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From: "simark at simark dot ca" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug exp/26875] Incorrect value printed for address of first element
 of zero-length array
Date: Fri, 20 Nov 2020 18:00:51 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26875

--- Comment #7 from Simon Marchi <simark at simark dot ca> ---
I am not able to reproduce.  In my version of the compiled test case, both
bounds are const:

(top-gdb) p type->bounds ()->low.kind ()
$4 =3D PROP_CONST
(top-gdb) p type->bounds ()->high.kind ()
$5 =3D PROP_CONST

What compiler do you use to build the test case?  In my version, this is the
DIE that corresponds to the type of the zero-length field:

0x00000076:   DW_TAG_array_type
                DW_AT_type [DW_FORM_ref4]       (0x00000044 "int")
                DW_AT_sibling [DW_FORM_ref4]    (0x00000086)

0x0000007f:     DW_TAG_subrange_type
                  DW_AT_type [DW_FORM_ref4]     (0x0000003d "long unsigned
int")
                  DW_AT_count [DW_FORM_data1]   (0x00)

So I presume GDB translates that to two constant bounds with value 0.  What
does it look like in yours?

I stumbled on a similar problem and filed this bug here, they are likely
related:

https://sourceware.org/bugzilla/show_bug.cgi?id=3D26901

I have this patch series in the pipeline that I made to address 26901:

https://review.lttng.org/c/binutils-gdb/+/4399/4

If/when I am able to reproduce this (26875) bug, I can check if that helps =
with
it too.

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