[ECOS] CDL question

[Grant Edwards <grante at visi dot com>]

I've read through the CDL sections of the component developer's
guide, but I can't figure out what the command is to set a data
flavored option to an expression involving it's default value
or it's current value.

Assume I've got an ecos.ecc file that I generated via an
"ecosconfig new whatever" command.  Now I want to change the
value of CYGBLD_GLOBAL_CFLAGS (which has its default value) to
add "-DFooBar".  This needs to be done in a shell script so
that I can automate the entire build process.  Usually when I
need to make automated changes to ecos.ecc I create a .cdl file
and import it like this:

   cat >.tmp$$.cdl <<EOF
   cdl_option CYGBLD_BUILD_REDBOOT_WITH_GDB {user_value 0}
   cdl_option CYGBLD_BUILD_REDBOOT_WITH_ZLIB {user_value 0}
   EOF
   ecosconfig import .tmp$$.cdl

However, I can't figure out what the TCL expression is for "the
current value of option CYG_WHATEVER".  I thought perhaps something like
   
   option CYGBLD_GLOBAL_CFLAGS {user_value "$CYGBLD_GLOBAL_CFLAGS -DFooBar"}

But that doesn't work.  I'm sure it's something obvious, but
I've never been able to grok TCL no matter how hard I try...

-- 
Grant Edwards
grante@visi.com



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