[Buildroot] strace on xtensa/uclibc

Thomas Petazzoni thomas.petazzoni at bootlin.com
Tue Dec 11 12:50:24 UTC 2018


Hello,

Waldemar, Max, any input on the below issue ?

Thanks,

Thomas

On Fri, 7 Dec 2018 09:13:56 +0100, Thomas Petazzoni wrote:
> Hello,
> 
> +Baruch, Max Filipov for Xtensa and Waldemar for uClibc-ng.
> 
> On Fri,  7 Dec 2018 08:00:29 +0100 (CET), Thomas Petazzoni wrote:
> 
> >       xtensa |                    strace-4.25 | NOK | http://autobuild.buildroot.net/results/5a0112b7a2c81fa5253c9adc93efe415256cd811 |       
> 
> I had a look at those failures of strace on xtensa:
> 
>   http://autobuild.buildroot.net/?reason=strace-4.25
> 
> I.e, strace 4.25 only fails to build on Xtensa. The reason is that
> uClibc-ng doesn't have the correct values for some POLL* macros: they
> don't match the kernel values.
> 
> Let's take POLLWRBAND as an example. The kernel defines it like this:
> 
> arch/xtensa/include/uapi/asm/poll.h:#define POLLWRBAND  0x0100
> 
> So strace 4.25 checks that it has the correct value:
> 
> #if defined(__m68k__) || defined(__mips__) || defined(__sparc__) || defined(__xtensa__)
> #if defined(POLLWRBAND) || (defined(HAVE_DECL_POLLWRBAND) && HAVE_DECL_POLLWRBAND)
> DIAG_PUSH_IGNORE_TAUTOLOGICAL_COMPARE
> static_assert((POLLWRBAND) == (0x0100), "POLLWRBAND != 0x0100");
> 
> But uClibc-ng doesn't have an arch-specific header to define POLLWRBAND
> on xtensa, so it falls back to the generic definition, which isn't
> correct for xtensa:
> 
> libc/sysdeps/linux/common/bits/poll.h:# define POLLWRBAND       0x200           /* Priority data may be written.  */
> 
> The same issue happens with POLLREMOVE.
> 
> I think xtensa needs to have its own
> libc/sysdeps/linux/xtensa/bits/poll.h in uClibc-ng.
> 
> Best regards,
> 
> Thomas



-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com


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