[MacPorts] #61327: py-rpy2 build fails with clang: error: unsupported option '-fopenmp'

[MacPorts]

#61327: py-rpy2 build fails with clang: error: unsupported option '-fopenmp'
------------------------+----------------------
  Reporter:  essandess  |      Owner:  stromnov
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.3
Resolution:             |   Keywords:
      Port:  py-rpy2    |
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Comment (by kencu):

 Here we go. Once we open up the openmp can of worms, we have to follow
 whereever it all leads. This means sorting out that anything that leaves
 flags behind in pkgconfig files, etc, needs to somehow always force an
 openmp compiler to be used with anything that might ever access those
 pkgconfig files, and we have no such mechanism in place at present.

 And because no Apple clang compilers can use the openmp flags, they all
 fail.

 And Ryan has made it clear he does not want every build to be forced to a
 macports clang compiler as that causes the drives on the buildbots to die
 prematurely due to all the installing and uninstalling of macports-
 clang-9.0 (or whichever is the head of the line at that time).

 And this is indeed how we came to disable openmp in virtually all builds,
 until Apple clangs supported openmp (which we all thought might happen
 before now, but has not happened).

 I would suggest we go back to disabling openmp for 99.99% of cases, unless
 people can sort this out for a specific lonely build, in a specific case,
 that can affect no other software.

-- 
Ticket URL: <https://trac.macports.org/ticket/61327#comment:4>
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