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