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Subject: Re: [Boost-build] Conditional updating using NOUPDATE
From: Edward Mitchell (erm410_at_[hidden])
Date: 2013-04-26 09:52:44

On 04/25/2013 12:23 AM, Steven Watanabe wrote:
> On 04/24/2013 09:06 PM, Edward Mitchell wrote:
>> Thank you for your quick response. However, I am not quite sure that
>> what you are saying is different from what I am doing.
> The difference is the level that things happen at.
> actions touch and rule touch both operate on Jam targets,
> which cando.scrape creates Boost.Build metatargets.
> The argument of NOUPDATE is expected to be a list
> of Jam targets. (actions touch and rule touch are
> two parts of the same rule. If both are defined,
> both will be run.)
>> To be clearer I have several jamfiles that all are `using cando` and
>> call the rule `cando.scrape` at parse time. This rule, defined in a
>> toolset module cando.jam, runs the python script and defines the target
>> that I am having trouble with. I thought that by using a toolset module
>> the all uppercase (jam level) rules would be available to use, e.g. I
>> have used "ECHO" and "echo" equally effectively in cando.jam.
> They are available. *However*, the built-in rules
> that operate on targets do *not* work on Boost.Build
> metatargets.
>> Are you saying I need a new main target rule, with a custom file
>> type/generator and everything to make this work? Or am I missing
>> something obvious?
>> To sum up:
>> In jamfile.jam, I have the lines:
>> using cando ;
>> cando.scrape $(__file__:D) ;
>> always scrape_flag.h ;
>> And in cando.jam I have the code posted in the previous email.
>> I am afraid I am terribly confused by all this, I hope you can clear it
>> up for me.
> Please see
> for a discussion of the target layers.
> In Christ,
> Steven Watanabe
> _______________________________________________
> Unsubscribe & other changes:

Thank you again for clearing this up and taking the time to help me! I
was under the impression that rules that took targets could handle any
level of target, not just Jam targets. Things are now working as
expected and I feel a lot more confident about my further efforts to
extend Boost-build to meet the needs of this project.

Thanks again,

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