3 Blenders SCons build scripts
4 ============================
9 Since the beginning of 2004 Blender has had the SCons system as a
10 build option. SCons is a Python-based, accurate build system. The
11 scripts that were implemented in the first iteration worked, but
12 the system grew quickly into such a state that maintaining it became
13 a nightmare, and adding new features was just horrible, leading to
14 many hacks without much sense in the overall structure.
16 The rewrite has been waiting for a long time. Jonathan Jacobs provided
17 a first overhaul of the scripts, which I used in the first phase of
18 the rewrite. To make the system as maintainable as possible I made
19 some radical changes, but thanks go to Jonathan for providing me
20 with the patch to get started.
22 This document describes the usage of the new SCons scripts. The
23 inner workings are described in blender-scons-dev.txt.
28 To build Blender with the SCons scripts you need a full Python
29 install, version 2.4 or later (http://www.python.org) and a SCons
30 installation, version v0.96.1.D001 or later (http://www.scons.org).
33 http://www.blender.org/cms/Getting_Dependencies.135.0.html that you
34 have all dependencies needed for building Blender. Note that for
35 windows many of these dependencies already come in the lib/windows
38 In the base directory of the sources (from now on called $BLENDERHOME)
39 you'll see a file named SConstruct. This is the entry point for the
40 SCons build system. In a terminal, change to this directory. To just
41 build, issue the command 'scons':
45 This will start the build process with default values. Depending
46 on your platform you may see colour in your output (non-Windows
47 machines). In the the beginning an overview of targets and arguments
48 from the command-line is given, then all libraries and binaries to
51 The build uses BF_BUILDDIR to build into and BF_INSTALLDIR to
52 finally copy all needed files to get a proper setup. These
53 variabbles have default values for every platform in
54 $BLENDERHOME/config/(platform)-config.py. After the build successfully
55 completes, you can find everything you need in BF_INSTALLDIR.
61 The default values for your platform can be found in the directory
62 $BLENDERHOME/config. Your platform specific defaults are in
63 (platform)-config.py, where platform is one of:
65 - linux2, for machines running Linux
66 - win32-vc, for Windows machines, compiling with a Microsoft compiler
67 - win32-mingw, for Windows machines, compiling with the MingW compiler
68 - darwin, for OS X machines
69 (TBD: add cygwin, solaris and freebsd support)
71 These files you will normally not change. If you need to override
72 a default value, make a copy of the proper configuration to
73 $BLENDERHOME/user-config.py. This file you can modify to your
74 likings. Any value set here will override the ones from the
77 If you want to quickly test a new setting, you can give the option
78 also on the command-line:
80 % scons BF_BUILDDIR=../mybuilddir WITH_BF_OPENEXR=0
82 This command sets the build directory to BF_BUILDDIR and disables
85 If you need to know what can be set through the command-line, run
90 This command will print a long list with settable options and what
91 every option means. Many of the default values will be empty, and
92 from a fresh checkout without a user-config.py the actual values
93 are the defaults as per $BLENDERHOME/config/(platform)-config.py
94 (unless you have overridden any of them in your
95 $BLENDERHOME/user-config.py).
97 NOTE: The best way to avoid confusion is the
98 copy $BLENDERHOME/config/(platform)-config.py to
99 $BLENDERHOME/user-config.py. You should NEVER have to modify
100 $BLENDERHOME/config/(platform)-config.py
102 Configuring the output
103 ----------------------
105 This rewrite features a cleaner output during the build process. If
106 you need to see the full command-line for compiles, then you can
107 change that behaviour. Also the use of colours can be changed:
111 This will disable the use of colours.
115 This will give the old, noisy output. Every command-line per
116 compile is printed out in its full glory. This is very useful when
117 debugging problems with compiling, because you can see what the
118 included paths are, what defines are given on the command-line,
119 what compiler switches are used, etc.
121 Compiling Only Some Libraries
122 -----------------------------
124 Scons now has support for specifying a list of libraries that are
125 exclusively compiled, ignoring all other libraries. This is invoked
126 with the BF_QUICK arguments; for example:
128 % scons BF_QUICK=src,bf_blenkernel
130 Note that this not the same as passing a list of folders as in the
131 makefile's "quicky" command. In Scons, all of Blender's code modules
132 are in their own static library; this corresponds to one-lib-per-folder
133 in some cases (especially in blender/source/blender).
135 To obtain a list of the libraries, simple fire up scons and CTRL-C out once
136 it finishes configuring (and printing to the console) the library list.
138 Compiling Libraries With Debug Profiling
139 ----------------------------------------
141 Scons has support for specifying a list of libraries that are compiled
142 with debug profiling enabled. This is implemented in two commands:
143 BF_QUICKDEBUG which is a command-line argument and BF_DEBUG_LIBS, which goes
144 in your user-config.py
146 BF_QUICKDEBUG is similar to BF_QUICK:
148 % scons BF_QUICKDEBUG=src,bf_blenkernel,some-other-lib
150 To use BF_DEBUG_LIBS, put something like the following in you user-config.py:
152 BF_DEBUG_LIBS = ['bf_blenlib', 'src', 'some_lib']
154 For instructions on how to find the names of the libraries (folders) you
155 wish to use, see the above section. Note that the command BF_DEBUG
156 (see below) will override these settings and compile ALL of Blender with
157 debug symbols. Also note that BF_QUICKDEBUG and BF_DEBUG_LIBS are combined;
158 for example, setting BF_QUICKDEBUG won't overwrite the contents of BF_DEBUG_LIBS.
166 * msvc, this is a full install of Microsoft Visual C++. You'll
167 likely have the .NET Framework SDK, Platform SDK and DX9 SDK
168 installed * mstoolkit, this is the free MS VC++ 2003 Toolkit. You
169 need to verify you have also the SDKs installed as mentioned
170 for msvc. * mingw, this is a minimal MingW install. TBD: write
171 proper instructions on getting needed packages.
173 On Windows with all of the three toolset installed you need to
174 specify what toolset to use
176 % scons BF_TOOLSET=msvc
177 % scons BF_TOOLSET=mstoolkit
178 % scons BF_TOOLSET=mingw
180 If you have only the toolkit installed, you will also need to give
181 BF_TOOLSET=mstoolkit on the command-line, to make sure everything is
182 setup properly. Currently there is no good mechanism to automatically
183 determine wether the found 'cl.exe' is from the toolkit or from a
188 Currently only the default toolsets are supported for these platforms,
189 so nothing special needs to be told to SCons when building. The
190 defaults should work fine in most cases.
195 Build Blender with the defaults:
199 Build Blender, but disable OpenEXR support:
201 % scons WITH_BF_OPENEXR=0
203 Build Blender, enable debug symbols:
207 Build Blender, install to different directory:
209 % scons BF_INSTALLDIR=/tmp/testbuild
211 Build Blender in /tmp/obj and install to /usr/local:
213 % scons BF_BUILDDIR=/tmp/obj BF_INSTALLDIR=/usr/local
219 Clean out the installed files:
223 /Nathan Letwory (jesterKing)