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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/26987] GCC 11 Ada binaries contain unknown tags
Date: Wed, 02 Dec 2020 14:19:19 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26987

Tom Tromey <tromey at sourceware dot org> changed:

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--- Comment #10 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Mark Wielaard from comment #9)

> So this is encoded as DW_FORM_block1, which is not a valid form for
> DW_AT_upper_bound or DW_AT_lower_bound. According the the DWARF spec only
> constant, exprloc, reference classes are.

My understanding is that this is a small extension to DWARF, because...

> In DWARF5 there is DW_FORM_data16, which could be used as a constant to
> express really big constants.

... there's no other way to do this in earlier versions of DWARF.
I think if you use -gdwarf-5, GNAT will switch to DW_FORM_data16.

I have a gdb patch to deal with this for fixed-point (not yet submitted).
I haven't made gdb handle the bounds case, because gdb generally doesn't
handle 128-bit types there, so it would be a much larger change.

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