docs/meson.html - third_party/mesa - Git at Google

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 <html lang="en">
 <head>
   <meta http-equiv="content-type" content="text/html; charset=utf-8">
   <title>Compilation and Installation using Meson</title>
   <link rel="stylesheet" type="text/css" href="mesa.css">
 </head>
 <body>

 <div class="header">
   <h1>The Mesa 3D Graphics Library</h1>
 </div>

 <iframe src="contents.html"></iframe>
 <div class="content">

 <h1>Compilation and Installation using Meson</h1>

 <h2 id="basic">1. Basic Usage</h2>

 <p><strong>The Meson build system for Mesa is still under active development,
 and should not be used in production environments.</strong></p>

 <p>The meson build is currently only tested on linux, and is known to not work
 on macOS, Windows, and haiku. This will be fixed.</p>

 <p>
 The meson program is used to configure the source directory and generates
 either a ninja build file or Visual Studio® build files. The latter must
 be enabled via the --backend switch, as ninja is the default backend on all
 operating systems. Meson only supports out-of-tree builds, and must be passed a
 directory to put built and generated sources into. We'll call that directory
 "build" for examples.
 </p>

 <pre>
     meson build/
 </pre>

 <p>
 To see a description of your options you can run <code>meson configure</code>
 along with a build directory to view the selected options for. This will show
 your meson global arguments and project arguments, along with their defaults
 and your local settings.

 Moes does not currently support listing options before configure a build
 directory, but this feature is being discussed upstream.
 </p>

 <pre>
     meson configure build/
 </pre>

 <p>
 With additional arguments <code>meson configure</code> is used to change
 options on already configured build directory. All options passed to this
 command are in the form -D "command"="value".
 </p>

 <pre>
     meson configure build/ -Dprefix=/tmp/install -Dglx=true
 </pre>

 <p>
 Once you've run the initial <code>meson</code> command successfully you can use
 your configured backend to build the project. With ninja, the -C option can be
 be used to point at a directory to build.
 </p>

 <pre>
     ninja -C build/
 </pre>

 <p>
 Without arguments, it will produce libGL.so and/or several other libraries
 depending on the options you have chosen. Later, if you want to rebuild for a
 different configuration, you should run <code>ninja clean</code> before
 changing the configuration, or create a new out of tree build directory for
 each configuration you want to build.

 http://mesonbuild.com/Using-multiple-build-directories.html
 </p>

 <dt><code>Environment Variables</code></dt>
 <dd><p>Meson supports the standard CC and CXX envrionment variables for
 changing the default compiler, and CFLAGS, CXXFLAGS, and LDFLAGS for setting
 options to the compiler and linker.

 The default compilers depends on your operating system. Meson supports most of
 the popular compilers, a complete list is available
 <a href="http://mesonbuild.com/Reference-tables.html#compiler-ids">here</a>.

 These arguments are consumed and stored by meson when it is initialized or
 re-initialized. Therefore passing them to meson configure will not do anything,
 and passing them to ninja will only do something if ninja decides to
 re-initialze meson, for example, if a meson.build file has been changed.
 Changing these variables will not cause all targets to be rebuilt, so running
 ninja clean is recomended when changing CFLAGS or CXXFLAGS. meson will never
 change compiler in a configured build directory.
 </p>

 <pre>
     CC=clang CXX=clang++ meson build-clang
     ninja -C build-clang
     ninja -C build-clang clean
     touch meson.build
     CFLAGS=-Wno-typedef-redefinition ninja -C build-clang
 </pre>

 <p>Meson also honors DESTDIR for installs</p>
 </dd>


 <dt><code>LLVM</code></dt>
 <dd><p>Meson includes upstream logic to wrap llvm-config using it's standard
 dependncy interface. It will search $PATH (or %PATH% on windows) for
 llvm-config, so using an LLVM from a non-standard path is as easy as
 <code>PATH=/path/with/llvm-config:$PATH meson build</code>.
 </p></dd>
 </dl>

 <dt><code>PKG_CONFIG_PATH</code></dt>
 <dd><p>The
 <code>pkg-config</code> utility is a hard requirement for configuring and
 building Mesa on Linux and *BSD. It is used to search for external libraries
 on the system. This environment variable is used to control the search
 path for <code>pkg-config</code>. For instance, setting
 <code>PKG_CONFIG_PATH=/usr/X11R6/lib/pkgconfig</code> will search for
 package metadata in <code>/usr/X11R6</code> before the standard
 directories.</p>
 </dd>
 </dl>

 <p>
 One of the oddities of meson is that some options are different when passed to
 the <code>meson</code> than to <code>meson configure</code>. These options are
 passed as --option=foo to <code>meson</code>, but -Doption=foo to <code>meson
 configure</code>. Mesa defined options are always passed as -Doption=foo.
 <p>

 <p>For those coming from autotools be aware of the following:</p>

 <dl>
 <dt><code>--buildtype/-Dbuildtype</code></dt>
 <dd><p>This option will set the compiler debug/optimisation levels to aid
 debugging the Mesa libraries.</p>

 <p>Note that in meson this defaults to "debugoptimized", and  not setting it to
 "release" will yield non-optimal performance and binary size. Not using "debug"
 may interfer with debbugging as some code and validation will be optimized
 away.
 </p>

 <p> For those wishing to pass their own -O option, use the "plain" buildtype,
 which cuases meson to inject no additional compiler arguments, only those in
 the C/CXXFLAGS and those that mesa itself defines.</p>
 </dd>
 </dl>

 <dl>
 <dt><code>-Db_ndebug</code></dt>
 <dd><p>This option controls assertions in meson projects. When set to false
 (the default) assertions are enabled, when set to true they are disabled. This
 is unrelated to the <code>buildtype</code>; setting the latter to
 <code>release</code> will not turn off assertions.
 </p>
 </dd>
 </dl>
	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<html lang="en">
	<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8">
	<title>Compilation and Installation using Meson</title>
	<link rel="stylesheet" type="text/css" href="mesa.css">
	</head>
	<body>

	<div class="header">
	<h1>The Mesa 3D Graphics Library</h1>
	</div>

	<iframe src="contents.html"></iframe>
	<div class="content">

	<h1>Compilation and Installation using Meson</h1>

	<h2 id="basic">1. Basic Usage</h2>

	<p><strong>The Meson build system for Mesa is still under active development,
	and should not be used in production environments.</strong></p>

	<p>The meson build is currently only tested on linux, and is known to not work
	on macOS, Windows, and haiku. This will be fixed.</p>

	<p>
	The meson program is used to configure the source directory and generates
	either a ninja build file or Visual Studio® build files. The latter must
	be enabled via the --backend switch, as ninja is the default backend on all
	operating systems. Meson only supports out-of-tree builds, and must be passed a
	directory to put built and generated sources into. We'll call that directory
	"build" for examples.
	</p>

	<pre>
	meson build/
	</pre>

	<p>
	To see a description of your options you can run <code>meson configure</code>
	along with a build directory to view the selected options for. This will show
	your meson global arguments and project arguments, along with their defaults
	and your local settings.

	Moes does not currently support listing options before configure a build
	directory, but this feature is being discussed upstream.
	</p>

	<pre>
	meson configure build/
	</pre>

	<p>
	With additional arguments <code>meson configure</code> is used to change
	options on already configured build directory. All options passed to this
	command are in the form -D "command"="value".
	</p>

	<pre>
	meson configure build/ -Dprefix=/tmp/install -Dglx=true
	</pre>

	<p>
	Once you've run the initial <code>meson</code> command successfully you can use
	your configured backend to build the project. With ninja, the -C option can be
	be used to point at a directory to build.
	</p>

	<pre>
	ninja -C build/
	</pre>

	<p>
	Without arguments, it will produce libGL.so and/or several other libraries
	depending on the options you have chosen. Later, if you want to rebuild for a
	different configuration, you should run <code>ninja clean</code> before
	changing the configuration, or create a new out of tree build directory for
	each configuration you want to build.

	http://mesonbuild.com/Using-multiple-build-directories.html
	</p>

	<dt><code>Environment Variables</code></dt>
	<dd><p>Meson supports the standard CC and CXX envrionment variables for
	changing the default compiler, and CFLAGS, CXXFLAGS, and LDFLAGS for setting
	options to the compiler and linker.

	The default compilers depends on your operating system. Meson supports most of
	the popular compilers, a complete list is available
	<a href="http://mesonbuild.com/Reference-tables.html#compiler-ids">here</a>.

	These arguments are consumed and stored by meson when it is initialized or
	re-initialized. Therefore passing them to meson configure will not do anything,
	and passing them to ninja will only do something if ninja decides to
	re-initialze meson, for example, if a meson.build file has been changed.
	Changing these variables will not cause all targets to be rebuilt, so running
	ninja clean is recomended when changing CFLAGS or CXXFLAGS. meson will never
	change compiler in a configured build directory.
	</p>

	<pre>
	CC=clang CXX=clang++ meson build-clang
	ninja -C build-clang
	ninja -C build-clang clean
	touch meson.build
	CFLAGS=-Wno-typedef-redefinition ninja -C build-clang
	</pre>

	<p>Meson also honors DESTDIR for installs</p>
	</dd>


	<dt><code>LLVM</code></dt>
	<dd><p>Meson includes upstream logic to wrap llvm-config using it's standard
	dependncy interface. It will search $PATH (or %PATH% on windows) for
	llvm-config, so using an LLVM from a non-standard path is as easy as
	<code>PATH=/path/with/llvm-config:$PATH meson build</code>.
	</p></dd>
	</dl>

	<dt><code>PKG_CONFIG_PATH</code></dt>
	<dd><p>The
	<code>pkg-config</code> utility is a hard requirement for configuring and
	building Mesa on Linux and *BSD. It is used to search for external libraries
	on the system. This environment variable is used to control the search
	path for <code>pkg-config</code>. For instance, setting
	<code>PKG_CONFIG_PATH=/usr/X11R6/lib/pkgconfig</code> will search for
	package metadata in <code>/usr/X11R6</code> before the standard
	directories.</p>
	</dd>
	</dl>

	<p>
	One of the oddities of meson is that some options are different when passed to
	the <code>meson</code> than to <code>meson configure</code>. These options are
	passed as --option=foo to <code>meson</code>, but -Doption=foo to <code>meson
	configure</code>. Mesa defined options are always passed as -Doption=foo.
	<p>

	<p>For those coming from autotools be aware of the following:</p>

	<dl>
	<dt><code>--buildtype/-Dbuildtype</code></dt>
	<dd><p>This option will set the compiler debug/optimisation levels to aid
	debugging the Mesa libraries.</p>

	<p>Note that in meson this defaults to "debugoptimized", and not setting it to
	"release" will yield non-optimal performance and binary size. Not using "debug"
	may interfer with debbugging as some code and validation will be optimized
	away.
	</p>

	<p> For those wishing to pass their own -O option, use the "plain" buildtype,
	which cuases meson to inject no additional compiler arguments, only those in
	the C/CXXFLAGS and those that mesa itself defines.</p>
	</dd>
	</dl>

	<dl>
	<dt><code>-Db_ndebug</code></dt>
	<dd><p>This option controls assertions in meson projects. When set to false
	(the default) assertions are enabled, when set to true they are disabled. This
	is unrelated to the <code>buildtype</code>; setting the latter to
	<code>release</code> will not turn off assertions.
	</p>
	</dd>
	</dl>