After discussion with the gcc folks, it seems that there is an easier
and much simpler solution, which I'm attaching.

J'

On Fri, Sep 07, 2018 at 03:50:00PM -0600, Tom Tromey wrote:
     >>>>> "John" == John Darrington <john@darrington.wattle.id.au> writes:
     
     John> 	* include/dwarf2.h (enum dwarf_unit_type) [DE_EH_PE_udata3]: New member.
     John> ---
     John>  include/dwarf2.h | 1 +
     John>  1 file changed, 1 insertion(+)
     
     I'm afraid I didn't look at the earlier discussion of this.
     
     dwarf2.h is canonically maintained in the gcc repository.  So, any
     change here has to be sent to gcc-patches and be committed there first.
     Then the patch can be applied to gdb -- this counts as obvious (IMO).
     
     Tom

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