[MacPorts] #28703: Python 2.6 (Universal) does not honor 'arch -i386' command at runtime

[MacPorts]

#28703: Python 2.6 (Universal) does not honor 'arch -i386' command at runtime
-----------------------------+----------------------------------------------
 Reporter:  tcwan@…          |       Owner:  mcalhoun@…           
     Type:  defect           |      Status:  new                  
 Priority:  Normal           |   Milestone:                       
Component:  ports            |     Version:  1.9.2                
 Keywords:                   |        Port:  python26             
-----------------------------+----------------------------------------------
Changes (by jmr@…):

  * owner:  macports-tickets@… => mcalhoun@…
  * port:  => python26


Old description:

> I have built Python 2.6 and 2.7 with +universal. I need to execute 32-bit
> Python for a specific module.
>
> tcmac$ file /opt/local/bin/python2.*
> /opt/local/bin/python2.6:        Mach-O universal binary with 2
> architectures
> /opt/local/bin/python2.6 (for architecture x86_64):     Mach-O 64-bit
> executable x86_64
> /opt/local/bin/python2.6 (for architecture i386):       Mach-O executable
> i386
> /opt/local/bin/python2.6-config: a /opt/local/Library/Frameworks/P script
> text executable
> /opt/local/bin/python2.7:        Mach-O universal binary with 2
> architectures
> /opt/local/bin/python2.7 (for architecture x86_64):     Mach-O 64-bit
> executable x86_64
> /opt/local/bin/python2.7 (for architecture i386):       Mach-O executable
> i386
> /opt/local/bin/python2.7-config: a /opt/local/Library/Frameworks/P script
> text executable
>
> However, when using the arch command to specify the runtime architecture,
> only Python 2.7 honors this, it does not work with Python 2.6.
>
> tcmac$ arch -i386 /opt/local/bin/python2.6
> Python 2.6.6 (r266:84292, Mar  4 2011, 09:28:43)
> [GCC 4.2.1 (Apple Inc. build 5664)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import sys
> >>> print sys.maxsize
> 9223372036854775807
> >>>
> tcmac$ arch -i386 /opt/local/bin/python2.7
> Python 2.7.1 (r271:86832, Mar  1 2011, 09:22:53)
> [GCC 4.2.1 (Apple Inc. build 5664)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import sys
> >>> print sys.maxsize
> 2147483647
> >>>

New description:

 I have built Python 2.6 and 2.7 with +universal. I need to execute 32-bit
 Python for a specific module.
 {{{
 tcmac$ file /opt/local/bin/python2.*
 /opt/local/bin/python2.6:        Mach-O universal binary with 2
 architectures
 /opt/local/bin/python2.6 (for architecture x86_64):     Mach-O 64-bit
 executable x86_64
 /opt/local/bin/python2.6 (for architecture i386):       Mach-O executable
 i386
 /opt/local/bin/python2.6-config: a /opt/local/Library/Frameworks/P script
 text executable
 /opt/local/bin/python2.7:        Mach-O universal binary with 2
 architectures
 /opt/local/bin/python2.7 (for architecture x86_64):     Mach-O 64-bit
 executable x86_64
 /opt/local/bin/python2.7 (for architecture i386):       Mach-O executable
 i386
 /opt/local/bin/python2.7-config: a /opt/local/Library/Frameworks/P script
 text executable
 }}}
 However, when using the arch command to specify the runtime architecture,
 only Python 2.7 honors this, it does not work with Python 2.6.
 {{{
 tcmac$ arch -i386 /opt/local/bin/python2.6
 Python 2.6.6 (r266:84292, Mar  4 2011, 09:28:43)
 [GCC 4.2.1 (Apple Inc. build 5664)] on darwin
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import sys
 >>> print sys.maxsize
 9223372036854775807
 >>>
 tcmac$ arch -i386 /opt/local/bin/python2.7
 Python 2.7.1 (r271:86832, Mar  1 2011, 09:22:53)
 [GCC 4.2.1 (Apple Inc. build 5664)] on darwin
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import sys
 >>> print sys.maxsize
 2147483647
 >>>
 }}}

--

Comment:

 Please remember to preview and use WikiFormatting, fill in the Port field,
 and cc the maintainer.

 This isn't a problem specific to the port; the official binaries behave
 the same. So I doubt it's going to be fixed. Run python like this: `arch
 -i386
 /opt/local/Library/Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/MacOS/Python`

-- 
Ticket URL: <https://trac.macports.org/ticket/28703#comment:1>
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