[PATCH] Relax type-printer regexp in libstdc++ test suite

[PATCH] Relax type-printer regexp in libstdc++ test suite

[Tom Tromey]

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.

	* 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

Re: [PATCH] Relax type-printer regexp in libstdc++ test suite

[Jonathan Wakely]

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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
>
>

Re: [PATCH] Relax type-printer regexp in libstdc++ test suite

[Tom Tromey]

>>>>> Jonathan Wakely <jwakely@redhat.com> writes:

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

AdaCore doesn't need a backport of this, and I don't think it's
extremely important; so unless you want me to do it, I don't plan to.

I did check it in on trunk earlier today.

thanks,
Tom

Re: [PATCH] Relax type-printer regexp in libstdc++ test suite

[Jonathan Wakely]

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On Thu, 29 Jun 2023 at 17:59, Tom Tromey <tromey@adacore.com> wrote:

> >>>>> Jonathan Wakely <jwakely@redhat.com> writes:
>
> > Looks good. OK for trunk, and OK to backport after some soak time on
> trunk. Thanks.
>
> AdaCore doesn't need a backport of this, and I don't think it's
> extremely important; so unless you want me to do it, I don't plan to.
>

OK, we can always backport it later if anybody else needs it.



> I did check it in on trunk earlier today.
>
>
Thanks.