Re: CFT: Move unwinder to toplevel libgcc

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

Steve,

> On Tue, 2011-07-19 at 12:47 +0200, Rainer Orth wrote:
>
>> unfortunately, I don't even have an idea what this error is supposed to
>> mean.  Seems to be an error ultimately due to bfd/elfxx-ia64.c
>> (elfNN_ia64_size_dynamic_sections) failing.
>> 
>> To debug this, I'd start by comparing the link lines for a vanilla build
>> with my patch, then, if no differences are apparent, check the object
>> files.
>
> Ah, I looked at the link lines and the standard build includes this in
> the link line:
>
> 	-Wl,--version-script=libgcc.map
>
> It is missing in the build I did with your patch.

now I understand what's happening: with t-slibgcc included in
libgcc/config.host, all the SHLIB_* variables gcc/libgcc.mvars (which
stem from gcc/config.gcc including t-slibgcc-elf-ver via the *-*-linux*
case) are overridden by the most generic defaults.

I think you'll need the following:

ia64*-*-linux*)
        extra_parts="crtbegin.o crtend.o crtbeginS.o crtendS.o crtfastmath.o"
        # FIXME: Move to *-*-linux* once the SHLIB_* move is complete.
        tmake_file="t-slibgcc t-slibgcc-gld t-slibgcc-elf-ver t-linux"
        tmake_file="$tmake_file ia64/t-ia64 t-softfp ia64/t-fprules-softfp ia64/t-softfp-compat ia64/t-glibc ia64/t-eh-ia64 t-libunwind"
        if test x$with_system_libunwind != xyes ; then
                tmake_file="${tmake_file} t-libunwind-elf ia64/t-glibc-libunwind"
        fi
        md_unwind_header=ia64/linux-unwind.h
        ;;

and a new libgcc/config/t-linux:

# Override t-slibgcc-elf-ver to export some libgcc symbols with
# the symbol versions that glibc used.
SHLIB_MAPFILES += $(srcdir)/config/libgcc-glibc.ver

The t-slibgcc* fragments have been introduced to avoid the massive
duplication previously found there, but are equivalent to the current
gcc/config/t-slibgcc-elf-ver.

Perhaps you could give this a try?

Thanks.
        Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University