mirror of
https://github.com/bazelbuild/rules_cc
synced 2024-11-27 20:43:26 +00:00
0c017ebc6d
https://github.com/bazelbuild/bazel/issues/6861 RELNOTES: None. PiperOrigin-RevId: 238941083
565 lines
20 KiB
Python
565 lines
20 KiB
Python
"""Module providing migrate_legacy_fields function.
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migrate_legacy_fields takes parsed CROSSTOOL proto and migrates it (inplace) to
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use only the features.
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Tracking issue: https://github.com/bazelbuild/bazel/issues/5187
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Since C++ rules team is working on migrating CROSSTOOL from text proto into
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Starlark, we advise CROSSTOOL owners to wait for the CROSSTOOL -> Starlark
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migrator before they invest too much time into fixing their pipeline. Tracking
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issue for the Starlark effort is
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https://github.com/bazelbuild/bazel/issues/5380.
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"""
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from third_party.com.github.bazelbuild.bazel.src.main.protobuf import crosstool_config_pb2
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ALL_CC_COMPILE_ACTIONS = [
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"assemble", "preprocess-assemble", "linkstamp-compile", "c-compile",
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"c++-compile", "c++-header-parsing", "c++-module-compile",
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"c++-module-codegen", "lto-backend", "clif-match"
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]
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ALL_OBJC_COMPILE_ACTIONS = [
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"objc-compile", "objc++-compile"
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]
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ALL_CXX_COMPILE_ACTIONS = [
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action for action in ALL_CC_COMPILE_ACTIONS
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if action not in ["c-compile", "preprocess-assemble", "assemble"]
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]
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ALL_CC_LINK_ACTIONS = [
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"c++-link-executable", "c++-link-dynamic-library",
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"c++-link-nodeps-dynamic-library"
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]
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ALL_OBJC_LINK_ACTIONS = [
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"objc-executable", "objc++-executable",
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]
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DYNAMIC_LIBRARY_LINK_ACTIONS = [
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"c++-link-dynamic-library", "c++-link-nodeps-dynamic-library"
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]
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NODEPS_DYNAMIC_LIBRARY_LINK_ACTIONS = ["c++-link-nodeps-dynamic-library"]
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TRANSITIVE_DYNAMIC_LIBRARY_LINK_ACTIONS = ["c++-link-dynamic-library"]
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TRANSITIVE_LINK_ACTIONS = ["c++-link-executable", "c++-link-dynamic-library"]
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CC_LINK_EXECUTABLE = ["c++-link-executable"]
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def compile_actions(toolchain):
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"""Returns compile actions for cc or objc rules."""
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if _is_objc_toolchain(toolchain):
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return ALL_CC_COMPILE_ACTIONS + ALL_OBJC_COMPILE_ACTIONS
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else:
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return ALL_CC_COMPILE_ACTIONS
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def link_actions(toolchain):
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"""Returns link actions for cc or objc rules."""
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if _is_objc_toolchain(toolchain):
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return ALL_CC_LINK_ACTIONS + ALL_OBJC_LINK_ACTIONS
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else:
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return ALL_CC_LINK_ACTIONS
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def executable_link_actions(toolchain):
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"""Returns transitive link actions for cc or objc rules."""
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if _is_objc_toolchain(toolchain):
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return CC_LINK_EXECUTABLE + ALL_OBJC_LINK_ACTIONS
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else:
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return CC_LINK_EXECUTABLE
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def _is_objc_toolchain(toolchain):
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return any(ac.action_name == "objc-compile" for ac in toolchain.action_config)
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# Map converting from LinkingMode to corresponding feature name
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LINKING_MODE_TO_FEATURE_NAME = {
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"FULLY_STATIC": "fully_static_link",
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"MOSTLY_STATIC": "static_linking_mode",
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"DYNAMIC": "dynamic_linking_mode",
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"MOSTLY_STATIC_LIBRARIES": "static_linking_mode_nodeps_library",
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}
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def migrate_legacy_fields(crosstool):
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"""Migrates parsed crosstool (inplace) to not use legacy fields."""
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crosstool.ClearField("default_toolchain")
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for toolchain in crosstool.toolchain:
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_ = [_migrate_expand_if_all_available(f) for f in toolchain.feature]
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_ = [_migrate_expand_if_all_available(ac) for ac in toolchain.action_config]
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_ = [_migrate_repeated_expands(f) for f in toolchain.feature]
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_ = [_migrate_repeated_expands(ac) for ac in toolchain.action_config]
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if (toolchain.dynamic_library_linker_flag or
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_contains_dynamic_flags(toolchain)) and not _get_feature(
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toolchain, "supports_dynamic_linker"):
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feature = toolchain.feature.add()
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feature.name = "supports_dynamic_linker"
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feature.enabled = True
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if toolchain.supports_start_end_lib and not _get_feature(
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toolchain, "supports_start_end_lib"):
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feature = toolchain.feature.add()
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feature.name = "supports_start_end_lib"
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feature.enabled = True
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if toolchain.supports_interface_shared_objects and not _get_feature(
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toolchain, "supports_interface_shared_libraries"):
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feature = toolchain.feature.add()
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feature.name = "supports_interface_shared_libraries"
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feature.enabled = True
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if toolchain.supports_embedded_runtimes and not _get_feature(
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toolchain, "static_link_cpp_runtimes"):
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feature = toolchain.feature.add()
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feature.name = "static_link_cpp_runtimes"
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feature.enabled = True
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if toolchain.needsPic and not _get_feature(toolchain, "supports_pic"):
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feature = toolchain.feature.add()
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feature.name = "supports_pic"
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feature.enabled = True
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if toolchain.supports_fission and not _get_feature(
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toolchain, "per_object_debug_info"):
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# feature {
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# name: "per_object_debug_info"
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# enabled: true
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# flag_set {
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# action: "assemble"
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# action: "preprocess-assemble"
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# action: "c-compile"
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# action: "c++-compile"
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# action: "c++-module-codegen"
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# action: "lto-backend"
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# flag_group {
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# expand_if_all_available: 'is_using_fission'",
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# flag: "-gsplit-dwarf"
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# }
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# }
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# }
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feature = toolchain.feature.add()
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feature.name = "per_object_debug_info"
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feature.enabled = True
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flag_set = feature.flag_set.add()
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flag_set.action[:] = [
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"c-compile", "c++-compile", "c++-module-codegen", "assemble",
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"preprocess-assemble", "lto-backend"
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]
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flag_group = flag_set.flag_group.add()
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flag_group.expand_if_all_available[:] = ["is_using_fission"]
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flag_group.flag[:] = ["-gsplit-dwarf"]
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if toolchain.objcopy_embed_flag and not _get_feature(
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toolchain, "objcopy_embed_flags"):
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feature = toolchain.feature.add()
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feature.name = "objcopy_embed_flags"
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feature.enabled = True
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flag_set = feature.flag_set.add()
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flag_set.action[:] = ["objcopy_embed_data"]
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flag_group = flag_set.flag_group.add()
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flag_group.flag[:] = toolchain.objcopy_embed_flag
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action_config = toolchain.action_config.add()
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action_config.action_name = "objcopy_embed_data"
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action_config.config_name = "objcopy_embed_data"
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action_config.enabled = True
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tool = action_config.tool.add()
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tool.tool_path = _find_tool_path(toolchain, "objcopy")
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if toolchain.ld_embed_flag and not _get_feature(
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toolchain, "ld_embed_flags"):
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feature = toolchain.feature.add()
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feature.name = "ld_embed_flags"
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feature.enabled = True
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flag_set = feature.flag_set.add()
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flag_set.action[:] = ["ld_embed_data"]
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flag_group = flag_set.flag_group.add()
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flag_group.flag[:] = toolchain.ld_embed_flag
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action_config = toolchain.action_config.add()
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action_config.action_name = "ld_embed_data"
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action_config.config_name = "ld_embed_data"
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action_config.enabled = True
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tool = action_config.tool.add()
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tool.tool_path = _find_tool_path(toolchain, "ld")
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# Create default_link_flags feature for linker_flag
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flag_sets = _extract_legacy_link_flag_sets_for(toolchain)
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if flag_sets:
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if _get_feature(toolchain, "default_link_flags"):
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continue
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if _get_feature(toolchain, "legacy_link_flags"):
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for f in toolchain.feature:
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if f.name == "legacy_link_flags":
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f.ClearField("flag_set")
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feature = f
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_rename_feature_in_toolchain(toolchain, "legacy_link_flags",
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"default_link_flags")
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break
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else:
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feature = _prepend_feature(toolchain)
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feature.name = "default_link_flags"
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feature.enabled = True
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_add_flag_sets(feature, flag_sets)
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# Create default_compile_flags feature for compiler_flag, cxx_flag
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flag_sets = _extract_legacy_compile_flag_sets_for(toolchain)
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if flag_sets and not _get_feature(toolchain, "default_compile_flags"):
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if _get_feature(toolchain, "legacy_compile_flags"):
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for f in toolchain.feature:
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if f.name == "legacy_compile_flags":
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f.ClearField("flag_set")
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feature = f
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_rename_feature_in_toolchain(toolchain, "legacy_compile_flags",
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"default_compile_flags")
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break
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else:
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feature = _prepend_feature(toolchain)
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feature.enabled = True
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feature.name = "default_compile_flags"
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_add_flag_sets(feature, flag_sets)
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# Unfiltered cxx flags have to have their own special feature.
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# "unfiltered_compile_flags" is a well-known (by Bazel) feature name that is
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# excluded from nocopts filtering.
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if toolchain.unfiltered_cxx_flag:
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# If there already is a feature named unfiltered_compile_flags, the
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# crosstool is already migrated for unfiltered_compile_flags
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if _get_feature(toolchain, "unfiltered_compile_flags"):
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for f in toolchain.feature:
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if f.name == "unfiltered_compile_flags":
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for flag_set in f.flag_set:
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for flag_group in flag_set.flag_group:
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if flag_group.iterate_over == "unfiltered_compile_flags":
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flag_group.ClearField("iterate_over")
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flag_group.ClearField("expand_if_all_available")
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flag_group.ClearField("flag")
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flag_group.flag[:] = toolchain.unfiltered_cxx_flag
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else:
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if not _get_feature(toolchain, "user_compile_flags"):
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feature = toolchain.feature.add()
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feature.name = "user_compile_flags"
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feature.enabled = True
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flag_set = feature.flag_set.add()
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flag_set.action[:] = compile_actions(toolchain)
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flag_group = flag_set.flag_group.add()
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flag_group.expand_if_all_available[:] = ["user_compile_flags"]
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flag_group.iterate_over = "user_compile_flags"
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flag_group.flag[:] = ["%{user_compile_flags}"]
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if not _get_feature(toolchain, "sysroot"):
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sysroot_actions = compile_actions(toolchain) + link_actions(toolchain)
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sysroot_actions.remove("assemble")
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feature = toolchain.feature.add()
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feature.name = "sysroot"
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feature.enabled = True
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flag_set = feature.flag_set.add()
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flag_set.action[:] = sysroot_actions
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flag_group = flag_set.flag_group.add()
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flag_group.expand_if_all_available[:] = ["sysroot"]
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flag_group.flag[:] = ["--sysroot=%{sysroot}"]
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feature = toolchain.feature.add()
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feature.name = "unfiltered_compile_flags"
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feature.enabled = True
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flag_set = feature.flag_set.add()
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flag_set.action[:] = compile_actions(toolchain)
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flag_group = flag_set.flag_group.add()
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flag_group.flag[:] = toolchain.unfiltered_cxx_flag
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# clear fields
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toolchain.ClearField("debian_extra_requires")
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toolchain.ClearField("gcc_plugin_compiler_flag")
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toolchain.ClearField("ar_flag")
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toolchain.ClearField("ar_thin_archives_flag")
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toolchain.ClearField("gcc_plugin_header_directory")
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toolchain.ClearField("mao_plugin_header_directory")
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toolchain.ClearField("supports_normalizing_ar")
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toolchain.ClearField("supports_thin_archives")
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toolchain.ClearField("supports_incremental_linker")
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toolchain.ClearField("supports_dsym")
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toolchain.ClearField("supports_gold_linker")
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toolchain.ClearField("default_python_top")
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toolchain.ClearField("default_python_version")
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toolchain.ClearField("python_preload_swigdeps")
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toolchain.ClearField("needsPic")
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toolchain.ClearField("compilation_mode_flags")
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toolchain.ClearField("linking_mode_flags")
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toolchain.ClearField("unfiltered_cxx_flag")
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toolchain.ClearField("ld_embed_flag")
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toolchain.ClearField("objcopy_embed_flag")
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toolchain.ClearField("supports_start_end_lib")
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toolchain.ClearField("supports_interface_shared_objects")
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toolchain.ClearField("supports_fission")
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toolchain.ClearField("supports_embedded_runtimes")
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toolchain.ClearField("compiler_flag")
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toolchain.ClearField("cxx_flag")
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toolchain.ClearField("linker_flag")
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toolchain.ClearField("dynamic_library_linker_flag")
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toolchain.ClearField("static_runtimes_filegroup")
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toolchain.ClearField("dynamic_runtimes_filegroup")
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# Enable features that were previously enabled by Bazel
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default_features = [
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"dependency_file", "random_seed", "module_maps", "module_map_home_cwd",
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"header_module_compile", "include_paths", "pic", "preprocessor_define"
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]
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for feature_name in default_features:
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feature = _get_feature(toolchain, feature_name)
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if feature:
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feature.enabled = True
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def _find_tool_path(toolchain, tool_name):
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"""Returns the tool path of the tool with the given name."""
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for tool in toolchain.tool_path:
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if tool.name == tool_name:
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return tool.path
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return None
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def _add_flag_sets(feature, flag_sets):
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"""Add flag sets into a feature."""
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for flag_set in flag_sets:
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with_feature = flag_set[0]
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actions = flag_set[1]
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flags = flag_set[2]
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expand_if_all_available = flag_set[3]
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not_feature = None
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if len(flag_set) >= 5:
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not_feature = flag_set[4]
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flag_set = feature.flag_set.add()
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if with_feature is not None:
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flag_set.with_feature.add().feature[:] = [with_feature]
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if not_feature is not None:
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flag_set.with_feature.add().not_feature[:] = [not_feature]
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flag_set.action[:] = actions
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flag_group = flag_set.flag_group.add()
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flag_group.expand_if_all_available[:] = expand_if_all_available
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flag_group.flag[:] = flags
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return feature
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def _extract_legacy_compile_flag_sets_for(toolchain):
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"""Get flag sets for default_compile_flags feature."""
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result = []
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if toolchain.compiler_flag:
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result.append(
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[None, compile_actions(toolchain), toolchain.compiler_flag, []])
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# Migrate compiler_flag from compilation_mode_flags
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for cmf in toolchain.compilation_mode_flags:
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mode = crosstool_config_pb2.CompilationMode.Name(cmf.mode).lower()
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# coverage mode has been a noop since a while
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if mode == "coverage":
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continue
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if (cmf.compiler_flag or
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cmf.cxx_flag) and not _get_feature(toolchain, mode):
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feature = toolchain.feature.add()
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feature.name = mode
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if cmf.compiler_flag:
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result.append([mode, compile_actions(toolchain), cmf.compiler_flag, []])
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if toolchain.cxx_flag:
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result.append([None, ALL_CXX_COMPILE_ACTIONS, toolchain.cxx_flag, []])
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# Migrate compiler_flag/cxx_flag from compilation_mode_flags
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for cmf in toolchain.compilation_mode_flags:
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mode = crosstool_config_pb2.CompilationMode.Name(cmf.mode).lower()
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# coverage mode has been a noop since a while
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if mode == "coverage":
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continue
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if cmf.cxx_flag:
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result.append([mode, ALL_CXX_COMPILE_ACTIONS, cmf.cxx_flag, []])
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return result
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def _extract_legacy_link_flag_sets_for(toolchain):
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"""Get flag sets for default_link_flags feature."""
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result = []
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# Migrate linker_flag
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if toolchain.linker_flag:
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result.append([None, link_actions(toolchain), toolchain.linker_flag, []])
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# Migrate linker_flags from compilation_mode_flags
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for cmf in toolchain.compilation_mode_flags:
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mode = crosstool_config_pb2.CompilationMode.Name(cmf.mode).lower()
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# coverage mode has beed a noop since a while
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if mode == "coverage":
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continue
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if cmf.linker_flag and not _get_feature(toolchain, mode):
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feature = toolchain.feature.add()
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feature.name = mode
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if cmf.linker_flag:
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result.append([mode, link_actions(toolchain), cmf.linker_flag, []])
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# Migrate linker_flags from linking_mode_flags
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for lmf in toolchain.linking_mode_flags:
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mode = crosstool_config_pb2.LinkingMode.Name(lmf.mode)
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feature_name = LINKING_MODE_TO_FEATURE_NAME.get(mode)
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# if the feature is already there, we don't migrate, lmf is not used
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if _get_feature(toolchain, feature_name):
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continue
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if lmf.linker_flag:
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feature = toolchain.feature.add()
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feature.name = feature_name
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if mode == "DYNAMIC":
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result.append(
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[None, NODEPS_DYNAMIC_LIBRARY_LINK_ACTIONS, lmf.linker_flag, []])
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result.append([
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None,
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TRANSITIVE_DYNAMIC_LIBRARY_LINK_ACTIONS,
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lmf.linker_flag,
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[],
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"static_link_cpp_runtimes",
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])
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result.append([
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feature_name,
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executable_link_actions(toolchain), lmf.linker_flag, []
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])
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elif mode == "MOSTLY_STATIC":
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result.append(
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[feature_name,
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CC_LINK_EXECUTABLE, lmf.linker_flag, []])
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else:
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result.append(
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[feature_name,
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link_actions(toolchain), lmf.linker_flag, []])
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if toolchain.dynamic_library_linker_flag:
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result.append([
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None, DYNAMIC_LIBRARY_LINK_ACTIONS,
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toolchain.dynamic_library_linker_flag, []
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])
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if toolchain.test_only_linker_flag:
|
|
result.append([
|
|
None,
|
|
link_actions(toolchain), toolchain.test_only_linker_flag,
|
|
["is_cc_test"]
|
|
])
|
|
|
|
return result
|
|
|
|
|
|
def _prepend_feature(toolchain):
|
|
"""Create a new feature and make it be the first in the toolchain."""
|
|
features = toolchain.feature
|
|
toolchain.ClearField("feature")
|
|
new_feature = toolchain.feature.add()
|
|
toolchain.feature.extend(features)
|
|
return new_feature
|
|
|
|
|
|
def _get_feature(toolchain, name):
|
|
"""Returns feature with a given name or None."""
|
|
for feature in toolchain.feature:
|
|
if feature.name == name:
|
|
return feature
|
|
return None
|
|
|
|
|
|
def _migrate_expand_if_all_available(message):
|
|
"""Move expand_if_all_available field to flag_groups."""
|
|
for flag_set in message.flag_set:
|
|
if flag_set.expand_if_all_available:
|
|
for flag_group in flag_set.flag_group:
|
|
new_vars = (
|
|
flag_group.expand_if_all_available[:] +
|
|
flag_set.expand_if_all_available[:])
|
|
flag_group.expand_if_all_available[:] = new_vars
|
|
flag_set.ClearField("expand_if_all_available")
|
|
|
|
|
|
def _migrate_repeated_expands(message):
|
|
"""Replace repeated legacy fields with nesting."""
|
|
todo_queue = []
|
|
for flag_set in message.flag_set:
|
|
todo_queue.extend(flag_set.flag_group)
|
|
while todo_queue:
|
|
flag_group = todo_queue.pop()
|
|
todo_queue.extend(flag_group.flag_group)
|
|
if len(flag_group.expand_if_all_available) <= 1 and len(
|
|
flag_group.expand_if_none_available) <= 1:
|
|
continue
|
|
|
|
current_children = flag_group.flag_group
|
|
current_flags = flag_group.flag
|
|
flag_group.ClearField("flag_group")
|
|
flag_group.ClearField("flag")
|
|
|
|
new_flag_group = flag_group.flag_group.add()
|
|
new_flag_group.flag_group.extend(current_children)
|
|
new_flag_group.flag.extend(current_flags)
|
|
|
|
if len(flag_group.expand_if_all_available) > 1:
|
|
expands_to_move = flag_group.expand_if_all_available[1:]
|
|
flag_group.expand_if_all_available[:] = [
|
|
flag_group.expand_if_all_available[0]
|
|
]
|
|
new_flag_group.expand_if_all_available.extend(expands_to_move)
|
|
|
|
if len(flag_group.expand_if_none_available) > 1:
|
|
expands_to_move = flag_group.expand_if_none_available[1:]
|
|
flag_group.expand_if_none_available[:] = [
|
|
flag_group.expand_if_none_available[0]
|
|
]
|
|
new_flag_group.expand_if_none_available.extend(expands_to_move)
|
|
|
|
todo_queue.append(new_flag_group)
|
|
todo_queue.append(flag_group)
|
|
|
|
|
|
def _contains_dynamic_flags(toolchain):
|
|
for lmf in toolchain.linking_mode_flags:
|
|
mode = crosstool_config_pb2.LinkingMode.Name(lmf.mode)
|
|
if mode == "DYNAMIC":
|
|
return True
|
|
return False
|
|
|
|
|
|
def _rename_feature_in_toolchain(toolchain, from_name, to_name):
|
|
for f in toolchain.feature:
|
|
_rename_feature_in(f, from_name, to_name)
|
|
for a in toolchain.action_config:
|
|
_rename_feature_in(a, from_name, to_name)
|
|
|
|
|
|
def _rename_feature_in(msg, from_name, to_name):
|
|
if from_name in msg.implies:
|
|
msg.implies.remove(from_name)
|
|
for requires in msg.requires:
|
|
if from_name in requires.feature:
|
|
requires.feature.remove(from_name)
|
|
requires.feature.extend([to_name])
|
|
for flag_set in msg.flag_set:
|
|
for with_feature in flag_set.with_feature:
|
|
if from_name in with_feature.feature:
|
|
with_feature.feature.remove(from_name)
|
|
with_feature.feature.extend([to_name])
|
|
if from_name in with_feature.not_feature:
|
|
with_feature.not_feature.remove(from_name)
|
|
with_feature.not_feature.extend([to_name])
|
|
for env_set in msg.env_set:
|
|
for with_feature in env_set.with_feature:
|
|
if from_name in with_feature.feature:
|
|
with_feature.feature.remove(from_name)
|
|
with_feature.feature.extend([to_name])
|
|
if from_name in with_feature.not_feature:
|
|
with_feature.not_feature.remove(from_name)
|
|
with_feature.not_feature.extend([to_name])
|