[Buildroot] Problem running program compiled with the toolchain

[Buildroot] Problem running program compiled with the toolchain

[Marc Leclerc]

Hi,

I have built an x86 embedded system using buildroot 2010.08. I have been
trying a few lib&  compiler version trying to find the problem without
success then I added gdb to the target to see if I could get more info

First I tried my application which was developped in the past year
compiled with the buildroot toolchain and it wont start (either illegal
instruction or segfault (seems to change if I use static linking). weird
thing is that the library examples do run and I am using those same
libraries and makefile based on theirs.

I then tried a simple app

int main (int argc, char **argv)
{
     return 0;
}

and I get a segfault at 1 ip 00000001 ...
adding a printf I get Illegal instruction

running under gdb amazingly tells me that the file is not in executable
format: File format not recognized

This app starts on my host and is recognized
The demos do start as well

Oviously I am missing something here, could anyone ring my bell

Regards

[Buildroot] Problem running program compiled with the toolchain

[Marcus Osdoba]

  Am 16.09.2010 22:07, schrieb Marc Leclerc:
>
> I have built an x86 embedded system using buildroot 2010.08. I have been
> trying a few lib&  compiler version trying to find the problem without
> success then I added gdb to the target to see if I could get more info
>
> This app starts on my host and is recognized
> The demos do start as well
>
Hi Marc,
How did you install the application for your target? By a user defined 
package in parallel to all others in package/*?
It sound like you have build your application on and for your host - 
which might be a differtent architecture than that of your target (i386 
<> x64). Integrating your application like all other packages in the 
user land directory and booting the generated rootfs, should run your 
application - at least the simple example you gave ;-)

Regards,
Marcus

[Buildroot] Problem running program compiled with the toolchain

[Marc Leclerc]

  Marcus,

Turns out, after scratching my head to gray hair, that there were no 
problem in compiling for the proper target...

I used Filezilla to transfer my file and for some reason it would 
transfer the examples program correctly but not my application, likely 
using ASCII and messing things up. Setting transfer to use explicit 
binary format and then all those hours of search came to an end.

Still leaves me to wonder what use is there for ftp ASCII transfer if 
binary transfer should do it all

Thanks anyway for your time, I was waiting to see my post to add I found 
the problem. Sometime it's just too ovious... or not

Marc

On 2010-09-17 13:29, Marcus Osdoba wrote:
>  Am 16.09.2010 22:07, schrieb Marc Leclerc:
>>
>> I have built an x86 embedded system using buildroot 2010.08. I have been
>> trying a few lib&  compiler version trying to find the problem without
>> success then I added gdb to the target to see if I could get more info
>>
>> This app starts on my host and is recognized
>> The demos do start as well
>>
> Hi Marc,
> How did you install the application for your target? By a user defined 
> package in parallel to all others in package/*?
> It sound like you have build your application on and for your host - 
> which might be a differtent architecture than that of your target 
> (i386 <> x64). Integrating your application like all other packages in 
> the user land directory and booting the generated rootfs, should run 
> your application - at least the simple example you gave ;-)
>
> Regards,
> Marcus
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