1# Copyright 2019 The Bazel Authors. All rights reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7# http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15load(
16 "//go/private:platforms.bzl",
17 "GOARCH_CONSTRAINTS",
18 "GOOS_CONSTRAINTS",
19 "PLATFORMS",
20)
21
22def declare_constraints():
23 """Generates constraint_values and platform targets for valid platforms.
24
25 Each constraint_value corresponds to a valid goos or goarch.
26 The goos and goarch values belong to the constraint_settings
27 @platforms//os:os and @platforms//cpu:cpu, respectively.
28 To avoid redundancy, if there is an equivalent value in @platforms,
29 we define an alias here instead of another constraint_value.
30
31 Each platform defined here selects a goos and goarch constraint value.
32 These platforms may be used with --platforms for cross-compilation,
33 though users may create their own platforms (and
34 @bazel_tools//platforms:default_platform will be used most of the time).
35 """
36 for goos, constraint in GOOS_CONSTRAINTS.items():
37 if constraint.startswith("@io_bazel_rules_go//go/toolchain:"):
38 native.constraint_value(
39 name = goos,
40 constraint_setting = "@platforms//os:os",
41 )
42 else:
43 native.alias(
44 name = goos,
45 actual = constraint,
46 )
47
48 for goarch, constraint in GOARCH_CONSTRAINTS.items():
49 if constraint.startswith("@io_bazel_rules_go//go/toolchain:"):
50 native.constraint_value(
51 name = goarch,
52 constraint_setting = "@platforms//cpu:cpu",
53 )
54 else:
55 native.alias(
56 name = goarch,
57 actual = constraint,
58 )
59
60 native.constraint_setting(
61 name = "cgo_constraint",
62 )
63
64 native.constraint_value(
65 name = "cgo_on",
66 constraint_setting = ":cgo_constraint",
67 )
68
69 native.constraint_value(
70 name = "cgo_off",
71 constraint_setting = ":cgo_constraint",
72 )
73
74 for p in PLATFORMS:
75 native.platform(
76 name = p.name,
77 constraint_values = p.constraints,
78 )
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