Seems like an issue with bundler. I figured out how to do the dot graphs, 
and it turns out adding `bundle exec` into the command adds a dependency on 
every other file in the directory.
As a matter of fact doing `./noop.rb` on any of those files triggers a 
rebuild.
I'll try to look into bundler to see where it tries to read each file in 
the directory.

On Friday, February 6, 2015 at 10:43:03 PM UTC+1, Freddie Chopin wrote:
>
> On 02/06/2015 10:29 PM, Petr Skočík wrote: 
> > Hi, 
> > How can I do this please? 
> > I'd like to be able to add new rules or remove old ones, and I don't 
> > want this to mark every other target as outdated. 
> > I tried resetting the timestamp to its original value as it was before 
> > I opened the Tupfile for writing, but even so rebuilding gets 
> > triggered for all targets (even if I just open it for writing, close 
> > it, and restore the original atime and mtime). 
>
>  From what I know as long as you don't change* the rules for these 
> "every other targets" they should _NOT_ be rebuilt - tup will check what 
> changed and do only the necessary minimum of work that has to be done. 
>
> If your experience is different, then there must be something wrong - 
> post a minimal example and we'll take a look. 
>
> Regards, 
> FCh 
>
> * "change" as an actual modification to the command, not just some 
> formatting, saving of Tupfiles or stuff like that - there has to be a 
> change that makes the command string different from what it was previously 
>

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