1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
# Copyright 2016 The Bazel Go Rules 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.
"""
Toolchain rules used by go.
"""
load("//go/private:platforms.bzl", "PLATFORMS")
load("//go/private:providers.bzl", "GoSDK")
load("//go/private/actions:archive.bzl", "emit_archive")
load("//go/private/actions:binary.bzl", "emit_binary")
load("//go/private/actions:link.bzl", "emit_link")
load("//go/private/actions:stdlib.bzl", "emit_stdlib")
GO_TOOLCHAIN = "@io_bazel_rules_go//go:toolchain"
def _go_toolchain_impl(ctx):
sdk = ctx.attr.sdk[GoSDK]
cross_compile = ctx.attr.goos != sdk.goos or ctx.attr.goarch != sdk.goarch
return [platform_common.ToolchainInfo(
# Public fields
name = ctx.label.name,
cross_compile = cross_compile,
default_goos = ctx.attr.goos,
default_goarch = ctx.attr.goarch,
actions = struct(
archive = emit_archive,
binary = emit_binary,
link = emit_link,
stdlib = emit_stdlib,
),
flags = struct(
compile = (),
link = ctx.attr.link_flags,
link_cgo = ctx.attr.cgo_link_flags,
),
sdk = sdk,
# Internal fields -- may be read by emit functions.
_builder = ctx.executable.builder,
)]
go_toolchain = rule(
_go_toolchain_impl,
attrs = {
# Minimum requirements to specify a toolchain
"builder": attr.label(
mandatory = True,
cfg = "exec",
executable = True,
doc = "Tool used to execute most Go actions",
),
"goos": attr.string(
mandatory = True,
doc = "Default target OS",
),
"goarch": attr.string(
mandatory = True,
doc = "Default target architecture",
),
"sdk": attr.label(
mandatory = True,
providers = [GoSDK],
cfg = "exec",
doc = "The SDK this toolchain is based on",
),
# Optional extras to a toolchain
"link_flags": attr.string_list(
doc = "Flags passed to the Go internal linker",
),
"cgo_link_flags": attr.string_list(
doc = "Flags passed to the external linker (if it is used)",
),
},
doc = "Defines a Go toolchain based on an SDK",
provides = [platform_common.ToolchainInfo],
)
def declare_go_toolchains(host_goos, sdk, builder):
"""Declares go_toolchain targets for each platform."""
for p in PLATFORMS:
if p.cgo:
# Don't declare separate toolchains for cgo_on / cgo_off.
# This is controlled by the cgo_context_data dependency of
# go_context_data, which is configured using constraint_values.
continue
link_flags = []
cgo_link_flags = []
if host_goos == "darwin":
cgo_link_flags.extend(["-shared", "-Wl,-all_load"])
if host_goos == "linux":
cgo_link_flags.append("-Wl,-whole-archive")
go_toolchain(
name = "go_" + p.name + "-impl",
goos = p.goos,
goarch = p.goarch,
sdk = sdk,
builder = builder,
link_flags = link_flags,
cgo_link_flags = cgo_link_flags,
tags = ["manual"],
visibility = ["//visibility:public"],
)
def declare_bazel_toolchains(host_goos, host_goarch, toolchain_prefix, sdk_version_setting):
"""Declares toolchain targets for each platform."""
for p in PLATFORMS:
if p.cgo:
# Don't declare separate toolchains for cgo_on / cgo_off.
# This is controlled by the cgo_context_data dependency of
# go_context_data, which is configured using constraint_values.
continue
cgo_constraints = (
"@io_bazel_rules_go//go/toolchain:cgo_off",
"@io_bazel_rules_go//go/toolchain:cgo_on",
)
constraints = [c for c in p.constraints if c not in cgo_constraints]
native.toolchain(
# keep in sync with generate_toolchain_names
name = "go_" + p.name,
toolchain_type = GO_TOOLCHAIN,
exec_compatible_with = [
"@io_bazel_rules_go//go/toolchain:" + host_goos,
"@io_bazel_rules_go//go/toolchain:" + host_goarch,
],
target_compatible_with = constraints,
target_settings = [sdk_version_setting],
toolchain = toolchain_prefix + ":go_" + p.name + "-impl",
)
|
