I made two different files, Jamroot and rules.jam in the same directory. "rules.jam" has lots of information about building a project. So, "Jamroot" file has to access many variables exist in " rules.jam". Anyway, I used some code below. I palced this code to "rules.jam".
# in "rules.jam"
local CFLAGS = -Wall -O2 ... ;
rule peek ( module-name ? : variables + )
   module-name $(module-name)
     return $($(>)) ;
And I used it by this code in "Jamroot".
# in "Jamfile"
import rules ;
local cflags = [ rules.peek : CFLAGS ] ;
echo $(cflags) ;
But, it didn't make any outputs. Why..?
Does anybody know how to solve it?
Thanks in advance.
Young Hyun.