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# Copyright 2003, 2004, 2006 Vladimir Prus
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
# Status: ported (danielw)
# Base revision: 56043
# This module defines the 'alias' rule and associated class.
#
# Alias is just a main target which returns its source targets without any
# processing. For example::
#
# alias bin : hello test_hello ;
# alias lib : helpers xml_parser ;
#
# Another important use of 'alias' is to conveniently group source files::
#
# alias platform-src : win.cpp : <os>NT ;
# alias platform-src : linux.cpp : <os>LINUX ;
# exe main : main.cpp platform-src ;
#
# Lastly, it's possible to create local alias for some target, with different
# properties::
#
# alias big_lib : : @/external_project/big_lib/<link>static ;
#
import targets
import property_set
from b2.manager import get_manager
from b2.util import metatarget
class AliasTarget(targets.BasicTarget):
def __init__(self, *args):
targets.BasicTarget.__init__(self, *args)
def construct(self, name, source_targets, properties):
return [property_set.empty(), source_targets]
def compute_usage_requirements(self, subvariant):
base = targets.BasicTarget.compute_usage_requirements(self, subvariant)
# Add source's usage requirement. If we don't do this, "alias" does not
# look like 100% alias.
return base.add(subvariant.sources_usage_requirements())
@metatarget
def alias(name, sources=[], requirements=[], default_build=[], usage_requirements=[]):
project = get_manager().projects().current()
targets = get_manager().targets()
targets.main_target_alternative(AliasTarget(
name, project,
targets.main_target_sources(sources, name, no_renaming=True),
targets.main_target_requirements(requirements or [], project),
targets.main_target_default_build(default_build, project),
targets.main_target_usage_requirements(usage_requirements or [], project)))
# Declares the 'alias' target. It will build sources, and return them unaltered.
get_manager().projects().add_rule("alias", alias)
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