-
Notifications
You must be signed in to change notification settings - Fork 4
/
Copy pathExternal-Project-module.html
383 lines (343 loc) · 15 KB
/
External-Project-module.html
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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
<!DOCTYPE html>
<html lang="en">
<head>
<base href=".">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>External Project module</title>
<link rel="stylesheet" href="assets/css/dark-frontend.css" type="text/css" title="dark">
<link rel="alternate stylesheet" href="assets/css/light-frontend.css" type="text/css" title="light">
<link rel="stylesheet" href="assets/css/bootstrap-toc.min.css" type="text/css">
<link rel="stylesheet" href="assets/css/jquery.mCustomScrollbar.min.css">
<link rel="stylesheet" href="assets/js/search/enable_search.css" type="text/css">
<link rel="stylesheet" href="assets/css/notes.css" type="text/css">
<link rel="stylesheet" href="assets/css/prism-tomorrow.css" type="text/css" title="dark">
<link rel="alternate stylesheet" href="assets/css/prism.css" type="text/css" title="light">
<script src="assets/js/mustache.min.js"></script>
<script src="assets/js/jquery.js"></script>
<script src="assets/js/bootstrap.js"></script>
<script src="assets/js/scrollspy.js"></script>
<script src="assets/js/typeahead.jquery.min.js"></script>
<script src="assets/js/search.js"></script>
<script src="assets/js/compare-versions.js"></script>
<script src="assets/js/jquery.mCustomScrollbar.concat.min.js"></script>
<script src="assets/js/bootstrap-toc.min.js"></script>
<script src="assets/js/jquery.touchSwipe.min.js"></script>
<script src="assets/js/anchor.min.js"></script>
<script src="assets/js/tag_filtering.js"></script>
<script src="assets/js/language_switching.js"></script>
<script src="assets/js/styleswitcher.js"></script>
<script src="assets/js/lines_around_headings.js"></script>
<script src="assets/js/prism-core.js"></script>
<script src="assets/js/prism-autoloader.js"></script>
<script src="assets/js/prism_autoloader_path_override.js"></script>
<script src="assets/js/prism-keep-markup.js"></script>
<script src="assets/js/trie.js"></script>
<link rel="icon" type="image/png" href="assets/images/favicon.png">
<link rel="shortcut icon" href="assets/images/favicon.png">
</head>
<body class="no-script
">
<script>
$('body').removeClass('no-script');
</script>
<nav class="navbar navbar-fixed-top navbar-default" id="topnav">
<div class="container-fluid">
<div class="navbar-right">
<a id="toc-toggle">
<span class="glyphicon glyphicon-menu-right"></span>
<span class="glyphicon glyphicon-menu-left"></span>
</a>
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-wrapper" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<span title="light mode switch" class="glyphicon glyphicon-sunglasses pull-right" id="lightmode-icon"></span>
<form class="navbar-form pull-right" id="navbar-search-form">
<div class="form-group has-feedback">
<input type="text" class="form-control input-sm" name="search" id="sidenav-lookup-field" placeholder="search" disabled>
<span class="glyphicon glyphicon-search form-control-feedback" id="search-mgn-glass"></span>
</div>
</form>
</div>
<div class="navbar-header">
<a id="sidenav-toggle">
<span class="glyphicon glyphicon-menu-right"></span>
<span class="glyphicon glyphicon-menu-left"></span>
</a>
<a id="home-link" href="index.html" class="hotdoc-navbar-brand">
<img src="assets/images/meson_logo.png" alt="Home">
</a>
</div>
<div class="navbar-collapse collapse" id="navbar-wrapper">
<ul class="nav navbar-nav" id="menu">
<li class="dropdown">
<a class="dropdown-toggle" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Modules <span class="caret"></span>
</a>
<ul class="dropdown-menu" id="modules-menu">
<li>
<a href="CMake-module.html">CMake</a>
</li>
<li>
<a href="Cuda-module.html">CUDA</a>
</li>
<li>
<a href="Dlang-module.html">Dlang</a>
</li>
<li>
<a href="External-Project-module.html">External Project</a>
</li>
<li>
<a href="Fs-module.html">Filesystem</a>
</li>
<li>
<a href="Gnome-module.html">GNOME</a>
</li>
<li>
<a href="Hotdoc-module.html">Hotdoc</a>
</li>
<li>
<a href="i18n-module.html">i18n</a>
</li>
<li>
<a href="Icestorm-module.html">Icestorm</a>
</li>
<li>
<a href="Java-module.html">Java</a>
</li>
<li>
<a href="Keyval-module.html">Keyval</a>
</li>
<li>
<a href="Pkgconfig-module.html">Pkgconfig</a>
</li>
<li>
<a href="Python-3-module.html">Python 3</a>
</li>
<li>
<a href="Python-module.html">Python</a>
</li>
<li>
<a href="Qt4-module.html">Qt4</a>
</li>
<li>
<a href="Qt5-module.html">Qt5</a>
</li>
<li>
<a href="Qt6-module.html">Qt6</a>
</li>
<li>
<a href="Rust-module.html">Rust</a>
</li>
<li>
<a href="Simd-module.html">Simd</a>
</li>
<li>
<a href="SourceSet-module.html">SourceSet</a>
</li>
<li>
<a href="Wayland-module.html">Wayland</a>
</li>
<li>
<a href="Windows-module.html">Windows</a>
</li>
</ul>
</li>
<li class="dropdown">
<a class="dropdown-toggle" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Quick References <span class="caret"></span>
</a>
<ul class="dropdown-menu" id="quick-refs-menu">
<li>
<a href="Reference-manual.html">Functions</a>
</li>
<li>
<a href="Build-options.html">Options</a>
</li>
<li>
<a href="Configuration.html">Configuration</a>
</li>
<li>
<a href="Dependencies.html">Dependencies</a>
</li>
<li>
<a href="Unit-tests.html">Tests</a>
</li>
<li>
<a href="Syntax.html">Syntax</a>
</li>
</ul>
</li>
</ul>
<div class="hidden-xs hidden-sm navbar-text navbar-center">
<p><b>The Meson Build System</b></p>
</div>
</div>
</div>
</nav>
<main>
<div data-extension="core" data-hotdoc-in-toplevel="True" data-hotdoc-project="Meson-documentation" data-hotdoc-ref="External-Project-module.html" class="page_container" id="page-wrapper">
<script src="assets/js/utils.js"></script>
<div class="panel panel-collapse oc-collapsed" id="sidenav" data-hotdoc-role="navigation">
<script src="assets/js/full-width.js"></script>
<div id="sitenav-wrapper">
<iframe src="hotdoc-sitemap.html" id="sitenav-frame"></iframe>
</div>
</div>
<div id="body">
<div id="main">
<div id="page-description" data-hotdoc-role="main">
<h1 id="external-project-module">External Project module</h1>
<p><strong>Note</strong>: the functionality of this module is governed by <a href="Mixing-build-systems.html">Meson's
rules on mixing build systems</a>.</p>
<p><em>This is an experimental module, API could change.</em></p>
<p><em>Added 0.56.0</em></p>
<p>This module allows building code that uses build systems other than
Meson. This module is intended to be used to build Autotools
subprojects as fallback if the dependency couldn't be found on the
system (e.g. too old distro version).</p>
<p>The project will be compiled out-of-tree inside Meson's build
directory. The project will also be installed inside Meson's build
directory using make's
<a href="https://www.gnu.org/prep/standards/html_node/DESTDIR.html"><code>DESTDIR</code></a>
feature. During project installation step, that DESTDIR will be copied
verbatim into the desired location.</p>
<p>External subprojects can use libraries built by Meson (main project,
or other subprojects) using pkg-config, thanks to <code>*-uninstalled.pc</code>
files generated by <a href="Pkgconfig-module.html"><code>pkg.generate()</code></a>.</p>
<p>External build system requirements:</p>
<ul>
<li>Must support out-of-tree build. The configure script will be invoked with the
current workdir inside Meson's build directory and not subproject's top source
directory.</li>
<li>Configure script must generate a <code>Makefile</code> in the current workdir.</li>
<li>Configure script must take common directories like prefix, libdir, etc, as
command line arguments.</li>
<li>Configure script must support common environment variable like CFLAGS, CC, etc.</li>
<li>Compilation step must detect when a reconfigure is needed, and do it
transparently.</li>
</ul>
<p>Known limitations:</p>
<ul>
<li>Executables from external projects cannot be used uninstalled, because they
would need its libraries to be installed in the final location. This is why
there is no <code>find_program()</code> method.</li>
<li>The configure script must generate a <code>Makefile</code>, other build systems are not
yet supported.</li>
<li>When cross compiling, if <code>PKG_CONFIG_SYSROOT_DIR</code> is set in environment or
<code>sys_root</code> in the cross file properties, the external subproject will not be
able to find dependencies built by Meson using pkg-config. The reason is
pkg-config and pkgconf both prepend the sysroot path to <code>-I</code> and <code>-L</code> arguments
from <code>-uninstalled.pc</code> files. This is arguably a bug that could be fixed in
future version of pkg-config/pkgconf.</li>
</ul>
<p><em>Since 1.7.0</em> [Meson devenv][Commands.md#devenv] setup <code>PATH</code> and
<code>LD_LIBRARY_PATH</code> to be able to run programs.</p>
<h2 id="functions">Functions</h2>
<h3 id="add_project"><code>add_project()</code></h3>
<p>This function should be called at the root directory of a project
using another build system. Usually in a <code>meson.build</code> file placed in
the top directory of a subproject, but could be also in any subdir.</p>
<p>Its first positional argument is the name of the configure script to
be executed (e.g. <code>configure</code>), that file must be in the current
directory and executable. Note that if a bootstrap script is required
(e.g. <code>autogen.sh</code> when building from git instead of tarball), it can
be done using <code>run_command()</code> before calling <code>add_project()</code> method.</p>
<p><em>Since 0.60.0</em> If the first positional argument is <code>'waf'</code>, special treatment
is done for the <a href="https://waf.io/">waf</a> build system. The waf executable must be
found either in the current directory, or in system <code>PATH</code>.</p>
<p>Keyword arguments:</p>
<ul>
<li>
<code>configure_options</code>: An array of strings to be passed as arguments to the
configure script. Some special tags will be replaced by Meson before passing
them to the configure script: <code>@PREFIX@</code>, <code>@LIBDIR@</code> and <code>@INCLUDEDIR@</code>.
Note that <code>libdir</code> and <code>includedir</code> paths are relative to <code>prefix</code> in Meson
but some configure scripts requires absolute path, in that case they can be
passed as <code>'--libdir=@PREFIX@/@LIBDIR@'</code>. <em>Since 0.57.0</em> default arguments are
added in case some tags are not found in <code>configure_options</code>:
<code>'--prefix=@PREFIX@'</code>, <code>'--libdir=@PREFIX@/@LIBDIR@'</code>, and
<code>'--includedir=@PREFIX@/@INCLUDEDIR@'</code>. It was previously considered a fatal
error to not specify them. <em>Since 1.7.0</em> <code>@BINDIR@</code> and <code>'--bindir=@PREFIX@/@BINDIR@'</code>
default argument have been added.</li>
<li>
<code>cross_configure_options</code>: Extra options appended to <code>configure_options</code> only
when cross compiling. special tag <code>@HOST@</code> will be replaced by
<code>'{}-{}-{}'.format(host_machine.cpu_family(), build_machine.system(), host_machine.system()</code>.
If omitted it defaults to <code>['--host=@HOST@']</code>.</li>
<li>
<code>verbose</code>: If set to <code>true</code> the output of sub-commands ran to configure, build
and install the project will be printed onto Meson's stdout.</li>
<li>
<code>env</code> : environment variables to set, such as <code>['NAME1=value1', 'NAME2=value2']</code>,
a dictionary, or an <a href="Reference-manual_returned_env.html"><ins><code>env</code></ins></a> object.</li>
<li>
<code>depends</code> : <em>Since 0.63.0</em> Specifies that this project depends on the specified
target(s) that must be built before running <code>make</code> to build this external
project. This should be used for example when the external project links to a
Meson <code>library()</code> that the <code>configure</code> script will find using the
<code>-uninstalled.pc</code> pkg-config file generated by Meson.</li>
</ul>
<p>Returns an <a href="External-Project-module.html#ExternalProject_object"><code>ExternalProject</code></a> object</p>
<h2 id="externalproject-object">
<code>ExternalProject</code> object</h2>
<h3 id="methods">Methods</h3>
<h4 id="dependencylibname"><code>dependency(libname)</code></h4>
<p>Return a dependency object that can be used to build targets against a library
from the external project.</p>
<p>Keyword arguments:</p>
<ul>
<li>
<code>subdir</code> path relative to <code>includedir</code> to be added to the header search path.</li>
</ul>
<h2 id="example-mesonbuild-file-for-a-subproject">Example <code>meson.build</code> file for a subproject</h2>
<pre><code class="language-meson">project('My Autotools Project', 'c',
meson_version : '>=0.56.0',
)
mod = import('unstable-external_project')
p = mod.add_project('configure',
configure_options : ['--prefix=@PREFIX@',
'--libdir=@LIBDIR@',
'--incdir=@INCLUDEDIR@',
'--enable-foo',
],
)
mylib_dep = p.dependency('mylib')
meson.override_dependency('mylib', mylib_dep)
</code></pre>
<h2 id="using-wrap-file">Using wrap file</h2>
<p>Most of the time the project will be built as a subproject, and
fetched using a <code>.wrap</code> file. In that case the simple <code>meson.build</code>
file needed to build the subproject can be provided by adding
<code>patch_directory=mysubproject</code> line in the wrap file, and place the
build definition file at
<code>subprojects/packagefiles/mysubproject/meson.build</code>.</p>
</div>
</div>
<div id="search_results">
<p>The results of the search are</p>
</div>
<div id="footer">
<hr>
<div class="license-description">
Website licensing information are available on the <a href="legal.html">Legal</a> page.
</div>
</div>
</div>
<div id="toc-column">
<div class="edit-button">
<a href="https://github.com/mesonbuild/meson/edit/master/docs/markdown/External-Project-module.md" data-hotdoc-role="edit-button">Edit on GitHub</a>
</div>
<div id="toc-wrapper">
<nav id="toc"></nav>
</div>
</div>
</div>
</main>
<script src="assets/js/navbar_offset_scroller.js"></script>
</body>
</html>