path: root/buildtools/wafsamba/wafsamba.py

# a waf tool to add autoconf-like macros to the configure section
# and for SAMBA_ macros for building libraries, binaries etc

import Build, os, Options, Task, Utils, cc, TaskGen, fnmatch, re, shutil, Logs, Constants
from Configure import conf
from Logs import debug
from samba_utils import SUBST_VARS_RECURSIVE

# bring in the other samba modules
from samba_optimisation import *
from samba_utils import *
from samba_autoconf import *
from samba_patterns import *
from samba_pidl import *
from samba_errtable import *
from samba_asn1 import *
from samba_autoproto import *
from samba_python import *
from samba_deps import *
from samba_bundled import *
import samba_install
import samba_conftests
import samba_abi
import tru64cc
import irixcc
import generic_cc
import samba_dist
import samba_wildcard

O644 = 420

# some systems have broken threading in python
if os.environ.get('WAF_NOTHREADS') == '1':
    import nothreads

LIB_PATH="shared"

os.putenv('PYTHONUNBUFFERED', '1')


if Constants.HEXVERSION < 0x105016:
    Logs.error('''
Please use the version of waf that comes with Samba, not
a system installed version. See http://wiki.samba.org/index.php/Waf
for details.

Alternatively, please use ./autogen-waf.sh, and then
run ./configure and make as usual. That will call the right version of waf.
''')
    sys.exit(1)


@conf
def SAMBA_BUILD_ENV(conf):
    '''create the samba build environment'''
    conf.env.BUILD_DIRECTORY = conf.blddir
    mkdir_p(os.path.join(conf.blddir, LIB_PATH))
    mkdir_p(os.path.join(conf.blddir, 'python/samba/dcerpc'))
    # this allows all of the bin/shared and bin/python targets
    # to be expressed in terms of build directory paths
    mkdir_p(os.path.join(conf.blddir, 'default'))
    for p in ['python','shared']:
        link_target = os.path.join(conf.blddir, 'default/' + p)
        if not os.path.lexists(link_target):
            os.symlink('../' + p, link_target)

    # get perl to put the blib files in the build directory
    blib_bld = os.path.join(conf.blddir, 'default/pidl/blib')
    blib_src = os.path.join(conf.srcdir, 'pidl/blib')
    mkdir_p(blib_bld + '/man1')
    mkdir_p(blib_bld + '/man3')
    if os.path.islink(blib_src):
        os.unlink(blib_src)
    elif os.path.exists(blib_src):
        shutil.rmtree(blib_src)


def ADD_INIT_FUNCTION(bld, subsystem, target, init_function):
    '''add an init_function to the list for a subsystem'''
    if init_function is None:
        return
    bld.ASSERT(subsystem is not None, "You must specify a subsystem for init_function '%s'" % init_function)
    cache = LOCAL_CACHE(bld, 'INIT_FUNCTIONS')
    if not subsystem in cache:
        cache[subsystem] = []
    cache[subsystem].append( { 'TARGET':target, 'INIT_FUNCTION':init_function } )
Build.BuildContext.ADD_INIT_FUNCTION = ADD_INIT_FUNCTION



#################################################################
def SAMBA_LIBRARY(bld, libname, source,
                  deps='',
                  public_deps='',
                  includes='',
                  public_headers=None,
                  header_path=None,
                  pc_files=None,
                  vnum=None,
                  cflags='',
                  external_library=False,
                  realname=None,
                  autoproto=None,
                  group='main',
                  depends_on='',
                  local_include=True,
                  vars=None,
                  install_path=None,
                  install=True,
                  needs_python=False,
                  target_type='LIBRARY',
                  bundled_extension=True,
                  link_name=None,
                  abi_file=None,
                  abi_match=None,
                  hide_symbols=False,
                  enabled=True):
    '''define a Samba library'''

    if not enabled:
        SET_TARGET_TYPE(bld, libname, 'DISABLED')
        return

    source = bld.EXPAND_VARIABLES(source, vars=vars)

    # remember empty libraries, so we can strip the dependencies
    if ((source == '') or (source == [])) and deps == '' and public_deps == '':
        SET_TARGET_TYPE(bld, libname, 'EMPTY')
        return

    if target_type != 'PYTHON' and BUILTIN_LIBRARY(bld, libname):
        obj_target = libname
    else:
        obj_target = libname + '.objlist'

    # first create a target for building the object files for this library
    # by separating in this way, we avoid recompiling the C files
    # separately for the install library and the build library
    bld.SAMBA_SUBSYSTEM(obj_target,
                        source         = source,
                        deps           = deps,
                        public_deps    = public_deps,
                        includes       = includes,
                        public_headers = public_headers,
                        header_path    = header_path,
                        cflags         = cflags,
                        group          = group,
                        autoproto      = autoproto,
                        depends_on     = depends_on,
                        needs_python   = needs_python,
                        hide_symbols   = hide_symbols,
                        local_include  = local_include)

    if libname == obj_target:
        return

    if not SET_TARGET_TYPE(bld, libname, target_type):
        return

    # the library itself will depend on that object target
    deps += ' ' + public_deps
    deps = TO_LIST(deps)
    deps.append(obj_target)

    if target_type == 'PYTHON' or realname:
        bundled_name = libname
    else:
        bundled_name = BUNDLED_NAME(bld, libname, bundled_extension)

    features = 'cc cshlib symlink_lib install_lib'
    if target_type == 'PYTHON':
        features += ' pyext'
    elif needs_python:
        features += ' pyembed'
    if abi_file:
        features += ' abi_check'

    if abi_file:
        abi_file = os.path.join(bld.curdir, abi_file)

    bld.SET_BUILD_GROUP(group)
    t = bld(
        features        = features,
        source          = [],
        target          = bundled_name,
        samba_cflags    = CURRENT_CFLAGS(bld, libname, cflags),
        depends_on      = depends_on,
        samba_deps      = deps,
        samba_includes  = includes,
        local_include   = local_include,
        vnum            = vnum,
        install_path    = None,
        samba_inst_path = install_path,
        name	        = libname,
        samba_realname  = realname,
        samba_install   = install,
        abi_file        = abi_file,
        abi_match       = abi_match
        )

    if realname and not link_name:
        link_name = 'shared/%s' % realname

    if link_name:
        t.link_name = link_name

    if pc_files is not None:
        bld.PKG_CONFIG_FILES(pc_files, vnum=vnum)

Build.BuildContext.SAMBA_LIBRARY = SAMBA_LIBRARY


#################################################################
def SAMBA_BINARY(bld, binname, source,
                 deps='',
                 includes='',
                 public_headers=None,
                 header_path=None,
                 modules=None,
                 ldflags=None,
                 cflags='',
                 autoproto=None,
                 use_hostcc=False,
                 use_global_deps=True,
                 compiler=None,
                 group='binaries',
                 manpages=None,
                 local_include=True,
                 subsystem_name=None,
                 needs_python=False,
                 vars=None,
                 install=True,
                 install_path=None,
                 enabled=True):
    '''define a Samba binary'''

    if not enabled:
        SET_TARGET_TYPE(bld, binname, 'DISABLED')
        return

    if not SET_TARGET_TYPE(bld, binname, 'BINARY'):
        return

    features = 'cc cprogram symlink_bin install_bin'
    if needs_python:
        features += ' pyembed'

    obj_target = binname + '.objlist'

    source = bld.EXPAND_VARIABLES(source, vars=vars)
    source = unique_list(TO_LIST(source))

    # first create a target for building the object files for this binary
    # by separating in this way, we avoid recompiling the C files
    # separately for the install binary and the build binary
    bld.SAMBA_SUBSYSTEM(obj_target,
                        source         = source,
                        deps           = deps,
                        includes       = includes,
                        cflags         = cflags,
                        group          = group,
                        autoproto      = autoproto,
                        subsystem_name = subsystem_name,
                        needs_python   = needs_python,
                        local_include  = local_include,
                        use_hostcc     = use_hostcc,
                        use_global_deps= use_global_deps)

    bld.SET_BUILD_GROUP(group)

    # the binary itself will depend on that object target
    deps = TO_LIST(deps)
    deps.append(obj_target)

    t = bld(
        features       = features,
        source         = [],
        target         = binname,
        samba_cflags   = CURRENT_CFLAGS(bld, binname, cflags),
        samba_deps     = deps,
        samba_includes = includes,
        local_include  = local_include,
        samba_modules  = modules,
        top            = True,
        samba_subsystem= subsystem_name,
        install_path   = None,
        samba_inst_path= install_path,
        samba_install  = install
        )

    # setup the subsystem_name as an alias for the real
    # binary name, so it can be found when expanding
    # subsystem dependencies
    if subsystem_name is not None:
        bld.TARGET_ALIAS(subsystem_name, binname)

Build.BuildContext.SAMBA_BINARY = SAMBA_BINARY


#################################################################
def SAMBA_MODULE(bld, modname, source,
                 deps='',
                 includes='',
                 subsystem=None,
                 init_function=None,
                 autoproto=None,
                 autoproto_extra_source='',
                 aliases=None,
                 cflags='',
                 internal_module=True,
                 local_include=True,
                 vars=None,
                 enabled=True):
    '''define a Samba module.'''

    # we add the init function regardless of whether the module
    # is enabled or not, as we need to generate a null list if
    # all disabled
    bld.ADD_INIT_FUNCTION(subsystem, modname, init_function)

    if internal_module or BUILTIN_LIBRARY(bld, modname):
        # treat internal modules as subsystems for now
        SAMBA_SUBSYSTEM(bld, modname, source,
                        deps=deps,
                        includes=includes,
                        autoproto=autoproto,
                        autoproto_extra_source=autoproto_extra_source,
                        cflags=cflags,
                        local_include=local_include,
                        enabled=enabled)
        return

    if not enabled:
        SET_TARGET_TYPE(bld, modname, 'DISABLED')
        return

    source = bld.EXPAND_VARIABLES(source, vars=vars)
    source = unique_list(TO_LIST(source))

    # remember empty modules, so we can strip the dependencies
    if ((source == '') or (source == [])) and deps == '' and public_deps == '':
        SET_TARGET_TYPE(bld, modname, 'EMPTY')
        return

    if not SET_TARGET_TYPE(bld, modname, 'MODULE'):
        return

    if subsystem is not None:
        deps += ' ' + subsystem

    bld.SET_BUILD_GROUP('main')
    bld(
        features       = 'cc',
        source         = source,
        target         = modname,
        samba_cflags   = CURRENT_CFLAGS(bld, modname, cflags),
        samba_includes = includes,
        local_include  = local_include,
        samba_deps     = TO_LIST(deps)
        )

    if autoproto is not None:
        bld.SAMBA_AUTOPROTO(autoproto, source + TO_LIST(autoproto_extra_source))

Build.BuildContext.SAMBA_MODULE = SAMBA_MODULE


#################################################################
def SAMBA_SUBSYSTEM(bld, modname, source,
                    deps='',
                    public_deps='',
                    includes='',
                    public_headers=None,
                    header_path=None,
                    cflags='',
                    cflags_end=None,
                    group='main',
                    init_function_sentinal=None,
                    heimdal_autoproto=None,
                    heimdal_autoproto_options=None,
                    heimdal_autoproto_private=None,
                    autoproto=None,
                    autoproto_extra_source='',
                    depends_on='',
                    local_include=True,
                    local_include_first=True,
                    subsystem_name=None,
                    enabled=True,
                    use_hostcc=False,
                    use_global_deps=True,
                    vars=None,
                    hide_symbols=False,
                    needs_python=False):
    '''define a Samba subsystem'''

    if not enabled:
        SET_TARGET_TYPE(bld, modname, 'DISABLED')
        return

    # remember empty subsystems, so we can strip the dependencies
    if ((source == '') or (source == [])) and deps == '' and public_deps == '':
        SET_TARGET_TYPE(bld, modname, 'EMPTY')
        return

    if not SET_TARGET_TYPE(bld, modname, 'SUBSYSTEM'):
        return

    source = bld.EXPAND_VARIABLES(source, vars=vars)
    source = unique_list(TO_LIST(source))

    deps += ' ' + public_deps

    bld.SET_BUILD_GROUP(group)

    features = 'cc'
    if needs_python:
        features += ' pyext'

    t = bld(
        features       = features,
        source         = source,
        target         = modname,
        samba_cflags   = CURRENT_CFLAGS(bld, modname, cflags, hide_symbols=hide_symbols),
        depends_on     = depends_on,
        samba_deps     = TO_LIST(deps),
        samba_includes = includes,
        local_include  = local_include,
        local_include_first  = local_include_first,
        samba_subsystem= subsystem_name,
        samba_use_hostcc = use_hostcc,
        samba_use_global_deps = use_global_deps
        )

    if cflags_end is not None:
        t.samba_cflags.extend(TO_LIST(cflags_end))

    if heimdal_autoproto is not None:
        bld.HEIMDAL_AUTOPROTO(heimdal_autoproto, source, options=heimdal_autoproto_options)
    if heimdal_autoproto_private is not None:
        bld.HEIMDAL_AUTOPROTO_PRIVATE(heimdal_autoproto_private, source)
    if autoproto is not None:
        bld.SAMBA_AUTOPROTO(autoproto, source + TO_LIST(autoproto_extra_source))
    if public_headers is not None:
        bld.PUBLIC_HEADERS(public_headers, header_path=header_path)
    return t


Build.BuildContext.SAMBA_SUBSYSTEM = SAMBA_SUBSYSTEM


def SAMBA_GENERATOR(bld, name, rule, source='', target='',
                    group='generators', enabled=True,
                    public_headers=None,
                    header_path=None,
                    vars=None):
    '''A generic source generator target'''

    if not SET_TARGET_TYPE(bld, name, 'GENERATOR'):
        return

    if not enabled:
        return

    bld.SET_BUILD_GROUP(group)
    t = bld(
        rule=rule,
        source=bld.EXPAND_VARIABLES(source, vars=vars),
        target=target,
        shell=isinstance(rule, str),
        on_results=True,
        before='cc',
        ext_out='.c',
        name=name)

    if public_headers is not None:
        bld.PUBLIC_HEADERS(public_headers, header_path=header_path)
    return t
Build.BuildContext.SAMBA_GENERATOR = SAMBA_GENERATOR



@runonce
def SETUP_BUILD_GROUPS(bld):
    '''setup build groups used to ensure that the different build
    phases happen consecutively'''
    bld.p_ln = bld.srcnode # we do want to see all targets!
    bld.env['USING_BUILD_GROUPS'] = True
    bld.add_group('setup')
    bld.add_group('build_compiler_source')
    bld.add_group('base_libraries')
    bld.add_group('generators')
    bld.add_group('compiler_prototypes')
    bld.add_group('compiler_libraries')
    bld.add_group('build_compilers')
    bld.add_group('build_source')
    bld.add_group('prototypes')
    bld.add_group('main')
    bld.add_group('binaries')
    bld.add_group('final')
Build.BuildContext.SETUP_BUILD_GROUPS = SETUP_BUILD_GROUPS


def SET_BUILD_GROUP(bld, group):
    '''set the current build group'''
    if not 'USING_BUILD_GROUPS' in bld.env:
        return
    bld.set_group(group)
Build.BuildContext.SET_BUILD_GROUP = SET_BUILD_GROUP



@conf
def ENABLE_TIMESTAMP_DEPENDENCIES(conf):
    """use timestamps instead of file contents for deps
    this currently doesn't work"""
    def h_file(filename):
        import stat
        st = os.stat(filename)
        if stat.S_ISDIR(st[stat.ST_MODE]): raise IOError('not a file')
        m = Utils.md5()
        m.update(str(st.st_mtime))
        m.update(str(st.st_size))
        m.update(filename)
        return m.digest()
    Utils.h_file = h_file



t = Task.simple_task_type('copy_script', 'rm -f ${LINK_TARGET} && ln -s ${SRC[0].abspath(env)} ${LINK_TARGET}',
                          shell=True, color='PINK', ext_in='.bin')
t.quiet = True

@feature('copy_script')
@before('apply_link')
def copy_script(self):
    tsk = self.create_task('copy_script', self.allnodes[0])
    tsk.env.TARGET = self.target

def SAMBA_SCRIPT(bld, name, pattern, installdir, installname=None):
    '''used to copy scripts from the source tree into the build directory
       for use by selftest'''

    source = bld.path.ant_glob(pattern)

    bld.SET_BUILD_GROUP('build_source')
    for s in TO_LIST(source):
        iname = s
        if installname != None:
            iname = installname
        target = os.path.join(installdir, iname)
        tgtdir = os.path.dirname(os.path.join(bld.srcnode.abspath(bld.env), '..', target))
        mkdir_p(tgtdir)
        t = bld(features='copy_script',
                source       = s,
                target       = target,
                always       = True,
                install_path = None)
        t.env.LINK_TARGET = target

Build.BuildContext.SAMBA_SCRIPT = SAMBA_SCRIPT


def install_file(bld, destdir, file, chmod=O644, flat=False,
                 python_fixup=False, destname=None, base_name=None):
    '''install a file'''
    destdir = bld.EXPAND_VARIABLES(destdir)
    if not destname:
        destname = file
        if flat:
            destname = os.path.basename(destname)
    dest = os.path.join(destdir, destname)
    if python_fixup:
        # fixup the python path it will use to find Samba modules
        inst_file = file + '.inst'
        bld.SAMBA_GENERATOR('python_%s' % destname,
                            rule="sed 's|\(sys.path.insert.*\)bin/python\(.*\)$|\\1${PYTHONDIR}\\2|g' < ${SRC} > ${TGT}",
                            source=file,
                            target=inst_file)
        file = inst_file
    if base_name:
        file = os.path.join(base_name, file)
    bld.install_as(dest, file, chmod=chmod)


def INSTALL_FILES(bld, destdir, files, chmod=O644, flat=False,
                  python_fixup=False, destname=None, base_name=None):
    '''install a set of files'''
    for f in TO_LIST(files):
        install_file(bld, destdir, f, chmod=chmod, flat=flat,
                     python_fixup=python_fixup, destname=destname,
                     base_name=base_name)
Build.BuildContext.INSTALL_FILES = INSTALL_FILES


def INSTALL_WILDCARD(bld, destdir, pattern, chmod=O644, flat=False,
                     python_fixup=False, exclude=None, trim_path=None):
    '''install a set of files matching a wildcard pattern'''
    files=TO_LIST(bld.path.ant_glob(pattern))
    if trim_path:
        files2 = []
        for f in files:
            files2.append(os_path_relpath(f, trim_path))
        files = files2

    if exclude:
        for f in files[:]:
            if fnmatch.fnmatch(f, exclude):
                files.remove(f)
    INSTALL_FILES(bld, destdir, files, chmod=chmod, flat=flat,
                  python_fixup=python_fixup, base_name=trim_path)
Build.BuildContext.INSTALL_WILDCARD = INSTALL_WILDCARD


def INSTALL_DIRS(bld, destdir, dirs):
    '''install a set of directories'''
    destdir = bld.EXPAND_VARIABLES(destdir)
    dirs = bld.EXPAND_VARIABLES(dirs)
    for d in TO_LIST(dirs):
        bld.install_dir(os.path.join(destdir, d))
Build.BuildContext.INSTALL_DIRS = INSTALL_DIRS


re_header = re.compile('#include[ \t]*"([^"]+)"', re.I | re.M)
class header_task(Task.Task):
    name = 'header'
    color = 'PINK'
    vars = ['INCLUDEDIR', 'HEADER_DEPS']
    def run(self):
        txt = self.inputs[0].read(self.env)

        txt = txt.replace('#if _SAMBA_BUILD_ == 4', '#if 1\n')

        themap = self.generator.bld.subst_table
        def repl(m):
            if m.group(1):
                s = m.group(1)
                return "#include <%s>" % themap.get(s, s)
            return ''

        txt = re_header.sub(repl, txt)

        f = None
        try:
            f = open(self.outputs[0].abspath(self.env), 'w')
            f.write(txt)
        finally:
            if f:
                f.close()

def init_subst(bld):
    """
    initialize the header substitution table
    for now use the file headermap.txt but in the future we will compute the paths properly
    """

    if getattr(bld, 'subst_table', None):
        return bld.subst_table_h

    node = bld.srcnode.find_resource("source4/headermap.txt")
    if not node:
        return {}
    lines = node.read(None)
    bld.subst_table_h = hash(lines)
    lines = [x.strip().split(': ') for x in lines.split('\n') if x.rfind(': ') > -1]
    bld.subst_table = dict(lines)
    return bld.subst_table_h

@TaskGen.feature('pubh')
def make_public_headers(self):
    if not self.bld.is_install:
        # install time only (lazy)
        return

    self.env['HEADER_DEPS'] = init_subst(self.bld)
    # adds a dependency and trigger a rebuild if the dict changes

    header_path = getattr(self, 'header_path', None) or ''

    for x in self.to_list(self.headers):

        # too complicated, but what was the original idea?
        if isinstance(header_path, list):
            add_dir = ''
            for (p1, dir) in header_path:
                lst = self.to_list(p1)
                for p2 in lst:
                    if fnmatch.fnmatch(x, p2):
                        add_dir = dir
                        break
                else:
                    continue
                break
            inst_path = add_dir
        else:
            inst_path = header_path

        dest = ''
        name = x
        if x.find(':') != -1:
            s = x.split(':')
            name = s[0]
            dest = s[1]

        inn = self.path.find_resource(name)
        if not inn:
            raise ValueError("could not find the public header %r in %r" % (name, self.path))
        out = inn.change_ext('.inst.h')
        self.create_task('header', inn, out)

        if not dest:
            dest = inn.name

        if inst_path:
            inst_path = inst_path + '/'
        inst_path = inst_path + dest

        #print("going to install the headers", inst_path, out)
        self.bld.install_as('${INCLUDEDIR}/%s' % inst_path, out, self.env)

def PUBLIC_HEADERS(bld, public_headers, header_path=None):
    '''install some headers

    header_path may either be a string that is added to the INCLUDEDIR,
    or it can be a dictionary of wildcard patterns which map to destination
    directories relative to INCLUDEDIR
    '''
    bld.SET_BUILD_GROUP('final')
    ret = bld(features=['pubh'], headers=public_headers, header_path=header_path)
    return ret
Build.BuildContext.PUBLIC_HEADERS = PUBLIC_HEADERS


def subst_at_vars(task):
    '''substiture @VAR@ style variables in a file'''
    src = task.inputs[0].srcpath(task.env)
    tgt = task.outputs[0].bldpath(task.env)

    f = open(src, 'r')
    s = f.read()
    f.close()
    # split on the vars
    a = re.split('(@\w+@)', s)
    out = []
    done_var = {}
    back_sub = [ ('PREFIX', '${prefix}'), ('EXEC_PREFIX', '${exec_prefix}')]
    for v in a:
        if re.match('@\w+@', v):
            vname = v[1:-1]
            if not vname in task.env and vname.upper() in task.env:
                vname = vname.upper()
            if not vname in task.env:
                Logs.error("Unknown substitution %s in %s" % (v, task.name))
                sys.exit(1)
            v = SUBST_VARS_RECURSIVE(task.env[vname], task.env)
            # now we back substitute the allowed pc vars
            for (b, m) in back_sub:
                s = task.env[b]
                if s == v[0:len(s)]:
                    if not b in done_var:
                        # we don't want to substitute the first usage
                        done_var[b] = True
                    else:
                        v = m + v[len(s):]
                    break
        out.append(v)
    contents = ''.join(out)
    f = open(tgt, 'w')
    s = f.write(contents)
    f.close()
    return 0



def PKG_CONFIG_FILES(bld, pc_files, vnum=None):
    '''install some pkg_config pc files'''
    dest = '${PKGCONFIGDIR}'
    dest = bld.EXPAND_VARIABLES(dest)
    for f in TO_LIST(pc_files):
        base=os.path.basename(f)
        t = bld.SAMBA_GENERATOR('PKGCONFIG_%s' % base,
                                rule=subst_at_vars,
                                source=f+'.in',
                                target=f)
        if vnum:
            t.env.PACKAGE_VERSION = vnum
        INSTALL_FILES(bld, dest, f, flat=True, destname=base)
Build.BuildContext.PKG_CONFIG_FILES = PKG_CONFIG_FILES



#############################################################
# give a nicer display when building different types of files
def progress_display(self, msg, fname):
    col1 = Logs.colors(self.color)
    col2 = Logs.colors.NORMAL
    total = self.position[1]
    n = len(str(total))
    fs = '[%%%dd/%%%dd] %s %%s%%s%%s\n' % (n, n, msg)
    return fs % (self.position[0], self.position[1], col1, fname, col2)

def link_display(self):
    if Options.options.progress_bar != 0:
        return Task.Task.old_display(self)
    fname = self.outputs[0].bldpath(self.env)
    return progress_display(self, 'Linking', fname)
Task.TaskBase.classes['cc_link'].display = link_display

def samba_display(self):
    if Options.options.progress_bar != 0:
        return Task.Task.old_display(self)

    targets    = LOCAL_CACHE(self, 'TARGET_TYPE')
    if self.name in targets:
        target_type = targets[self.name]
        type_map = { 'GENERATOR' : 'Generating',
                     'PROTOTYPE' : 'Generating'
                     }
        if target_type in type_map:
            return progress_display(self, type_map[target_type], self.name)

    fname = self.inputs[0].bldpath(self.env)
    if fname[0:3] == '../':
        fname = fname[3:]
    ext_loc = fname.rfind('.')
    if ext_loc == -1:
        return Task.Task.old_display(self)
    ext = fname[ext_loc:]

    ext_map = { '.idl' : 'Compiling IDL',
                '.et'  : 'Compiling ERRTABLE',
                '.asn1': 'Compiling ASN1',
                '.c'   : 'Compiling' }
    if ext in ext_map:
        return progress_display(self, ext_map[ext], fname)
    return Task.Task.old_display(self)

Task.TaskBase.classes['Task'].old_display = Task.TaskBase.classes['Task'].display
Task.TaskBase.classes['Task'].display = samba_display