Re: eCos GNU tools 4.6.3-20120315 [Was Re: eCos GNU tools 4.6.2-20120125 ready for testing]

["Lambrecht Jürgen" <J.Lambrecht@TELEVIC.com>]

On 03/18/2012 08:09 PM, Ilija Kocho wrote:
>
> Hi Alex
>
> Thank you for testing 4.6.2-20120125.
>
> 4.6.3-20120315 is our new test release until we upgrade GDB with Jifl's
> patch:
> http://ecos.sourceware.org/ml/ecos-discuss/2012-03/msg00064.html
>
> Ilija
>
>
Hi all,

I finished building our "Passenger Information System" application with 
gcc 4.6.3 (started with 4.6.2, noticed no difference when switching to 
4.6.3).
Before, we used gcc 3.2.1.

I first built ecos v3.0 without any problem.
Then I built our application, and it took me many days to solve all new 
warnings (we compile with -Werror):
- unused-but-set-variable -> gave me problems with MISRA rule /16.10/ 
(If a function returns error information, then that error information 
shall be tested.) Our PC-lint checker forces any return argument to be 
used, so I had to add __attribute__ ((unused)).
Also, this warning is annoying for HW drivers: then you sometimes need 
to read some bit just to trigger some behavior, but you are not 
interested in the return value..
- pointer-sign
- packed attribute (chars are byte aligned by default, so they are 
"naturally packed 
<http://www.mail-archive.com/lwip-users@nongnu.org/msg02757.html>". So 
don't try to pack chars)
- '#ifdef ... #elif' cannot be mixed any more ('#ifdef ... #elif 
defined' instead)
Finally I gave up (for this test) using -Werror because some customer 
code we use is too badly written (I will wait for their update).

But aside from those warnings, it builds fine, and also runs fine on our 
AT91 ARM9 processor.
No issues so far. Do you  know something to watch out for?

Next step is to build the same code version with the old compiler, and 
see with the eCos CPU monitor if there is any difference.

Kind regards,
Jürgen

-- 
Jürgen Lambrecht
R&D Associate
Tel: +32 (0)51 303045    Fax: +32 (0)51 310670
http://www.televic-rail.com
Televic Rail NV - Leo Bekaertlaan 1 - 8870 Izegem - Belgium
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