62 lines
1.8 KiB
Python
62 lines
1.8 KiB
Python
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# Copyright 2021 the V8 project authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Build rules to choose the v8 target architecture."""
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load("@bazel_skylib//lib:selects.bzl", "selects")
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V8CpuTypeInfo = provider(
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doc = "A singleton provider that specifies the V8 target CPU type",
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fields = {
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"value": "The V8 Target CPU selected.",
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},
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)
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def _host_target_cpu_impl(ctx):
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allowed_values = ["arm", "arm64", "ia32", "x64", "none"]
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cpu_type = ctx.build_setting_value
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if cpu_type in allowed_values:
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return V8CpuTypeInfo(value = cpu_type)
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else:
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fail("Error setting " + str(ctx.label) + ": invalid v8 target cpu '" +
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cpu_type + "'. Allowed values are " + str(allowed_values))
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v8_target_cpu = rule(
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implementation = _host_target_cpu_impl,
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build_setting = config.string(flag = True),
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doc = "CPU that V8 will generate code for.",
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)
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def v8_configure_target_cpu(name, matching_configs):
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selects.config_setting_group(
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name = "is_" + name,
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match_any = matching_configs,
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)
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# If v8_target_cpu flag is set to 'name'
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native.config_setting(
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name = "v8_host_target_is_" + name,
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flag_values = {
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":v8_target_cpu": name,
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},
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)
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# Default target if no v8_host_target flag is set.
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selects.config_setting_group(
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name = "v8_target_is_" + name,
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match_all = [
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":v8_host_target_is_none",
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":is_" + name,
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],
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)
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# Select either the default target or the flag.
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selects.config_setting_group(
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name = "v8_target_" + name,
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match_any = [
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":v8_host_target_is_" + name,
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":v8_target_is_" + name,
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],
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)
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