Mac OS X 10.7.4 & mod_wsgi.so

[Abilard]

Yesterday I installed Apache 2.4.2 on Mac OS X 10.7.4, creating a plist file to launch it at boot (Apple's built-in web sharing is turned off).  MySQL and PHP were installed next:

PHP 5.3.10 with Suhosin-Patch (cli) 

mysql  Ver 14.14 Distrib 5.5.24, for osx10.6 (i386)

The PHP module (libphp5.so) is running happily.  I then attempted to setup Apache to handle Python through mod_wsgi.so and am encountering the following error when I test the config file:

httpd: Syntax error on line 149 of /usr/local/apache2/conf/httpd.conf: Cannot load /usr/local/apache2/modules/mod_wsgi.so into server: dlopen(/usr/local/apache2/modules/mod_wsgi.so, 10): Symbol not found: _ap_accept_lock_mech\n  Referenced from: /usr/local/apache2/modules/mod_wsgi.so\n  Expected in: flat namespace\n in /usr/local/apache2/modules/mod_wsgi.so

Searching the web turned up these hypotheses as to what might cause errors of this kind:

1. Mixing 64-bit Apache and 32-bit Python.
   
2. Running old versions of Python.
   
3. Having multiple versions of Apache.
   
4. Not using MacPorts.
   
5. Not using HomeBrew.
   
6. Not using Linux.
   

I've attempted forcing Apache to run in 32-bit mode; putting Python 3.2 in the path; specifying apxs2 & python during configure; altering the Makefile to ensure proper architecture; using MacPorts; installing HomeBrew and running the other way; and half a dozen other things I have forgotten now to no avail.  As for #6, my Ubuntu dev box is running mod_python just fine.  My goal is getting my MacBook Pro to run mod_wsgi.so (which, I gather, is now preferred over mod_python).

Any ideas?

[Graham Dumpleton]

You cannot use mod_wsgi 3.3 source code or precompiled binary, you need to use 3.X or 4.X branches from mod_wsgi source code repository. What code or binary were you using?

Graham

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[Kevin King]

Most of my attempts were with version 3.3, though at one point I did install Mercurial and pull the latest from source.  No luck there either, though I do not recall whether the error for that one differed.  So perhaps I should limit my efforts to the latest from the repository?

Kevin

[Kevin King]

I re-ran the code from the Mercurial clone (last modified Mon May 07 17:15:19 2012 +1000; 4.0-trunk) and the similar error resulted:

sh-3.2# /usr/local/apache2/bin/apachectl -t

httpd: Syntax error on line 149 of /usr/local/apache2/conf/httpd.conf: Cannot load /usr/local/apache2/modules/mod_wsgi.so into server: dlopen(/usr/local/apache2/modules/mod_wsgi.so, 10): Symbol not found: __Py_FalseStruct\n  Referenced from: /usr/local/apache2/modules/mod_wsgi.so\n  Expected in: flat namespace\n in /usr/local/apache2/modules/mod_wsgi.so

This time it is not finding " __Py_FalseStruct" while version 3.3 was having issues with "__ap_accept_lock_mech".  Not sure if this can be interpreted as progress, but perhaps it is a clue.  ;-)

Kevin

[Graham Dumpleton]

At a guess you have multiple Python versions installed and not using
the standard default Apple Python version.

When you configure mod_wsgi before building, add the configure option:

--disable-framework

Framework linking seems to have been screwed up again on Lion for non
default Python versions and need to use more traditional UNIX -L
linking style.

Graham

[Abilard]

Still getting the same error:

sh-3.2# ./configure --with-apxs=/usr/local/apache2/bin/apxs --with-python=/Library/Frameworks/Python.framework/Versions/2.7/bin/python --disable-framework

checking Apache version... 2.4.2

configure: creating ./config.status

config.status: creating Makefile

sh-3.2# make

make: Nothing to be done for `all'.

sh-3.2# make install

/usr/local/apache2/bin/apxs -i -S LIBEXECDIR=/usr/local/apache2/modules -n 'mod_wsgi' mod_wsgi.la

/usr/local/apache2/build/instdso.sh SH_LIBTOOL='/usr/share/apr-1/build-1/libtool' mod_wsgi.la /usr/local/apache2/modules

/usr/share/apr-1/build-1/libtool --mode=install install mod_wsgi.la /usr/local/apache2/modules/

libtool: install: install .libs/mod_wsgi.so /usr/local/apache2/modules/mod_wsgi.so

libtool: install: install .libs/mod_wsgi.lai /usr/local/apache2/modules/mod_wsgi.la

libtool: install: install .libs/mod_wsgi.a /usr/local/apache2/modules/mod_wsgi.a

libtool: install: chmod 644 /usr/local/apache2/modules/mod_wsgi.a

libtool: install: ranlib /usr/local/apache2/modules/mod_wsgi.a

ranlib: file: /usr/local/apache2/modules/mod_wsgi.a(wsgi_apache.o) has no symbols

libtool: install: warning: remember to run `libtool --finish /usr/libexec/apache2'

chmod 755 /usr/local/apache2/modules/mod_wsgi.so

sh-3.2# libtool --finish /usr/libexec/apache2

libtool: unknown option character `-' in: --finish

Usage: libtool -static [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] [-sacLT]

Usage: libtool -dynamic [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] [-o output] [-install_name name] [-compatibility_version #] [-current_version #] [-seg1addr 0x#] [-segs_read_only_addr 0x#] [-segs_read_write_addr 0x#] [-seg_addr_table <filename>] [-seg_addr_table_filename <file_system_path>] [-all_load] [-noall_load]

sh-3.2# otool -L /usr/local/apache2/modules/mod_wsgi.so 

/usr/local/apache2/modules/mod_wsgi.so:

/Library/Frameworks/Python.framework/Versions/2.7/Python (compatibility version 2.7.0, current version 2.7.0)

/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 635.19.0)

/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)

sh-3.2# /usr/local/apache2/bin/apachectl -t

httpd: Syntax error on line 149 of /usr/local/apache2/conf/httpd.conf: Cannot load /usr/local/apache2/modules/mod_wsgi.so into server: dlopen(/usr/local/apache2/modules/mod_wsgi.so, 10): Symbol not found: __Py_FalseStruct\n  Referenced from: /usr/local/apache2/modules/mod_wsgi.so\n  Expected in: flat namespace\n in /usr/local/apache2/modules/mod_wsgi.so

Unless you can spot obvious errors in the above, I think I will simplify my environment and reconfigure using the version of Apache that Apple ships this weekend.  Thank you for your time and input.

Kevin  

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[Graham Dumpleton]

Make sure you do a:

make distclean

before running configure and rebuilding.

Graham

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[Abilard]

Aye caramba!  That did it.  Excuse me while I go outside and scream.

Kevin

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