2aad12b2af
Meson is pretty well tested and works in most configurations now, so we
can remove the warning about it being unsuited for actual use.
It's also worth documenting that meson 0.42.0 or greater is required.
v2: - Minor rewording of supported platforms as suggested by Emil
- Add two missing tags as reported by xmllint --html
Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com> (v1)
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> (v1)
179 lines
6.1 KiB
HTML
179 lines
6.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Compilation and Installation using Meson</title>
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<link rel="stylesheet" type="text/css" href="mesa.css">
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</head>
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<body>
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<div class="header">
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<h1>The Mesa 3D Graphics Library</h1>
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</div>
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<iframe src="contents.html"></iframe>
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<div class="content">
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<h1>Compilation and Installation using Meson</h1>
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<h2 id="basic">1. Basic Usage</h2>
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<p><strong>The Meson build system is generally considered stable and ready
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for production</strong></p>
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<p>The meson build is tested on on Linux, macOS, Cygwin and Haiku, it should
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work on FreeBSD, DragonflyBSD, NetBSD, and OpenBSD.</p>
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<p><strong>Mesa requires Meson >= 0.42.0 to build in general.</strong>
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Additionaly, to build the Clover OpenCL state tracker or the OpenSWR driver
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meson 0.44.0 or greater is required.
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Some older versions of meson do not check that they are too old and will error
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out in odd ways.
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</p>
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<p>
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The meson program is used to configure the source directory and generates
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either a ninja build file or Visual Studio® build files. The latter must
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be enabled via the --backend switch, as ninja is the default backend on all
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operating systems. Meson only supports out-of-tree builds, and must be passed a
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directory to put built and generated sources into. We'll call that directory
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"build" for examples.
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</p>
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<pre>
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meson build/
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</pre>
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<p>
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To see a description of your options you can run <code>meson configure</code>
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along with a build directory to view the selected options for. This will show
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your meson global arguments and project arguments, along with their defaults
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and your local settings.
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Moes does not currently support listing options before configure a build
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directory, but this feature is being discussed upstream.
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</p>
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<pre>
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meson configure build/
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</pre>
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<p>
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With additional arguments <code>meson configure</code> is used to change
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options on already configured build directory. All options passed to this
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command are in the form -D "command"="value".
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</p>
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<pre>
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meson configure build/ -Dprefix=/tmp/install -Dglx=true
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</pre>
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<p>
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Once you've run the initial <code>meson</code> command successfully you can use
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your configured backend to build the project. With ninja, the -C option can be
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be used to point at a directory to build.
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</p>
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<pre>
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ninja -C build/
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</pre>
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<p>
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Without arguments, it will produce libGL.so and/or several other libraries
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depending on the options you have chosen. Later, if you want to rebuild for a
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different configuration, you should run <code>ninja clean</code> before
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changing the configuration, or create a new out of tree build directory for
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each configuration you want to build.
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http://mesonbuild.com/Using-multiple-build-directories.html
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</p>
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<dt><code>Environment Variables</code></dt>
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<dd><p>Meson supports the standard CC and CXX envrionment variables for
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changing the default compiler, and CFLAGS, CXXFLAGS, and LDFLAGS for setting
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options to the compiler and linker.
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The default compilers depends on your operating system. Meson supports most of
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the popular compilers, a complete list is available
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<a href="http://mesonbuild.com/Reference-tables.html#compiler-ids">here</a>.
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These arguments are consumed and stored by meson when it is initialized or
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re-initialized. Therefore passing them to meson configure will not do anything,
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and passing them to ninja will only do something if ninja decides to
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re-initialze meson, for example, if a meson.build file has been changed.
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Changing these variables will not cause all targets to be rebuilt, so running
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ninja clean is recomended when changing CFLAGS or CXXFLAGS. meson will never
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change compiler in a configured build directory.
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</p>
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<pre>
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CC=clang CXX=clang++ meson build-clang
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ninja -C build-clang
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ninja -C build-clang clean
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touch meson.build
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CFLAGS=-Wno-typedef-redefinition ninja -C build-clang
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</pre>
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<p>Meson also honors DESTDIR for installs</p>
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</dd>
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<dl>
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<dt><code>LLVM</code></dt>
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<dd><p>Meson includes upstream logic to wrap llvm-config using it's standard
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dependncy interface. It will search $PATH (or %PATH% on windows) for
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llvm-config, so using an LLVM from a non-standard path is as easy as
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<code>PATH=/path/with/llvm-config:$PATH meson build</code>.
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</p></dd>
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</dl>
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<dl>
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<dt><code>PKG_CONFIG_PATH</code></dt>
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<dd><p>The
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<code>pkg-config</code> utility is a hard requirement for configuring and
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building Mesa on Unix-like systems. It is used to search for external libraries
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on the system. This environment variable is used to control the search path for
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<code>pkg-config</code>. For instance, setting
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<code>PKG_CONFIG_PATH=/usr/X11R6/lib/pkgconfig</code> will search for package
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metadata in <code>/usr/X11R6</code> before the standard directories.</p>
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</dd>
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</dl>
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<p>
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One of the oddities of meson is that some options are different when passed to
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the <code>meson</code> than to <code>meson configure</code>. These options are
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passed as --option=foo to <code>meson</code>, but -Doption=foo to <code>meson
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configure</code>. Mesa defined options are always passed as -Doption=foo.
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<p>
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<p>For those coming from autotools be aware of the following:</p>
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<dl>
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<dt><code>--buildtype/-Dbuildtype</code></dt>
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<dd><p>This option will set the compiler debug/optimisation levels to aid
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debugging the Mesa libraries.</p>
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<p>Note that in meson this defaults to "debugoptimized", and not setting it to
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"release" will yield non-optimal performance and binary size. Not using "debug"
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may interfer with debbugging as some code and validation will be optimized
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away.
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</p>
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<p> For those wishing to pass their own optimization flags, use the "plain"
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buildtype, which causes meson to inject no additional compiler arguments, only
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those in the C/CXXFLAGS and those that mesa itself defines.</p>
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</dd>
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</dl>
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<dl>
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<dt><code>-Db_ndebug</code></dt>
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<dd><p>This option controls assertions in meson projects. When set to false
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(the default) assertions are enabled, when set to true they are disabled. This
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is unrelated to the <code>buildtype</code>; setting the latter to
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<code>release</code> will not turn off assertions.
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</p>
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</dd>
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</dl>
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