[MacPorts] #45274: Run portbuild::build_main once for each build.target

[MacPorts]

#45274: Run portbuild::build_main once for each build.target
--------------------------+--------------------------------
 Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  base          |    Version:  2.3.99
 Keywords:                |       Port:
--------------------------+--------------------------------
 With parallel building, there is the potential for a problem when a port
 sets `build.target` to multiple values, as was experienced for example
 with the faust-devel port in #45241.

 One solution would be to run `portbuild::build_main` once for each
 `build.target`, rather than running it just a single time and passing it
 the entire `build.target` all at once.

-- 
Ticket URL: <https://trac.macports.org/ticket/45274>
MacPorts <http://www.macports.org/>
Ports system for OS X