update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / tools / build / src / tools / stage.jam

# Copyright 2003 Dave Abrahams
# Copyright 2005, 2006 Rene Rivera
# Copyright 2002, 2003, 2004, 2005, 2006 Vladimir Prus
# Copyright 2020 Dmitry Arkhipov
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE.txt or copy at
# https://www.bfgroup.xyz/b2/LICENSE.txt)

#| tag::doc[]

[[bbv2.reference.modules.stage]]
= stage
This module defines the `install` rule, used to copy a set of targets to a
single location.

|# # end::doc[]


import "class" : new ;
import feature ;
import generators ;
import option ;
import path ;
import project ;
import property ;
import targets ;
import type ;
import types/register ;
import virtual-target ;


feature.feature <install-dependencies> : off on : incidental      ;
feature.feature <install-type>         :        : free incidental ;
feature.feature <install-source-root>  :        : free path       ;
feature.feature <so-version>           :        : free incidental ;

# If 'on', version symlinks for shared libraries will not be created. Affects
# Unix builds only.
feature.feature <install-no-version-symlinks> : on : optional incidental ;


#| tag::features-install-package-doc[]

[[bbv2.builtin.features.install-package]]`install-package`::
Specifies the name of the package to which installed files belong.  This is
used for default installation prefix on certain platforms.

|# # end::features-install-package-doc[]

feature.feature install-package : : free ;


#| tag::doc[]

[[bbv2.reference.modules.stage.add-install-dir]]
. `rule add-install-dir ( name : suffix ? : parent ? : options * )`
+
Defines a named installation directory.
+
For example, `add-install-dir foo : bar : baz ;` creates feature
<<bbv2.builtin.features.install-prefix,`<install-foo>`>> and adds support for
named directory `(foo)` to `install` rule. The rule will try to use the value
of `<install-foo>` property if present, otherwise will fallback to `(baz)/bar`.
+
Arguments:
+
* `name`: the name of the directory.
* `suffix`: the path suffix appended to the parent named directory.
* `parent`: the optional name of parent named directory.
* `options`: special options that modify treatment of the directory.
  Allowed options:
+
** `package-suffix`: append the package name to the default value. For example:
+
[source]
----
add-install-dir foo : bar : baz : package-suffix ;
install (foo) : a : <install-package>xyz ;
----
+
installs `a` into `(baz)/bar/xyz`.

|# # end::doc[]

.dirs = ;
rule add-install-dir ( name : suffix ? : parent ? : options * )
{
    suffix ?= "" ;
    if $(name) in $(.dirs)
    {
        import errors ;
        errors.error Directory name $(name) is already registered. ;
    }
    feature.feature install-$(name) : : free ;
    .dirs += $(name) ;
    .dir.$(name) = $(suffix) $(parent) ;
    .dir.$(name).options = $(options) ;
}


#| tag::doc[]

. `rule install-dir-names ( )`
+
Returns names of all registered installation directories.

|# # end::doc[]

rule install-dir-names ( )
{
    return $(.dirs) ;
}


#| tag::features-install-prefix-doc[]

[[bbv2.builtin.features.install-prefix]]`install-<name>`::
Specifies installation prefix for <<bbv2.tasks.installing,`install`>> targets.
These named installation prefixes are registered by default:
+
* `prefix`: `C:\<package name>` if `<target-os>windows` is in the property set,
  `/usr/local` otherwise
* `exec-prefix`: `(prefix)`
* `bindir`: `(exec-prefix)/bin`
* `sbindir`: `(exec-prefix)/sbin`
* `libexecdir`: `(exec-prefix)/libexec`
* `libdir`: `(exec-prefix)/lib`
* `datarootdir`: `(prefix)/share`
* `datadir`: `(datarootdir)`
* `sysconfdir`: `(prefix)/etc`
* `sharedstatedir`: `(prefix)/com`
* `localstatedir`: `(prefix)/var`
* `runstatedir`: `(localstatedir)/run`
* `includedir`: `(prefix)/include`
* `oldincludedir`: `/usr/include`
* `docdir`: `(datarootdir)/doc/<package name>`
* `infodir`: `(datarootdir)/info`
* `htmldir`: `(docdir)`
* `dvidir` : `(docdir)`
* `pdfdir` : `(docdir)`
* `psdir` : `(docdir)`
* `lispdir`: `(datarootdir)/emacs/site-lisp`
* `localedir`: `(datarootdir)/locale`
* `mandir`: `(datarootdir)/man`

If more are necessary, they could be added with
<<bbv2.reference.modules.stage.add-install-dir,`stage.add-install-dir`>>.

|# # end::features-install-prefix-doc[]

feature.feature install-prefix : : free path ;
add-install-dir exec-prefix : "" : prefix ;
add-install-dir bindir : bin : exec-prefix ;
add-install-dir sbindir : sbin : exec-prefix ;
add-install-dir libexecdir : libexec : exec-prefix ;
add-install-dir libdir : lib : exec-prefix ;
add-install-dir datarootdir : share : prefix ;
add-install-dir datadir : "" : datarootdir ;
add-install-dir sysconfdir : etc : prefix ;
add-install-dir sharedstatedir : com : prefix ;
add-install-dir localstatedir : var : prefix ;
add-install-dir runstatedir : run : localstatedir ;
add-install-dir includedir : "include" : prefix ;
add-install-dir oldincludedir : /usr/include ;
add-install-dir docdir : doc : datarootdir : package-suffix ;
add-install-dir infodir : info : datarootdir ;
add-install-dir htmldir : "" : docdir ;
add-install-dir dvidir : "" : docdir ;
add-install-dir pdfdir : "" : docdir ;
add-install-dir psdir : "" : docdir ;
add-install-dir lispdir : emacs/site-lisp : datarootdir ;
add-install-dir localedir : locale : datarootdir ;
add-install-dir mandir : man : datarootdir ;


#| tag::features-staging-prefix-doc[]

[[bbv2.builtin.features.staging-prefix]]`staging-prefix`::
Specifies staging prefix for <<bbv2.tasks.installing,`install`>> targets.
If present, it will be used instead of the path to named directory `prefix`.
Example:
+
[source]
----
project : requirements <install-prefix>x/y/z ;
install a1 : a : <location>(bindir) ; # installs into x/y/z/bin
install a2 : a : <location>(bindir) <staging-prefix>q ; # installs into q/bin
----
The feature is useful when you cannot (or don't want to) put build artfiacts
into their intented locations during the build (such as when cross-compiling),
but still need to communicate those intended locations to the build system,
e.g. to generate configuration files.

|# # end::features-staging-prefix-doc[]

feature.feature staging-prefix : : free path ;


class install-target-class : basic-target
{
    import "class" : new ;
    import feature ;
    import generators ;
    import path ;
    import project ;
    import property ;
    import property-set ;
    import stage ;
    import type ;

    rule __init__ ( name-and-dir : project : sources * : requirements * :
        default-build * : usage-requirements * )
    {
        # The usage-requirements specified here are ignored but are taken as a
        # parameter to have this metatarget class have the same standard
        # instantiation interface as all the other Boost Build metatarget
        # classes.
        basic-target.__init__ $(name-and-dir) : $(project) : $(sources) :
            $(requirements) : $(default-build) ;
    }

    # If <location> is not set, sets it based on the project data.
    # Either way, expands installation prefixes.
    rule update-location ( property-set )
    {
        local location = [ $(property-set).get <location> ] ;
        local project-location = [ $(self.project).get location ] ;

        local prefix ;
        local suffix = $(location) ;
        if $(suffix)
        {
            local rel = [ path.relative $(suffix) $(project-location)
                : no-error ] ;
            if not-a-child != $(rel)
            {
                suffix = $(rel) ;
            }
        }
        suffix ?= $(self.name) ;
        local matches = [ MATCH "^\\((.+)\\)(/(.*))?$" : $(suffix) ] ;

        # if location can be split into named directory and optional trailing
        # path, do the split and expand the name into path
        if $(matches)
        {
            suffix = $(matches[3]) ;
            suffix ?= "" ;
            local package-name = [ stage.get-package-name $(property-set)
                : [ $(self.project).project-module ] ] ;
            prefix = [ stage.get-dir $(matches[1]) : $(property-set)
                : $(package-name) : staged ] ;
        }
        # prefix location with the project's path
        else if ! $(location)
        {
            prefix = $(project-location) ;
        }

        # only modify location if it's necessary
        if $(prefix)
        {
            suffix = [ path.root $(suffix) $(prefix) ] ;
            local properties = [ $(property-set).raw ] ;
            properties = [ property.change $(properties) : <location> ] ;
            property-set = [ property-set.create $(properties) <location>$(suffix) ] ;
        }

        return $(property-set) ;
    }

    # Takes a target that is installed and a property set which is used when
    # installing.
    #
    rule adjust-properties ( target : build-property-set )
    {
        local ps-raw ;
        local a = [ $(target).action ] ;
        if $(a)
        {
            local ps = [ $(a).properties ] ;
            ps-raw = [ $(ps).raw ] ;

            # Unless <hardcode-dll-paths>true is in properties, which can happen
            # only if the user has explicitly requested it, nuke all <dll-path>
            # properties.
            if [ $(build-property-set).get <hardcode-dll-paths> ] != true
            {
                ps-raw = [ property.change $(ps-raw) : <dll-path> ] ;
            }

            # If any <dll-path> properties were specified for installing, add
            # them.
            local l = [ $(build-property-set).get <dll-path> ] ;
            ps-raw += $(l:G=<dll-path>) ;

            # Also copy <linkflags> feature from current build set, to be used
            # for relinking.
            local l = [ $(build-property-set).get <linkflags> ] ;
            ps-raw += $(l:G=<linkflags>) ;

            # Remove the <tag> feature on original targets.
            ps-raw = [ property.change $(ps-raw) : <tag> ] ;

            # And <location>. If stage target has another stage target in
            # sources, then we shall get virtual targets with the <location>
            # property set.
            ps-raw = [ property.change $(ps-raw) : <location> ] ;
        }

        local d = [ $(build-property-set).get <dependency> ] ;
        ps-raw += $(d:G=<dependency>) ;

        local d = [ $(build-property-set).get <location> ] ;
        ps-raw += $(d:G=<location>) ;

        local ns = [ $(build-property-set).get <install-no-version-symlinks> ] ;
        ps-raw += $(ns:G=<install-no-version-symlinks>) ;

        local d = [ $(build-property-set).get <install-source-root> ] ;
        # Make the path absolute: we shall use it to compute relative paths and
        # making the path absolute will help.
        if $(d)
        {
            d = [ path.root $(d) [ path.pwd ] ] ;
            ps-raw += $(d:G=<install-source-root>) ;
        }

        if $(ps-raw)
        {
            return [ property-set.create $(ps-raw) ]  ;
        }
        else
        {
            return [ property-set.empty ] ;
        }
    }

    rule construct ( name : source-targets * : property-set )
    {
        source-targets = [ targets-to-stage $(source-targets) :
            $(property-set) ] ;

        property-set = [ update-location $(property-set) ] ;

        local ename = [ $(property-set).get <name> ] ;

        if $(ename) && $(source-targets[2])
        {
            import errors : error : $(__name__) : errors.error ;
            errors.error When <name> property is used "in" 'install', only one
                source is allowed. ;
        }

        local result ;
        for local i in $(source-targets)
        {
            local staged-targets ;

            local new-properties = [ adjust-properties $(i) :
                $(property-set) ] ;

            # See if something special should be done when staging this type. It
            # is indicated by the presence of a special "INSTALLED_" type.
            local t = [ $(i).type ] ;
            if $(t) && [ type.registered INSTALLED_$(t) ]
            {
                if $(ename)
                {
                    import errors : error : $(__name__) : errors.error ;
                    errors.error In "'install':" <name> property specified with
                        target that requires relinking. ;
                }
                else
                {
                    local targets = [ generators.construct $(self.project)
                        $(name) : INSTALLED_$(t) : $(new-properties) : $(i) ] ;
                    staged-targets += $(targets[2-]) ;
                }
            }
            else
            {
                staged-targets = [ stage.copy-file $(self.project) $(ename) :
                    $(i) : $(new-properties) ] ;
            }

            if ! $(staged-targets)
            {
                import errors : error : $(__name__) : errors.error ;
                errors.error Unable to generate staged version of
                    [ $(source).str ] ;
            }

            for t in $(staged-targets)
            {
                result += [ virtual-target.register $(t) ] ;
            }
        }

        return [ property-set.empty ] $(result) ;
    }

    # Given the list of source targets explicitly passed to 'stage', returns the
    # list of targets which must be staged.
    #
    rule targets-to-stage ( source-targets * : property-set )
    {
        local result ;

        # Traverse the dependencies, if needed.
        if [ $(property-set).get <install-dependencies> ] = "on"
        {
            source-targets = [ collect-targets $(source-targets) ] ;
        }

        # Filter the target types, if needed.
        local included-types = [ $(property-set).get <install-type> ] ;
        for local r in $(source-targets)
        {
            local ty = [ $(r).type ] ;
            if $(ty)
            {
                # Do not stage searched libs.
                if $(ty) != SEARCHED_LIB
                {
                    if $(included-types)
                    {
                        if [ include-type $(ty) : $(included-types) ]
                        {
                            result += $(r) ;
                        }
                    }
                    else
                    {
                        result += $(r) ;
                    }
                }
            }
            else if ! $(included-types)
            {
                # Do not install typeless targets if there is an explicit list
                # of allowed types.
                result += $(r) ;
            }
        }

        return $(result) ;
    }

    # CONSIDER: figure out why we can not use virtual-target.traverse here.
    #
    rule collect-targets ( targets * )
    {
        # Find subvariants
        local s ;
        for local t in $(targets)
        {
            s += [ $(t).creating-subvariant ] ;
        }
        s = [ sequence.unique $(s) ] ;

        local result = [ new set ] ;
        $(result).add $(targets) ;

        for local i in $(s)
        {
            $(i).all-referenced-targets $(result) ;
        }
        local result2 ;
        for local r in [ $(result).list ]
        {
            if $(r:G) != <use>
            {
                result2 += $(r:G=) ;
            }
        }
        DELETE_MODULE $(result) ;
        return [ sequence.unique $(result2) ] ;
    }

    rule skip-from-usage-requirements ( )
    {
    }

    # Returns true iff 'type' is subtype of some element of 'types-to-include'.
    #
    local rule include-type ( type : types-to-include * )
    {
        local found ;
        while $(types-to-include) && ! $(found)
        {
            if [ type.is-subtype $(type) $(types-to-include[1]) ]
            {
                found = true ;
            }
            types-to-include = $(types-to-include[2-]) ;
        }

        return $(found) ;
    }
}


# Creates a copy of target 'source'. The 'properties' object should have a
# <location> property which specifies where the target must be placed.
#
rule copy-file ( project name ? : source : properties )
{
    name ?= [ $(source).name ] ;
    local relative ;

    local new-a = [ new non-scanning-action $(source) : common.copy :
        $(properties) ] ;
    local source-root = [ $(properties).get <install-source-root> ] ;
    if $(source-root)
    {
        # Get the real path of the target. We probably need to strip relative
        # path from the target name at construction.
        local path = [ $(source).path ] ;
        path = [ path.root $(name:D) $(path) ] ;
        # Make the path absolute. Otherwise, it would be hard to compute the
        # relative path. The 'source-root' is already absolute, see the
        # 'adjust-properties' method above.
        path = [ path.root $(path) [ path.pwd ] ] ;

        relative = [ path.relative-to $(source-root) $(path) ] ;
    }

    # Note: Using $(name:D=$(relative)) might be faster here, but then we would
    # need to explicitly check that relative is not ".", otherwise we might get
    # paths like '<prefix>/boost/.', try to create it and mkdir would obviously
    # fail.
    name = [ path.join $(relative) $(name:D=) ] ;

    return [ new file-target $(name) exact : [ $(source).type ] : $(project) :
        $(new-a) ] ;
}


rule symlink ( name : project : source : properties )
{
    local a = [ new action $(source) : symlink.ln : $(properties) ] ;
    local t = [ new file-target $(name) exact : [ $(source).type ] : $(project)
        : $(a) ] ;
    return [ virtual-target.register $(t) ] ;
}


rule relink-file ( project : source : property-set  )
{
    local action = [ $(source).action ] ;
    local cloned-action = [ virtual-target.clone-action $(action) : $(project) :
        "" : $(property-set) ] ;
    return [ $(cloned-action).targets ] ;
}


# Declare installed version of the EXE type. Generator for this type will cause
# relinking to the new location.
type.register INSTALLED_EXE : : EXE ;


class installed-exe-generator : generator
{
    import type ;
    import property-set ;
    import modules ;
    import stage ;

    rule __init__ ( )
    {
        generator.__init__ install-exe : EXE : INSTALLED_EXE ;
    }

    rule run ( project name ? : property-set : source : multiple ? )
    {
        local stage-rule = stage.copy-file ;

        if ! [ $(property-set).get <os> ] in NT CYGWIN &&
            ! [ $(property-set).get <target-os> ] in windows cygwin
        {
            # If dll-path properties have been changed for the stage target,
            # relink instead of copying.
            local a = [ $(source).action ] ;
            local p = [ $(a).properties ] ;
            local original = [ $(p).get <dll-path> ] ;
            local current = [ $(property-set).get <dll-path> ] ;

            if $(current) != $(original)
            {
                stage-rule = stage.relink-file ;
            }
        }

        return [ $(stage-rule) $(project) : $(source) : $(property-set) ] ;
    }
}


generators.register [ new installed-exe-generator ] ;


# Installing a shared link on Unix might cause a creation of versioned symbolic
# links.
type.register INSTALLED_SHARED_LIB : : SHARED_LIB ;


class installed-shared-lib-generator : generator
{
    import type ;
    import property-set ;
    import modules ;
    import stage ;

    rule __init__ ( )
    {
        generator.__init__ install-shared-lib : SHARED_LIB :
            INSTALLED_SHARED_LIB ;
    }

    rule run ( project name ? : property-set : source : multiple ? )
    {
        if [ $(property-set).get <os> ] in NT CYGWIN ||
            [ $(property-set).get <target-os> ] in windows cygwin
        {
            local copied = [ stage.copy-file $(project) : $(source) :
                $(property-set) ] ;
            return [ virtual-target.register $(copied) ] ;
        }
        else
        {
            local a = [ $(source).action ] ;
            local copied ;
            if ! $(a)
            {
                # Non-derived file, just copy.
                copied = [ stage.copy-file $(project) : $(source) :
                    $(property-set) ] ;
            }
            else
            {
                local cp = [ $(a).properties ] ;
                local current-dll-path = [ $(cp).get <dll-path> ] ;
                local new-dll-path = [ $(property-set).get <dll-path> ] ;

                if $(current-dll-path) != $(new-dll-path)
                {
                    # Rpath changed, need to relink.
                    copied = [ stage.relink-file $(project) : $(source) :
                        $(property-set) ] ;
                }
                else
                {
                    copied = [ stage.copy-file $(project) : $(source) :
                        $(property-set) ] ;
                }
            }

            copied = [ virtual-target.register $(copied) ] ;

            local result = $(copied) ;
            # If the name is in the form NNN.XXX.YYY.ZZZ, where all 'X', 'Y' and
            # 'Z' are numbers, we need to create NNN.XXX and NNN.XXX.YYY
            # symbolic links.
            local m = [ MATCH
                "(.*)\\.([0123456789]+)\\.([0123456789]+)\\.([0123456789]+)$" :
                [ $(copied).name ] ] ;
            if $(m)
            {
                # Symlink without version at all is used to make
                # -lsome_library work.
                result += [ stage.symlink $(m[1]) : $(project) : $(copied) :
                    $(property-set) ] ;

                # Symlinks of some libfoo.N and libfoo.N.M are used so that
                # library can found at runtime, if libfoo.N.M.X has soname of
                # libfoo.N. That happens when the library makes some binary
                # compatibility guarantees. If not, it is possible to skip those
                # symlinks.
                local suppress = [ $(property-set).get
                    <install-no-version-symlinks> ] ;

                if $(suppress) != "on"
                {
                    result += [ stage.symlink $(m[1]).$(m[2]) : $(project) :
                        $(copied) : $(property-set) ] ;
                    result += [ stage.symlink $(m[1]).$(m[2]).$(m[3]) :
                        $(project) : $(copied) : $(property-set) ] ;
                }
            }

            return $(result) ;
        }
    }
}

generators.register [ new installed-shared-lib-generator ] ;


#| tag::doc[]

. `rule get-dir ( name : property-set : package-name : flags * )`
+
Returns the path to a named installation directory. For a given `name=xyz` the
rule uses the value of `<install-xyz>` property if it is present in
`property-set`. Otherwise it tries to construct the default value of the path
recursively getting the path to ``name``'s registered base named directory and
relative path. For example:
+
[source]
----
stage.add-install-dir foo : bar : baz ;

local ps = [ property-set.create <install-foo>x/y/z ] ;
echo [ stage.get-dir foo : $(ps) : $(__name__) ] ; # outputs x/y/z

ps = [ property-set.create <install-baz>a/b/c/d ] ;
echo [ stage.get-dir foo : $(ps) : $(__name__) ] ; # outputs a/b/c/d/bar
----
+
The argument `package-name` is used to construct the path for named directories
that were registered with `package-suffix` option and also to construct
`install-prefix` when targeting Windows.
+
Available `flags`:
+
* `staged`: take <<bbv2.builtin.features.staging-prefix,`staging-prefix`>> into
  account.
* `relative`: return the path to `name` relative to its base directory.

|# # end::doc[]

rule get-dir ( name : property-set : package-name : flags * )
{
    local result ;

    # We treat the 'prefix' directory in a special way, because it's default
    # is based on the value of <target-os> property.
    if $(name) = prefix
    {
        result = [ get-install-prefix $(property-set) : $(package-name)
            : $(flags) ] ;
    }
    else
    {
        # First, try getting the path for requested directory from properties.
        result = [ $(property-set).get <install-$(name)> ] ;
        local info = [ get-dir-info $(name) : $(package-name) ] ;
        # Otherwise, use the default path. In both cases, it could be a
        # relative path.
        result ?= $(info[1]) ;
        if $(result)
        {
            result = [ path.make $(result) ] ;
        }

        # If there is a base directory, we may need to modify result further.
        if $(info[2])
        {
            local base = [ get-dir $(info[2]) : $(property-set)
                : $(package-name) : $(flags) ] ;
            if relative in $(flags)
            {
                local rel = [ path.relative $(result) $(base) : no-error ] ;
                if not-a-child != $(rel)
                {
                    result = $(rel) ;
                }
            }
            else
            {
                result = [ path.root $(result) $(base) ] ;
            }
        }
    }

    return $(result) ;
}


# For a given named directory returns its parent directory and relative path
local rule get-dir-info ( name : package-name ) {
    local path = $(.dir.$(name)[1]) ;
    if ! x$(path)
    {
        import errors ;
        errors.error $(name) is not an installation directory name. ;
    }

    if package-suffix in $(.dir.$(name).options)
    {
        path = [ path.join $(path) $(package-name) ] ;
    }

    return $(path) $(.dir.$(name)[2]) ;
}


local rule get-install-prefix ( property-set : package-name : flags * )
{
    local prefix ;
    if staged in $(flags)
    {
        prefix = [ $(property-set).get <staging-prefix> ] ;
    }
    prefix ?= [ $(property-set).get <install-prefix> ] ;
    prefix = $(prefix[0]) ;
    prefix ?= [ option.get prefix ] ;
    if ! $(prefix)
    {
        if windows = [ $(property-set).get <target-os> ]
        {
          prefix = C:\\$(package-name) ;
        }
        else
        {
            prefix = /usr/local ;
        }
    }
    return [ path.make $(prefix) ] ;
}


#| tag::doc[]

. `rule get-package-name ( property-set : project-module ? )`
+
Returns the package name that will be used for `install` targets when
constructing installation location. The rule uses the value of
<<bbv2.builtin.features.install-package,`<install-package>`>> property if it's
present in `property-set`. Otherwise it deduces the package name using
``project-module``'s attributes. It traverses the project hierarchy up to the
root searching for the first project with an id. If none is found, the base
name of the root project's location is used. If `project-module` is empty, the
caller module is used (this allows invoking just `[ get-package-name $(ps) ]`
in project jam files).

|# # end::doc[]

rule get-package-name ( property-set : project-module ? )
{
    local package = [ $(property-set).get <install-package> ] ;
    if ! $(package)
    {
        project-module ?= [ CALLER_MODULE 1 ] ;

        local m = $(project-module) ;
        package = [ project.attribute $(m) id ] ;
        while ! $(package)
        {
            m = [ project.attribute $(m) parent-module ] ;
            if ! $(m) { break ; }

            package = [ project.attribute $(m) id ] ;
        }

        if ! $(package)
        {
            local root = [ project.attribute $(project-module) project-root ] ;
            package = [ path.root $(root) [ path.pwd ] ] ;
        }

        package = $(package:B) ;
    }
    return $(package) ;
}


rule stage-translate-path ( feature value : properties * : project-id : project-location )
{
    if $(feature) = <location> && [ MATCH "^\\((.+)\\)(/(.*))?$" : $(value) ]
    {
        return $(value) ;
    }
}


# Main target rule for 'install'.
#
rule install ( name : sources * : requirements * : default-build * )
{
    local project = [ project.current ] ;

    # Unless the user has explicitly asked us to hardcode dll paths, add
    # <hardcode-dll-paths>false in requirements, to override default value.
    if ! <hardcode-dll-paths>true in $(requirements)
    {
        requirements += <hardcode-dll-paths>false ;
    }

    if <tag> in $(requirements:G)
    {
        import errors ;
        errors.user-error The <tag> property is not allowed for the 'install'
            rule. ;
    }

    targets.create-metatarget install-target-class : $(project) : $(name) :
        $(sources) : $(requirements) <translate-path>@stage-translate-path : $(default-build) ;
}


IMPORT $(__name__) : install : : install ;
IMPORT $(__name__) : install : : stage ;
IMPORT $(__name__) : stage-translate-path : : stage-translate-path ;