Re: [Boost-build] Equivalent to Perforce Jam -g

From: David Abrahams (dave_at_[hidden])
Date: 2006-01-20 17:41:17

Nicolas Fleury <nidoizo_at_[hidden]> writes:

> David Abrahams wrote:
>>>Hi everyone,
>>>
>>>Is there any equivalent to -g (build more recent file instead of first 
>>>one met in jamfile) 
>> 
>> I don't understand what that means.  Can you give an example?
>
>  From the doc of Perforce Jam:
> -g: Build targets with the newest sources first, rather than in the 
> order of appearance in the Jambase/Jamfiles.
>
> and:
> The -g flag reorders builds so that targets with newest sources are 
> built first. Normally, they are built in the order of appearance in the 
> Jamfiles.

Ah.

> I don't know how Boost.Jam behaves.  I assumed it was forked from 
> Perforce Jam before introduction of -g flag.

Yep.

> This flag can be useful if you're modifying a .hpp/.cpp pair.  Since the 
> .cpp is more recent than other .cpp depending on the same .hpp, it is 
> the one that will be compiled first, instead of order of appearance in 
> jamfiles.

Yeah, I think I suggested something like this for Scons once.

> It is an interesting setting avoiding the necessity to specify an .obj 
> target manually (and particularly useful since Visual Studio makefile 
> projects don't allow configuration of compilation of a single source file).

Patches are welcome, I'm sure :)

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