[Buildroot] glib 2.40 on xtensa

[Max Filippov]

Hi Thomas,

On Sat, Jul 19, 2014 at 1:33 PM, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> Dear Max Filippov,
>
> On Sat, 19 Jul 2014 04:28:11 +0400, Max Filippov wrote:
>> On Sat, Jul 19, 2014 at 2:40 AM, Thomas Petazzoni
>> <thomas.petazzoni at free-electrons.com> wrote:
>> > Baruch, Max,
>> >
>> > We have recently update glib to version 2.40, and this is causing
>> > issues on Xtensa:
>> >
>> >   http://autobuild.buildroot.org/results/a1a/a1a1f97a2c54ba4f7f7e44cc094a55bd23ca0aa0/build-end.log
>> >
>> >   CC       gspawn.lo
>> > gthread-posix.c: In function 'g_cond_impl_new':
>> > gthread-posix.c:648:2: error: #error Cannot support GCond on your platform.
>> >  #error Cannot support GCond on your platform.
>> >   ^
>> > gthread-posix.c: In function 'g_cond_wait_until':
>> > gthread-posix.c:896:2: error: #error Cannot support GCond on your platform.
>> >  #error Cannot support GCond on your platform.
>> >   ^
>> > gthread-posix.c:859:19: warning: unused variable 'ts' [-Wunused-variable]
>> >    struct timespec ts;
>> >                    ^
>> >
>> > Could you have a look and see what can be done to fix this problem?
>>
>> It requires pthread_cond_timedwait_relative_np (not available on uclibc)
>
> Well, libglib builds fine on ARM/uClibc.
>
>> or pthread_condattr_setclock (only available with NPTL). Looks like we
>> need NPTL to support this glib version.
>
> Argh. There's no NPTL support for:
>
>  - ARC (but I believe it's coming)
>  - AVR32 (but we're deprecating this architecture, so we don't care)
>  - Blackfin (and I don't think there's much hope to have NPTL one day,
>    but glib is anyway disabled on !MMU platforms, so we don't care)
>  - Xtensa (don't know)
>  - i386 (because NPTL requires at least i486)
>
> Should we patch glib to make the support of the GCond stuff optional,
> and hope not too many programs will use it? Or simply add the NPTL
> dependency to glib, but that would mean a huge number of packages
> suddenly become unavailable for some architectures.

There's a patch in glib mainline that implements GMutex natively on linux.
It applies cleanly to glib-2.40 and with it xtensa builds successfully.
I can post a buildroot patch with it.

-- 
Thanks.
-- Max