Re: [Boost-build] BUG intel toolset causes ambiguity in named prebuild library

From: Daniel Einspanjer (deinspanjer_at_[hidden])
Date: 2006-02-01 20:05:25

I'm getting a similar error when trying to source a <file> using the 
intel-linux toolset.

Is there any chance the line in intel-linux.jam:
    generators.override builtin.lib-generator : intel-linux.prebuilt ;
should be
    generators.override builtin.prebuilt : intel-linux.prebuilt ;
instead?

I did try making that change and it fixed my error, but I honestly don't 
know enough about the system yet to know if I will blow up down the road 
because of it.

Daniel

"Vladimir Prus" <ghost_at_[hidden]> wrote in message 
news:200506160955.00691.ghost_at_cs.msu.su...
> Hi Michael,
>
>> Just stumbled across a fairly recently introduced bug. The latest HEAD 
>> has
>> problems with the following simple test case.
>>
>> lib lapack2 : : <name>lapackD <variant>debug : : ;
>> lib lapack2 : : <name>lapackR <variant>release : : ;
>>
>>
>> This is fine in itself. The problem only crops up when the 'intel' 
>> toolset
>> is used. i.e.
>> bjam intel
>>
>> Fails with the error
>>  generators.jam:1079: in construct-really from module generators
>> error: Ambiguity found when searching for best transformation
>
> Yea. (Hint: if you get error in generators.jam, the --debug-generators 
> option
> can provide interesting information).
>
> The reason for this error is that there are two generators that can handle 
> the
> above. First is fully generic generator that just produces a target. 
> Second
> is a generator intel-linux.searched-lib-generator that has some additional
> logic (having to do with library order of link line).
>
> Until recently, both generators were run. But they produced the same 
> targets,
> so no ambiguity ware reported. I've recently changed the check so that
> whenever two generators can be run and both produce something, it's an 
> error.
> That's what you see.
>
> I've just committed a patch that uses generators.override rule to specify 
> that
> intel-linux.searched-lib-generator should be preferred over generic
> searched-lib-generator in all cases, so now only one generator is run, and
> everything should be OK. And I think it's a bit faster (tiny bit, but 
> anyway).
>
> Thanks for the report!
>
> - Volodya
>
> -- 
> Vladimir Prus
> http://vladimir_prus.blogspot.com
> Boost.Build V2: http://boost.org/boost-build2
>
>
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