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-# Copyright Vladimir Prus 2002.
-# Copyright Rene Rivera 2006.
-#
-# 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)
-
-# Supports 'abstract' targets, which are targets explicitly defined in a
-# Jamfile.
-#
-# Abstract targets are represented by classes derived from 'abstract-target'
-# class. The first abstract target is 'project-target', which is created for
-# each Jamfile, and can be obtained by the 'target' rule in the Jamfile's module
-# (see project.jam).
-#
-# Project targets keep a list of 'main-target' instances. A main target is what
-# the user explicitly defines in a Jamfile. It is possible to have several
-# definitions for a main target, for example to have different lists of sources
-# for different platforms. So, main targets keep a list of alternatives.
-#
-# Each alternative is an instance of 'abstract-target'. When a main target
-# subvariant is defined by some rule, that rule will decide what class to use,
-# create an instance of that class and add it to the list of alternatives for
-# the main target.
-#
-# Rules supplied by the build system will use only targets derived from
-# 'basic-target' class, which will provide some default behaviour. There will be
-# different classes derived from it such as 'make-target', created by the 'make'
-# rule, and 'typed-target', created by rules such as 'exe' and 'lib'.
-
-#
-# +------------------------+
-# |abstract-target |
-# +========================+
-# |name |
-# |project |
-# | |
-# |generate(properties) = 0|
-# +-----------+------------+
-# |
-# ^
-# / \
-# +-+-+
-# |
-# |
-# +------------------------+------+------------------------------+
-# | | |
-# | | |
-# +----------+-----------+ +------+------+ +------+-------+
-# | project-target | | main-target | | basic-target |
-# +======================+ 1 * +=============+ alternatives +==============+
-# | generate(properties) |o-----------+ generate |<>------------->| generate |
-# | main-target | +-------------+ | construct = 0|
-# +----------------------+ +--------------+
-# |
-# ^
-# / \
-# +-+-+
-# |
-# |
-# ...--+----------------+------------------+----------------+---+
-# | | | |
-# | | | |
-# ... ---+-----+ +------+-------+ +------+------+ +--------+-----+
-# | | typed-target | | make-target | | stage-target |
-# . +==============+ +=============+ +==============+
-# . | construct | | construct | | construct |
-# +--------------+ +-------------+ +--------------+
-
-import assert ;
-import "class" : new ;
-import errors ;
-import feature ;
-import indirect ;
-import path ;
-import property ;
-import property-set ;
-import sequence ;
-import set ;
-import toolset ;
-import build-request ;
-
-
-# Base class for all abstract targets.
-#
-class abstract-target
-{
- import project ;
- import assert ;
- import "class" ;
- import errors ;
-
- rule __init__ ( name # Name of the target in Jamfile.
- : project-target # The project target to which this one belongs.
- )
- {
- # Note: it might seem that we don't need either name or project at all.
- # However, there are places where we really need it. One example is
- # error messages which should name problematic targets. Another is
- # setting correct paths for sources and generated files.
-
- self.name = $(name) ;
- self.project = $(project-target) ;
- self.location = [ errors.nearest-user-location ] ;
- }
-
- # Returns the name of this target.
- rule name ( )
- {
- return $(self.name) ;
- }
-
- # Returns the project for this target.
- rule project ( )
- {
- return $(self.project) ;
- }
-
- # Return the location where the target was declared.
- rule location ( )
- {
- return $(self.location) ;
- }
-
- # Returns a user-readable name for this target.
- rule full-name ( )
- {
- local location = [ $(self.project).get location ] ;
- return $(location)/$(self.name) ;
- }
-
- # Generates virtual targets for this abstract target using the specified
- # properties, unless a different value of some feature is required by the
- # target.
- # On success, returns:
- # - a property-set with the usage requirements to be applied to dependants
- # - a list of produced virtual targets, which may be empty.
- # If 'property-set' is empty, performs the default build of this target, in
- # a way specific to the derived class.
- #
- rule generate ( property-set )
- {
- errors.error "method should be defined in derived classes" ;
- }
-
- rule rename ( new-name )
- {
- self.name = $(new-name) ;
- }
-}
-
-
-if --debug-building in [ modules.peek : ARGV ]
-{
- modules.poke : .debug-building : true ;
-}
-
-
-rule indent ( )
-{
- return $(.indent:J="") ;
-}
-
-
-rule increase-indent ( )
-{
- .indent += " " ;
-}
-
-
-rule decrease-indent ( )
-{
- .indent = $(.indent[2-]) ;
-}
-
-
-# Project target class (derived from 'abstract-target').
-#
-# This class has the following responsibilities:
-# - Maintaining a list of main targets in this project and building them.
-#
-# Main targets are constructed in two stages:
-# - When Jamfile is read, a number of calls to 'add-alternative' is made. At
-# that time, alternatives can also be renamed to account for inline targets.
-# - The first time 'main-target' or 'has-main-target' rule is called, all
-# alternatives are enumerated and main targets are created.
-#
-class project-target : abstract-target
-{
- import project ;
- import targets ;
- import path ;
- import print ;
- import property-set ;
- import set ;
- import sequence ;
- import "class" : new ;
- import errors ;
-
- rule __init__ ( name : project-module parent-project ?
- : requirements * : default-build * )
- {
- abstract-target.__init__ $(name) : $(__name__) ;
-
- self.project-module = $(project-module) ;
- self.location = [ project.attribute $(project-module) location ] ;
- self.requirements = $(requirements) ;
- self.default-build = $(default-build) ;
-
- if $(parent-project)
- {
- inherit $(parent-project) ;
- }
- }
-
- # This is needed only by the 'make' rule. Need to find the way to make
- # 'make' work without this method.
- #
- rule project-module ( )
- {
- return $(self.project-module) ;
- }
-
- rule get ( attribute )
- {
- return [ project.attribute $(self.project-module) $(attribute) ] ;
- }
-
- rule build-dir ( )
- {
- if ! $(self.build-dir)
- {
- self.build-dir = [ get build-dir ] ;
- if ! $(self.build-dir)
- {
- self.build-dir = [ path.join [ $(self.project).get location ]
- bin ] ;
- }
- }
- return $(self.build-dir) ;
- }
-
- # Generates all possible targets contained in this project.
- #
- rule generate ( property-set * )
- {
- if [ modules.peek : .debug-building ]
- {
- ECHO [ targets.indent ] "building project" [ name ] " ('$(__name__)') with" [ $(property-set).raw ] ;
- targets.increase-indent ;
- }
-
- local usage-requirements = [ property-set.empty ] ;
- local targets ;
-
- for local t in [ targets-to-build ]
- {
- local g = [ $(t).generate $(property-set) ] ;
- usage-requirements = [ $(usage-requirements).add $(g[1]) ] ;
- targets += $(g[2-]) ;
- }
- targets.decrease-indent ;
- return $(usage-requirements) [ sequence.unique $(targets) ] ;
- }
-
- # Computes and returns a list of abstract-target instances which must be
- # built when this project is built.
- #
- rule targets-to-build ( )
- {
- local result ;
-
- if ! $(self.built-main-targets)
- {
- build-main-targets ;
- }
-
- # Collect all main targets here, except for "explicit" ones.
- for local t in $(self.main-targets)
- {
- if ! [ $(t).name ] in $(self.explicit-targets)
- {
- result += $(t) ;
- }
- }
-
- # Collect all projects referenced via "projects-to-build" attribute.
- local self-location = [ get location ] ;
- for local pn in [ get projects-to-build ]
- {
- result += [ find $(pn)/ ] ;
- }
-
- return $(result) ;
- }
-
- # Add 'target' to the list of targets in this project that should be build
- # only by explicit request
- #
- rule mark-target-as-explicit ( target-name * )
- {
- # Record the name of the target, not instance, since this rule is called
- # before main target instances are created.
- self.explicit-targets += $(target-name) ;
- }
-
- rule mark-target-as-always ( target-name * )
- {
- # Record the name of the target, not instance, since this rule is called
- # before main target instances are created.
- self.always-targets += $(target-name) ;
- }
-
- # Add new target alternative
- #
- rule add-alternative ( target-instance )
- {
- if $(self.built-main-targets)
- {
- errors.error add-alternative called when main targets are already
- created. : in project [ full-name ] ;
- }
- self.alternatives += $(target-instance) ;
- }
-
- # Returns a 'main-target' class instance corresponding to 'name'.
- #
- rule main-target ( name )
- {
- if ! $(self.built-main-targets)
- {
- build-main-targets ;
- }
- return $(self.main-target.$(name)) ;
- }
-
- # Returns whether a main target with the specified name exists.
- #
- rule has-main-target ( name )
- {
- if ! $(self.built-main-targets)
- {
- build-main-targets ;
- }
-
- if $(self.main-target.$(name))
- {
- return true ;
- }
- }
-
- # Worker function for the find rule not implementing any caching and simply
- # returning nothing in case the target can not be found.
- #
- rule find-really ( id )
- {
- local result ;
- local current-location = [ get location ] ;
-
- local split = [ MATCH (.*)//(.*) : $(id) ] ;
- local project-part = $(split[1]) ;
- local target-part = $(split[2]) ;
-
- local extra-error-message ;
- if $(project-part)
- {
- # There is an explicitly specified project part in id. Looks up the
- # project and passes the request to it.
- local pm = [ project.find $(project-part) : $(current-location) ] ;
- if $(pm)
- {
- project-target = [ project.target $(pm) ] ;
- result = [ $(project-target).find $(target-part) : no-error ] ;
- }
- else
- {
- # TODO: This extra error message will not get displayed most
- # likely due to some buggy refactoring. Refactor the code so the
- # message gets diplayed again.
- extra-error-message = error: could not find project
- '$(project-part)' ;
- }
- }
- else
- {
- # Interpret target-name as name of main target. Need to do this
- # before checking for file. Consider the following scenario with a
- # toolset not modifying its executable's names, e.g. gcc on
- # Unix-like platforms:
- #
- # exe test : test.cpp ;
- # install s : test : <location>. ;
- #
- # After the first build we would have a target named 'test' in the
- # Jamfile and a file named 'test' on the disk. We need the target to
- # override the file.
- result = [ main-target $(id) ] ;
-
- # Interpret id as an existing file reference.
- if ! $(result)
- {
- result = [ new file-reference [ path.make $(id) ] :
- $(self.project) ] ;
- if ! [ $(result).exists ]
- {
- result = ;
- }
- }
-
- # Interpret id as project-id.
- if ! $(result)
- {
- local project-module = [ project.find $(id) :
- $(current-location) ] ;
- if $(project-module)
- {
- result = [ project.target $(project-module) ] ;
- }
- }
- }
-
- return $(result) ;
- }
-
- # Find and return the target with the specified id, treated relative to
- # self. Id may specify either a target or a file name with the target taking
- # priority. May report an error or return nothing if the target is not found
- # depending on the 'no-error' parameter.
- #
- rule find ( id : no-error ? )
- {
- local v = $(.id.$(id)) ;
- if ! $(v)
- {
- v = [ find-really $(id) ] ;
- if ! $(v)
- {
- v = none ;
- }
- .id.$(id) = $(v) ;
- }
-
- if $(v) != none
- {
- return $(v) ;
- }
- else
- {
- if ! $(no-error)
- {
- local current-location = [ get location ] ;
- ECHO "error: Unable to find file or target named" ;
- ECHO "error: '$(id)'" ;
- ECHO "error: referred from project at" ;
- ECHO "error: '$(current-location)'" ;
- ECHO $(extra-error-message) ;
- EXIT ;
- }
- }
- }
-
- rule build-main-targets ( )
- {
- self.built-main-targets = true ;
- for local a in $(self.alternatives)
- {
- local name = [ $(a).name ] ;
- local target = $(self.main-target.$(name)) ;
- if ! $(target)
- {
- local t = [ new main-target $(name) : $(self.project) ] ;
- self.main-target.$(name) = $(t) ;
- self.main-targets += $(t) ;
- target = $(self.main-target.$(name)) ;
- }
-
- if $(name) in $(self.always-targets)
- {
- $(a).always ;
- }
-
- $(target).add-alternative $(a) ;
- }
- }
-
- # Accessor, add a constant.
- #
- rule add-constant (
- name # Variable name of the constant.
- : value + # Value of the constant.
- : type ? # Optional type of value.
- )
- {
- switch $(type)
- {
- case path :
- local r ;
- for local v in $(value)
- {
- local l = $(self.location) ;
- if ! $(l)
- {
- # Project corresponding to config files do not have
- # 'location' attribute, but do have source location.
- # It might be more reasonable to make every project have
- # a location and use some other approach to prevent buildable
- # targets in config files, but that's for later.
- l = [ get source-location ] ;
- }
- v = [ path.root [ path.make $(v) ] $(l) ] ;
- # Now make the value absolute path.
- v = [ path.root $(v) [ path.pwd ] ] ;
- # Constants should be in platform-native form.
- v = [ path.native $(v) ] ;
- r += $(v) ;
- }
- value = $(r) ;
- }
- if ! $(name) in $(self.constants)
- {
- self.constants += $(name) ;
- }
- self.constant.$(name) = $(value) ;
- # Inject the constant in the scope of the Jamroot module.
- modules.poke $(self.project-module) : $(name) : $(value) ;
- }
-
- rule inherit ( parent )
- {
- for local c in [ modules.peek $(parent) : self.constants ]
- {
- # No need to pass the type. Path constants were converted to
- # absolute paths already by parent.
- add-constant $(c)
- : [ modules.peek $(parent) : self.constant.$(c) ] ;
- }
-
- # Import rules from parent.
- local this-module = [ project-module ] ;
- local parent-module = [ $(parent).project-module ] ;
- # Do not import rules coming from 'project-rules' as they must be
- # imported localized.
- local user-rules = [ set.difference
- [ RULENAMES $(parent-module) ] :
- [ RULENAMES project-rules ] ] ;
- IMPORT $(parent-module) : $(user-rules) : $(this-module) : $(user-rules) ;
- EXPORT $(this-module) : $(user-rules) ;
- }
-}
-
-
-# Helper rules to detect cycles in main target references.
-#
-local rule start-building ( main-target-instance )
-{
- if $(main-target-instance) in $(.targets-being-built)
- {
- local names ;
- for local t in $(.targets-being-built) $(main-target-instance)
- {
- names += [ $(t).full-name ] ;
- }
-
- errors.error "Recursion in main target references"
- : "the following target are being built currently:"
- : $(names) ;
- }
- .targets-being-built += $(main-target-instance) ;
-}
-
-
-local rule end-building ( main-target-instance )
-{
- .targets-being-built = $(.targets-being-built[1--2]) ;
-}
-
-
-# A named top-level target in Jamfile.
-#
-class main-target : abstract-target
-{
- import assert ;
- import errors ;
- import feature ;
- import print ;
- import property-set ;
- import sequence ;
- import targets : start-building end-building ;
-
- rule __init__ ( name : project )
- {
- abstract-target.__init__ $(name) : $(project) ;
- }
-
- # Add a new alternative for this target
- rule add-alternative ( target )
- {
- local d = [ $(target).default-build ] ;
- if $(self.alternatives) && ( $(self.default-build) != $(d) )
- {
- errors.error "default build must be identical in all alternatives"
- : "main target is" [ full-name ]
- : "with" [ $(d).raw ]
- : "differing from previous default build" [ $(self.default-build).raw ] ;
- }
- else
- {
- self.default-build = $(d) ;
- }
- self.alternatives += $(target) ;
- }
-
- # Returns the best viable alternative for this property-set. See the
- # documentation for selection rules.
- #
- local rule select-alternatives ( property-set debug ? )
- {
- # When selecting alternatives we have to consider defaults, for example:
- # lib l : l.cpp : <variant>debug ;
- # lib l : l_opt.cpp : <variant>release ;
- # won't work unless we add default value <variant>debug.
- property-set = [ $(p).add-defaults ] ;
-
- # The algorithm: we keep the current best viable alternative. When we've
- # got a new best viable alternative, we compare it with the current one.
-
- local best ;
- local best-properties ;
-
- if $(self.alternatives[2-])
- {
- local bad ;
- local worklist = $(self.alternatives) ;
- while $(worklist) && ! $(bad)
- {
- local v = $(worklist[1]) ;
- local properties = [ $(v).match $(property-set) $(debug) ] ;
-
- if $(properties) != no-match
- {
- if ! $(best)
- {
- best = $(v) ;
- best-properties = $(properties) ;
- }
- else
- {
- if $(properties) = $(best-properties)
- {
- bad = true ;
- }
- else if $(properties) in $(best-properties)
- {
- # Do nothing, this alternative is worse
- }
- else if $(best-properties) in $(properties)
- {
- best = $(v) ;
- best-properties = $(properties) ;
- }
- else
- {
- bad = true ;
- }
- }
- }
- worklist = $(worklist[2-]) ;
- }
- if ! $(bad)
- {
- return $(best) ;
- }
- }
- else
- {
- return $(self.alternatives) ;
- }
- }
-
- rule apply-default-build ( property-set )
- {
- return [ targets.apply-default-build $(property-set)
- : $(self.default-build) ] ;
- }
-
- # Select an alternative for this main target, by finding all alternatives
- # which requirements are satisfied by 'properties' and picking the one with
- # the longest requirements set. Returns the result of calling 'generate' on
- # that alternative.
- #
- rule generate ( property-set )
- {
- start-building $(__name__) ;
-
- # We want composite properties in build request act as if all the
- # properties it expands too are explicitly specified.
- property-set = [ $(property-set).expand ] ;
-
- local all-property-sets = [ apply-default-build $(property-set) ] ;
- local usage-requirements = [ property-set.empty ] ;
- local result ;
- for local p in $(all-property-sets)
- {
- local r = [ generate-really $(p) ] ;
- if $(r)
- {
- usage-requirements = [ $(usage-requirements).add $(r[1]) ] ;
- result += $(r[2-]) ;
- }
- }
- end-building $(__name__) ;
- return $(usage-requirements) [ sequence.unique $(result) ] ;
- }
-
- # Generates the main target with the given property set and returns a list
- # which first element is property-set object containing usage-requirements
- # of generated target and with generated virtual target in other elements.
- # It is possible that no targets are generated.
- #
- local rule generate-really ( property-set )
- {
- local best-alternatives = [ select-alternatives $(property-set) ] ;
- if ! $(best-alternatives)
- {
- ECHO "error: No best alternative for" [ full-name ] ;
- select-alternatives $(property-set) debug ;
- return [ property-set.empty ] ;
- }
- else
- {
- # Now return virtual targets for the only alternative.
- return [ $(best-alternatives).generate $(property-set) ] ;
- }
- }
-
- rule rename ( new-name )
- {
- abstract-target.rename $(new-name) ;
- for local a in $(self.alternatives)
- {
- $(a).rename $(new-name) ;
- }
- }
-}
-
-
-# Abstract target refering to a source file. This is an artificial entity
-# allowing sources to a target to be represented using a list of abstract target
-# instances.
-#
-class file-reference : abstract-target
-{
- import virtual-target ;
- import property-set ;
- import path ;
-
- rule __init__ ( file : project )
- {
- abstract-target.__init__ $(file) : $(project) ;
- }
-
- rule generate ( properties )
- {
- return [ property-set.empty ] [ virtual-target.from-file $(self.name) :
- [ location ] : $(self.project) ] ;
- }
-
- # Returns true if the referred file really exists.
- rule exists ( )
- {
- location ;
- return $(self.file-path) ;
- }
-
- # Returns the location of target. Needed by 'testing.jam'.
- rule location ( )
- {
- if ! $(self.file-location)
- {
- local source-location = [ $(self.project).get source-location ] ;
- for local src-dir in $(source-location)
- {
- if ! $(self.file-location)
- {
- local location = [ path.root $(self.name) $(src-dir) ] ;
- if [ CHECK_IF_FILE [ path.native $(location) ] ]
- {
- self.file-location = $(src-dir) ;
- self.file-path = $(location) ;
- }
- }
- }
- }
- return $(self.file-location) ;
- }
-}
-
-
-# Given a target-reference, made in context of 'project', returns the
-# abstract-target instance that is referred to, as well as properties explicitly
-# specified for this reference.
-#
-rule resolve-reference ( target-reference : project )
-{
- # Separate target name from properties override.
- local split = [ MATCH "^([^<]*)(/(<.*))?$" : $(target-reference) ] ;
- local id = $(split[1]) ;
- local sproperties = ;
- if $(split[3])
- {
- sproperties = [ property.make [ feature.split $(split[3]) ] ] ;
- sproperties = [ feature.expand-composites $(sproperties) ] ;
- }
-
- # Find the target.
- local target = [ $(project).find $(id) ] ;
-
- return $(target) [ property-set.create $(sproperties) ] ;
-}
-
-
-# Attempts to generate the target given by target reference, which can refer
-# both to a main target or to a file. Returns a list consisting of
-# - usage requirements
-# - generated virtual targets, if any
-#
-rule generate-from-reference (
- target-reference # Target reference.
- : project # Project where the reference is made.
- : property-set # Properties of the main target that makes the reference.
-)
-{
- local r = [ resolve-reference $(target-reference) : $(project) ] ;
- local target = $(r[1]) ;
- local sproperties = $(r[2]) ;
-
- # Take properties which should be propagated and refine them with
- # source-specific requirements.
- local propagated = [ $(property-set).propagated ] ;
- local rproperties = [ $(propagated).refine $(sproperties) ] ;
- if $(rproperties[1]) = "@error"
- {
- errors.error
- "When building" [ full-name ] " with properties " $(properties) :
- "Invalid properties specified for " $(source) ":"
- $(rproperties[2-]) ;
- }
- return [ $(target).generate $(rproperties) ] ;
-}
-
-rule apply-default-build ( property-set : default-build )
-{
- # 1. First, see what properties from default-build are already present
- # in property-set.
-
- local raw = [ $(property-set).raw ] ;
- local specified-features = $(raw:G) ;
-
- local defaults-to-apply ;
- for local d in [ $(default-build).raw ]
- {
- if ! $(d:G) in $(specified-features)
- {
- defaults-to-apply += $(d) ;
- }
- }
-
- # 2. If there are any defaults to be applied, form a new build request.
- # Pass it through to 'expand-no-defaults' since default-build might
- # contain "release debug" resulting in two property-sets.
- local result ;
- if $(defaults-to-apply)
- {
- properties = [
- build-request.expand-no-defaults
-
- # We have to compress subproperties here to prevent property
- # lists like:
- #
- # <toolset>msvc <toolset-msvc:version>7.1 <threading>multi
- #
- # from being expanded into:
- #
- # <toolset-msvc:version>7.1/<threading>multi
- # <toolset>msvc/<toolset-msvc:version>7.1/<threading>multi
- #
- # due to a cross-product property combination. That may be an
- # indication that build-request.expand-no-defaults is the wrong
- # rule to use here.
- [ feature.compress-subproperties $(raw) ]
- $(defaults-to-apply)
- ] ;
-
- if $(properties)
- {
- for local p in $(properties)
- {
- result += [ property-set.create
- [ feature.expand [ feature.split $(p) ] ] ] ;
- }
- }
- else
- {
- result = [ property-set.empty ] ;
- }
- }
- else
- {
- result = $(property-set) ;
- }
- return $(result) ;
-}
-
-
-# Given a build request and requirements, return properties common to dependency
-# build request and target requirements.
-#
-# TODO: Document exactly what 'common properties' are, whether they should
-# include default property values, whether they should contain any conditional
-# properties or should those be already processed, etc. See whether there are
-# any differences between use cases with empty and non-empty build-request as
-# well as with requirements containing and those not containing any non-free
-# features.
-#
-rule common-properties ( build-request requirements )
-{
- # For optimization, we add free requirements directly, without using a
- # complex algorithm. This gives the complex algorithm a better chance of
- # caching results.
- local free = [ $(requirements).free ] ;
- local non-free = [ property-set.create [ $(requirements).base ]
- [ $(requirements).incidental ] ] ;
-
- local key = .rp.$(build-request)-$(non-free) ;
- if ! $($(key))
- {
- $(key) = [ common-properties2 $(build-request) $(non-free) ] ;
- }
- result = [ $($(key)).add-raw $(free) ] ;
-}
-
-
-# Given a 'context' -- a set of already present properties, and 'requirements',
-# decide which extra properties should be applied to 'context'. For conditional
-# requirements, this means evaluating the condition. For indirect conditional
-# requirements, this means calling a rule. Ordinary requirements are always
-# applied.
-#
-# Handles the situation where evaluating one conditional requirement affects
-# conditions of another conditional requirements, such as:
-# <toolset>gcc:<variant>release <variant>release:<define>RELEASE
-#
-# If 'what' is 'refined' returns context refined with new requirements. If
-# 'what' is 'added' returns just the requirements to be applied.
-#
-rule evaluate-requirements ( requirements : context : what )
-{
- # Apply non-conditional requirements. It is possible that further
- # conditional requirement change a value set by non-conditional
- # requirements. For example:
- #
- # exe a : a.cpp : <threading>single <toolset>foo:<threading>multi ;
- #
- # I am not sure if this should be an error, or not, especially given that
- #
- # <threading>single
- #
- # might come from project's requirements.
-
- local unconditional = [ feature.expand [ $(requirements).non-conditional ] ] ;
-
- local raw = [ $(context).raw ] ;
- raw = [ property.refine $(raw) : $(unconditional) ] ;
-
- # We have collected properties that surely must be present in common
- # properties. We now try to figure out what other properties should be added
- # in order to satisfy rules (4)-(6) from the docs.
-
- local conditionals = [ $(requirements).conditional ] ;
- # The 'count' variable has one element for each conditional feature and for
- # each occurrence of '<indirect-conditional>' feature. It is used as a loop
- # counter: for each iteration of the loop before we remove one element and
- # the property set should stabilize before we are done. It is assumed that
- # #conditionals iterations should be enough for properties to propagate
- # along conditions in any direction.
- local count = $(conditionals)
- [ $(requirements).get <conditional> ]
- and-once-more ;
-
- local added-requirements ;
-
- local current = $(raw) ;
-
- # It is assumed that ordinary conditional requirements can not add
- # <conditional> properties (a.k.a. indirect conditional properties), and
- # that rules referred to by <conditional> properties can not add new
- # <conditional> properties. So the list of indirect conditionals does not
- # change.
- local indirect = [ $(requirements).get <conditional> ] ;
- indirect = [ MATCH ^@(.*) : $(indirect) ] ;
-
- local ok ;
- while $(count)
- {
- # Evaluate conditionals in context of current properties.
- local e = [ property.evaluate-conditionals-in-context $(conditionals)
- : $(current) ] ;
-
- # Evaluate indirect conditionals.
- for local i in $(indirect)
- {
- e += [ indirect.call $(i) $(current) ] ;
- }
-
- if $(e) = $(added-requirements)
- {
- # If we got the same result, we have found the final properties.
- count = ;
- ok = true ;
- }
- else
- {
- # Oops, conditional evaluation results have changed. Also 'current'
- # contains leftovers from a previous evaluation. Recompute 'current'
- # using initial properties and conditional requirements.
- added-requirements = $(e) ;
- current = [ property.refine $(raw) : [ feature.expand $(e) ] ] ;
- }
- count = $(count[2-]) ;
- }
- if ! $(ok)
- {
- errors.error "Can not evaluate conditional properties " $(conditionals) ;
- }
-
- if $(what) = added
- {
- return [ property-set.create $(unconditional) $(added-requirements) ] ;
- }
- else if $(what) = refined
- {
- return [ property-set.create $(current) ] ;
- }
- else
- {
- errors.error "Invalid value of the 'what' parameter." ;
- }
-}
-
-
-rule common-properties2 ( build-request requirements )
-{
- # This guarantees that default properties are present in the result, unless
- # they are overriden by some requirement. FIXME: There is possibility that
- # we have added <foo>bar, which is composite and expands to <foo2>bar2, but
- # default value of <foo2> is not bar2, in which case it is not clear what to
- # do.
- #
- build-request = [ $(build-request).add-defaults ] ;
- # Features added by 'add-default' can be composite and expand to features
- # without default values -- so they are not added yet. It could be clearer/
- # /faster to expand only newly added properties but that is not critical.
- build-request = [ $(build-request).expand ] ;
-
- return [ evaluate-requirements $(requirements) : $(build-request) :
- refined ] ;
-}
-
-rule push-target ( target )
-{
- .targets = $(target) $(.targets) ;
-}
-
-rule pop-target ( )
-{
- .targets = $(.targets[2-]) ;
-}
-
-# Return the metatarget that is currently being generated.
-rule current ( )
-{
- return $(.targets[1]) ;
-}
-
-
-# Implements the most standard way of constructing main target alternative from
-# sources. Allows sources to be either file or other main target and handles
-# generation of those dependency targets.
-#
-class basic-target : abstract-target
-{
- import build-request ;
- import build-system ;
- import "class" : new ;
- import errors ;
- import feature ;
- import property ;
- import property-set ;
- import sequence ;
- import set ;
- import targets ;
- import virtual-target ;
-
- rule __init__ ( name : project : sources * : requirements *
- : default-build * : usage-requirements * )
- {
- abstract-target.__init__ $(name) : $(project) ;
-
- self.sources = $(sources) ;
- if ! $(requirements) {
- requirements = [ property-set.empty ] ;
- }
- self.requirements = $(requirements) ;
- if ! $(default-build)
- {
- default-build = [ property-set.empty ] ;
- }
- self.default-build = $(default-build) ;
- if ! $(usage-requirements)
- {
- usage-requirements = [ property-set.empty ] ;
- }
- self.usage-requirements = $(usage-requirements) ;
-
- if $(sources:G)
- {
- errors.user-error properties found in the 'sources' parameter for
- [ full-name ] ;
- }
- }
-
- rule always ( )
- {
- self.always = 1 ;
- }
-
- # Returns the list of abstract-targets which are used as sources. The extra
- # properties specified for sources are not represented. The only user for
- # this rule at the moment is the "--dump-tests" feature of the test system.
- #
- rule sources ( )
- {
- if ! $(self.source-targets)
- {
- for local s in $(self.sources)
- {
- self.source-targets +=
- [ targets.resolve-reference $(s) : $(self.project) ] ;
- }
- }
- return $(self.source-targets) ;
- }
-
- rule requirements ( )
- {
- return $(self.requirements) ;
- }
-
- rule default-build ( )
- {
- return $(self.default-build) ;
- }
-
- # Returns the alternative condition for this alternative, if the condition
- # is satisfied by 'property-set'.
- #
- rule match ( property-set debug ? )
- {
- # The condition is composed of all base non-conditional properties. It
- # is not clear if we should expand 'self.requirements' or not. For one
- # thing, it would be nice to be able to put
- # <toolset>msvc-6.0
- # in requirements. On the other hand, if we have <variant>release as a
- # condition it does not make sense to require <optimization>full to be
- # in the build request just to select this variant.
- local bcondition = [ $(self.requirements).base ] ;
- local ccondition = [ $(self.requirements).conditional ] ;
- local condition = [ set.difference $(bcondition) : $(ccondition) ] ;
- if $(debug)
- {
- ECHO " next alternative: required properties:" $(condition:E=(empty)) ;
- }
-
- if $(condition) in [ $(property-set).raw ]
- {
- if $(debug)
- {
- ECHO " matched" ;
- }
- return $(condition) ;
- }
- else
- {
- if $(debug)
- {
- ECHO " not matched" ;
- }
- return no-match ;
- }
- }
-
- # Takes a target reference, which might be either target id or a dependency
- # property, and generates that target using 'property-set' as build request.
- #
- # The results are added to the variable called 'result-var'. Usage
- # requirements are added to the variable called 'usage-requirements-var'.
- #
- rule generate-dependencies ( dependencies * : property-set
- : result-var usage-requirements-var )
- {
- for local dependency in $(dependencies)
- {
- local grist = $(dependency:G) ;
- local id = $(dependency:G=) ;
-
- local result = [ targets.generate-from-reference $(id) :
- $(self.project) : $(property-set) ] ;
-
- $(result-var) += $(result[2-]:G=$(grist)) ;
- $(usage-requirements-var) += [ $(result[1]).raw ] ;
- }
- }
-
- # Determines final build properties, generates sources, and calls
- # 'construct'. This method should not be overridden.
- #
- rule generate ( property-set )
- {
- if [ modules.peek : .debug-building ]
- {
- ECHO ;
- local fn = [ full-name ] ;
- ECHO [ targets.indent ] "Building target '$(fn)'" ;
- targets.increase-indent ;
- ECHO [ targets.indent ] "Build request: " $(property-set) [ $(property-set).raw ] ;
- local cf = [ build-system.command-line-free-features ] ;
- ECHO [ targets.indent ] "Command line free features: " [ $(cf).raw ] ;
- ECHO [ targets.indent ] "Target requirements: " [ $(self.requirements).raw ] ;
- }
- targets.push-target $(__name__) ;
-
- if ! $(self.generated.$(property-set))
- {
- # Apply free features from the command line. If user said
- # define=FOO
- # he most likely wants this define to be set for all compiles.
- property-set = [ $(property-set).refine
- [ build-system.command-line-free-features ] ] ;
- local rproperties = [ targets.common-properties $(property-set)
- $(self.requirements) ] ;
-
- if [ modules.peek : .debug-building ]
- {
- ECHO ;
- ECHO [ targets.indent ] "Common properties: " [ $(rproperties).raw ] ;
- }
-
- if ( $(rproperties[1]) != "@error" ) && ( [ $(rproperties).get
- <build> ] != no )
- {
- local source-targets ;
- local properties = [ $(rproperties).non-dependency ] ;
- local usage-requirements ;
-
- generate-dependencies [ $(rproperties).dependency ] :
- $(rproperties) : properties usage-requirements ;
-
- generate-dependencies $(self.sources) : $(rproperties) :
- source-targets usage-requirements ;
-
- if [ modules.peek : .debug-building ]
- {
- ECHO ;
- ECHO [ targets.indent ] "Usage requirements for"
- $(self.name)": " $(usage-requirements) ;
- }
-
- rproperties = [ property-set.create $(properties)
- $(usage-requirements) ] ;
- usage-requirements = [ property-set.create $(usage-requirements) ] ;
-
- if [ modules.peek : .debug-building ]
- {
- ECHO [ targets.indent ] "Build properties: "
- [ $(rproperties).raw ] ;
- }
-
- local extra = [ $(rproperties).get <source> ] ;
- source-targets += $(extra:G=) ;
- # We might get duplicate sources, for example if we link to two
- # libraries having the same <library> usage requirement.
- # Use stable sort, since for some targets the order is
- # important. E.g. RUN_PY target need python source to come
- # first.
- source-targets = [ sequence.unique $(source-targets) : stable ] ;
-
- local result = [ construct $(self.name) : $(source-targets) :
- $(rproperties) ] ;
-
- if $(result)
- {
- local gur = $(result[1]) ;
- result = $(result[2-]) ;
-
- if $(self.always)
- {
- for local t in $(result)
- {
- $(t).always ;
- }
- }
-
- local s = [ create-subvariant $(result)
- : [ virtual-target.recent-targets ]
- : $(property-set) : $(source-targets)
- : $(rproperties) : $(usage-requirements) ] ;
- virtual-target.clear-recent-targets ;
-
- local ur = [ compute-usage-requirements $(s) ] ;
- ur = [ $(ur).add $(gur) ] ;
- $(s).set-usage-requirements $(ur) ;
- if [ modules.peek : .debug-building ]
- {
- ECHO [ targets.indent ] "Usage requirements from"
- $(self.name)": " [ $(ur).raw ] ;
- }
-
- self.generated.$(property-set) = $(ur) $(result) ;
- }
- }
- else
- {
- if $(rproperties[1]) = "@error"
- {
- ECHO [ targets.indent ] "Skipping build of:" [ full-name ]
- "cannot compute common properties" ;
- }
- else if [ $(rproperties).get <build> ] = no
- {
- # If we just see <build>no, we cannot produce any reasonable
- # diagnostics. The code that adds this property is expected
- # to explain why a target is not built, for example using
- # the configure.log-component-configuration function.
- }
- else
- {
- ECHO [ targets.indent ] "Skipping build of: " [ full-name ]
- " unknown reason" ;
- }
-
- # We are here either because there has been an error computing
- # properties or there is <build>no in properties. In the latter
- # case we do not want any diagnostic. In the former case, we
- # need diagnostics. FIXME
-
- # If this target fails to build, add <build>no to properties to
- # cause any parent target to fail to build. Except that it
- # - does not work now, since we check for <build>no only in
- # common properties, but not in properties that came from
- # dependencies
- # - it is not clear if that is a good idea anyway. The alias
- # target, for example, should not fail to build if a
- # dependency fails.
- self.generated.$(property-set) = [ property-set.create <build>no ] ;
- }
- }
- else
- {
- if [ modules.peek : .debug-building ]
- {
- ECHO [ targets.indent ] "Already built" ;
- local ur = $(self.generated.$(property-set)) ;
- ur = $(ur[0]) ;
- targets.increase-indent ;
- ECHO [ targets.indent ] "Usage requirements from"
- $(self.name)": " [ $(ur).raw ] ;
- targets.decrease-indent ;
- }
- }
-
- targets.pop-target ;
- targets.decrease-indent ;
- return $(self.generated.$(property-set)) ;
- }
-
- # Given the set of generated targets, and refined build properties,
- # determines and sets appropriate usage requirements on those targets.
- #
- rule compute-usage-requirements ( subvariant )
- {
- local rproperties = [ $(subvariant).build-properties ] ;
- xusage-requirements = [ targets.evaluate-requirements
- $(self.usage-requirements) : $(rproperties) : added ] ;
-
- # We generate all dependency properties and add them, as well as their
- # usage requirements, to the result.
- local extra ;
- generate-dependencies [ $(xusage-requirements).dependency ] :
- $(rproperties) : extra extra ;
-
- local result = [ property-set.create
- [ $(xusage-requirements).non-dependency ] $(extra) ] ;
-
- # Propagate usage requirements we got from sources, except for the
- # <pch-header> and <pch-file> features.
- #
- # That feature specifies which pch file to use, and should apply only to
- # direct dependents. Consider:
- #
- # pch pch1 : ...
- # lib lib1 : ..... pch1 ;
- # pch pch2 :
- # lib lib2 : pch2 lib1 ;
- #
- # Here, lib2 should not get <pch-header> property from pch1.
- #
- # Essentially, when those two features are in usage requirements, they
- # are propagated only to direct dependents. We might need a more general
- # mechanism, but for now, only those two features are special.
- #
- # TODO - Actually there are more possible candidates like for instance
- # when listing static library X as a source for another static library.
- # Then static library X will be added as a <source> property to the
- # second library's usage requirements but those requirements should last
- # only up to the first executable or shared library that actually links
- # to it.
- local raw = [ $(subvariant).sources-usage-requirements ] ;
- raw = [ $(raw).raw ] ;
- raw = [ property.change $(raw) : <pch-header> ] ;
- raw = [ property.change $(raw) : <pch-file> ] ;
- return [ $(result).add [ property-set.create $(raw) ] ] ;
- }
-
- # Creates new subvariant instances for 'targets'.
- # 'root-targets' - virtual targets to be returned to dependants
- # 'all-targets' - virtual targets created while building this main target
- # 'build-request' - property-set instance with requested build properties
- #
- local rule create-subvariant ( root-targets * : all-targets * :
- build-request : sources * : rproperties : usage-requirements )
- {
- for local e in $(root-targets)
- {
- $(e).root true ;
- }
-
- # Process all virtual targets that will be created if this main target
- # is created.
- local s = [ new subvariant $(__name__) : $(build-request) : $(sources) :
- $(rproperties) : $(usage-requirements) : $(all-targets) ] ;
- for local v in $(all-targets)
- {
- if ! [ $(v).creating-subvariant ]
- {
- $(v).creating-subvariant $(s) ;
- }
- }
- return $(s) ;
- }
-
- # Constructs virtual targets for this abstract target and the dependency
- # graph. Returns a usage-requirements property-set and a list of virtual
- # targets. Should be overriden in derived classes.
- #
- rule construct ( name : source-targets * : properties * )
- {
- errors.error "method should be defined in derived classes" ;
- }
-}
-
-
-class typed-target : basic-target
-{
- import generators ;
-
- rule __init__ ( name : project : type : sources * : requirements * :
- default-build * : usage-requirements * )
- {
- basic-target.__init__ $(name) : $(project) : $(sources) :
- $(requirements) : $(default-build) : $(usage-requirements) ;
-
- self.type = $(type) ;
- }
-
- rule type ( )
- {
- return $(self.type) ;
- }
-
- rule construct ( name : source-targets * : property-set )
- {
- local r = [ generators.construct $(self.project) $(name:S=) : $(self.type)
- : [ property-set.create [ $(property-set).raw ]
- <main-target-type>$(self.type) ]
- : $(source-targets) : true ] ;
- if ! $(r)
- {
- ECHO "warn: Unable to construct" [ full-name ] ;
-
- # Are there any top-level generators for this type/property set.
- if ! [ generators.find-viable-generators $(self.type)
- : $(property-set) ]
- {
- ECHO "error: no generators were found for type '$(self.type)'" ;
- ECHO "error: and the requested properties" ;
- ECHO "error: make sure you've configured the needed tools" ;
- ECHO "See http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.html" ;
- ECHO "To debug this problem, try the --debug-generators option." ;
- EXIT ;
- }
- }
- return $(r) ;
- }
-}
-
-
-# Return the list of sources to use, if main target rule is invoked with
-# 'sources'. If there are any objects in 'sources', they are treated as main
-# target instances, and the name of such targets are adjusted to be
-# '<name_of_this_target>__<name_of_source_target>'. Such renaming is disabled if
-# a non-empty value is passed as the 'no-renaming' parameter.
-#
-rule main-target-sources ( sources * : main-target-name : no-renaming ? )
-{
- local result ;
- for local t in $(sources)
- {
- if [ class.is-instance $(t) ]
- {
- local name = [ $(t).name ] ;
- if ! $(no-renaming)
- {
- name = $(main-target-name)__$(name) ;
- $(t).rename $(name) ;
- }
- # Inline targets are not built by default.
- local p = [ $(t).project ] ;
- $(p).mark-target-as-explicit $(name) ;
- result += $(name) ;
- }
- else
- {
- result += $(t) ;
- }
- }
- return $(result) ;
-}
-
-
-# Returns the requirements to use when declaring a main target, obtained by
-# translating all specified property paths and refining project requirements
-# with the ones specified for the target.
-#
-rule main-target-requirements (
- specification * # Properties explicitly specified for the main target.
- : project # Project where the main target is to be declared.
-)
-{
- specification += [ toolset.requirements ] ;
-
- local requirements = [ property-set.refine-from-user-input
- [ $(project).get requirements ] : $(specification) :
- [ $(project).project-module ] : [ $(project).get location ] ] ;
- if $(requirements[1]) = "@error"
- {
- errors.error "Conflicting requirements for target:" $(requirements) ;
- }
- return $(requirements) ;
-}
-
-
-# Returns the usage requirements to use when declaring a main target, which are
-# obtained by translating all specified property paths and adding project's
-# usage requirements.
-#
-rule main-target-usage-requirements (
- specification * # Use-properties explicitly specified for a main target.
- : project # Project where the main target is to be declared.
-)
-{
- local project-usage-requirements = [ $(project).get usage-requirements ] ;
-
- # We do not use 'refine-from-user-input' because:
- # - I am not sure if removing parent's usage requirements makes sense
- # - refining usage requirements is not needed, since usage requirements are
- # always free.
- local usage-requirements = [ property-set.create-from-user-input
- $(specification)
- : [ $(project).project-module ] [ $(project).get location ] ] ;
-
- return [ $(project-usage-requirements).add $(usage-requirements) ] ;
-}
-
-
-# Return the default build value to use when declaring a main target, which is
-# obtained by using the specified value if not empty and parent's default build
-# attribute otherwise.
-#
-rule main-target-default-build (
- specification * # Default build explicitly specified for a main target.
- : project # Project where the main target is to be declared.
-)
-{
- local result ;
- if $(specification)
- {
- result = $(specification) ;
- }
- else
- {
- result = [ $(project).get default-build ] ;
- }
- return [ property-set.create-with-validation $(result) ] ;
-}
-
-
-# Registers the specified target as a main target alternative and returns it.
-#
-rule main-target-alternative ( target )
-{
- local ptarget = [ $(target).project ] ;
- $(ptarget).add-alternative $(target) ;
- return $(target) ;
-}
-
-# Creates a new metargets with the specified properties, using 'klass' as
-# the class. The 'name', 'sources',
-# 'requirements', 'default-build' and 'usage-requirements' are assumed to be in
-# the form specified by the user in Jamfile corresponding to 'project'.
-#
-rule create-metatarget ( klass : project : name : sources * : requirements * :
- default-build * : usage-requirements * )
-{
- return [
- targets.main-target-alternative
- [ new $(klass) $(name) : $(project)
- : [ 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) ]
- ] ] ;
-}
-
-# Creates a typed-target with the specified properties. The 'name', 'sources',
-# 'requirements', 'default-build' and 'usage-requirements' are assumed to be in
-# the form specified by the user in Jamfile corresponding to 'project'.
-#
-rule create-typed-target ( type : project : name : sources * : requirements * :
- default-build * : usage-requirements * )
-{
- return [
- targets.main-target-alternative
- [ new typed-target $(name) : $(project) : $(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) ]
- ] ] ;
-}