[Bug testsuite/31573] [gdb/testsuite] FAIL: gdb.base/ctf-ptype.exp: ptype linked list structure

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31573

--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
First let's note that:
- gcc defaults to dwarf5 starting gcc 11 (with some exceptions, which do not
  include linux)
- gcc supports -gctf starting gcc 12.

The compiler I'm using is a bit different, because:
- it's gcc 12 so it supports gtcf, but 
- it also defaults to dwarf4 instead of dwarf5.

I investigated on another system, where the gcc both supports gctf and defaults
to dwarf5, found that no dwarf info is generated in that case, and investigated
why.

It's because in the dwarf4 default case, there's only:
...
        .file   "ctf-ptype.c"
...
which does not active this code in dwarf2_directive_filename:
...
  /* A .file directive implies compiler generated debug information is          
     being supplied.  Turn off gas generated debug info.  */
  if (debug_type == DEBUG_DWARF2)
    purge_generated_debug (false);
  debug_type = DEBUG_NONE;
...
while with the dwarf5 default case, there's also:
...
        .file 0 "/home/vries/gdb"
"/data/vries/gdb/src/gdb/testsuite/gdb.base/ctf-ptype.c"
...
which does active that bit of code, setting debug_type to DEBUG_NONE, which
means no dwarf is generated.

So, another way of dealing with this would be to set debug_type to DEBUG_NONE
also for the simple .file directive.

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