[Bug symtab/20899] "dwarf2_string_attr" does not check for "DW_FORM_GNU_str_index"

["raphael.kubo.da.costa at intel dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20899

Raphael Kubo da Costa <raphael.kubo.da.costa at intel dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |raphael.kubo.da.costa@intel
                   |                            |.com

--- Comment #1 from Raphael Kubo da Costa <raphael.kubo.da.costa at intel dot com> ---
Additional information: this is a regression caused by
http://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;h=7d45c7c3f692d93c3a33a043c347f1386681deb4
(dwarf2read.c: Check type of string valued attributes prior to decoding) and
has been present since 7.11.

It makes GDB print the wrong namespace names for all code built with clang and
-gsplit-dwarf, there's additional information here:
https://bugs.chromium.org/p/chromium/issues/detail?id=680654

Lech: I'm not sure your patch can be accepted as-is, see gdb/CONTRIBUTE and the
"Submitting Patches" section.

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