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# Protocol Buffers - Google's data interchange format
# Copyright 2024 Google Inc. All rights reserved.
#
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd
#
"""
Toolchain helpers.
The helpers here should be used for a migration to toolchain in proto rules.
Anybody that needs them in another repository should copy them, because after
the migration is finished, the helpers can be removed.
"""
load("//bazel/common:proto_lang_toolchain_info.bzl", "ProtoLangToolchainInfo")
load("//bazel/private:native.bzl", "native_proto_common")
_incompatible_toolchain_resolution = getattr(native_proto_common, "INCOMPATIBLE_ENABLE_PROTO_TOOLCHAIN_RESOLUTION", False)
def _find_toolchain(ctx, legacy_attr, toolchain_type):
if _incompatible_toolchain_resolution:
toolchain = ctx.toolchains[toolchain_type]
if not toolchain:
fail("No toolchains registered for '%s'." % toolchain_type)
return toolchain.proto
else:
return getattr(ctx.attr, legacy_attr)[ProtoLangToolchainInfo]
def _use_toolchain(toolchain_type):
if _incompatible_toolchain_resolution:
return [config_common.toolchain_type(toolchain_type, mandatory = False)]
else:
return []
def _if_legacy_toolchain(legacy_attr_dict):
if _incompatible_toolchain_resolution:
return {}
else:
return legacy_attr_dict
toolchains = struct(
use_toolchain = _use_toolchain,
find_toolchain = _find_toolchain,
if_legacy_toolchain = _if_legacy_toolchain,
INCOMPATIBLE_ENABLE_PROTO_TOOLCHAIN_RESOLUTION = _incompatible_toolchain_resolution,
PROTO_TOOLCHAIN = Label("//bazel/private:proto_toolchain_type"),
)
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