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From: Deane Yang (deane_yang_at_[hidden])
Date: 2007-11-02 18:24:43

Vladimir Prus wrote:
> Deane Yang wrote:
>> Can we try to be more specific?
>> If you run bjam without explicit settings, then it should indeed try to
>> figure out what the most reasonable thing to do is. But I would love it
>> if bjam could report what it is choosing, so I can see if I am getting
>> something I don't want. It is not uncommon for me to accidentally
>> compile different libraries with slightly different settings and run
>> into real difficulties when I try to use them together in one project.
> This (high-level report of what is built) is something we can add.

Great! Can it be put in the queue somewhere?

>> If you run bjam with explicit settings, for example what Robert
>> originally tried:
>> --toolset=msvc-7.1 threading=single variant=debug,release
>> and bjam decides that it is impossible to deliver exactly what is
>> requested (in this case, single threading with shared runtime), then is
>> it not unreasonable for bjam to simply quit with a message saying "what
>> you requested is not possible", along with a suggestion on what might
>> work?
> This might work in simple cases, but might not work in complex ones.
> Suppose you have a project with line 100 libraries. One of them should
> always be static. If you say on command line:
> link=shared,static
> do you still want an error message? Probably, when requesting a specific
> target, we can error or warn if the required properties cannot be obtained. Making
> build error out in general when some target needs to impose its requirements seems
> not very useful.

Try #2: Have two options:

Option #1: Do the run but give warning messages when something cannot be

Option #2: Stop the run and give an error message when something cannot
be done

One option should be the default and the other should be available
through a command-line switch.

I would of course prefer Option #2 to be the default, and surely that
would be the most common situation for bjam users?

But I'll live with either.

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