Re: [Boost-users] [boost] [bjam] combinations of options

Subject: Re: [Boost-users] [boost] [bjam] combinations of options
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2016-09-11 23:43:13

AMDG

On 09/07/2016 07:00 PM, Lorenzo Caminiti wrote:
> On Tue, Aug 30, 2016 at 8:26 AM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> 
>> <snip>
>>   Use an alias target with the default-build
>> set to your combination.  (This is how
>> --build-type=complete at the root used to be
>> implemented.)
> 
> I was not able to use alias here... let me show what I tried.
> 
> In my Jamfile I have a feature defined more or less like this:
> 
>     feature.feature x : a b c : composite propagated link-incompatible ;
>     feature.compose <x>a : <define>MACRO_A ;
>     feature.compose <x>b : <define>MACRO_B ;
>     feature.compose <x>c : <define>MACRO_C ;
> 
> So the following will build with feature x equal a, b, and then c:
> 
>     $ bjam x=a,b,c
> 
> Now, I'd like to shortcut the above to just one target named "all_x":
> 
>     $ bjam all_x
> 
> If I try to do that in the Jamfile using:
> 
>     alias all_x : a b c ;
> 
> I get these errors:
> 
>     error: Unable to find file or target named
>     error:     'a'
> 

The second argument should be a list of targets.
a, b, and, c are not targets, they're the
values of a feature.

> If I try instead:
> 
>     alias all_x : : <x>a <x>b <x>c ;
> 

The third argument is the requirements.
What you need to use is the fourth
argument, default-build.

> I also get errors:
> 
>     error: explicitly-specified values of non-free feature <x> conflict
>     error: existing values: a b c
>     error: value from expanding  <x>b : b
> 
> Can such an "all_x" target be defined using alias or some other BJam construct?
> 

The correct way is:
alias all_x : [list of targets to build] : : <x>a <x>b <x>c ;

In Christ,
Steven Watanabe