[Buildroot] [autobuild.buildroot.net] Build results for 2017-03-17

[Waldemar Brodkorb]

Hi,
Arnout Vandecappelle wrote,

> 
> 
> On 18-03-17 17:33, Waldemar Brodkorb wrote:
> > Hi,
> > 
> >> Am 18.03.2017 um 17:19 schrieb Arnout Vandecappelle <arnout at mind.be>:
> >>
> >>
> >>
> >>> On 18-03-17 17:02, Waldemar Brodkorb wrote:
> >>> Hi Arnout,
> >>> Arnout Vandecappelle wrote,
> >>>
> >>>>
> >>>>
> >>>>> On 18-03-17 08:28, Thomas Petazzoni wrote:
> >>>>> microblazeel |                nfs-utils-1.3.3 | NOK | http://autobuild.buildroot.net/results/240cfb0497b1dd7b5b33b8f64635cca435d49f05
> >>>>
> >>>> I looked at this one and I'm a bit stumped. This is the error:
> >>>> .../sysroot/usr/lib/libc.a(clnt_simple.os): In function `callrpc':
> >>>> (.text+0x0): multiple definition of `callrpc'
> >>>> .../sysroot/usr/lib/libtirpc.a(libtirpc_la-rpc_soc.o):(.text+0x784): first
> >>>> defined here
> >>>> (and many more like that).
> >>>>
> >>>> It's a bit weird that this object file from the C library even gets linked in.
> >>>> The Map file says:
> >>>>
> >>>> .../sysroot/usr/lib/libc.a(rpc_thread.os)
> >>>>    .../sysroot/usr/lib/libc.a(cancel.os) (__rpc_thread_destroy)
> >>>> (skipping a few levels of indirection here).
> >>>>
> >>>> So somehow the pthread library is pulling in the RPC support from uClibc, which
> >>>> obviously conflicts with tirpc.
> >>>
> >>> But if BR2_TOOLCHAIN_EXTERNAL_INET_RPC=y is active, isn't uClibc-ng
> >>> build with RPC support? If this is the case, you end up with two RPC
> >>> implememtations. That should be handled by Buildroot.
> >>>
> >>> Do you have support for use either libtirpc or uClibc-ng internal
> >>> RPC support?
> >>
> >> rpcbind need libtirpc for RPC support, it can't use the toolchain RPC for some
> >> reason. That's why both implementations are there.
> > 
> > What does rpcbind use? ipv6 stuff?
> 
>  I have no idea, I just see that rpcbind selects libtirpc.
> 
> 
> >> Normally it shouldn't be an issue to have two implementations. Since the one
> >> from libtirpc is linked in before libc is linked in, the one from libc isn't
> >> going to be used. This works for musl AFAICS.
> > 
> > Musl does not implement RPC. Gnu Libc deprecated it for a while.
> 
>  Hm, we still seem to enable RPC in glibc in Buildroot, and all our external
> toolchains except Codescape have it enabled as well. So the world doesn't seem
> to have caught on yet to that deprecation :-)
> 
> > 
> >> The problem is that with uClibc-ng on microblaze, RPC from libc is linked in
> >> unconditionally (from pthreads, AFAICS). Check e.g. busybox, it has
> >> rpc_thread.os, rpc_commondata.os, rpc_prot.os and rpc_dtablesize.os. uClibc-ng
> >> on ARC, for example, doesn't seem to have this.
> >>
> >> So it's the __rpc_thread_destroy in cancel.os that seems to be the problem here.
> > 
> > When Rpc is activated it will be included in libc.a since 1.0.18...
> > 
> > Arc external toolchain uses the old uclibc, where the combined libc isn't made.
> 
>  D'oh, silly me...
> 
>  So then I wonder, why don't we see this nfs-utils build failure on ARM? I just
> tested, and nfs-utils actually does succeed to build on arm-static.
> 
>  Hang on, microblaze has linuxthreads instead of NPTL... That's why it behaves
> differently.
> 
>  So, either this is fixed somehow in the linuxthreads implementation of uClibc,
> or we make libtirpc depend on !linuxthreads (nothreads is OK since the RPC stuff
> is pulled in by cancel.os - and anyway libtirpc depends on threads).
> 
> > Should uclibc-ng drop rpc support?
> 
>  I don't think that that's needed.

Hmm. rpcbind latest release requires libtirpc. I am wondering if it
is worth to keep an old ipv4 only rpc implementation intree if
nobody use it?

best regards
 Waldemar