Re: CFT: Move unwinder to toplevel libgcc

[Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>]

Steve,

> Well, I see "-Wl,--version-script=libgcc.map" on the link line now but I
> still get an error during the link:
>
> /wsp/sje/gcc_git/gcc-ia64-debian-linux-gnu-gcc/ia64-debian-linux-gnu/bin/ld: ./libgcc_s.so.1.tmp: version node not found for symbol _Unwind_GetBSP@GCC_3.3.2
> /wsp/sje/gcc_git/gcc-ia64-debian-linux-gnu-gcc/ia64-debian-linux-gnu/bin/ld: failed to set dynamic section sizes: Bad value
> collect2: error: ld returned 1 exit status
> make[3]: *** [libgcc_s.so] Error 1
> make[3]: Leaving directory `/wsp/sje/gcc_git/build-ia64-debian-linux-gnu-gcc/obj_gcc/ia64-debian-linux-gnu/libgcc'
> make[2]: *** [all-stage1-target-libgcc] Error 2
> make[2]: Leaving directory `/wsp/sje/gcc_git/build-ia64-debian-linux-gnu-gcc/obj_gcc'
> make[1]: *** [stage1-bubble] Error 2
> make[1]: Leaving directory `/wsp/sje/gcc_git/build-ia64-debian-linux-gnu-gcc/obj_gcc'
> make: *** [bootstrap] Error 2
>
> I think the contents of the map file may be wrong.  This error involves a different symbol then when the
> mapfile was missing.

I'm convinced now that this is the wrong approach.  All we need for
libunwind is a couple of common definitions that happen to only live in
t-slibgcc at the moment.  But including t-slibgcc and dependencies opens
a can of worms, so it's far easier to just provide the definitions
t-libunwind-elf needs ourselves.  So could you

* remove all the t-slibgcc* and related files (t-linux) from tmake_file
  in libgcc/config.host and

* add the following at the top of libgcc/config/t-libunwind-elf:

SHLIB_SOLINK = @shlib_base_name@.so
SHLIB_OBJS = @shlib_objs@
SHLIB_DIR = @multilib_dir@
SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@

As you can see, these four variables (the only SHLIB_* ones
t-libunwind-elf uses) are substituted by libgcc/Makefile.in and are
completely generic.

I'll be working on the SHLIB_* move to toplevel libgcc next, so if all
else fails, we could handle all that SHLIB stuff there.

Thanks.
        Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University