[Xenomai-core] Strange results with ARM EABI, gcc 4.3.2

[Xenomai-core] Strange results with ARM EABI, gcc 4.3.2

[Richard Cochran]

A certain xenomai project on ARM Linux of mine has been working fine
using gcc 3.4.5. I wanted to use a more recent compiler and the EABI,
so I used a default setting from crosstool-NG-1.4.1, which produces
gcc version 4.3.2.

However, I get the following result running the trivial-periodic
example program:

# ./trivial-periodic &
# cat /proc/xenomai/sched 
CPU  PID    PRI      PERIOD     TIMEOUT    TIMEBASE  STAT       NAME
  0  0       -1      0          0          master    R          ROOT
  0  850     99      1000000000 79513195085358725 master    D          trivial

Looks like I will be waiting a long, long time for the timeout ;^)
Any ideas?

Thanks,
Richard

Re: [Xenomai-core] Strange results with ARM EABI, gcc 4.3.2

[Gilles Chanteperdrix]

Richard Cochran wrote:
> A certain xenomai project on ARM Linux of mine has been working fine
> using gcc 3.4.5. I wanted to use a more recent compiler and the EABI,
> so I used a default setting from crosstool-NG-1.4.1, which produces
> gcc version 4.3.2.
> 
> However, I get the following result running the trivial-periodic
> example program:
> 
> # ./trivial-periodic &
> # cat /proc/xenomai/sched 
> CPU  PID    PRI      PERIOD     TIMEOUT    TIMEBASE  STAT       NAME
>   0  0       -1      0          0          master    R          ROOT
>   0  850     99      1000000000 79513195085358725 master    D          trivial
> 
> Looks like I will be waiting a long, long time for the timeout ;^)
> Any ideas?

gcc 4.3 has a bug with Xenomai on arm. You should stay with gcc 4.2
(which also has a bug, but we know how to workaround it).

I think I will add a dynamic detection of this bug, print an error
message when it happens and exit.

-- 
					    Gilles.