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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug testsuite/27787] FAIL: gdb.python/flexible-array-member.exp:
 python print(zs['items'].type.range())
Date: Fri, 30 Apr 2021 09:42:38 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27787

--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Simon Marchi from comment #3)
> (In reply to Tom de Vries from comment #2)
> > (In reply to Simon Marchi from comment #1)
> > > Which compiler?  I presume this is very debug-info sensitive.
> >=20
> > Fails with gcc 7.5.0 and 8.4.0.
> >=20
> > Passes with gcc 9.3.1, 10.3.0 and 11.0.1.
>=20
> Thanks, I'll try it soon.  I am guessing that we'll just get different
> values, and that we'll end up changing the regexp to accept these values =
too.

I compared 8.4.0 and 9.3.1, and found a difference in debug info.

In case of 8.4.0, we have variable zs:
...
 <1><1f0>: Abbrev Number: 9 (DW_TAG_variable)
    <1f1>   DW_AT_name        : zs
    ...
    <1f7>   DW_AT_type        : <0x205>
...
with type:
...
 <1><205>: Abbrev Number: 10 (DW_TAG_pointer_type)
    <206>   DW_AT_byte_size   : 8
    <207>   DW_AT_type        : <0x176>
...
pointing to struct type:
...
 <1><176>: Abbrev Number: 4 (DW_TAG_structure_type)
    <177>   DW_AT_name        : zero_size
...
with member:
...
 <2><18e>: Abbrev Number: 6 (DW_TAG_member)
    <18f>   DW_AT_name        : items
    <196>   DW_AT_type        : <0x19c>
...
with type:
...
 <1><19c>: Abbrev Number: 7 (DW_TAG_array_type)
    <19d>   DW_AT_type        : <0xfb>
    <1a1>   DW_AT_sibling     : <0x1ab>
 <2><1a5>: Abbrev Number: 8 (DW_TAG_subrange_type)
    <1a6>   DW_AT_type        : <0xf4>
 <2><1aa>: Abbrev Number: 0
...

The same for 9.3.1, but with DW_AT_count 0 in the subrange:
...
 <1><19c>: Abbrev Number: 7 (DW_TAG_array_type)
    <19d>   DW_AT_type        : <0xfb>
    <1a1>   DW_AT_sibling     : <0x1ac>
 <2><1a5>: Abbrev Number: 9 (DW_TAG_subrange_type)
    <1a6>   DW_AT_type        : <0xf4>
    <1aa>   DW_AT_count       : 0
...

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