[MacPorts] #68189: opencv4 @4.6.0 +contrib+eigen+java+nonfree+opencl+openmp+qt5+tbb+vtk: build failure related to ceres-solver: cannot initialize a parameter of type 'LocalParameterization*' with an lvalue of type 'ceres::SubsetManifold*'

[MacPorts]

#68189: opencv4 @4.6.0 +contrib+eigen+java+nonfree+opencl+openmp+qt5+tbb+vtk: build
failure related to ceres-solver: cannot initialize a parameter of type
'LocalParameterization*' with an lvalue of type 'ceres::SubsetManifold*'
----------------------+----------------------
  Reporter:  Gandoon  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  opencv4  |
----------------------+----------------------

Comment (by Gandoon):

 Replying to [comment:3 mascguy]:
 > Based on the log, you have Xcode/CLT 12.4 installed. And that release
 ships with the macOS 11 SDK, rather than 10.15, which can definitely cause
 issues.
 >
 > The latest Xcode/CLT release with the 10.15 SDK, is 12.1. So I'd
 strongly recommend that you downgrade both the CLT and Xcode to that
 version, before going any further.

 I have been using that combination of Xcode/CLT for many years now, it has
 never been an issue so far. Can you point to what would be the actual
 issues with using the newer Xcode/CLT? The point of having the setup I
 have is to be able to build for both MacOS 10.15 and 11.n (as far as I
 know, that is the reason why it was released for 10.15 back when it was
 the latest and greatest). I do have my doubts that this should be the
 problem as as recently as July this year I built opencv4 with this exact
 setup:
 {{{
 $ port -v installed opencv4
 The following ports are currently installed:
   opencv4 @4.6.0_11+contrib+eigen+java+nonfree+opencl+openmp+qt5+tbb+vtk
 (active)
 requested_variants='+contrib+eigen+java+nonfree+opencl+openmp+qt5+tbb+vtk'
 platform='darwin 19' archs='x86_64' date='2023-07-26T14:15:21+0200'
 }}}

 I would prefer to not downgrade anything as there is an obvious risk that,
 despite the original intended Xcode/CLT for 10.15 was 12.1, such an action
 could break more than it fixes. The 10.15 SDKs are available and linked
 to.

 By repeating `port -v upgrade opencv4` I manage to arrive at roughly 98%
 built and the Ceres error being one of the last hurdles to cross.

-- 
Ticket URL: <https://trac.macports.org/ticket/68189#comment:4>
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