Re: xx-config.jam

From: David Abrahams (dave_at_[hidden])
Date: 2005-05-23 07:05:58

Vladimir Prus <ghost_at_[hidden]> writes:

> On Monday 23 May 2005 07:39, Rene Rivera wrote:
>> David Abrahams wrote:
>> > These things are great!!
>>
>> Thank you :-)
>>
>> > Now, we should really unify them with "using."
>> >
>> > So,
>> >
>> > using msvc ;
>> >
>> > should essentially do
>> >
>> > import msvc-config ;
>>
>> That was my intent.. Never got an answer from Volodya about separating
>> the toolset detection and config from the toolset operation.
>
> Yea, sorry. IIRC, we basically agreed that 'using msvc' should try to
> detect msvc and if found, initialize it. That's what Dave suggests above 
> and it's what 'using msvc' does at the moment ;-), except that:
> 1. It issues a warning if msvc is not found.
> 2. The detection logic in msvc.jam and msvc-config.jam is different.
>
> I think to move further we need to agree that the only two questions are:
> 1. Which detection logic is best

The one using the registry is definitely best.

> 2. Whether we should have one file, that includes the detection logic,
> or a separate xx-config with detection logic.

I don't think that's an important question.

>> > of course we need to get msvc-config.jam to handle vc6.
>>
>> If I had it I could figure it out... Although it's really just a matter
>> of knowing how it sets up the registry when installed.
>>
>> > Also, versions should be registered highest-to-lowest, and we should
>> > implement the ability to do a versionless build, which should pick the
>> > first version registered. So if 8.0 is installed,
>> >
>> > bjam msvc
>> >
>> > should be equivalent to
>> >
>> > bjam msvc-8.0
>> >
>> > Thoughts?
>>
>> I'm all for that.
>
> I think that if 'using msvc' with detect/register 8.0 first, then
>
> bjam msvc
>
> will be the same as
>
> bjam msvc-8.0
>
> by using default properties, automatically. 

I don't understand anything you said, unless it's just a rephrasing of
what I wrote above it.

> There are some details:
>
> * does 'using msvc' initializes all found msvc version? Or only one?

All. It's no cost.

> * what if user issues explicit 'using msvc : 8.0 ....... ' after 8.0
> is already initialized

Then re-initialize it per the request.

Users should always be able to override what their site administrator
does in site-config.jam

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com