[Buildroot] Python: can't resolve symbol

[bruce bushby]

Quick update:

I re-installed Python on my "buildhost"...and then I did a "rpm -e --nodeps"
of the readline and readline-devel rpms, then in build root I did a "make
clean ; make"

That confirmed that buildroot is not "compile python readline" with the
hosts readline includes etc"...but I still get symbol errors.

So digging about a bit further I looked at the readline library on the
embedded OS:
[root at vx-200 ~]# ldd /usr/lib/libreadline.so.6.1
checking sub-depends for '/lib/libc.so.0'
        ld-uClibc.so.0 => /lib//ld-uClibc.so.0 (0x400cc000)
        libc.so.0 => /lib/libc.so.0 (0x00000000)
        /lib//ld-uClibc.so.0 => /lib//ld-uClibc.so.0 (0x00000000)
[root at vx-200 ~]#

I see it it uses both uclibc and libc.  That last line looks looks a bit
dodgy?

So I think I need to look into the readline package/compile....suspect it is
the reason for the symbol errors. Also, I can't "import readline" so the
symbol errors are more
then just informative.

Bruce



Session log starting a python interactive shell and importing readline:

[root at vx-200 ~]# python
Python 2.7.1 (r271:86832, Mar 21 2011, 18:11:40)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

python: symbol 'BC': can't resolve symbol

python: symbol 'PC': can't resolve symbol

python: symbol 'UP': can't resolve symbol

python: symbol 'tgetnum': can't resolve symbol

python: symbol 'tgoto': can't resolve symbol

python: symbol 'tgetflag': can't resolve symbol

python: symbol 'tputs': can't resolve symbol

python: symbol 'tgetent': can't resolve symbol

python: symbol 'tgetstr': can't resolve symbol
>>>
>>> import readline

python: symbol 'BC': can't resolve symbol

python: symbol 'PC': can't resolve symbol

python: symbol 'UP': can't resolve symbol

python: symbol 'tgetnum': can't resolve symbol

python: symbol 'tgoto': can't resolve symbol

python: symbol 'tgetflag': can't resolve symbol

python: symbol 'tputs': can't resolve symbol

python: symbol 'tgetent': can't resolve symbol

python: symbol 'tgetstr': can't resolve symbol
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: unknown dlopen() error
>>>






On Mon, Mar 21, 2011 at 4:32 PM, bruce bushby <bruce.bushby at gmail.com>wrote:

>
> Hi
>
> I've been having a problem compiling python "readline" module. If I include
> the readline python module in my config, I get symbol errors when I start a
> python interactive shell.
>
> As a test, I stripped all python and readline from my build "host"
> machine....but buildroot complains that it's can't find python. I'm guessing
> this is due to the "host-python" directive?
>
> Since my build machine is 32bit Intel and my embedded board/target is
> ARM.....why would I need a local install of python to download and compile
> python for ARM?
>
> I'm suspecting that python is compiling against my "host's" readline
> library and not the readline that should have been compiled for my ARM
> target...which I think is what is causing the symbol errors.
>
> So far I've tried the "latest stable" release and the "daily snapshot" on:
> Fedora 12 (64bit)
> Fedora 14 (32bit)  <-- my current build host
> Ubuntu Natty
>
>
> Bruce
>
>
>
>
>
>
>
> On Tue, Mar 8, 2011 at 8:20 AM, bruce bushby <bruce.bushby at gmail.com>wrote:
>
>> Hi
>>
>> I'm not sure if this is the right list to post this issue to?
>>
>> From what I can tell, these "can't resolve" messages are caused when
>> selecting "readline"
>>
>>
>> # python
>> Python 2.7.1 (r271:86832, Mar  7 2011, 22:37:34)
>> [GCC 4.5.2] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>
>> python: symbol 'BC': can't resolve symbol
>>
>> python: symbol 'PC': can't resolve symbol
>>
>> python: symbol 'UP': can't resolve symbol
>>
>> python: symbol 'tgetnum': can't resolve symbol
>>
>> python: symbol 'tgoto': can't resolve symbol
>>
>> python: symbol 'tgetflag': can't resolve symbol
>>
>> python: symbol 'tputs': can't resolve symbol
>>
>> python: symbol 'tgetent': can't resolve symbol
>>
>> python: symbol 'tgetstr': can't resolve symbol
>> >>>
>>
>
>
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