source: trunk/scons/utils.py

import sys
import os
import glob
import re
import platform

def get_libdir():
    import distutils.sysconfig
    return os.path.basename(distutils.sysconfig.get_config_var('LIBDIR'))

LIBDIR = "lib" #get_libdir()

def generate(env):

    def SGlob(pattern, excludedirs=[], recursive=False):
        # always exclude .svn
        excludedirs.append(".svn")
        path = env.GetBuildPath('SConscript').replace('SConscript', '') 
        if recursive:
            # remove '*' from pattern is accidentally specified
            pattern=pattern.replace("*", "")
            out = []
            for d, ld, fls in os.walk(path):
                # remove directorys to be excluded 
                for exd in excludedirs:
                    if exd in ld:
                        ld.remove(exd)
                for f in fls:               
                    if f.endswith(pattern):
                        drel=d.replace(path,"")
                        out.append(os.path.join(drel,f))
            return out
        else:
            return [ i.replace(path, '') for i in  glob.glob(path + pattern) ]
    env.SGlob = SGlob

    def AddCustomPath(path=None):
        if path is None or not os.path.exists(path):
            env.Exit(1)
        env.PrependUnique(CPPPATH = [os.path.join(path, "include")])
        env.PrependUnique(LIBPATH = [os.path.join(path, LIBDIR)])
    env.AddCustomPath = AddCustomPath

    def AddCustomPackage(pkgname=None):
        if pkgname is None:
            return
        pkgroot = env.get("%sroot" % pkgname, None)
        pkgincd = env.get("%sincdir" % pkgname, None)
        pkglibd = env.get("%slibdir" % pkgname, None)
        incd = None
        libd = None
        if pkgroot is not None:
            incd = os.path.join(pkgroot, "include")
            libd = os.path.join(pkgroot, LIBDIR)
        else:       
            if pkgincd is not None:
                incd = pkgincd
            if pkglibd is not None:
                libd = pkglibd
        if incd is not None:
            if not os.path.exists(incd):
                print "Custom %s include dir '%s' not found" % (pkgname, incd)
                env.Exit(1)
            env.PrependUnique(CPPPATH = [incd])
        if libd is not None:
            if not os.path.exists(libd):
                print "Custom %s lib dir '%s' not found" % (pkgname, libd)
                env.Exit(1)
            env.PrependUnique(LIBPATH = [libd])

    env.AddCustomPackage = AddCustomPackage

    def PlatformIdent():
        p = sys.platform
        # replace the trailing 2 in linux2
        p = re.sub(re.compile("2$"), "", p)
        return p + "_" + platform.machine()
    env.PlatformIdent = PlatformIdent

    def MergeFlags():
        def _to_list(xf):
            if xf.count(","):
                return xf.split(",")
            return xf.split()

        xf=env.get("extracppflags", None)
        if xf:
            env.AppendUnique(CPPFLAGS=_to_list(xf))
        xf=env.get("extralinkflags", None)
        if xf:
            env.AppendUnique(LINKFLAGS=_to_list(xf))
            env.AppendUnique(SHLINKFLAGS=_to_list(xf))
        xf=env.get("extracxxflags", None)
        if xf:
            env.AppendUnique(CXXFLAGS=_to_list(xf))
        xf=env.get("extrafflags", None)
        if xf:
            env.AppendUnique(FORTRANFLAGS=_to_list(xf))
            env.AppendUnique(SHFORTRANFLAGS=_to_list(xf))
        xf=env.get("extracflags", None)
        if xf:
            env.AppendUnique(CCFLAGS=_to_list(xf))
    # set the extra flags if available
    MergeFlags()
        
    def CheckFortran(conf):
        
        def getf2clib(fc):
            fdict = {'gfortran': 'gfortran', 'g77': 'g2c', 'f77': 'f2c'}
            return fdict[fc]

        
        if not conf.env.has_key("FORTRAN"):
            # auto-detect fortran
            detect_fortran = conf.env.Detect(['gfortran', 'g77', 'f77'])
            conf.env["FORTRAN"] = detect_fortran
        f2clib = conf.env.get("f2clib", getf2clib(conf.env["FORTRAN"]))
        if not conf.CheckLib(f2clib):
            conf.env.Exit(1)

        if conf.env["FORTRAN"].startswith("g77"):
            fflags = ["-Wno-globals", "-fno-second-underscore"]
            conf.env.AppendUnique(SHFORTRANFLAGS=fflags)
            conf.env.AppendUnique(FORTRANFLAGS=fflags)
        conf.env.AppendUnique(SHFORTRANFLAGS=['-fPIC'])

    env.CheckFortran = CheckFortran

    def WalkDirTree(targetroot, sourceroot, sources):
        ifiles = []
        ofiles = []
        for s in sources:
            if os.path.isdir(os.path.join(sourceroot ,s)):
                for d,ld,f in os.walk(os.path.join(sourceroot ,s)):
                    for fl in f:
                        ifile = os.path.join(d, fl)
                        ifiles.append(ifile)
                        ofile = ifile.replace(sourceroot, targetroot)
                        ofiles.append(ofile)
        return ofiles, ifiles
    env.WalkDirTree = WalkDirTree


    def null_action(target, source, env): return 0

    def message(target, source, env):
        return "%s" % target[0]
    env.MessageAction = env.Action(null_action, message)

def exists(env):
    try:
        import os
        import glob
    except ImportError:
        return False
    else:
        return True