mirror of https://github.com/bazelbuild/rules_cc
80 lines
2.6 KiB
Python
80 lines
2.6 KiB
Python
# Copyright 2018 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Library of functions that provide the CC_FLAGS Make variable."""
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# This should match the logic in CcCommon.computeCcFlags:
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def build_cc_flags(ctx, cc_toolchain, action_name):
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"""Determine the value for CC_FLAGS based on the given toolchain.
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Args:
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ctx: The rule context.
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cc_toolchain: CcToolchainInfo instance.
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action_name: Name of the action.
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Returns:
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string containing flags separated by a space.
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"""
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# Get default cc flags from toolchain's make_variables.
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legacy_cc_flags = cc_common.legacy_cc_flags_make_variable_do_not_use(
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cc_toolchain = cc_toolchain,
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)
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# Determine the sysroot flag.
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sysroot_cc_flags = _from_sysroot(cc_toolchain)
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# Flags from feature config.
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feature_config_cc_flags = _from_features(ctx, cc_toolchain, action_name)
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# Combine the different sources, but only add the sysroot flag if nothing
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# else adds sysroot.
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# If added, it must appear before the feature config flags.
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cc_flags = []
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if legacy_cc_flags:
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cc_flags.append(legacy_cc_flags)
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if sysroot_cc_flags and not _contains_sysroot(feature_config_cc_flags):
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cc_flags.append(sysroot_cc_flags)
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cc_flags.extend(feature_config_cc_flags)
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return " ".join(cc_flags)
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def _contains_sysroot(flags):
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for flag in flags:
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if "--sysroot=" in flag:
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return True
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return False
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def _from_sysroot(cc_toolchain):
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sysroot = cc_toolchain.sysroot
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if sysroot:
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return "--sysroot=%s" % sysroot
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else:
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return None
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def _from_features(ctx, cc_toolchain, action_name):
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feature_configuration = cc_common.configure_features(
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ctx = ctx,
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cc_toolchain = cc_toolchain,
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requested_features = ctx.features,
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unsupported_features = ctx.disabled_features,
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)
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variables = cc_common.empty_variables()
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cc_flags = cc_common.get_memory_inefficient_command_line(
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feature_configuration = feature_configuration,
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action_name = action_name,
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variables = variables,
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)
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return cc_flags
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