kwargs = {
     },
     "executable": True,
     "test": True,
-    "toolchains": [GO_TOOLCHAIN],
+    "toolchains": [str(GO_TOOLCHAIN)],
     "doc": """This builds a set of tests that can be run with `bazel test`.<br><br>
     To run all tests in the workspace, and print output on failure (the
     equivalent of `go test ./...`), run<br>

proto/compiler.bzl

@@ -218,7 +218,7 @@ _go_proto_compiler = rule(
             default = "//:go_context_data",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 
 def go_proto_compiler(name, **kwargs):

proto/def.bzl

@@ -77,7 +77,7 @@ _go_proto_aspect = aspect(
         "deps",
         "embed",
     ],
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 
 def _proto_library_to_source(_go, attr, source, merge):
@@ -178,7 +178,7 @@ go_proto_library = rule(
             default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
         ),
     },
-    toolchains = [GO_TOOLCHAIN],
+    toolchains = [str(GO_TOOLCHAIN)],
 )
 # go_proto_library is a rule that takes a proto_library (in the proto
 # attribute) and produces a go library for it.