Remove toolchain_rule.

It's unneeded syntactic sugar, we can re-introduce it later if it seems
warranted.

Change-Id: If41e10f96ae0b6ac522a1da36237ff1b3c91757d
PiperOrigin-RevId: 156184854

3 files changed, 0 insertions, 66 deletions

diff --git a/tools/platforms/BUILD b/tools/platforms/BUILD
index a54e5e6ea9..4e788aea2c 100644
--- a/tools/platforms/BUILD
+++ b/tools/platforms/BUILD
@@ -6,7 +6,6 @@ filegroup(
     name = "package-srcs",
     srcs = [
         "platforms.BUILD",
-        "toolchains.bzl",
     ],
 )
 
diff --git a/tools/platforms/platforms.BUILD b/tools/platforms/platforms.BUILD
index dd12d661f4..4e477e72a8 100644
--- a/tools/platforms/platforms.BUILD
+++ b/tools/platforms/platforms.BUILD
@@ -4,8 +4,6 @@ package(
     default_visibility = ["//visibility:public"],
 )
 
-export_files = ["toolchains.bzl"]
-
 # These match values in //src/main/java/com/google/build/lib/util:CPU.java
 constraint_setting(name = "cpu")
 
diff --git a/tools/platforms/toolchains.bzl b/tools/platforms/toolchains.bzl
deleted file mode 100644
index b931905eeb..0000000000
--- a/tools/platforms/toolchains.bzl
+++ /dev/null
@@ -1,63 +0,0 @@
-# Copyright 2017 The Bazel Authors. All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-"""Useful functions and rules for defining toolchains."""
-
-_default_toolchain_rule_attrs = {
-    "exec_compatible_with": attr.label_list(
-        providers = [platform_common.ConstraintValueInfo]),
-    "target_compatible_with": attr.label_list(
-        providers = [platform_common.ConstraintValueInfo]),
-}
-
-def default_toolchain_rule_impl(ctx, override_attrs = {}):
-  """A default implementation for toolchain_rule.
-  This implementation creates a toolchain provider and adds all extra
-  attributes.
-
-  Args:
-    ctx: The rule context.
-    override_attrs: Any data in this dict will override the corresponding
-      attribute from the context. toolchain_rule implementations can use this
-      to customize the values set in the provider.
-
-  Returns:
-    The created toolchain provider.
-  """
-  toolchain_data = {}
-
-  # Collect the extra_args from ctx.attrs.
-  attr_names = ctx.attr._extra_attr_names
-  for name in attr_names:
-    if name in override_attrs:
-      attr = override_attrs[name]
-    else:
-      attr = getattr(ctx.attr, name)
-    toolchain_data[name] = attr
-
-  toolchain = platform_common.toolchain(
-      exec_compatible_with = ctx.attr.exec_compatible_with,
-      target_compatible_with = ctx.attr.target_compatible_with,
-      **toolchain_data)
-
-  return [toolchain]
-
-def toolchain_rule(implementation = default_toolchain_rule_impl, fragments = [], extra_attrs = {}):
-  return rule(
-      implementation = implementation,
-      attrs = _default_toolchain_rule_attrs + extra_attrs + {
-          # default_toolchain_rule_impl needs this to know what attributes are extra args.
-          "_extra_attr_names": attr.string_list(default = extra_attrs.keys()),
-      },
-      fragments = fragments,
-  )