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From: "mark at klomp 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 15:14:54 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26987

--- Comment #15 from Mark Wielaard <mark at klomp dot org> ---
BTW. I was wrong about gcc/g++ emitting a DW_AT_location with DW_FORM_block=
 for
DWARF4. We have a testcase testsuite/dwz.tests/varval.S which was generated
using gdb/testsuite/gdb.dwarf2/varval.exp from repo
git://sourceware.org/git/binutils-gdb.git which does this.

It has a special rule that says:=20

# If FORM is 'SPECIAL_expr', then VALUE is treated as a location
# expression.  The effective form is then DW_FORM_block, and VALUE
# is passed to the (internal) '_location' proc to be translated.
# This proc implements a miniature DW_OP_ assembler.

Which is obviously wrong for DWARF version 4+.

--=20
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