From: Joel VanderWerf <vjoel@...>
Date: 2009-02-10T03:34:08+09:00
Subject: Re: A Tk window

Hidetoshi NAGAI wrote:
> From: Joel VanderWerf <vjoel@path.berkeley.edu>
> Subject: Re: A Tk window
> Date: Mon, 9 Feb 2009 05:43:28 +0900
> Message-ID: <498F4419.5080507@path.berkeley.edu>
>> I haven't gotten ruby/tk to work with 8.5. It's been ok with 8.4 but 
>> segfaults with 8.5.
>>
>> This is on ubuntu. I build tcl8.5.6 and tk8.5.6 with
>>
>> ./configure --disable-threads --prefix=/usr/local
>> make && make install
>>
>> The tk demos run correctly.
>>
>> Then I build ruby (1.8.6-p287) with:
>>
>> ./configure --disable-pthread --with-tcl-dir=/usr/local 
>> --with-tk-dir=/usr/local --disable-tcl-thread
>> make && make install
>>
>> (I tried just rebuilding ext/tk as described in README.tcltklib, but the 
>> effect was the same.)
>>
>> Then *some* of the ruby/tk demos run but some segfault. For example:
> 
> Probably, your Tcl/Tk libraries are compiled with threads support option. 
> The following table is the relation of thread support between 
> Ruby and Tcl/Tk. 
> 
>                    |  Tcl/Tk with threads  |   without threads 
> -------------------+-----------------------+------------------------
>  Ruby with pthread |         work          |    possibly work
> -------------------+-----------------------+------------------------
>   without pthread  | NOT work (freq. SEGV) |         work
> -------------------+-----------------------+------------------------
> 
> "--disable-tcl-thread" option doesn't change thread support status of 
> Tcl/Tk libraries.

You're right about my tk lib using pthread, but I'm not sure why:

$ ldd libtk8.5.so | grep thread
         libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7b2d000)

But I did rebuild tcl and tk with the options shown above, including 
--disable-threads. The strange thing is that this worked for me in the 
past with 8.4. Is there some other option that I have to pass to 
configure to disable pthread?

Interestingly,

$ ldd libtcl8.5.so | grep thread

has empty output. So somehow tk is building with pthread, but tcl is 
not. I used the same configure arguments for both.

I just rebuilt tk8.5.6 again with

./configure --disable-threads --prefix=/usr/local

and the still the resulting libtk8.5.so depends on libpthread.

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407