list ports that depend on a given port

[Joshua Root]

On 2021-6-5 07:29 , Joshua Root wrote:
> Probably this (remember that it's matching the text in each depends_* 
> field in the PortIndex): port echo depends:':boost(\s|$)'
> 
> To allow different matching styles in selectors, we would need some new 
> syntax.

Here's a Tcl implementation of exact matching of dependency port names.

- Josh
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