source: downloads/boost_1_34_1/tools/build/v2/test/module-actions/bootstrap.jam @ 29

# Copyright 2003 Dave Abrahams 
# Copyright 2006 Rene Rivera 
# Distributed under the Boost Software License, Version 1.0. 
# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) 

# Demonstration that module variables have the right effect in actions

# Set a variable which says how to dump a file to stdout
if $(NT)
{ 
    CATENATE = type ;
}
else
{
    CATENATE = cat ;
}

# invoke the given action rule `act' to build target from sources
rule do-make ( target : sources * : act )
{
    DEPENDS $(target) : $(sources) ;
    $(act) $(target) : $(sources) ;
}

# top-level version of do-make which causes target to be built by
# default
rule make ( target : sources * : act )
{
    DEPENDS all : $(target) ;
    do-make $(target) : $(sources) : $(act) ;
}

X1 = X1-global ;
X2 = X2-global ;
X3 = X3-global ;

module A
{
    X1 = X1-A ;
    
    rule act ( target )
    {
        NOTFILE $(target) ;
        ALWAYS $(target) ;
    }
    
    actions act { echo A.act $(<): $(X1) $(X2) $(X3) }
    
    make t1 : : A.act ;
    make t2 : : A.act ;
    make t3 : : A.act ;
}

module B
{
    X2 = X2-B ;
    
    actions act { echo B.act $(<): $(X1) $(X2) $(X3) }
    
    make t1 : : B.act ;
    make t2 : : B.act ;
    make t3 : : B.act ;
}

actions act { echo act $(<): $(X1) $(X2) $(X3) }

make t1 : : act ;
make t2 : : act ;
make t3 : : act ;

X1 on t1 = X1-t1 ;
X2 on t2 = X2-t2 ;
X3 on t3 = X3-t3 ;

DEPENDS all : t1 t2 t3 ;