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<div class="document">
<div class="section" id="scons-script">
<h1><a class="toc-backref" href="#id1">SCons script</a></h1>
<p>the purpose of this script is to run a build of tpt from start to finish, including dependency checks.</p>
<div class="contents topic" id="table-of-contents">
<p class="topic-title first">Table of Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#scons-script" id="id1">SCons script</a></li>
<li><a class="reference internal" href="#requirements" id="id2">requirements</a><ul>
<li><a class="reference internal" href="#stdlib" id="id3">stdlib</a></li>
<li><a class="reference internal" href="#rd-party" id="id4">3rd party</a></li>
</ul>
</li>
<li><a class="reference internal" href="#long-commandlines" id="id5">long commandlines</a></li>
<li><a class="reference internal" href="#commandline-options" id="id6">commandline options</a></li>
<li><a class="reference internal" href="#main-program" id="id7">main program</a><ul>
<li><a class="reference internal" href="#platform-selection" id="id8">platform selection</a><ul>
<li><a class="reference internal" href="#generic-platform-settings" id="id9">generic platform settings</a></li>
<li><a class="reference internal" href="#windows-specific-platform-settings" id="id10">windows specific platform settings</a></li>
<li><a class="reference internal" href="#macosx-specific-platform-settings" id="id11">macosx specific platform settings</a></li>
</ul>
</li>
<li><a class="reference internal" href="#enviroment-setup" id="id12">enviroment setup</a><ul>
<li><a class="reference internal" href="#generic-enviroment-settings" id="id13">generic enviroment settings</a></li>
<li><a class="reference internal" href="#rpi-specific-enviroment-settings" id="id14">rpi specific enviroment settings</a></li>
<li><a class="reference internal" href="#windows-specific-enviroment-settings" id="id15">windows specific enviroment settings</a></li>
<li><a class="reference internal" href="#linux-specific-enviroment-settings" id="id16">linux specific enviroment settings</a></li>
<li><a class="reference internal" href="#macosx-specific-enviroment-settings" id="id17">macosx specific enviroment settings</a></li>
</ul>
</li>
<li><a class="reference internal" href="#defines" id="id18">defines</a></li>
<li><a class="reference internal" href="#compiling" id="id19">compiling</a><ul>
<li><a class="reference internal" href="#sources" id="id20">sources</a><ul>
<li><a class="reference internal" href="#windows-specific-sources" id="id21">windows specific sources</a></li>
<li><a class="reference internal" href="#macosx-specific-sources" id="id22">macosx specific sources</a></li>
</ul>
</li>
</ul>
</li>
<li><a class="reference internal" href="#apply-long-commandlines-fix" id="id23">apply long commandlines fix</a></li>
<li><a class="reference internal" href="#find-proper-executable-name" id="id24">find proper executable name</a></li>
<li><a class="reference internal" href="#detect-python-executable-name" id="id25">detect python executable name</a></li>
<li><a class="reference internal" href="#run-generator-commands" id="id26">run generator commands</a></li>
<li><a class="reference internal" href="#final-settings" id="id27">final settings</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="section" id="requirements">
<h1><a class="toc-backref" href="#id2">requirements</a></h1>
<div class="section" id="stdlib">
<h2><a class="toc-backref" href="#id3">stdlib</a></h2>
<pre class="literal-block">
import os
import sys
import subprocess
import time
</pre>
</div>
<div class="section" id="rd-party">
<h2><a class="toc-backref" href="#id4">3rd party</a></h2>
<p>nothing besides scons.</p>
</div>
</div>
<div class="section" id="long-commandlines">
<h1><a class="toc-backref" href="#id5">long commandlines</a></h1>
<!-- : Fix for long command line - http://scons.org/wiki/LongCmdLinesOnWin32 -->
<p>because of an implementation detail commandlines are limited to 10000 characters on windows using mingw. the following fix was copied from
<a class="reference external" href="http://scons.org/wiki/LongCmdLinesOnWin32">http://scons.org/wiki/LongCmdLinesOnWin32</a> and circumvents this issue.</p>
<pre class="literal-block">
class ourSpawn:
def ourspawn(self, sh, escape, cmd, args, env):
newargs = ' '.join(args[1:])
cmdline = cmd + " " + newargs
startupinfo = subprocess.STARTUPINFO()
startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
proc = subprocess.Popen(cmdline, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, startupinfo=startupinfo, shell = False, env = env)
data, err = proc.communicate()
rv = proc.wait()
if rv:
print "====="
print err
print "====="
return rv
def SetupSpawn( env ):
if sys.platform == 'win32':
buf = ourSpawn()
buf.ourenv = env
env['SPAWN'] = buf.ourspawn
</pre>
</div>
<div class="section" id="commandline-options">
<h1><a class="toc-backref" href="#id6">commandline options</a></h1>
<p>the following defines all optional commandlines</p>
<pre class="literal-block">
AddOption('--opengl',dest="opengl",action='store_true',default=False,help="Build with OpenGL interface support.")
AddOption('--opengl-renderer',dest="opengl-renderer",action='store_true',default=False,help="Build with OpenGL renderer support. (requires --opengl)")
AddOption('--renderer',dest="renderer",action='store_true',default=False,help="Save renderer")
AddOption('--macosx',dest="macosx",action='store_true',default=False,help="Mac OS X platform target")
AddOption('--rpi',dest="rpi",action='store_true',default=False,help="Raspbain platform target")
AddOption('--64bit',dest="_64bit",action='store_true',default=False,help="64-bit platform target")
AddOption('--static',dest="static",action="store_true",default=False,help="Static linking, reduces external library dependancies but increased file size")
AddOption('--pthreadw32-static',dest="ptw32-static",action="store_true",default=False,help="Use PTW32_STATIC_LIB for pthreadw32 headers")
AddOption('--python-ver',dest="pythonver",default=False,help="Python version to use for generator.py")
AddOption('--release',dest="release",action='store_true',default=False,help="Enable optimisations (Will slow down compiling)")
AddOption('--lua-dir',dest="lua-dir",default=False,help="Directory for lua includes")
AddOption('--sdl-dir',dest="sdl-dir",default=False,help="Directory for SDL includes")
AddOption('--tool',dest="toolprefix",default=False,help="Prefix")
AddOption('--sse',dest="sse",action='store_true',default=False,help="Enable SSE optimisations")
AddOption('--sse2',dest="sse2",action='store_true',default=False,help="Enable SSE2 optimisations")
AddOption('--sse3',dest="sse3",action='store_true',default=False,help="Enable SSE3 optimisations")
AddOption('--x86',dest="x86",action='store_true',default=True,help="Target Intel x86 platform")
AddOption('--nofft',dest="nofft", action='store_true',default=False,help="Do not use fftw3f for gravity.")
AddOption('--nolua',dest="nolua", action='store_true',default=False,help="Disable all lua scripting features.")
AddOption('--debugging', dest="debug", action="store_true", default=False, help="Enable debug options")
AddOption('--beta',dest="beta",action='store_true',default=False,help="Beta build.")
AddOption('--save-version',dest="save-version",default=False,help="Save version.")
AddOption('--minor-version',dest="minor-version",default=False,help="Minor version.")
AddOption('--build-number',dest="build-number",default=False,help="Build number.")
AddOption('--snapshot',dest="snapshot",action='store_true',default=False,help="Snapshot build.")
AddOption('--snapshot-id',dest="snapshot-id",default=False,help="Snapshot build ID.")
AddOption('--stable',dest="stable",default=True,help="Non snapshot build")
AddOption('--aao', dest="everythingAtOnce", action='store_true', default=False, help="Compile the whole game without generating intermediate objects (very slow), enable this when using compilers like clang or mscc that don't support -fkeep-inline-functions")
</pre>
<p>using either of these commandline options is compulsory</p>
<pre class="literal-block">
AddOption('--win',dest="win",action='store_true',default=False,help="Windows platform target.")
AddOption('--lin',dest="lin",action='store_true',default=False,help="Linux platform target")
</pre>
</div>
<div class="section" id="main-program">
<h1><a class="toc-backref" href="#id7">main program</a></h1>
<p>the gist of the compiling rules are defined here</p>
<div class="section" id="platform-selection">
<h2><a class="toc-backref" href="#id8">platform selection</a></h2>
<div class="section" id="generic-platform-settings">
<h3><a class="toc-backref" href="#id9">generic platform settings</a></h3>
<p>check if a platform is specified.
.. : TODO: make it suggest commandline options if it isn't</p>
<pre class="literal-block">
if((not GetOption('lin')) and (not GetOption('win')) and (not GetOption('rpi')) and (not GetOption('macosx'))):
print "You must specify a platform to target"
raise SystemExit(1)
</pre>
<p>check if a tool prefix is set, and if it is select the propper tools for building.
.. : TODO someone explain wtf this actually does</p>
<pre class="literal-block">
if GetOption("toolprefix"):
env['CC'] = GetOption("toolprefix")+env['CC']
env['CXX'] = GetOption("toolprefix")+env['CXX']
if GetOption('win'):
env['RC'] = GetOption("toolprefix")+env['RC']
</pre>
</div>
<div class="section" id="windows-specific-platform-settings">
<h3><a class="toc-backref" href="#id10">windows specific platform settings</a></h3>
<p>if the platform is windows switch to a mingw toolset, use the default otherwise</p>
<pre class="literal-block">
if(GetOption('win')):
env = Environment(tools = ['mingw'], ENV = os.environ)
else:
env = Environment(tools = ['default'], ENV = os.environ)
</pre>
</div>
<div class="section" id="macosx-specific-platform-settings">
<h3><a class="toc-backref" href="#id11">macosx specific platform settings</a></h3>
<p>if we're not on MACOSX check for headers etc</p>
<pre class="literal-block">
if not GetOption("macosx"):
conf = Configure(env)
</pre>
<p>if sdl-dir is set check if we can find the sdl header there, if we can't just pass the header path to the compiler.</p>
<pre class="literal-block">
if(GetOption("sdl-dir")):
if not conf.CheckCHeader(GetOption("sdl-dir") + '/SDL.h'):
print "sdl headers not found or not installed"
raise SystemExit(1)
else:
env.Append(CPPPATH=[GetOption("sdl-dir")])
else:
</pre>
<p>otherwise try to parse the pkg config for sdl and grab the correct flags from there.</p>
<pre class="literal-block">
try:
env.ParseConfig('sdl-config --cflags')
env.ParseConfig('sdl-config --libs')
except:
if not conf.CheckLib("SDL"):
print "libSDL not found or not installed"
raise SystemExit(1)
</pre>
<p>if lua is enabled try to parse the lua pgk-config, if that fails try the lua-dir option
.. : TODO: make this look the same as the SDL check, maybe make a function for it. keep it DRY.</p>
<pre class="literal-block">
if not GetOption("nolua"):
try:
env.ParseConfig('pkg-config --cflags lua5.1')
except:
if(GetOption("lua-dir")):
if not conf.CheckCHeader(GetOption("lua-dir") + '/lua.h'):
print "lua5.1 headers not found or not installed"
raise SystemExit(1)
else:
env.Append(CPPPATH=[GetOption("lua-dir")])
</pre>
<p>if fft is enabled try to parse its config, fail otherwise.</p>
<pre class="literal-block">
if not GetOption('nofft'):
# Check for FFT lib
if not conf.CheckLib('fftw3f') and not conf.CheckLib('fftw3f-3'):
print "libfftw3f not found or not installed"
raise SystemExit(1)
</pre>
<p>try to autodetect some libraries, fail otherwise</p>
<pre class="literal-block">
#Check for Bzip lib
if not conf.CheckLib('bz2'):
print "libbz2 not found or not installed"
raise SystemExit(1)
#Check for zlib
if not conf.CheckLib('z'):
print "libz not found or not installed"
raise SystemExit(1)
if not conf.CheckCHeader("bzlib.h"):
print "bzip2 headers not found"
raise SystemExit(1)
</pre>
<!-- : TODO: checking if it's macosx again? seems like bitrot. -->
<pre class="literal-block">
#Check for Lua lib
if not GetOption("macosx") and not GetOption("nolua"):
if not conf.CheckLib('lua5.1') and not conf.CheckLib('lua-5.1') and not conf.CheckLib('lua51') and not conf.CheckLib('lua'):
print "liblua not found or not installed"
raise SystemExit(1)
</pre>
<p>finish the configuration</p>
<pre class="literal-block">
env = conf.Finish();
else:
</pre>
<p>if we ARE on macosx add the libraries to LIBS
.. : seems like we're terrible at mac support? what gives?</p>
<pre class="literal-block">
env.Append(LIBS=['z', 'bz2'])
if not GetOption('nofft'):
env.Append(LIBS=['fftw3f'])
</pre>
</div>
</div>
<div class="section" id="enviroment-setup">
<h2><a class="toc-backref" href="#id12">enviroment setup</a></h2>
<p>add the correct compiler flags.</p>
<div class="section" id="generic-enviroment-settings">
<h3><a class="toc-backref" href="#id13">generic enviroment settings</a></h3>
<p>make sure the compiler can find the source data and generated files. enable warnings, set C++ flavor, and keep inline functions</p>
<pre class="literal-block">
env.Append(CPPPATH=['src/', 'data/', 'generated/'])
env.Append(CCFLAGS=['-w', '-std=c++98', '-fkeep-inline-functions'])
env.Append(LIBS=['pthread', 'm'])
env.Append(CPPDEFINES=["_GNU_SOURCE", "USE_STDINT", "_POSIX_C_SOURCE=200112L"])
</pre>
<p>check all enabled libs, and add a define if they are enabled.</p>
<pre class="literal-block">
if not GetOption('nofft'):
env.Append(CPPDEFINES=["GRAVFFT"])
if not GetOption('nolua'):
env.Append(CPPDEFINES=["LUACONSOLE"])
</pre>
<p>check if we need to use PTW32_STATIC_LIB for pthreadw32 headers
.. : TODO: explain this so it actually means something :P</p>
<pre class="literal-block">
if GetOption("ptw32-static"):
env.Append(CPPDEFINES=['PTW32_STATIC_LIB']);
</pre>
<p>check if we need to do static linking.</p>
<pre class="literal-block">
if(GetOption('static')):
env.Append(LINKFLAGS=['-static-libgcc'])
</pre>
<p>check if we need to compile the save renderer. add a define accordingly. compile the game by default.</p>
<pre class="literal-block">
if(GetOption('renderer')):
env.Append(CPPDEFINES=['RENDERER'])
else:
env.Append(CPPDEFINES=["USE_SDL"])
</pre>
<p>apply optimisations if it's a release build</p>
<pre class="literal-block">
if(GetOption('release')):
if GetOption('macosx'):
env.Append(CCFLAGS=['-O3', '-ftree-vectorize', '-funsafe-math-optimizations', '-ffast-math', '-fomit-frame-pointer'])
else:
env.Append(CCFLAGS=['-O3', '-ftree-vectorize', '-funsafe-math-optimizations', '-ffast-math', '-fomit-frame-pointer', '-funsafe-loop-optimizations', '-Wunsafe-loop-optimizations'])
</pre>
</div>
<div class="section" id="rpi-specific-enviroment-settings">
<h3><a class="toc-backref" href="#id14">rpi specific enviroment settings</a></h3>
<p>check if we're compiling for rpi, if we are include rpi specific libraries and defines.</p>
<pre class="literal-block">
if(GetOption('rpi')):
if(GetOption('opengl')):
env.ParseConfig('pkg-config --libs glew gl glu')
openGLLibs = ['GL']
env.Append(LIBS=['X11', 'rt'])
env.Append(CPPDEFINES=["LIN"])
</pre>
</div>
<div class="section" id="windows-specific-enviroment-settings">
<h3><a class="toc-backref" href="#id15">windows specific enviroment settings</a></h3>
<p>check if we're compiling for windows, if we are include windows specific libraries and defines.</p>
<pre class="literal-block">
if(GetOption('win')):
openGLLibs = ['opengl32', 'glew32']
env.Prepend(LIBS=['mingw32', 'ws2_32', 'SDLmain', 'regex'])
env.Append(CCFLAGS=['-std=gnu++98'])
env.Append(LIBS=['winmm', 'gdi32'])
env.Append(CPPDEFINES=["WIN"])
env.Append(LINKFLAGS=['-mwindows'])
if(GetOption('_64bit')):
env.Append(CPPDEFINES=['__CRT__NO_INLINE'])
env.Append(LINKFLAGS=['-Wl,--stack=16777216'])
</pre>
</div>
<div class="section" id="linux-specific-enviroment-settings">
<h3><a class="toc-backref" href="#id16">linux specific enviroment settings</a></h3>
<p>check if we're compiling for linux, if we are include linux specific libraries and defines.</p>
<pre class="literal-block">
if(GetOption('lin')):
if(GetOption('opengl')):
env.ParseConfig('pkg-config --libs glew gl glu')
openGLLibs = ['GL']
env.Append(LIBS=['X11', 'rt'])
env.Append(CPPDEFINES=["LIN"])
if GetOption('_64bit'):
env.Append(LINKFLAGS=['-m64'])
env.Append(CCFLAGS=['-m64'])
else:
env.Append(LINKFLAGS=['-m32'])
env.Append(CCFLAGS=['-m32'])
</pre>
</div>
<div class="section" id="macosx-specific-enviroment-settings">
<h3><a class="toc-backref" href="#id17">macosx specific enviroment settings</a></h3>
<p>check if we're compiling for macosx, if we are include macosx specific libraries and defines.</p>
<pre class="literal-block">
if(GetOption('macosx')):
env.Append(CPPDEFINES=["MACOSX"])
env.Append(CCFLAGS=['-I/Library/Frameworks/SDL.framework/Headers'])
env.Append(CCFLAGS=['-I/Library/Frameworks/Lua.framework/Headers'])
if not GetOption('nofft'):
env.Append(LINKFLAGS=['-lfftw3f'])
env.Append(LINKFLAGS=['-framework'])
env.Append(LINKFLAGS=['SDL'])
env.Append(LINKFLAGS=['-framework'])
env.Append(LINKFLAGS=['Lua'])
env.Append(LINKFLAGS=['-framework']);
env.Append(LINKFLAGS=['Cocoa'])
#env.Append(LINKFLAGS=['-framework SDL'])
#env.Append(LINKFLAGS=['-framework Lua'])
#env.Append(LINKFLAGS=['-framework Cocoa'])
if GetOption('_64bit'):
env.Append(LINKFLAGS=['-m64'])
env.Append(CCFLAGS=['-m64'])
else:
env.Append(LINKFLAGS=['-m32'])
env.Append(CCFLAGS=['-m32'])
</pre>
</div>
</div>
<div class="section" id="defines">
<h2><a class="toc-backref" href="#id18">defines</a></h2>
<p>A lot of commandline flags translate directly into defines. those flags follow:</p>
<pre class="literal-block">
if GetOption('_64bit'):
env.Append(CPPDEFINES=["_64BIT"])
if(GetOption('beta')):
env.Append(CPPDEFINES='BETA')
if(not GetOption('snapshot') and not GetOption('beta') and not GetOption('release') and not GetOption('stable')):
env.Append(CPPDEFINES='SNAPSHOT_ID=0')
env.Append(CPPDEFINES='SNAPSHOT')
elif(GetOption('snapshot') or GetOption('snapshot-id')):
if(GetOption('snapshot-id')):
env.Append(CPPDEFINES=['SNAPSHOT_ID=' + GetOption('snapshot-id')])
else:
env.Append(CPPDEFINES=['SNAPSHOT_ID=' + str(int(time.time()))])
env.Append(CPPDEFINES='SNAPSHOT')
elif(GetOption('stable')):
env.Append(CPPDEFINES='STABLE')
if(GetOption('save-version')):
env.Append(CPPDEFINES=['SAVE_VERSION=' + GetOption('save-version')])
if(GetOption('minor-version')):
env.Append(CPPDEFINES=['MINOR_VERSION=' + GetOption('minor-version')])
if(GetOption('build-number')):
env.Append(CPPDEFINES=['BUILD_NUM=' + GetOption('build-number')])
if(GetOption('x86')):
env.Append(CPPDEFINES='X86')
if(GetOption('debug')):
env.Append(CPPDEFINES='DEBUG')
env.Append(CCFLAGS='-g')
if(GetOption('sse')):
env.Append(CCFLAGS='-msse')
env.Append(CPPDEFINES='X86_SSE')
if(GetOption('sse2')):
env.Append(CCFLAGS='-msse2')
env.Append(CPPDEFINES='X86_SSE2')
if(GetOption('sse3')):
env.Append(CCFLAGS='-msse3')
env.Append(CPPDEFINES='X86_SSE3')
if(GetOption('opengl')):
env.Append(CPPDEFINES=["OGLI", "PIX32OGL"])
env.Append(LIBS=openGLLibs)
if(GetOption('opengl') and GetOption('opengl-renderer')):
env.Append(CPPDEFINES=["OGLR"])
elif(GetOption('opengl-renderer')):
print "opengl-renderer requires opengl"
raise SystemExit(1)
</pre>
</div>
<div class="section" id="compiling">
<h2><a class="toc-backref" href="#id19">compiling</a></h2>
<div class="section" id="sources">
<h3><a class="toc-backref" href="#id20">sources</a></h3>
<p>find all source files</p>
<pre class="literal-block">
# generic sources
# ---------------
sources=Glob("src/*.cpp")
sources+=Glob("src/*/*.cpp")
sources+=Glob("src/gui/*/*.cpp")
sources+=Glob("src/simulation/elements/*.cpp")
sources+=Glob("src/simulation/tools/*.cpp")
sources+=Glob("src/client/requestbroker/*.cpp")
if not GetOption('nolua'):
sources+=Glob("src/socket/*.c")
</pre>
<div class="section" id="windows-specific-sources">
<h4><a class="toc-backref" href="#id21">windows specific sources</a></h4>
<pre class="literal-block">
if(GetOption('win')):
sources += env.RES('resources/powder-res.rc')
sources = filter(lambda source: not 'src\\simulation\\Gravity.cpp' in str(source), sources)
sources = filter(lambda source: not 'src/simulation/Gravity.cpp' in str(source), sources)
</pre>
</div>
<div class="section" id="macosx-specific-sources">
<h4><a class="toc-backref" href="#id22">macosx specific sources</a></h4>
<pre class="literal-block">
if(GetOption('macosx')):
sources +=["SDLMain.m"]
</pre>
</div>
</div>
</div>
<div class="section" id="apply-long-commandlines-fix">
<h2>apply <a class="reference internal" href="#long-commandlines">long commandlines</a> fix</h2>
<p>apply the commandline fix</p>
<pre class="literal-block">
SetupSpawn(env)
</pre>
</div>
<div class="section" id="find-proper-executable-name">
<h2><a class="toc-backref" href="#id24">find proper executable name</a></h2>
<p>use some settings to detect what name to use for the executable</p>
<pre class="literal-block">
programName = "powder"
if(GetOption('renderer')):
programName = "render"
if(GetOption('win')):
if(GetOption('renderer')):
programName = "Render"
else:
programName = "Powder"
if(GetOption('_64bit')):
programName += "64"
if(not (GetOption('sse2') or GetOption('sse3'))):
programName += "-legacy"
if(GetOption('macosx')):
programName += "-x"
if(GetOption('win')):
programName += ".exe"
</pre>
</div>
<div class="section" id="detect-python-executable-name">
<h2><a class="toc-backref" href="#id25">detect python executable name</a></h2>
<p>detect the executable name for python so we can run some generator scripts</p>
<pre class="literal-block">
if(GetOption('pythonver')):
pythonVer = GetOption('pythonver')
elif(GetOption('lin')):
pythonVer = "python2"
else:
pythonVer = "python"
</pre>
<!-- if(GetOption('win')): # this seems like dead code, when you uncomment this add some documentation please
envCopy = env.Clone()
envCopy.Append(CCFLAGS=['-mincoming-stack-boundary=2'])
sources+=envCopy.Object('src/simulation/Gravity.cpp') -->
</div>
<div class="section" id="run-generator-commands">
<h2><a class="toc-backref" href="#id26">run generator commands</a></h2>
<pre class="literal-block">
env.Command(['generated/ElementClasses.cpp', 'generated/ElementClasses.h'], Glob('src/simulation/elements/*.cpp'), pythonVer + " generator.py elements $TARGETS $SOURCES")
sources+=Glob("generated/ElementClasses.cpp")
env.Command(['generated/ToolClasses.cpp', 'generated/ToolClasses.h'], Glob('src/simulation/tools/*.cpp'), pythonVer + " generator.py tools $TARGETS $SOURCES")
sources+=Glob("generated/ToolClasses.cpp")
</pre>
</div>
<div class="section" id="final-settings">
<h2><a class="toc-backref" href="#id27">final settings</a></h2>
<p>make a MD5 checksum decide wether or not a file changed. we had some problems with using the modification date for this purpose.</p>
<pre class="literal-block">
env.Decider('MD5')
</pre>
<p>set a defaukt target</p>
<pre class="literal-block">
t=env.Program(target=programName, source=sources)
Default(t)
</pre>
</div>
</div>
</div>
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