running 32 bit apps on amd64 version of Ubuntu

Paul Johnson pauljohn32 at
Thu Nov 6 23:12:37 UTC 2008

On Thu, Nov 6, 2008 at 5:08 PM, John Hubbard <ender8282 at> 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.


> --
> -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.
> --
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> ubuntu-users at
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Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas

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