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# Copyright 2018 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.
"""Library of functions that provide the CC_FLAGS Make variable."""
# This should match the logic in CcCommon.computeCcFlags:
def build_cc_flags(ctx, cc_toolchain, action_name):
"""Determine the value for CC_FLAGS based on the given toolchain."""
# Get default cc flags from toolchain's make_variables.
legacy_cc_flags = cc_common.legacy_cc_flags_make_variable_do_not_use(
cc_toolchain = cc_toolchain,
)
# Determine the sysroot flag.
sysroot_cc_flags = _from_sysroot(cc_toolchain)
# Flags from feature config.
feature_config_cc_flags = _from_features(ctx, cc_toolchain, action_name)
# Combine the different sources, but only add the sysroot flag if nothing
# else adds sysroot.
# If added, it must appear before the feature config flags.
cc_flags = []
if legacy_cc_flags:
cc_flags.append(legacy_cc_flags)
if sysroot_cc_flags and not _contains_sysroot(feature_config_cc_flags):
cc_flags.append(sysroot_cc_flags)
cc_flags.extend(feature_config_cc_flags)
return " ".join(cc_flags)
def _contains_sysroot(flags):
for flag in flags:
if "--sysroot=" in flag:
return True
return False
def _from_sysroot(cc_toolchain):
sysroot = cc_toolchain.sysroot
if sysroot:
return "--sysroot=%s" % sysroot
else:
return None
def _from_features(ctx, cc_toolchain, action_name):
feature_configuration = cc_common.configure_features(
ctx = ctx,
cc_toolchain = cc_toolchain,
requested_features = ctx.features,
unsupported_features = ctx.disabled_features,
)
variables = cc_common.empty_variables()
cc_flags = cc_common.get_memory_inefficient_command_line(
feature_configuration = feature_configuration,
action_name = action_name,
variables = variables,
)
return cc_flags
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