Mac python binding not compiling with python 3.8/3.9

[mdblack98]

The Macports team has been working hard to add variants to its existing Hamlib port to add support for Python bindings for users on the Mac.

Please see:

https://trac.macports.org/ticket/62580

Here is the status of the new python bindings related variants of the Hamlib port on the Mac:
hamlib WORKS!
hamlib+python2.7 Bindings WORKS!
hamlib+python3.7 Bindings WORKS!
hamlib+python3.8 Bindings FAILS TO BUILD :-(
hamlib+python3.9 Bindings FAILS to BUILD :-(

The problem with the building hamlib with either Python 3.8 or Python 3.9 bindings
appear to stem with a problem with the Hamlib configuration (configure.ac).

In particular, the problem appears to lie in the check at line ​

Hamlib/configure.ac

Line 582 in c660856

AM_PYTHON_CHECK_VERSION([${PYTHON}], [3.8], [pyver_3_8="yes"], [pyver_3_8="no"])

As a result, the compile fails:

CCLD _Hamlib.la
clang: warning: argument unused during compilation: '-pthread'
Undefined symbols for architecture x86_64:
"_PyArg_UnpackTuple", referenced from:
_SwigPyObject_own in hamlibpy_wrap.o
__wrap_rig_debug in hamlibpy_wrap.o
.....
.....
"__Py_NotImplementedStruct", referenced from:
_SwigPyObject_richcompare in hamlibpy_wrap.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [_Hamlib.la] Error 1
make[2]: Leaving directory /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_hamlib/hamlib/work/hamlib-4.1/bindings' make[1]: *** [all] Error 2 make[1]: Leaving directory /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_hamlib/hamlib/work/hamlib-4.1/bindings'
make: *** [all-recursive] Error 1
make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_hamlib/hamlib/work/hamlib-4.1'
Command failed: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_hamlib/hamlib/work/Hamlib-4.1" && /usr/bin/make -j4 -w all
Exit code: 2
Error: Failed to build hamlib: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_hamlib/hamlib/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port hamlib failed
I do hope one of the Hamlib developers can fix this problem so Macports can offer Hamlib for all the variants of the python bindings for Mac users.

73s

Rob
VA2FB

[mdblack98]

After more testing, I can confirm that Hamlib with python 3.9 bindings will compile manually on the Mac if the following lines are removed (or commented out) in configure.ac:

dnl Determine whether to link libpython as it is unneeded for Python >= 3.8

AM_PYTHON_CHECK_VERSION([${PYTHON}], [3.8], [pyver_3_8="yes"], [pyver_3_8="no"])

AS_IF([test x"${pyver_3_8}" = "xyes"],[

PYTHON_LIBS=""

])

py3test.py also runs fine! So it works!

P.S. If one manually changes configure.ac with a text editor, the following commands are needed to compile Hamlib with python3.9 bindings:

autoreconf --install
./configure --with-python-binding --prefix=/usr/local
make
sudo make install

Then run:
PYTHONPATH=/usr/local/lib/python3.9/site-packages:$PYTHONPATH python bindings/py3test.py

I did not test building Hamlib with Python3.8 bindings using the updated configure.ac. But given the changes to configure.ac, I am sure it will also build fine.

Please consider deleting the lines above in configure.ac so Mac users can use Macports to install Hamlib with python 3.8 or 3.9 bindings!