[maemo-developers] Qemu Error on Maemo

[From: Eero Tamminen]

Hi,

ext Deepak Kr. Sharma, Noida wrote:
> Thanks for your prompt reply.
> 
> It doesn't crash on x86. In the early stages of development it used to
> work for ARMEL, but now it doesn't.
 >
> So once the application has been tested for x86, the app should be built
> for ARMEL and tested on the device?

Correct.

Another difference between Scratchbox and device is that Scratchbox
environment provides the normal GNU tools (they are required for
building most Debian packages), but the device base system uses
Busybox[1] instead which has some incompatibilities with the GNU tools
(missing binaries and command line options).  This can be significant
if your software uses shell scripts, but keeping to POSIX standard
utilities/syntax/command line options should be (fairly) safe.


There are some coding issues that could be ARM specific, but they are
pretty rare.  Alignments are a bit different on ARM than in x86 etc,
but these you should usually be able to catch with gcc warning options,
at least you should use "-Wall", preferably also "-Wextra".  Timings
are also different which could trigger bugs in your code, especially
if you're using threads.

When testing the code on x86, I would recommend using Valgrind[2]
to check for memory access errors and leaks in your code.


	- Eero

[1] http://busybox.net/

[2] http://maemo.org/development/tools/doc/diablo/valgrind/