[Buildroot] [PATCH] rabbitmq-c: needs a toolchain with posix_spawn support

[Yann E. MORIN <yann.morin.1998@free.fr>]

Joris, thomas, All,

On 2016-01-12 21:39 +0100, Thomas Petazzoni spake thusly:
> On Mon, 11 Jan 2016 13:52:33 +0100, Joris Lijssens wrote:
> > Fixes:
> > http://autobuild.buildroot.net/results/a6c3e79c61c5a535970d03bf37b068349f766a7f/
> > Signed-off-by: Joris Lijssens <joris.lijssens@gmail.com>
[--SNIP--]
> > diff --git a/package/rabbitmq-c/Config.in b/package/rabbitmq-c/Config.in
> > index b330c90..ec72f82 100644
> > --- a/package/rabbitmq-c/Config.in
> > +++ b/package/rabbitmq-c/Config.in
> > @@ -1,11 +1,15 @@
> >  config BR2_PACKAGE_RABBITMQ_C
> >  	bool "rabbitmq-c"
> >  	depends on BR2_TOOLCHAIN_HAS_THREADS
> > +	depends on (BR2_UCLIBC_VERSION_SNAPSHOT || BR2_UCLIBC_VERSION_NG \
> > +		|| BR2_TOOLCHAIN_USES_GLIBC) # spawn.h
> >  	help
> >  	  This is a C-language AMQP client library for use with v2.0+
> >  	  of the RabbitMQ broker.
> >  
> >  	  https://github.com/alanxz/rabbitmq-c
> >  
> > -comment "rabbitmq-c needs a toolchain w/ threads"
> > -	depends on !BR2_TOOLCHAIN_HAS_THREADS
> > +comment "rabbitmq-c needs a uclibc snapshot, uclibc-ng or (e)glibc toolchain w/ threads"
> > +	depends on !BR2_TOOLCHAIN_HAS_THREADS \
> > +		|| !(BR2_UCLIBC_VERSION_SNAPSHOT || BR2_UCLIBC_VERSION_NG \
> > +		|| BR2_TOOLCHAIN_USES_GLIBC) 
> 
> I know that the vlc package is doing the same for its spawn.h
> dependency, but I don't like this: the comment says that you need a
> "uclibc snapshot or uclibc-ng toolchain", but in practice, if you use
> an external toolchain that uses uClibc-ng, you still won't be able to
> enable the rabbitmq-c package because BR2_UCLIBC_VERSION_NG is a symbol
> that is specific to the internal toolchain backend.
> 
> So I see a few options here:
> 
>  1/ We do like the blktrace package is doing (for the same reason),
>     which is allowing the package only on glibc and musl
>     configurations. This is a bit sad because modern uClibc version are
>     perfectly capable of handling this package.
> 
>  2/ We assume that all uClibc versions are now sufficiently recent and
>     we allow the package with uClibc, with a special exception for the
>     Blackfin toolchain (which was the reason of the failure).
> 
> (If we chose either (1) or (2), then we should align vlc and blktrace
> on the chosen solution)
> 
> Peter, Yann, what do you think ?

Well:
  - I don't care much about bfin, 

  - last uClibc verison was ~3 years ago, uClibc snapshot is OK,
    uClibc-ng is capable.

So we can consider that ancient uClibc missing spawn.h is too old, and
we don't support that.

So I'm fine with #2. And of course, we must propagate that decision ot
other similarly-impacted packages, yes.

Regards,
Yann E. MORIN.

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