/usr/share/boost-build/src/tools
Edit: /usr/share/boost-build/src/tools/cast.jam (3237B)
# Copyright 2005 Vladimir Prus.
# Distributed under the Boost Software License, Version 1.0. (See
# accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
# Defines main target 'cast', used to change type for target. For example, in Qt
# library one wants two kinds of CPP files -- those that just compiled and those
# that are passed via the MOC tool.
#
# This is done with:
#
# exe main : main.cpp [ cast _ moccable-cpp : widget.cpp ] ;
#
# B2 will assign target type CPP to both main.cpp and widget.cpp. Then,
# the cast rule will change target type of widget.cpp to MOCCABLE-CPP, and Qt
# support will run the MOC tool as part of the build process.
#
# At the moment, the 'cast' rule only works for non-derived (source) targets.
#
# TODO: The following comment is unclear or incorrect. Clean it up.
# > Another solution would be to add a separate main target 'moc-them' that
# > would moc all the passed sources, no matter what their type is, but I prefer
# > cast, as defining a new target type + generator for that type is somewhat
# > simpler than defining a main target rule.
import "class" : new ;
import project ;
import property-set ;
import targets ;
import type ;
class cast-target-class : typed-target
{
import type ;
rule __init__ ( name : project : type : sources * : requirements * :
default-build * : usage-requirements * )
{
typed-target.__init__ $(name) : $(project) : $(type) : $(sources) :
$(requirements) : $(default-build) : $(usage-requirements) ;
}
rule construct ( name : source-targets * : property-set )
{
local result ;
for local s in $(source-targets)
{
if ! [ class.is-a $(s) : file-target ]
{
import errors : user-error : errors.user-error ;
errors.user-error Source to the 'cast' rule is not a file! ;
}
if [ $(s).action ]
{
import errors : user-error : errors.user-error ;
errors.user-error Only non-derived target are allowed for
'cast'. : when building [ full-name ] ;
}
local r = [ $(s).clone-with-different-type $(self.type) ] ;
result += [ virtual-target.register $(r) ] ;
}
return [ property-set.empty ] $(result) ;
}
}
rule cast ( name type : sources * : requirements * : default-build * :
usage-requirements * )
{
local project = [ project.current ] ;
local real-type = [ type.type-from-rule-name $(type) ] ;
if ! $(real-type)
{
import errors ;
errors.user-error No type corresponds to the main target rule name
'$(type)' : "Hint: try a lowercase name" ;
}
targets.main-target-alternative [ new cast-target-class $(name) : $(project)
: $(real-type)
: [ targets.main-target-sources $(sources) : $(name) ]
: [ targets.main-target-requirements $(requirements) : $(project) ]
: [ targets.main-target-default-build $(default-build) : $(project) ]
: [ targets.main-target-usage-requirements $(usage-requirements) :
$(project) ] ] ;
}
IMPORT $(__name__) : cast : : cast ;