Re: [Boost-build] Seleting alternatives based on multiple conditions

From: Emil Dotchevski (emildotchevski_at_[hidden])
Date: 2006-03-10 18:54:12

I understand the example is incomplete, and I understand that I would have 
to add alternatives for the other toolsets, however I think this would be a 
problem only when (if) I attempt to use other toolsets.

With this example, all I am trying to achieve is to have boost-build give me 
an error saying that it can't find a1.lib or a2.lib. Instead, it complains 
about not having enough information to pick between the two alternatives, 
which I think is a bug.

--Emil

----- Original Message ----- 
From: "Daniel Einspanjer" <deinspanjer_at_[hidden]>
To: <boost-build_at_[hidden]>
Sent: Friday, March 10, 2006 12:06 PM
Subject: Re: [Boost-build] Seleting alternatives based on multiple 
conditions

> "Emil Dotchevski" <emildotchevski_at_[hidden]> wrote in message
> news:BAY102-DAV4F43D93A055AFFA38DD1CD4ED0_at_phx.gbl...
>>OK, I separated a simple test case completely outside of my source code
>>tree. I believe the only thing that's used from my usual configuration is
>>site-config.jam, with the following content:
>>
>>import toolset : using ;
>>using msvc : 8.0 ;
>>using msvc : 7.1 ;
>>using gcc ;
>>using como-win ;
>>
>>I simplified my test case to the point of only distinguishing between
>>msvc-7.1 and msvc-8.0, that is, I don't have the additional alternatives
>>for
>><release> or <debug>.
>>
>>So, in this isolated folder I have a single file, jamroot, with the
>>following in it:
>>
>>lib a : : <toolset>msvc-7.1 <file>a1 ;
>>lib a : : <toolset>msvc-8.0 <file>a2 ;
>>exe b : a ;
>>
>>I launch bjam like so:
>>
>>bjam variant=release toolset=msvc-7.1 -n
>
> One thing I notice is that it looks like you expect to be able to use gcc 
> or
> como-win as toolsets, but you provide no alternative for them.  I believe 
> at
> the very least, you should have an empty alias if those toolsets require 
> no
> support lib a. Obviously, that wouldn't work properly in this testcase 
> since
> exe b has no extra source files.
>
> alias a ;
> lib a : : <toolset>msvc-7.1 <file>a1 ;
> lib a : : <toolset>msvc-8.0 <file>a2 ;
>
> exe b : b.cpp a ;
>
>
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