py37-pyobjc 5.2.0: build failed

[teh-maxh (Max Harmony)]

Port fails to build. The key bit seems to be this:

:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-pyobjc/py37-pyobjc/work/pyobjc-core-5.2" && /opt/local/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 setup.py --no-user-cfg build 

Full log attached for context.

[jmroot (Joshua Root)]

You probably need to be running Xcode 11 on 10.15.

[jmroot (Joshua Root)]

​https://bitbucket.org/ronaldoussoren/pyobjc/issues/274/compile-error-on-python-38-in

Should be fixed in the upcoming release.

[mf2k (Frank Schima)]

Has duplicate #59242.

[andrey-popov (Andrey Popov)]

According to the discussion in the referenced issue in pyobjc and judging from the source code, it should still be possible to build the package providing flag -DOBJC_OLD_DISPATCH_PROTOTYPES=1. Then there is no need to wait for the next release. I don't know MacPorts well enough to test this, though. Could somebody have a look? Note that this port is an (indirect) dependency of Matplotlib, so this is a pretty important problem.

[pmininni (Pablo Mininni)]

I can confirm that manually adding the flag "-DOBJC_OLD_DISPATCH_PROTOTYPES=1" to the list of CFLAGS in setup.py allows the port to build in Catalina with Xcode 11.1.

[mf2k (Frank Schima)]

Has duplicate #59301.

[kprussing (Keith)]

I managed to get this building with the attached Portfile and patch. I had to follow ​the patch file instructions and drop the attached files in a local directory and update the sources.conf according to the ​Local Portfile Repositories page.

[kprussing (Keith)]

Patched Portfile and patch

[vdoublie]

installed fine, added to our own personal repo until proper fix shows up .. THX a whole bunch

[andrey-popov (Andrey Popov)]

Replying to kprussing:

I managed to get this building with the attached Portfile and patch. I had to follow ​the patch file instructions and drop the attached files in a local directory and update the sources.conf according to the ​Local Portfile Repositories page.

Many thanks! The patch works for me as well.

[ednl (Ewoud Dronkert)]

Same problem: failed to build py37-objc on Catalina. And yes, dependency of matplotlib. I want to add, I have no experience with build systems but tried to add -DOBJC_OLD_DISPATCH_PROTOTYPES=1 to CFLAGS in setup.py but either it's not the correct setup.py or I edited it in the wrong place because that didn't work. My actual error is:

File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/_osx_support.py", line 343, in compiler_fixup
    if compiler_so[index] == '-isysroot':
IndexError: list index out of range

which I hadn't seen mentioned.

[mamoll (Mark Moll)]

Modify lines 341-350 of _osx_support.py as follows:

        for index in reversed(indices):
            try:
                if compiler_so[index] == '-isysroot':
                    # Strip this argument and the next one:
                    del compiler_so[index:index+2]
                else:
                    # It's '-isysroot/some/path' in one arg
                    del compiler_so[index:index+1]
            except ValueError:
                break

The reversed call is the critical bit. This makes sure that the right thing happens when you have more than one -isysroot compiler flag.

[jmroot (Joshua Root)]

In 4cc9df431f9f61f3bee09a933b2793f2032c8a2f/macports-ports (master):

py-pyobjc: update to 5.3

Fixes: #59194