[MacPorts] #64353: opencv3 has undocumented dependencies

[MacPorts]

#64353: opencv3 has undocumented dependencies
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  Reporter:  mouse07410  |      Owner:  mascguy
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  opencv3     |
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Comment (by kencu):

 Replying to [comment:33 mouse07410]:
 > > so do this then:
 > >
 > > {{{
 > > default_compilers clang macports-clang-13 macports-clang-12
 > > }}}
 >
 > Unfortunately, while the above would correctly reflect my preferences -
 it seems to break the compiler selection algorithm


 {{{default_compilers}}} is a bigger stick.

 In each case, base selected your first default compiler.

 the openmp selection mechanism is a bit more subtle. looks like
 default_compilers overrides it.

 To get what you want, which seems to be that you want 99.99% of the
 standard compiler selection mechanism working as it is, but you just want
 the order of macports-compiler-N fallbacks changing, you might be happier
 if you adjusted that list on your system slightly. It lives here:

 https://github.com/macports/macports-
 ports/blob/f26cfe7b3e3961d120d8b6212c219b9a752cddeb/_resources/port1.0/compilers/clang_compilers.tcl#L16

 and just add your macports-clang-13 to the top of your list instead of
 lower down (as it is now0


 > (which IMHO requires some work).

 I find it works exactly the way I would expect it to.

 It's all transparent, and it's all just code. Read {{{portconfigure.tcl}}}
 and it is all sitting there.

 If you have some reproducible examples of how it does not work, I'm sure
 everyone would like to see them.

-- 
Ticket URL: <https://trac.macports.org/ticket/64353#comment:34>
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