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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
// Copyright 2017 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.
package com.google.devtools.build.lib.bazel.rules.cpp;
import static com.google.devtools.build.lib.packages.Attribute.attr;
import static com.google.devtools.build.lib.packages.BuildType.LABEL;
import com.google.devtools.build.lib.analysis.BaseRuleClasses;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
import com.google.devtools.build.lib.packages.RuleClass;
import com.google.devtools.build.lib.packages.RuleClass.Builder;
import com.google.devtools.build.lib.rules.cpp.CcImportRule;
import com.google.devtools.build.lib.rules.cpp.CcToolchain;
import com.google.devtools.build.lib.rules.cpp.CppConfiguration;
import com.google.devtools.build.lib.rules.cpp.CppRuleClasses;
/** Rule definition for the cc_import rule. */
public final class BazelCcImportRule implements RuleDefinition {
@Override
public RuleClass build(Builder builder, RuleDefinitionEnvironment env) {
return builder
.requiresConfigurationFragments(CppConfiguration.class)
.add(
attr(CcToolchain.CC_TOOLCHAIN_DEFAULT_ATTRIBUTE_NAME, LABEL)
.value(CppRuleClasses.ccToolchainAttribute(env)))
.add(
attr(CcToolchain.CC_TOOLCHAIN_TYPE_ATTRIBUTE_NAME, LABEL)
.value(CppRuleClasses.ccToolchainTypeAttribute(env)))
.add(attr(":stl", LABEL).value(BazelCppRuleClasses.STL))
.build();
}
@Override
public Metadata getMetadata() {
return RuleDefinition.Metadata.builder()
.name("cc_import")
.ancestors(BaseRuleClasses.BaseRule.class, CcImportRule.class)
.factoryClass(BazelCcImport.class)
.build();
}
}
/*<!-- #BLAZE_RULE (NAME = cc_import, TYPE = LIBRARY, FAMILY = C / C++) -->
<p>
<code>cc_import</code> rules allows users to import precompiled C/C++ libraries.
</p>
<p>
The following are the typical use cases: <br/>
1. Linking a static library
<pre class="code">
cc_import(
name = "mylib",
hdrs = ["mylib.h"],
static_library = "libmylib.a",
# If alwayslink is turned on,
# libmylib.a will be forcely linked into any binary that depends on it.
# alwayslink = 1,
)
</pre>
2. Linking a shared library (Unix)
<pre class="code">
cc_import(
name = "mylib",
hdrs = ["mylib.h"],
shared_library = "libmylib.so",
)
</pre>
3. Linking a shared library with interface library (Windows)
<pre class="code">
cc_import(
name = "mylib",
hdrs = ["mylib.h"],
# mylib.lib is a import library for mylib.dll which will be passed to linker
interface_library = "mylib.lib",
# mylib.dll will be available for runtime
shared_library = "mylib.dll",
)
</pre>
4. Linking a shared library with <code>system_provided=1</code> (Windows)
<pre class="code">
cc_import(
name = "mylib",
hdrs = ["mylib.h"],
# mylib.lib is an import library for mylib.dll which will be passed to linker
interface_library = "mylib.lib",
# mylib.dll is provided by system environment, for example it can be found in PATH.
# This indicates that Bazel is not responsible for making mylib.dll available.
system_provided = 1,
)
</pre>
5. Linking to static or shared library <br/>
On Unix:
<pre class="code">
cc_import(
name = "mylib",
hdrs = ["mylib.h"],
static_library = "libmylib.a",
shared_library = "libmylib.so",
)
# first will link to libmylib.a
cc_binary(
name = "first",
srcs = ["first.cc"],
deps = [":mylib"],
linkstatic = 1, # default value
)
# second will link to libmylib.so
cc_binary(
name = "second",
srcs = ["second.cc"],
deps = [":mylib"],
linkstatic = 0,
)
</pre>
On Windows:
<pre class="code">
cc_import(
name = "mylib",
hdrs = ["mylib.h"],
static_library = "libmylib.lib", # A normal static library
interface_library = "mylib.lib", # An import library for mylib.dll
shared_library = "mylib.dll",
)
# first will link to libmylib.lib
cc_binary(
name = "first",
srcs = ["first.cc"],
deps = [":mylib"],
linkstatic = 1, # default value
)
# second will link to mylib.dll through mylib.lib
cc_binary(
name = "second",
srcs = ["second.cc"],
deps = [":mylib"],
linkstatic = 0,
)
</pre>
</p>
<!-- #END_BLAZE_RULE -->*/
|
