[Bug cli/29315] New: Completion warning: could not convert ... from the host encoding (ANSI_X3.4-1968) to UTF-32

["macro at orcam dot me.uk" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29315

            Bug ID: 29315
           Summary: Completion warning: could not convert ... from the
                    host encoding (ANSI_X3.4-1968) to UTF-32
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: macro at orcam dot me.uk
  Target Milestone: ---

Following the breakage from PR cli/29314, when debugging `cc1' from GCC
12, which has a huge number of template class functions, e.g.:

hash_table<action_record_hasher, false, xcallocator>::expand()
hash_table<action_record_hasher, false,
xcallocator>::find_slot_with_hash(action_record* const&, unsigned int,
insert_option)
hash_table<action_record_hasher, false, xcallocator>::~hash_table()
hash_table<addr_hasher, false, xcallocator>::expand()
[1100+ entries follow]

in some cases if you try to continue completing an incorrect completion
produced, then a warning is issued as follows:

(gdb) break hash_tab le<<Tab>
(gdb) break hash_tab le<warning: could not convert 'hash_tab le<' from the host
encoding (ANSI_X3.4-1968) to UTF-32.
This normally should not happen, please file a bug report.

and GDB hangs for a couple of minutes before silently returning to the 
prompt (i.e. it's not shown unless e.g. ^U is entered at this point).

This actually asks for a bug report, so here you go.

I can reproduce it with:

$ gdb /path/to/cc1

(having compiled `cc1' with debug info of course) on a native
RISC-V/Linux system, specifically the SiFive Freedom U SDK Linux
distribution provided with the HiFive Unmatched development system:

$ cat /etc/os-release
ID=nodistro
NAME="FreedomUSDK"
VERSION="2021.03.01 (2021March)"
VERSION_ID=2021.03.01
PRETTY_NAME="FreedomUSDK 2021.03.01 (2021March)"
$ 

I have no idea why a warning pops up from gdb/ada-lang.c for an
executable that contains no Ada code:

(gdb) show language
The current source language is "auto; currently c++".
(gdb) 

I may be able to provide further details later.

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