On Fri, 4 Nov 2016, Dan Horák wrote:

> On Fri, 4 Nov 2016 13:06:05 +0000
> Joseph Myers <joseph@codesourcery.com> wrote:
> 
> > On Fri, 4 Nov 2016, Adhemerval Zanella wrote:
> > 
> > > I faced the same issue and the solution I found was to configure
> > > gcc with '--disable-shared'.  It is not an optimal approach for a
> > > complete toolchain, but it is at least suffice to correctly build
> > > glibc.
> > 
> > The first GCC (whose build fails) *is* configured with
> > --disable-shared (and --without-headers --with-newlib to get
> > inhibit_libc defined).  It still tries to build unwind code that
> > includes libc headers unconditionally.
> 
> we used to have the following patch in the Fedora cross-gcc
> http://pkgs.fedoraproject.org/cgit/rpms/cross-gcc.git/log/cross-gcc-with-libgcc.patch

Thanks.  I see that stdlib.h include was removed by

r231697 | edlinger | 2015-12-16 15:24:52 +0000 (Wed, 16 Dec 2015) | 5 lines

2015-12-16  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * unwind-generic.h (_Unwind_GetTextRelBase): Call __builtin_abort
        instead of abort to avoid dependency on stdlib.h.

so I'll see if the problem goes away with newer GCC (I'm initially trying 
to clean up results with GCC 5 branch before going on to GCC 6 and 
mainline).

-- 
Joseph S. Myers
joseph@codesourcery.com