libxml2 2.8.0 breaks postgis2 2.0.1

[cmutel (Chris Mutel)]

Installing libxml2 2.8.0 leads to this behaviour:

cocoa=# select postgis_full_version();
ERROR:  could not load library "/opt/local/lib/postgresql91/postgis-2.0.so": dlopen(/opt/local/lib/postgresql91/postgis-2.0.so, 10): Library not loaded: /opt/local/lib/libxml2.2.dylib
  Referenced from: /opt/local/lib/postgresql91/postgis-2.0.so
  Reason: Incompatible library version: postgis-2.0.so requires version 11.0.0 or later, but libxml2.2.dylib provides version 10.0.0

Reverting to 2.7.8 (and forcing a rebuild of postgis2) solves the problem.

I am not wise enough to understand what is breaking here (it could be on either end).

BTW, the most recent version of libxml2 is already 2.9.0.

[jmroot (Joshua Root)]

2.8.0 provides version 11.0.0 here:

% otool -L /opt/local/lib/libxml2.2.dylib
/opt/local/lib/libxml2.2.dylib:
	/opt/local/lib/libxml2.2.dylib (compatibility version 11.0.0, current version 11.0.0)

[cmutel (Chris Mutel)]

OK, so I get the same results:

emerson:~ cmutel$ otool -L /opt/local/lib/libxml2.2.dylib
/opt/local/lib/libxml2.2.dylib:
        /opt/local/lib/libxml2.2.dylib (compatibility version 10.0.0, current version 10.8.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.11)
        /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.5)
        /opt/local/lib/libiconv.2.dylib (compatibility version 8.0.0, current version 8.0.0)
emerson:~ cmutel$ sudo port -n -f deactivate libxml2 @2.7.8_0+universal 
--->  Deactivating libxml2 @2.7.8_0+universal
Warning: Deactivate forced.  Proceeding despite dependencies.
--->  Cleaning libxml2
emerson:~ cmutel$ sudo port activate libxml2 @2.8.0_0+universal
--->  Computing dependencies for libxml2
--->  Activating libxml2 @2.8.0_0+universal
--->  Cleaning libxml2
emerson:~ cmutel$ otool -L /opt/local/lib/libxml2.2.dylib
/opt/local/lib/libxml2.2.dylib:
        /opt/local/lib/libxml2.2.dylib (compatibility version 11.0.0, current version 11.0.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.11)
        /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.7)
        /opt/local/lib/liblzma.5.dylib (compatibility version 6.0.0, current version 6.4.0)
        /opt/local/lib/libiconv.2.dylib (compatibility version 8.0.0, current version 8.1.0)

I guess the problem is then with postgis2 (though it does seem strange...). But I do get this problem consistently, so I guess there is something real here, and not just a problem with my configuration.

[jmroot (Joshua Root)]

Do the architectures match?

port -v installed libxml2 postgis2
lipo -info /opt/local/lib/libxml2.2.dylib /opt/local/lib/postgresql91/postgis-2.0.so

Are any DYLD_* variables set in the environment?

[cmutel (Chris Mutel)]

If no one else is experiencing this bug, it should probably be closed. I guess there is some other confounding configuration parameter on my side.

[anddam (Andrea D'Amore)]

In a similar situation with updated packages (libxml2 2.9 with declared compatibility 12.0.0, dyld complains about postgis-2.0.so requiring 11.0.0) rebuilding postgis2 port fixed the issue.

I'm not sure what's keeping a reference to the older libxml2 version, there's no DYLD_LIBRARY_PATH set and all the other versions of libxml2.2.dylib I can find on the system are declaring compatibility 10.0.0 so dyld wasn't trying to link any of them since the error message explicitly mentions 11.0.0.

Weird and I wouldn't even know how to reproduce it on purpose. I'd close as wontfix or worksforme.

[cooljeanius (Eric Gallager)]

I'd close as wontfix or worksforme.

...so then why'd you reopen it? (not that I mind; just wondering...)

[chuanjiabao1981@…]

I use libxml2 2.9.0 and I have the same problem. I got the error below: "Reason: Incompatible library version: postgis-2.0.so requires version 12.0.0 or later, but libxml2.2.dylib provides version 11.0.0".

[cooljeanius (Eric Gallager)]

Cc Me!

[tim.holahan@…]

I spent several hours wrestling with this today (postgis 2.1 and libxml 2.9.2). I'm not sure why, but forcing the uninstall of both libxml2 and libxslt finally resolved it. I got the idea from this page on nokogiri issues with libxml2:

​https://github.com/sparklemotion/nokogiri/wiki/What-to-do-if-libxml2-is-being-a-jerk

The follow two commands did the job:

sudo port -f uninstall libxml2 libxslt
sudo port install libxml2 libxslt

I hope that helps.

[mf2k (Frank Schima)]

Is this still an issue with postgis2 2.4.2 and libxml2 2.9.7?

[Veence (Vincent)]

I suppose no. Closing this.