[IPython-user] Bus error

Zachary Pincus zpincus at stanford.edu
Wed Apr 12 16:24:53 CDT 2006

Michael -

Ignore this last email. Now that I see you're using the Universal  
build of MacPython, all is more clear to me. I think (though  
hopefully Bob will clarify on the MacPython list) that readline is  
statically linked with the Python that Bob distributes. So no matter  
what version of readline you build for yourself, I think that Bob's  
MacPython will still use the version it was built with. But we'll  
resolve those issues (and the gdb confusion, which I also think is  
due to the Universal MacPython) on the MacPython email list.

For now, you'll want to either (a) sit tight, or (b) build your own  
python and everything and not use Bob's build until these issues get  
resolved. (I linked directions for that below. It's easy.) Now, (b)  
is an easy option on a PPC mac, but I'm not sure about on an intel mac.

In any case, you probably should download the latest Apple developer  
tools (see below), because you'll definitely need them.


On Apr 12, 2006, at 2:05 PM, Zachary Pincus wrote:

>> Patched with the current four patches from ftp://ftp.cwru.edu/pub/
>> bash/readline-5.1-patches, and rebuilt... still get the same error.
> You are building shared libraries for readline, right? Because if you
> built a static readline, and then built python against the static
> readline, it might still be using the old bad readline. In that case,
> you may need to rebuild python.
>> When I say 'rebuilt', I did
>> make uninstall
>> make clean
>> make distclean
>> Then started over with configure.
> Just to make sure, you did *apply* the patches with the patch
> command, and patch gave no complaints?
> Here are the instructions I give to people for building readline 5.1
> correctly:
> curl -O ftp://ftp.cwru.edu/pub/bash/readline-5.1.tar.gz
> tar -xzf readline-5.1.tar.gz
> cd readline-5.1
> curl -O ftp://ftp.cwru.edu/pub/bash/readline-5.1-patches/ 
> readline51-001
> curl -O ftp://ftp.cwru.edu/pub/bash/readline-5.1-patches/ 
> readline51-002
> curl -O ftp://ftp.cwru.edu/pub/bash/readline-5.1-patches/ 
> readline51-003
> curl -O ftp://ftp.cwru.edu/pub/bash/readline-5.1-patches/ 
> readline51-004
> cat readline51* | patch
> ./configure
> make
> sudo make install
> If you did just that, and the problems persist, there are several
> options. For one, you might try using an older and better-tested
> version of readline. I think 4.2 is thought to be really solid.
> Other options are outlined below.
>> I'm not familiar with gdb, but running python under it didn't seem
>> to work:
>> ~ $ gdb python
>> GNU gdb 6.1-20040303 (Apple version gdb-434) (Wed Nov  2 17:28:16
>> GMT 2005)
>> (gdb) run
>> Starting program: /usr/local/bin/python
>> Reading symbols for shared libraries . done
>> Program received signal SIGTRAP, Trace/breakpoint trap.
>> 0x8fe0100c in __dyld__dyld_start ()
>> (gdb)
> Umm, OK. That's odd. The internet thinks it might be related to a gdb
> bug. Your best bet (and something you should do anyway) is to get the
> latest Apple dev tools download ( https://connect.apple.com/cgi-bin/
> WebObjects/MemberSite.woa/wa/getSoftware?
> fileID=20179&source=XCODE_2_2_FY06&code=XCODE_2.2_NEX ). This
> includes a newer version of gcc and gdb that have less issues.
> For now, you could also do the following before the 'run' command
> handle SIGTRAP ignore
> or
> handle SIGTRAP nostop
> and see if that helps.
> Now, did you build your own python, or is this a packaged version? If
> you built your own, you'll want to get the new dev tools, rebuild
> readline as above, and rebuild python.
> If you got a packaged version of python, it is possible that the
> package has a (bad) static version of readline linked in, causing
> problems a la the above.
> My standard MO is to build my own readline and python and everything.
> It takes a little more time, but after that things work rather well.
> Here are step-by-step instructions I wrote for some folks in my
> degree program on installing python/ipython/numpy/scipy etc. from
> source on OS X 10.4. Maybe they'll help: http://
> bmistudents.blogspot.com/2006/04/on-installation-of-proper-python.html
> Zach
>> Thanks for your help, I still suspect readline....
>> Cheers,
>> Mike
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