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# pylint: disable=g-bad-file-header
# Copyright 2016 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.
"""Finds the c++ toolchain if it is enabled.
Otherwise, falls back to a toolchain constructed from the CppConfiguration.
"""
def _get_cpp_toolchain_attr(ctx, attr):
if hasattr(ctx.attr._cc_toolchain[cc_common.CcToolchainInfo], attr):
return getattr(ctx.attr._cc_toolchain[cc_common.CcToolchainInfo], attr)
else:
return getattr(ctx.fragments.cpp, attr)
def _make_legacy_toolchain(ctx):
return struct(
objcopy_executable = _get_cpp_toolchain_attr(ctx, "objcopy_executable"),
compiler_executable = _get_cpp_toolchain_attr(ctx, "compiler_executable"),
preprocessor_executable = _get_cpp_toolchain_attr(ctx, "preprocessor_executable"),
nm_executable = _get_cpp_toolchain_attr(ctx, "nm_executable"),
objdump_executable = _get_cpp_toolchain_attr(ctx, "objdump_executable"),
ar_executable = _get_cpp_toolchain_attr(ctx, "ar_executable"),
strip_executable = _get_cpp_toolchain_attr(ctx, "strip_executable"),
ld_executable = _get_cpp_toolchain_attr(ctx, "ld_executable"),
)
def find_cpp_toolchain(ctx):
"""If the c++ toolchain is in use, returns it.
Otherwise, returns a c++ toolchain derived from legacy toolchain selection.
Args:
ctx: The rule context for which to find a toolchain.
Returns:
A CcToolchainProvider.
"""
if Label("@bazel_tools//tools/cpp:toolchain_type") in ctx.fragments.platform.enabled_toolchain_types:
return ctx.toolchains["@bazel_tools//tools/cpp:toolchain_type"]
else:
return _make_legacy_toolchain(ctx)
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