diff -r 5785cca4cdb9 -r 242839c6d27d SConstruct
--- a/SConstruct	Wed Apr 09 17:55:29 2008 +0200
+++ b/SConstruct	Thu Apr 10 23:20:36 2008 +0200
@@ -25,32 +25,116 @@
                      - everything but docs and downloadable models
 
 Default target is no-download.
+
+Options:
 """)
 
+import os, sys
+env = Environment(ENV = {'PATH' : os.environ['PATH']})
 Decider('MD5-timestamp')
-import os
-env = Environment(ENV = {'PATH' : os.environ['PATH']})
+
+opt = Options(['.optioncache'])
+opt.AddOptions(
+	BoolOption('intelc', 'use Intel C++ Compiler, if available', True),
+	('flags', 'add additional compiler flags', ""),
+)
+if env['PLATFORM'] == 'win32':
+	opt.AddOptions(
+		('pythonpath', 'path to Python installation',
+			'C:\\Python%c%c' % (sys.version[0], sys.version[2])),
+		)
+opt.Update(env)
+opt.Save('.optioncache', env)
+Help(opt.GenerateHelpText(env))
+
+if env['intelc']:
+	Tool("intelc")(env)
 
-### GNU C++ Compiler
-#env.Replace(CXX="g++")
-#env.Append(CCFLAGS="-O3 -Wall -pipe -ffast-math -msse3 ")
+platform = 'unknown'
+def CheckPlatform(context):
+	global platform
+	context.Message('Platform is... ')
+	if sys.platform[:5] == 'linux':
+		platform = 'linux'
+	elif env['PLATFORM'] == 'posix':
+		platform = 'posix'
+	elif env['PLATFORM'] == 'win32':
+		platform = 'win32'
+	context.Result(platform)
+	return True
+
+cpu = 'unknown'
+def CheckCPU(context):
+	global cpu, platform
+	context.Message('Checking CPU model... ')
+	if (platform == 'linux'):
+		if (os.system("cat /proc/cpuinfo | grep 'Core(TM)2 CPU' >/dev/null") == 0):
+			cpu = 'core2'
+	context.Result(cpu)
+	return True
 
-### Intel C++ Compiler
-env.Replace(CXX="icpc")
-env.Append(CCFLAGS="-O3 -w1 -mtune=core2 -xT ")
+def CheckIntelC(context):
+	global intelc
+	context.Message('Checking for Intel C++ Compiler... ')
+	intelc = "intelc" in env['TOOLS']
+	context.Result(intelc)
+	return intelc
+
+def CheckGCC(context):
+	global gcc, gccversion
+	context.Message('Checking for GCC... ')
+	gcc = "g++" in env['TOOLS']
+	if gcc:
+		gccversion = os.popen("g++ --version").read().split()[2]
+		context.Result(gccversion)
+	else:
+		context.Result(False)
+	return gcc
+
+conf = Configure(env,
+	custom_tests = {
+		'CheckPlatform' : CheckPlatform, 'CheckCPU' : CheckCPU,
+		'CheckIntelC' : CheckIntelC, 'CheckGCC' : CheckGCC})
+conf.CheckPlatform()
+conf.CheckCPU()
+conf.CheckGCC()
+conf.CheckIntelC()
+env = conf.Finish()
 
-### MinGW32
-#  PY_CCFLAGS=-I"C:\Program Files\Python25\include"
-#  PY_LDFLAGS=-L"C:\Program Files\Python25\libs" -lpython25
+if intelc:
+	cc = 'intelc'
+elif gcc:
+	cc = 'gcc'
+
+cpu_flags = ''
+if cc == 'gcc':
+	cpu_flags += '-ffast-math '
+if cpu == 'core2':
+	if (cc == 'intelc' or gccversion[:3] == '4.3'):
+		cpu_flags += '-march=core2 -mtune=core2 '
+	if cc == 'intelc':
+		cpu_flags += '-xT '
+	if cc == 'gcc':
+		cpu_flags += '-msse3 -mfpmath=sse '
+cpu_flags += env['flags']
+
+if intelc:
+	env.Append(CCFLAGS="-O3 -w1 " + cpu_flags)
+elif gcc:
+	env.Append(CCFLAGS="-O3 -Wall -pipe " + cpu_flags)
+	# CCFLAGS= -fno-strict-aliasing
+else:
+	print "No supported compiler found."
+	Exit(1)
+
+print "Additional compiler flags: " + cpu_flags
 
 # pthread
 if env['PLATFORM'] == 'win32':
-	env.Append(LINKFLAGS="-lpthreadGC2 ")
+	env.Append(LIBS=["pthreadGC2"])
 else:
 	env.Append(CCFLAGS="-pthread ")
 
-# CCFLAGS=-g -fno-strict-aliasing
-
 # float: -fsingle-precision-constant
 # double: -DPYRIT_DOUBLE
 (lib, pymodule) = SConscript('src/SConscript', build_dir='build/lib', duplicate=0, exports='env')