2 Blenders SCons build scripts
3 ============================
8 Since the beginning of 2004 Blender has had the SCons system as a
9 build option. SCons is a Python-based, accurate build system. The
10 scripts that were implemented in the first iteration worked, but
11 the system grew quickly into such a state that maintaining it became
12 a nightmare, and adding new features was just horrible, leading to
13 many hacks without much sense in the overall structure.
15 The rewrite has been waiting for a long time. Jonathan Jacobs provided
16 a first overhaul of the scripts, which I used in the first phase of
17 the rewrite. To make the system as maintainable as possible I made
18 some radical changes, but thanks go to Jonathan for providing me
19 with the patch to get started.
21 This document describes the usage of the new SCons scripts. The
22 inner workings are described in scons-dev.txt.
27 To build Blender with the SCons scripts you need a full Python
28 install, version 2.4 or later (http://www.python.org). We already provide
29 a scons-local installation, which can be found in the scons/ subdirectory.
30 This document uses the scons-local installation for its examples.
33 http://www.blender.org/development/building-blender/getting-dependencies/
34 that you have all dependencies needed for building Blender. Note that for
35 windows many of these dependencies already come in the lib/windows module
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, start the SCons entry script on Windows (will be used for the remainder
44 % python scons\scons.py
46 On a Unix-compatible system it would be
48 % python ./scons/scons.py
50 This will start the build process with default values. Depending
51 on your platform you may see colour in your output (non-Windows
52 machines). In the the beginning an overview of targets and arguments
53 from the command-line is given, then all libraries and binaries to
56 The build uses BF_BUILDDIR to build into and BF_INSTALLDIR to
57 finally copy all needed files to get a proper setup. The BF_DOCDIR is
58 used to generate Blender Python documentation files to. These
59 variables have default values for every platform in
60 $BLENDERHOME/config/(platform)-config.py. After the build successfully
61 completes, you can find everything you need in BF_INSTALLDIR.
63 If you want to create the installer package of Blender on Windows you'll
64 need to install nullsoft scriptable install system from http://nsis.sf.net.
65 As an extra dependency, you need the MoreInfo plugin too. The creation of
66 the installer is tied into the build process and can be triggered with:
68 % python scons\scons.py nsis
74 The default values for your platform can be found in the directory
75 $BLENDERHOME/config. Your platform specific defaults are in
76 (platform)-config.py, where platform is one of:
78 - linux, for machines running Linux
79 - win32-vc, for Windows machines, compiling with a Microsoft compiler
80 - win32-mingw, for Windows machines, compiling with the MingW compiler
81 - darwin, for OS X machines
82 (TBD: add cygwin, solaris and freebsd support)
84 These files you will normally not change. If you need to override
85 a default value, make a file called $BLENDERHOME/user-config.py, and copy
86 settings from the config/(platform)-config.py that you want to change. Don't
87 copy the entire file (unless explicitely stated in the configuration file),
88 because you may not get updated options you don't change yourself, which may
89 result in build errors.
91 You can use BF_CONFIG argument to override the default user-config.py
92 check. This is just like the user-config.py, but just with another name:
94 % python scons\scons.py BF_CONFIG=myownsettings
96 If you want to quickly test a new setting, you can give the option
97 also on the command-line:
99 % python scons\scons.py BF_BUILDDIR=../mybuilddir WITH_BF_OPENEXR=0
101 This command sets the build directory to BF_BUILDDIR and disables
104 If you need to know what can be set through the command-line, run
107 % python scons\scons.py -h
109 This command will print a long list with settable options and what
110 every option means. Many of the default values will be empty, and
111 from a fresh checkout without a user-config.py the actual values
112 are the defaults as per $BLENDERHOME/config/(platform)-config.py
113 (unless you have overridden any of them in your
114 $BLENDERHOME/user-config.py).
116 NOTE: The best way to avoid confusion is the
117 copy $BLENDERHOME/config/(platform)-config.py to
118 $BLENDERHOME/user-config.py. You should NEVER have to modify
119 $BLENDERHOME/config/(platform)-config.py
121 Configuring the output
122 ----------------------
124 This rewrite features a cleaner output during the build process. If
125 you need to see the full command-line for compiles, then you can
126 change that behaviour. Also the use of colours can be changed:
128 % python scons\scons.py BF_FANCY=0
130 This will disable the use of colours.
132 % python scons\scons.py BF_QUIET=0
134 This will give the old, noisy output. Every command-line per
135 compile is printed out in its full glory. This is very useful when
136 debugging problems with compiling, because you can see what the
137 included paths are, what defines are given on the command-line,
138 what compiler switches are used, etc.
140 Compiling Only Some Libraries
141 -----------------------------
143 Our implementation now has support for specifying a list of libraries that are
144 exclusively compiled, ignoring all other libraries. This is invoked
145 with the BF_QUICK arguments; for example:
147 % python scons\scons.py BF_QUICK=src,bf_blenkernel
149 Note that this not the same as passing a list of folders as in the
150 makefile's "quicky" command. In Scons, all of Blender's code modules
151 are in their own static library; this corresponds to one-lib-per-folder
152 in some cases (especially in blender/source/blender).
154 To obtain a list of the libraries, simple fire up scons and CTRL-C out once
155 it finishes configuring (and printing to the console) the library list.
157 Compiling Libraries With Debug Profiling
158 ----------------------------------------
160 Scons has support for specifying a list of libraries that are compiled
161 with debug profiling enabled. This is implemented in two commands:
162 BF_QUICKDEBUG which is a command-line argument and BF_DEBUG_LIBS, which goes
163 in your user-config.py
165 BF_QUICKDEBUG is similar to BF_QUICK:
167 % python scons\scons.py BF_QUICKDEBUG=src,bf_blenkernel,some-other-lib
169 To use BF_DEBUG_LIBS, put something like the following in you user-config.py:
171 BF_DEBUG_LIBS = ['bf_blenlib', 'src', 'some_lib']
173 For instructions on how to find the names of the libraries (folders) you
174 wish to use, see the above section. Note that the command BF_DEBUG
175 (see below) will override these settings and compile ALL of Blender with
176 debug symbols. Also note that BF_QUICKDEBUG and BF_DEBUG_LIBS are combined;
177 for example, setting BF_QUICKDEBUG won't overwrite the contents of BF_DEBUG_LIBS.
184 * msvc, this is a full install of Microsoft Visual C++. You'll
185 likely have the .NET Framework SDK, Platform SDK and DX9 SDK
186 installed * mstoolkit, this is the free MS VC++ 2003 Toolkit. You
187 need to verify you have also the SDKs installed as mentioned
188 for msvc. * mingw, this is a minimal MingW install. TBD: write
189 proper instructions on getting needed packages.
191 On Windows with all of the three toolset installed you need to
192 specify what toolset to use
194 % python scons\scons.py BF_TOOLSET=msvc
195 % python scons\scons.py BF_TOOLSET=mingw
199 Currently only the default toolsets are supported for these platforms,
200 so nothing special needs to be told to SCons when building. The
201 defaults should work fine in most cases.
206 Build Blender with the defaults:
208 % python scons\scons.py
210 Build Blender, but disable OpenEXR support:
212 % python scons\scons.py WITH_BF_OPENEXR=0
214 Build Blender, enable debug symbols:
216 % python scons\scons.py BF_DEBUG=1
218 Build Blender, install to different directory:
220 % python scons\scons.py BF_INSTALLDIR=../myown/installdir
222 Build Blender in ../myown/builddir and install to ../myown/installdir:
224 % python scons\scons.py BF_BUILDDIR=../myown/builddir BF_INSTALLDIR=../myown/installdir
228 % python scons\scons.py clean
230 /Nathan Letwory (jesterKing)