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toolchains.bzl
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toolchains.bzl
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# Copyright 2019 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.
load(
"@io_bazel_rules_go//go/private:platforms.bzl",
"GOARCH_CONSTRAINTS",
"GOOS_CONSTRAINTS",
"PLATFORMS",
)
def declare_constraints():
"""Generates constraint_values and platform targets for valid platforms.
Each constraint_value corresponds to a valid goos or goarch.
The goos and goarch values belong to the constraint_settings
@platforms//os:os and @platforms//cpu:cpu, respectively.
To avoid redundancy, if there is an equivalent value in @platforms,
we define an alias here instead of another constraint_value.
Each platform defined here selects a goos and goarch constraint value.
These platforms may be used with --platforms for cross-compilation,
though users may create their own platforms (and
@bazel_tools//platforms:default_platform will be used most of the time).
"""
for goos, constraint in GOOS_CONSTRAINTS.items():
if constraint.startswith("@io_bazel_rules_go//go/toolchain:"):
native.constraint_value(
name = goos,
constraint_setting = "@platforms//os:os",
)
else:
native.alias(
name = goos,
actual = constraint,
)
for goarch, constraint in GOARCH_CONSTRAINTS.items():
if constraint.startswith("@io_bazel_rules_go//go/toolchain:"):
native.constraint_value(
name = goarch,
constraint_setting = "@platforms//cpu:cpu",
)
else:
native.alias(
name = goarch,
actual = constraint,
)
native.constraint_setting(
name = "cgo_constraint",
)
native.constraint_value(
name = "cgo_on",
constraint_setting = ":cgo_constraint",
)
native.constraint_value(
name = "cgo_off",
constraint_setting = ":cgo_constraint",
)
for p in PLATFORMS:
native.platform(
name = p.name,
constraint_values = p.constraints,
)