mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-04 22:02:52 +01:00
Chandler Carruth
94d9bff541
This requires re-working our config features to be usable in feature-level `requires` clauses in addition to `with_feature_set` by always including all of the features, but controlling whether the features are enabled or disabled based on the target. This is a little more verbose in the config features, but lets us use them more widely and is a bit more principled.
105 lines
3.0 KiB
Python
105 lines
3.0 KiB
Python
# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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# Exceptions. See /LICENSE for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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"""Definitions used for the base features of a `cc_toolchain_config`."""
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load(
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"@rules_cc//cc:cc_toolchain_config_lib.bzl",
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"feature",
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"feature_set",
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"flag_group",
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"flag_set",
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)
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load(
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":cc_toolchain_actions.bzl",
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"all_compile_actions",
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"all_link_actions",
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)
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# Declare features that are used by Bazel to model specific build modes.
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dbg_feature = feature(name = "dbg")
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fastbuild_feature = feature(name = "fastbuild")
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host_feature = feature(name = "host")
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opt_feature = feature(name = "opt")
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# Declare features that control enabling and disabling Bazel logic.
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no_legacy_features_feature = feature(name = "no_legacy_features")
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supports_pic_feature = feature(name = "supports_pic", enabled = True)
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supports_dynamic_linker_feature = feature(
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name = "supports_dynamic_linker",
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enabled = True,
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requires = [feature_set(["linux_target"])],
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)
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supports_start_end_lib_feature = feature(
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name = "supports_start_end_lib",
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enabled = True,
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requires = [feature_set(["linux_target"])],
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)
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user_flags_feature = feature(
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name = "user_flags",
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enabled = True,
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flag_sets = [
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flag_set(
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actions = all_compile_actions,
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flag_groups = [flag_group(
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expand_if_available = "user_compile_flags",
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flags = ["%{user_compile_flags}"],
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iterate_over = "user_compile_flags",
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)],
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),
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flag_set(
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actions = all_link_actions,
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flag_groups = [flag_group(
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expand_if_available = "user_link_flags",
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flags = ["%{user_link_flags}"],
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iterate_over = "user_link_flags",
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)],
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),
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],
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)
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# TODO: It's not clear this is the right location for these flags, and it is a
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# little awkward.
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output_flags_feature = feature(
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name = "output_flags",
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enabled = True,
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flag_sets = [
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flag_set(
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actions = all_compile_actions,
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flag_groups = [
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# For compile actions we have a single source and so put it at
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# the end next to the output.
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flag_group(
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expand_if_available = "source_file",
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flags = ["%{source_file}"],
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),
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flag_group(
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expand_if_available = "output_file",
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flags = ["-o", "%{output_file}"],
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),
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],
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),
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flag_set(
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actions = all_link_actions,
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flag_groups = [flag_group(
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expand_if_available = "output_execpath",
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flags = ["-o", "%{output_execpath}"],
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)],
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),
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],
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)
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base_features = [
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dbg_feature,
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fastbuild_feature,
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host_feature,
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no_legacy_features_feature,
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opt_feature,
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supports_pic_feature,
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supports_dynamic_linker_feature,
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supports_start_end_lib_feature,
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]
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