Hi Alexandr,
Thank you for your suggestion. That seems to have solved my problem!
Now, I would just like to understand the subtleness of the situation.
The entire example (taken from Mathlab examples directory) I am working with is:
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "engine.h"
int main()
{
Engine *ep;
if (!(ep = engOpen("\0")))
{
fprintf(stderr, "\nCan't start MATLAB engine\n");
return EXIT_FAILURE;
}
else
{
// main loop
while (true)
{
// do stuff
...
}
engClose(ep);
}
}
I am compiling this with the following command (running this command in linux
62 or linux 32 produces an identical binary):
gcc -m32 myexaple.c -o myexample -I/mathlab/include/dir -L/usr/lib
-L/mathlab/lib/dir -leng -lmx
When I run myexample in a 32b booted linux it works fine and the mathlab engine
is "opened" normally.
When I run the same in a 64b booted linux the engine does not open and I get
the EXIT_FAILURE condition.
Finally, if I run 'linux32 myexample' under a 64b booted linux it also works
fine! So it seems, for some applications, just running
a 32b executible under 64b environment is not enough, or am I wrong it trying
to run *any* 32b executible *without* prefixing it
with "linux32" ?
Any insight would be greatly appreciated!
Vahe Avedissian
--- Original Message ----
From: Alexandr Malusek <[EMAIL PROTECTED]>
To: [email protected]
Sent: Friday, August 31, 2007 11:10:01 AM
Subject: Re: [opensuse] 32b compiled program not running in 64x environment -
open SuSE 10.2
On Thursday 30 August 2007 00:31, Vahe Avedissian wrote:
...
> I have open SuSE 10.2 32 and 64 bit installed on the same machine.
>
> I compile a small matlab example under 32b (either by booting 32b linux or
> -m32 compiler flag) and run under 32 and 64 bit linux. The code compiles
> under both environments.
>
> However, the code runs normally under 32b linux, but the 64b linux runtime
> causes an error condition and the sample code exits.
As a workaround, you can install and run the 32-bit version of Matlab under
64-bit openSUSE. On our servers, we put the 32-bit version
into /lw/matlab/7.4 and the 64-bit one into /lw64/matlab/7.4. The command
that simulates the 32-bit environment under 64-bit linux is "linux32":
$ /lw64/matlab/7.4/bin/matlab # start 64-bit matlab
$ linux32 /lw/matlab/7.4/bin/matlab # start 32-bit matlab
To install the 32-bit version of Matlab, run "linux32 install".
If I remember it right, several Matlab toolboxes were available for the 32-bit
version only some time ago. In other words, they were 32-bit and didn't run
under the 64-bit Matlab---just as your code. Mathworks may tell you more.
--
A.M.
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