Automatic port replacement

[Joshua Root]

On 19/2/2024 00:49, Karl-Michael Schindler wrote:
> I have a series of cross compilers which conflict with each other. Therefore, only one should be installed and installing one should replace the installed one with a Y/n question. How can I achieve this?
> 
> This is my current snippet with non-essentials removed:
> 
> foreach subarch {25 35 4 5 51 6} {
>      subport “fpc-cross-avr${subarch}-embedded" {
>          conflicts {
>              fpc-cross-avr25-embedded
>              fpc-cross-avr35-embedded
>              fpc-cross-avr4-embedded
>              fpc-cross-avr5-embedded
>              fpc-cross-avr51-embedded
>              fpc-cross-avr6-embedded
>          }
>          replaced_by {
>              fpc-cross-avr25-embedded
>              fpc-cross-avr35-embedded
>              fpc-cross-avr4-embedded
>              fpc-cross-avr5-embedded
>              fpc-cross-avr51-embedded
>              fpc-cross-avr6-embedded
>          }
>          build.args        CPU_TARGET=avr OS_TARGET=embedded SUBARCH=avr${subarch}
>          destroot.args   CPU_TARGET=avr OS_TARGET=embedded SUBARCH=avr${subarch}
>      }
> }
> 
> But it does not work as intended. Any hints?

The braces mean that you're only passing a single value to conflicts and 
replaced_by. If you want to split the setting of a multi-valued option 
over multiple lines, use backslash line continuations.

You can't use multiple values for replaced_by currently, and if we did 
add support for that, the semantics would probably be that all the 
listed ports should be installed as the replacement for the current 
port. You don't want to set replaced_by in a port that you intend to be 
installable in its own right.

The best solution would be to make the subports not conflicting, but if 
that can't be achieved, you probably want something like this:

set subarchs [list 25 35 4 5 51 6]
set subnames [lmap s ${subarchs} {string cat fpc-cross-avr${s}-embedded}]
foreach subarch ${subarchs} subname ${subnames} {
     subport ${subname} {
         conflicts {*}[ldelete ${subnames} ${subname}]
         build.args        CPU_TARGET=avr OS_TARGET=embedded 
SUBARCH=avr${subarch}
         destroot.args   CPU_TARGET=avr OS_TARGET=embedded 
SUBARCH=avr${subarch}
     }
}

- Josh