#  Copyright (c) 2004 Vladimir Prus.
#
#  Use, modification and distribution is subject to the Boost Software
#  License Version 1.0. (See accompanying file LICENSE.txt or
#  https://www.bfgroup.xyz/b2/LICENSE.txt)

#  This file implements linking semantic common to all unixes. On unix, static
#  libraries must be specified in a fixed order on the linker command line. Generators
#  declared there store information about the order and use it property.

import feature ;
import "class" : new ;
import generators ;
import type ;
import set ;
import order ;
import builtin ;

class unix-linking-generator : linking-generator
{
    import property-set ;
    import type ;
    import unix ;

    rule __init__ ( id
        composing ? : # Specify if generator is composing. The generator will be
        # composing if non-empty string is passed, or parameter is
        # not given. To make generator non-composing, pass empty
        # string ("")
        source-types + : target-types + :
        requirements * )
    {
        composing ?= true ;
        generator.__init__ $(id) $(composing) : $(source-types) : $(target-types) :
          $(requirements) ;
    }

    rule run ( project name ? : property-set : sources + )
    {
        local result = [ linking-generator.run $(project) $(name) : $(property-set)
          : $(sources) ] ;

        unix.set-library-order $(sources) : $(property-set) : $(result[2-]) ;

        return $(result) ;
    }

    rule generated-targets ( sources + : property-set : project name ? )
    {
        local sources2 ;
        local libraries ;
        for local l in $(sources)
        {
            if [ type.is-derived [ $(l).type ] LIB ]
            {
                libraries += $(l) ;
            }
            else
            {
                sources2 += $(l) ;
            }
        }

        sources = $(sources2) [ unix.order-libraries $(libraries) ] ;

        return [ linking-generator.generated-targets $(sources) : $(property-set)
          : $(project) $(name) ] ;
    }

}

class unix-archive-generator : archive-generator
{
    import unix ;

    rule __init__ ( id composing ? : source-types + : target-types + :
        requirements * )
    {
        composing ?= true ;
        archive-generator.__init__ $(id) $(composing) : $(source-types) : $(target-types) :
          $(requirements) ;
    }

    rule run ( project name ? : property-set : sources + )
    {
        local result = [ archive-generator.run $(project) $(name) : $(property-set)
          : $(sources) ] ;

        unix.set-library-order $(sources) : $(property-set) : $(result[2-]) ;

        return $(result) ;

    }
}

class unix-searched-lib-generator : searched-lib-generator
{
    import unix ;
    rule __init__ ( * : * )
    {
        generator.__init__
          $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ;
    }

    rule optional-properties ( )
    {
        return $(self.requirements) ;
    }

    rule run ( project name ? : property-set : sources * )
    {
        local result = [ searched-lib-generator.run $(project) $(name)
          : $(property-set) : $(sources) ] ;

        unix.set-library-order $(sources) : $(property-set) : $(result[2-]) ;

        return $(result) ;
    }
}

class unix-prebuilt-lib-generator : generator
{
    import unix ;
    rule __init__ ( * : * )
    {
        generator.__init__ $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ;
    }

    rule run ( project name ? : property-set : sources * )
    {
        local f = [ $(property-set).get <file> ] ;
        unix.set-library-order-aux $(f) : $(sources) ;
        return $(f) $(sources) ;
    }
}

generators.register
  [ new unix-prebuilt-lib-generator unix.prebuilt : : LIB
      : <file> <toolset>unix ] ;

generators.override unix.prebuilt : builtin.lib-generator ;


# Declare generators
generators.register [ new unix-linking-generator unix.link : LIB OBJ : EXE
    : <toolset>unix ] ;

generators.register [ new unix-archive-generator unix.archive : OBJ : STATIC_LIB
    : <toolset>unix ] ;

generators.register [ new unix-linking-generator unix.link.dll : LIB OBJ : SHARED_LIB
    : <toolset>unix ] ;

generators.register [ new unix-searched-lib-generator
   unix.searched-lib-generator : : SEARCHED_LIB : <toolset>unix ] ;


# The derived toolset must specify their own actions.
actions link {
}

actions link.dll {
}

actions archive {
}

actions searched-lib-generator {
}

actions prebuilt {
}





.order = [ new order ] ;

rule set-library-order-aux ( from * : to * )
{
    for local f in $(from)
    {
        for local t in $(to)
        {
            if $(f) != $(t)
            {
                $(.order).add-pair $(f) $(t) ;
            }
        }
    }
}

rule set-library-order ( sources * : property-set : result * )
{
    local used-libraries ;
    local deps = [ $(property-set).dependency ] ;
    for local l in $(sources) $(deps:G=)
    {
        if [ $(l).type ] && [ type.is-derived [ $(l).type ] LIB ]
        {
            used-libraries += $(l) ;
        }
    }

    local created-libraries ;
    for local l in $(result)
    {
        if [ $(l).type ] && [ type.is-derived [ $(l).type ] LIB ]
        {
            created-libraries += $(l) ;
        }
    }

    created-libraries = [ set.difference $(created-libraries) : $(used-libraries) ] ;
    set-library-order-aux $(created-libraries) : $(used-libraries) ;
}

rule order-libraries ( libraries * )
{
    local r = [ $(.order).order $(libraries) ] ;
    return $(r) ;
}