[Bug gdb/29316] New: gdb-add-index always generates an error when libdebuginfod wasn't compiled in

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

https://sourceware.org/bugzilla/show_bug.cgi?id=29316

            Bug ID: 29316
           Summary: gdb-add-index always generates an error when
                    libdebuginfod wasn't compiled in
           Product: gdb
           Version: 12.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: mark at klomp dot org
  Target Milestone: ---

gdb-add-index contains:

$GDB --batch -nx -iex 'set auto-load no' \
    -iex 'set debuginfod enabled off' \
    -ex "file $file" -ex "save gdb-index $dwarf5 $dir"

So it always disables debuginfod.
But gdb/debuginfod-support.c has:

/* Set callback for "set debuginfod enabled".  */ 

static void 
set_debuginfod_enabled (const char *value) 
{ 
#if defined(HAVE_LIBDEBUGINFOD) 
  debuginfod_enabled = value; 
#else 
  error (NO_IMPL); 
#endif 
}

So when not compiled against libdebuginfod that will always generate a error on
stderr.

This causes some testcase in dwz to FAIL, because any output to stderr is seen
as failure.

It also makes package build logs (if they use gdb-add-index) somewhat noisy.

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