From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?J=F6rg?= Krause <joerg.krause@embedded.rocks>
Date: Sun, 22 Jan 2017 11:19:45 +0100
Subject: [Buildroot] [PATCH] package/mpd: disable on SPARCV8, NIOS2,
 ARMV{4, 5}
In-Reply-To: <20170122172600.333588cf@free-electrons.com>
References: <20170121161100.3142-1-joerg.krause@embedded.rocks>
 <20170122172600.333588cf@free-electrons.com>
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List-Id: <buildroot.busybox.net>
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To: buildroot@busybox.net

Hi Thomas,

On Sun, 2017-01-22 at 17:26 +1100, Thomas Petazzoni wrote:
> Hello,
> 
> On Sat, 21 Jan 2017 17:11:00 +0100, J?rg Krause wrote:
> > Since version 0.20 mpd uses the C++11 feature `std::exception_ptr`
> > which
> > is not available on architectures that do not have always-lock-free
> > atomics for int.
> > 
> > The issue [1,2] has been fixed in GCC trunk r244051 [3] and will be
> > available in GCC 7. However, as GCC 7 is not released yet and will
> > not
> > be before the next release of Buildroot, we disable the following
> > architectures, which caused build errors on the autobuilders:
> > ? * SPARCV8
> > ? * NIOS2
> > ? * ARMV4
> > ? * ARMV5
> > 
> > Fixes:
> > http://autobuild.buildroot.net/results/1c5/1c5090fe361b08c60277e54b
> > e1bfa7e80d5d31d8/
> > http://autobuild.buildroot.net/results/076/07621b958a3a350667905435
> > 86549aa41f2effa9/
> > http://autobuild.buildroot.net/results/7b1/7b12d41bee83ad20251dbc70
> > 26e0fc665d5abe0c/
> > .. and many more
> 
> How many packages are potentially affected by this?

Not sure about this. Eventually all C++11 packages using
std:exception_ptr or std::future are affected. I am not aware of any
other Buildroot package besides MPD.

> The reason I'm asking is because I believe a
> BR2_TOOLCHAIN_HAS_GCC_BUG_xyz hidden option would be a bit better:
> 
> ?1. It would document what this is for
> 
> ?2. It would avoid repeating the architecture conditions

Yes, this would be better in case more packages show up. Shall I make
an updated fix?

J?rg