On Wed, 28 Jun 2023 at 16:58, Tom Tromey via Libstdc++ <
libstdc++@gcc.gnu.org> wrote:

> The libstdc++ test suite checks whether gdb type printers are
> available like so:
>
>     set do_whatis_tests [gdb_batch_check "python print(gdb.type_printers)"
> \
>                            "\\\[\\\]"]
>
> This regexp assumes that the list of printers is empty.  However,
> sometimes it's convenient to ship a gdb that comes with some default
> printers, causing this to erroneously report that gdb is "too old".
>
> I believe the intent of this check is to ensure that gdb.type_printers
> exists -- not to check its starting value.  This patch changes the
> check to accept any Python list as output.
>
> Note that the patch doesn't look for the trailing "]".  I tried this
> but in my case the output was too long for expect.  It seemed fine to
> just check the start, as the point really is to reject the case where
> the command prints an error message.
>


Looks good. OK for trunk, and OK to backport after some soak time on trunk.
Thanks.



>         * testsuite/lib/gdb-test.exp (gdb-test): Relax type-printer
>         regexp.
> ---
>  libstdc++-v3/testsuite/lib/gdb-test.exp | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/libstdc++-v3/testsuite/lib/gdb-test.exp
> b/libstdc++-v3/testsuite/lib/gdb-test.exp
> index 3728a060aa4..d8e572ef7b3 100644
> --- a/libstdc++-v3/testsuite/lib/gdb-test.exp
> +++ b/libstdc++-v3/testsuite/lib/gdb-test.exp
> @@ -107,8 +107,12 @@ proc gdb-test { marker {selector {}} {load_xmethods
> 0} } {
>         }
>      }
>
> +    # A very old version of gdb will not have the type_printers
> +    # global.  Some organizations may ship a gdb that has some default
> +    # type printers, so accept any list output as indication that the
> +    # global exists.
>      set do_whatis_tests [gdb_batch_check "python
> print(gdb.type_printers)" \
> -                          "\\\[\\\]"]
> +                          "\\\[.+"]
>      if {!$do_whatis_tests} {
>         send_log "skipping 'whatis' tests - gdb too old"
>      }
> --
> 2.40.1
>
>