From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yann E. MORIN <yann.morin.1998@free.fr>
Date: Wed, 28 Sep 2016 18:47:21 +0200
Subject: [Buildroot] pppd breaks build without libutils
In-Reply-To: <20160928164102.GG1947@waldemar-brodkorb.de>
References: <CAOoxthNVzy2PCz1tsACpxdhaoVO=RZgQR-A1dMB2u0HA3yXPqA@mail.gmail.com>
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 <5cce18a6-b051-a6bf-17e0-e9fa82a1491e@mind.be>
 <20160927214325.GC8646@free.fr>
 <20160928105900.55310907@free-electrons.com>
 <20160928163439.GA3622@free.fr>
 <20160928164102.GG1947@waldemar-brodkorb.de>
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To: buildroot@busybox.net

Waldemar, All,

On 2016-09-28 18:41 +0200, Waldemar Brodkorb spake thusly:
> Yann E. MORIN wrote,
> > On 2016-09-28 10:59 +0200, Thomas Petazzoni spake thusly:
> > > On Tue, 27 Sep 2016 23:43:25 +0200, Yann E. MORIN wrote:
> > > 
> > > > Which suddenly rings a bell here: the latest uClibc-ng version, 1.0.18,
> > > > now is one-lib, i.e. everything merged into libc.so like musl is, so
> > > > we could get external toolchains which will lack libutil.so because
> > > > there is no longer such a library now.
> > > > 
> > > > If uClibc-ng does like musl does, there will be a lot of empty static
> > > > versions of the libraries, libutil.a, libcrypt.a and so on, but there
> > > > will no longer be shared variants.
> > > > 
> > > > We'll have to account for that in our external toolchain handling.
> > > 
> > > I'm not sure what needs to be handled. We already support musl that
> > > does this, and it works fine. It should be perfectly transparent to the
> > > external toolchain handling (except the copying of the shared libraries
> > > to the target, of course).
> > 
> > That's exactly what I meant: currently, we copy anexplicit set of shared
> > libraries from external uClibc-based toolchains:
> > 
> >    66 ifeq ($(BR2_TOOLCHAIN_EXTERNAL_GLIBC)$(BR2_TOOLCHAIN_EXTERNAL_UCLIBC),y)
> >    67 TOOLCHAIN_EXTERNAL_LIBS += libatomic.so.* libc.so.* libcrypt.so.*
> >         libdl.so.* libgcc_s.so.* libm.so.*       libnsl.so.* libresolv.so.*
> >         librt.so.* libutil.so.*
> >    68 ifeq ($(BR2_TOOLCHAIN_EXTERNAL_GLIBC)$(BR2_ARM_EABIHF),yy)
> >    69 TOOLCHAIN_EXTERNAL_LIBS += ld-linux-armhf.so.*
> >    70 else
> >    71 TOOLCHAIN_EXTERNAL_LIBS += ld*.so.*
> >    72 endif
> >    73 ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
> >    74 TOOLCHAIN_EXTERNAL_LIBS += libpthread.so.*
> >    75 ifneq ($(BR2_PACKAGE_GDB)$(BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY),)
> >    76 TOOLCHAIN_EXTERNAL_LIBS += libthread_db.so.*
> >    77 endif # gdbserver
> >    78 endif # ! no threads
> >    79 endif
> > 
> > Now, old uClibc-based toolchains will have those libs, while newer ones
> > will only have libc.so.* .
> 
> Just to be sure:
> It will have libc.so.* and ld-uClibc* they are not combined.
> And for gdb threading we still have libthread_db.so*.

Yes, I've seen that, but the main point is that most of the shared
variants will no longer be available any more, so we need to only copy
them when they exist.

Regards,
Yann E. MORIN.

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