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From: David Abrahams (dave_at_[hidden])
Date: 2005-06-08 21:51:58

David Abrahams <dave_at_[hidden]> writes:

>> Does it work if you
>> build with
>> bjam asynch-exceptions=on
>> ?
> Nope.

Okay, I fixed this part. The problem was a mistaken dependence on
the base-target-type feature, which I got from the prior state of

1.28 (vladimir 06-Jul-04): flags msvc.compile CFLAGS <base-target-type>CPP : /EHsc ;

I'm not sure how it ever worked, in fact. Can you explain how
<base-target-type>CPP would have ever been satisfied when trying to
produce an OBJ?

>> Also, note that most of the time usage requirements are free features. I'm not
>> sure that propagated features as usage requirements will quite as expected.
>> For example
>> rule copy.cpp /boost/test//minimal some_other_lib ;
>> might propagate asynch-exceptions=on from minimal to 'copy.cpp', but I'm
>> pretty sure it won't be propagated to some_other_lib -- because first all
>> sources are built, and only then usage requirements for all sources are added
>> to build properties.
> Hmm, yes... well, I admit that I would not have expected it to be
> propagated to some_other_lib in that case, but it's also obvious to me
> that it needs to be propagated that way. So this looks like a serious
> architectural problem.

Of course, this part is still a problem, and really needs to be
properly resolved.

Dave Abrahams
Boost Consulting

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