feature.jam: Need help with subfeatures

From: Vladimir Prus (ghost_at_[hidden])
Date: 2002-11-27 05:56:31

Dave,
suppose I have feature "gcc" and subfeature version,
with values 2.95.2 and 3.2. I think it's reasonable
to type

bjam gcc-3.2

in the command line. But then, the command line
parsing code has to tell if "gcc-3.2" is property
or a target. How can I do that? The 'is-implied-value'
rule returns false for 'gcc-3.2' and I see no other
way.

Another remark: I found the comment on 'extend-subfeature'
very hard to understand. Especially

"the subvalues are specific to the given value of the feature"

The comment for 'value-string' parameter of 'subfeature' rule
is much more clear for me.

- Volodya