running 32 bit apps on amd64 version of Ubuntu

[John Hubbard]

Paul Johnson wrote:
> On Thu, Nov 6, 2008 at 5:08 PM, John Hubbard <ender8282 at yahoo.com> wrote:
>   
>> Paul Johnson wrote:
>>     
>>> I came from Fedora land about 6 months ago, please pardon me for my innocence.
>>>
>>> In this Ubuntu 8.04 system, I have the amd64 version installed.  Some
>>> programs are not compatible with 64 bit, and so I need to compile the
>>> 32 bit version of the program I need. The program is written in C++
>>> and it relies on the wx GTK toolkit.
>>>
>>>       
>> OK I don't get it. If you have the source code, and are going to compile
>> it to run on your amd64 computer, why would you compile a 32 bit
>> version? It seems like you can compile it for your 64 bit processor,
>> with the installed 64 bit libraries and everything should be good.
>>
>> Am I missing something?
>>
>>     
>
> Yes.  If I compile without taking special precautions, it tries to
> compile in 64 bit mode and the program fails because it is not 64 bit
> safe.  I need to compile with the gcc options that force it to make a
> 32 bit executable, and doing so requires access to the 32 bit
> libraries on which I rely.
>   
OK now everything makes sense. I googled installing 32 bit libraries on 
64 bit Ubuntu and one of the hits had a link to an Ubuntu forum post[1]. 
I get an error message that the forum is being updated but you might 
check that if no one else gets back to you. I checked my server (64bit 
machine) and I do have a bunch of libraries in /usr/lib32/. I assume 
that you have made sure that you don't already have the library that you 
need. As far as how to compile in 32 bit mode I can't help you. 
Hopefully someone else can or you can find it with google.


[1] http://ubuntuforums.org/showthread.php?t=474790

-- 
-john

To be or not to be, that is the question
                2b || !2b
(0b10)*(0b1100010) || !(0b10)*(0b1100010)
        0b11000100 || !0b11000100
        0b11000100 || 0b00111011
               0b11111111
        255, that is the answer.