[Bug gdb/29220] GDB prints wrong value at -O2

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29220

--- Comment #2 from Tom Tromey <tromey at sourceware dot org> ---
readelf -wi shows 'a' defined as:

 <2><4c>: Abbrev Number: 3 (DW_TAG_variable)
    <4d>   DW_AT_name        : a
    <4f>   DW_AT_decl_file   : 1
    <50>   DW_AT_decl_line   : 8
    <51>   DW_AT_decl_column : 8
    <52>   DW_AT_type        : <0x5f>
    <56>   DW_AT_location    : 0x10 (location list)
    <5a>   DW_AT_GNU_locviews: 0xc

However the location lists say:

    00000010 v000000000000002 v000000000000003 views at 0000000c for:
             0000000000401020 0000000000401020 (DW_OP_lit0; DW_OP_stack_value)
    0000001d v000000000000003 v000000000000004 views at 0000000e for:
             0000000000401020 0000000000401020 (DW_OP_lit1; DW_OP_stack_value)


So on the one hand, I think gcc is setting the default here
and gdb is printing 0 correctly.

On the other hand, maybe locviews mean that gdb could sometimes show '1'.
I don't know though, and I can't find documentation on this attribute.

Anyway I tend to think this is at worst a missing feature from gdb.

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