conditionals2.py

C++的一个好库。。。现在很流行

#!/usr/bin/python

#  Copyright (C) Vladimir Prus 2003. Permission to copy, use, modify, sell and
#  distribute this software is granted provided this copyright notice appears in
#  all copies. This software is provided "as is" without express or implied
#  warranty, and with no claim as to its suitability for any purpose.

#  Regression test: it was possible that due to evaluation of conditional
#  requirements, two different values of non-free features were present in
#  property set.

from BoostBuild import Tester, List

t = Tester()

t.write("project-root.jam", "")

t.write("a.cpp", "")

t.write("Jamfile", """ 
import feature : feature ;
import common : file-creation-command ;

feature the_feature : false true : propagated ;

rule maker ( targets * : sources * : properties * )
{
    if <the_feature>false in $(properties)
    && <the_feature>true in $(properties)
    {
        EXIT "Oops, two different values of non-free feature" ;
    }    
    CMD on $(targets) = [ file-creation-command ] ;
}

actions maker
{
    $(CMD) $(<) ;
}

make a : a.cpp :  maker : <variant>debug:<the_feature>true ; 
""")

t.run_build_system()

t.cleanup()