Re: [PATCH 02/12] s390: don't build vdso32 with clang

Arnd Bergmann
2019-04-10T19:00:52Z

On Wed, Apr 10, 2019 at 6:26 PM 'Nick Desaulniers' via Clang Built
Linux <clang-built-linux@googlegroups.com> wrote:
>
> On Mon, Apr 8, 2019 at 2:27 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >
> > clang does not support 31 bit object files on s390, so skip
> > the 32-bit vdso here, and only build it when using gcc to compile
> > the kernel.
>
> What's the build failure? Would you mind filing a bug against LLVM's
> issue tracker for it, please?

As far as I can tell, llvm does only supports 64-bit output for s390, so this
is not a bug but rather a missing feature that seems highly unlikely to
ever get added.

32-bit (31-bit) mode on s390 is only used for very old existing binaries,
and the vdso support is optional there.

Arnd