py-rpy2 build fails with clang: error: unsupported option '-fopenmp'

[essandess (Steve Smith)]

Build of py-rp2 is passing a bad flag to clang:

:info:build /usr/bin/clang -bundle -undefined dynamic_lookup -L/opt/local/lib -W
l,-headerpad_max_install_names -Wl,-syslibroot,/Library/Developer/CommandLineToo
ls/SDKs/MacOSX10.15.sdk -isysroot/Applications/Xcode.app/Contents/Developer/Plat
forms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk build/temp.macosx-10.15-x86
_64-3.7/build/temp.macosx-10.15-x86_64-3.7/_rinterface_cffi_api.o -L/opt/local/l
ib -L/opt/local/lib -lpcre2-8 -llzma -lbz2 -lz -ldl -lm -liconv -licuuc -licui18
n -o build/lib.macosx-10.15-x86_64-3.7/_rinterface_cffi_api.abi3.so -fopenmp -Wl
,-headerpad_max_install_names -Wl,-syslibroot,/Applications/Xcode.app/Contents/D
eveloper/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -arch x86_64 -
F/opt/local/Library/Frameworks/R.framework/.. -framework R
:info:build clang: error: unsupported option '-fopenmp'

While we're at it, this could use a version bump, and delete obsolete python versions:

port livecheck py-rpy2
py-rpy2 seems to have been updated (port version: 3.3.5, new version: 3.3.6)

[chrstphrchvz (Christopher Chavez)]

I don't see in rpy2 source code where it uses OpenMP, so I'm not sure whether it should be forced to use an OpenMP-capable compiler (by setting compiler.openmp_version). I wonder if this is due to the +openmp variant recently added and made default in the R port (#61256) and if that is leaving behind -fopenmp as a flag for R extensions to compile with (possibly assuming that extensions will be compiled using the same compiler as R itself).

[kencu (Ken)]

Once we open up the openmp issue, we have to follow wherever it leads. The issue has been that software that leaves openmp flags behind in pkgconfig files, etc, needs to always force an openmp compiler to be used with anything that might access those pkgconfig files, and we have no mechanism in place at present for one port to force another to do that.

And because no Apple clang compilers can use the openmp flags (when last I tested), they all fail.

[essandess (Steve Smith)]

Please see ​https://github.com/macports/macports-ports/pull/11305

[essandess (Steve Smith)]

In b4aa8b2166a93b177815077c912a3df9d0d58d0d/macports-ports (master):

py-rpy2: Update to version 3.4.5, Remove Python 35, Add Python 39, Bugfix

• Update to version 3.4.5
• Remove Python 35
• Add Python 39
• Fixes: #61327