[Linux-Xtensa] Re: sched_clock always 0 and no process time accounting with 3.11-rc1

Baruch Siach baruch at tkos.co.il
Wed Jul 17 00:14:06 PDT 2013


Hi Chris,

On Wed, Jul 17, 2013 at 12:02:10AM -0700, Chris Zankel wrote:
> On 07/16/2013 11:47 PM, Baruch Siach wrote:
> >> According to C99 the behaviour of (1 << 32) is undefined on platforms with
> >> 32 bit int, so it could yield any value.
> > But so is ARM, isn't it?
> 
> The handling of constants might be target-architecture dependent.
> 
> On a somewhat related issue, are you using a 32-bit host or 64-bit host?
> Note that 64-bit cross compilation is known to be broken for Xtensa, I
> had a problem running glibc when compiled with cross compiler on a
> 64-bit host.

Yes, my host is x86_64. I haven't encountered any problem yet. But thanks for 
the warning, I'll keep that in mind. I think it's worth a mention in the 
linux-xtensa wiki. It surly worth a fix as well, I guess. Are there any 
samples of code that are known to be break with 64 bit host?

baruch

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