[jamming] Escaping in jam

[Chris Tate]

I'm beating my head against this a bit and not making much progress -- i
need to set a Jam variable to be a string that "looks" like a Jam
variable reference.  Backslash and double-quote escaping don't seem to
be working as I expect them to.  I'm using Jam on Windows XP.
 
The end result I'm trying to accomplish is to pass this flag to Borland
C++ Builder:
 
    "-I$(BCB)\Include\Mfc"
 
C++ Builder interprets the *literal* string "$(BCB)" itself; i need to
cause it to be passed unaltered to the compiler invocation.  Various
combinations of backslash escaping or double quoting don't seem to work.
In particular, I find it quite strange that this works:
 
    HDRS += \$\\Include\\Mfc
 
to produce "-I$\Include\Mfc" in the compiler's invocation, but
 
    HDRS += \$\(BCB\)\\Include\\Mfc
 
is apparently *stripped*; no part of that fragment winds up in a -I flag
on the command line.
 
Help?
 
--
chris tate
chris.tate at openwave.com
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