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-
- Blenders SCons build scripts
- ============================
-
- Introduction
- ------------
-
- Since the beginning of 2004 Blender has had the SCons system as a
- build option. SCons is a Python-based, accurate build system. The
- scripts that were implemented in the first iteration worked, but
- the system grew quickly into such a state that maintaining it became
- a nightmare, and adding new features was just horrible, leading to
- many hacks without much sense in the overall structure.
-
- The rewrite has been waiting for a long time. Jonathan Jacobs provided
- a first overhaul of the scripts, which I used in the first phase of
- the rewrite. To make the system as maintainable as possible I made
- some radical changes, but thanks go to Jonathan for providing me
- with the patch to get started.
-
- This document describes the usage of the new SCons scripts. The
- inner workings are described in scons-dev.txt.
-
- Building Blender
- ----------------
-
- To build Blender with the SCons scripts you need a full Python
- install, version 2.4 or later (http://www.python.org). We already provide
- a scons-local installation, which can be found in the scons/ subdirectory.
- This document uses the scons-local installation for its examples.
-
- For build instructions, including dependencies, consult the appropriate
- section for your platform at
- http://wiki.blender.org/index.php/Dev:Doc/Building_Blender. Note that for
- windows many of these dependencies already come in the lib/windows module
- from CVS.
-
- In the base directory of the sources (from now on called $BLENDERHOME)
- you'll see a file named SConstruct. This is the entry point for the
- SCons build system. In a terminal, change to this directory. To just
- build, start the SCons entry script on Windows (will be used for the remainder
- of this document):
-
- % python scons\scons.py
-
- On a Unix-compatible system it would be
-
- % python ./scons/scons.py
-
- This will start the build process with default values. Depending
- on your platform you may see color in your output (non-Windows
- machines). In the the beginning an overview of targets and arguments
- from the command-line is given, then all libraries and binaries to
- build are configured.
-
- The build uses BF_BUILDDIR to build into and BF_INSTALLDIR to finally copy
- all needed files to get a proper setup. The BF_DOCDIR is used to generate
- Blender Python documentation files to. These variables have default values
- for every platform in
- $BLENDERHOME/build_files/scons/config/(platform)-config.py. See the next
- section of this document for how to customize these paths. After the build
- successfully completes, you can find everything you need in BF_INSTALLDIR.
-
- If you want to create the installer package of Blender on Windows you'll
- need to install nullsoft scriptable install system from http://nsis.sf.net.
- As an extra dependency, you need the MoreInfo plugin too. The creation of
- the installer is tied into the build process and can be triggered with:
-
- % python scons\scons.py nsis
-
-
- Configuring the build
- ---------------------
-
- The default values for your platform can be found in the directory
- $BLENDERHOME/build_files/scons/config. Your platform specific defaults are
- in (platform)-config.py, where platform is one of:
-
- - linux, for machines running Linux
- - win32-vc, for Windows machines, compiling with a Microsoft compiler
- - win32-mingw, for Windows machines, compiling with the MingW compiler
- - darwin, for OS X machines
- (TBD: add cygwin, solaris and freebsd support)
-
- These files you will normally not change. If you need to override a
- default value, make a file called $BLENDERHOME/user-config.py, and copy
- settings from the build_files/scons/config/(platform)-config.py that you
- want to change. Don't copy the entire file (unless explicitly stated in
- the configuration file), because you may not get updated options you don't
- change yourself, which may result in build errors. You should NEVER have
- to modify $BLENDERHOME/build_files/scons/config/(platform)-config.py.
-
- You can use BF_CONFIG argument to override the default user-config.py
- check. This is just like the user-config.py, but just with another name:
-
- % python scons\scons.py BF_CONFIG=myownsettings
-
- If you want to quickly test a new setting, you can give the option
- also on the command-line:
-
- % python scons\scons.py BF_BUILDDIR=../mybuilddir WITH_BF_OPENEXR=0
-
- This command sets the build directory to BF_BUILDDIR and disables
- OpenEXR support.
-
- If you need to know what can be set through the command-line, run
- scons with -h:
-
- % python scons\scons.py -h
-
- This command will print a long list with settable options and what
- every option means. Many of the default values will be empty, and
- from a fresh checkout without a user-config.py the actual values
- are the defaults as per $BLENDERHOME/config/(platform)-config.py
- (unless you have overridden any of them in your
- $BLENDERHOME/user-config.py).
-
- Configuring the output
- ----------------------
-
- This rewrite features a cleaner output during the build process. If
- you need to see the full command-line for compiles, then you can
- change that behaviour. Also the use of colors can be changed:
-
- % python scons\scons.py BF_FANCY=0
-
- This will disable the use of colors.
-
- % python scons\scons.py BF_QUIET=0
-
- This will give the old, noisy output. Every command-line per
- compile is printed out in its full glory. This is very useful when
- debugging problems with compiling, because you can see what the
- included paths are, what defines are given on the command-line,
- what compiler switches are used, etc.
-
- Compiling Only Some Libraries
- -----------------------------
-
- Our implementation now has support for specifying a list of libraries that are
- exclusively compiled, ignoring all other libraries. This is invoked
- with the BF_QUICK arguments; for example:
-
- % python scons\scons.py BF_QUICK=src,bf_blenkernel
-
- Note that this not the same as passing a list of folders as in the
- makefile's "quicky" command. In Scons, all of Blender's code modules
- are in their own static library; this corresponds to one-lib-per-folder
- in some cases (especially in blender/source/blender).
-
- To obtain a list of the libraries, simple fire up scons and CTRL-C out once
- it finishes configuring (and printing to the console) the library list.
-
- Compiling Libraries With Debug Profiling
- ----------------------------------------
-
- Scons has support for specifying a list of libraries that are compiled
- with debug profiling enabled. This is implemented in two commands:
- BF_QUICKDEBUG which is a command-line argument and BF_DEBUG_LIBS, which goes
- in your user-config.py
-
- BF_QUICKDEBUG is similar to BF_QUICK:
-
- % python scons\scons.py BF_QUICKDEBUG=src,bf_blenkernel,some-other-lib
-
- To use BF_DEBUG_LIBS, put something like the following in you user-config.py:
-
- BF_DEBUG_LIBS = ['bf_blenlib', 'src', 'some_lib']
-
- For instructions on how to find the names of the libraries (folders) you
- wish to use, see the above section. Note that the command BF_DEBUG
- (see below) will override these settings and compile ALL of Blender with
- debug symbols. Also note that BF_QUICKDEBUG and BF_DEBUG_LIBS are combined;
- for example, setting BF_QUICKDEBUG won't overwrite the contents of BF_DEBUG_LIBS.
-
- Supported toolset
- -----------------
-
- WINDOWS
-
- * msvc, this is a full install of Microsoft Visual C++. You'll
- likely have the .NET Framework SDK, Platform SDK and DX9 SDK
- installed * mstoolkit, this is the free MS VC++ 2003 Toolkit. You
- need to verify you have also the SDKs installed as mentioned
- for msvc. * mingw, this is a minimal MingW install. TBD: write
- proper instructions on getting needed packages.
-
- On Windows with all of the three toolset installed you need to
- specify what toolset to use
-
- % python scons\scons.py BF_TOOLSET=msvc
- % python scons\scons.py BF_TOOLSET=mingw
-
- LINUX and OS X
-
- Currently only the default toolsets are supported for these platforms,
- so nothing special needs to be told to SCons when building. The
- defaults should work fine in most cases.
-
- Examples
- --------
-
- Build Blender with the defaults:
-
- % python scons\scons.py
-
- Build Blender, but disable OpenEXR support:
-
- % python scons\scons.py WITH_BF_OPENEXR=0
-
- Build Blender, enable debug symbols:
-
- % python scons\scons.py BF_DEBUG=1
-
- Build Blender, install to different directory:
-
- % python scons\scons.py BF_INSTALLDIR=../myown/installdir
-
- Build Blender in ../myown/builddir and install to ../myown/installdir:
-
- % python scons\scons.py BF_BUILDDIR=../myown/builddir BF_INSTALLDIR=../myown/installdir
-
- Clean BF_BUILDDIR:
-
- % python scons\scons.py clean
-
- /Nathan Letwory (jesterKing)