CFT: Move unwinder to toplevel libgcc

[Rainer Orth]

Steve,

>> 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

> This died with:
>
>
> make[3]: *** No rule to make target `/wsp/sje/gcc_git/src/gcc/libgcc/config/libgcc-glibc.ver', needed by `libgcc.map'.  Stop.
> 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 I need to copy gcc/config/ia64/libgcc-glibc.ver over to libgcc/config/ia64/libgcc-glibc.ver
> and modify SHLIB_MAPFILES to $(srcdir)/config/ia64/libgcc-glibc.ver.  So t-linux might need to be
> t-ia64-linux or something like that since it would be IA64 specific now.  Or is there a better way
> to fix this?  I will try my fix (leaving the t-linux name alone for now).

I'm an idiot: I've just copied the relevant lines from
gcc/config/t-linux, forgetting that libgcc-glibc.ver still lives in
gcc/config.

ibgcc/config/t-linux should be

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

instead.

AFAICS, you will need both the generic gcc/config/libgcc-glibc.ver and
gcc/config/ia64/libgcc-glibc.ver.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University