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c5d034f94c
Patch from Alexey Pakhunov.
What this patch does is allows to match absense of optional feature in
the 'flags' rule. For example:
flags msvc .SETUP <architecture>/<address-model>64 : " x86_amd64" ;
flags msvc .SETUP <architecture>ia64/<address-model> : " x86_ia64" ;
This will produce "x86_amd64" when the <address-model> is set to 64
and <architecture> is not set. Likewise, for <architecture>ia64 and unset
address model.
Without this patch, we'd have two choices:
- adding 'default' to the list of feature values. But that would
add 'architecture-default' to the target path. Ick!
- creating top-level variable .SETUP with default value, and only
matching configurations with fully-specified feature values. But
this won't handle the case above: we really need to check
which one of two features is unspecified.
[SVN r31036]