From: Iain Sandoe <iain@sandoe.co.uk>
To: "François Dumont" <frs.dumont@gmail.com>
Cc: GCC Development <gcc@gcc.gnu.org>,
libstdc++ <libstdc++@gcc.gnu.org>,
GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] Fix coroutine tests for libstdc++ gnu-version-namespace mode
Date: Sun, 8 Oct 2023 14:59:45 +0100 [thread overview]
Message-ID: <324ED72B-E687-4B5E-AD6E-C7A3BBDEB223@sandoe.co.uk> (raw)
In-Reply-To: <4ebb6936-d652-84a5-0028-6ca0a5d2d238@gmail.com>
Hi François,
> On 23 Sep 2023, at 21:10, François Dumont <frs.dumont@gmail.com> wrote:
>
> I'm eventually fixing those tests the same way we manage this problem in libstdc++ testsuite.
>
> testsuite: Add optional libstdc++ version namespace in expected diagnostic
>
> When libstdc++ is build with --enable-symvers=gnu-versioned-namespace diagnostics are
> showing this namespace, currently __8.
>
> gcc/testsuite/ChangeLog:
>
> * testsuite/g++.dg/coroutines/coro-bad-alloc-00-bad-op-new.C: Add optional
> '__8' version namespace in expected diagnostic.
> * testsuite/g++.dg/coroutines/coro-bad-alloc-01-bad-op-del.C: Likewise.
> * testsuite/g++.dg/coroutines/coro-bad-alloc-02-no-op-new-nt.C: Likewise.
> * testsuite/g++.dg/coroutines/coro-bad-grooaf-01-grooaf-expected.C: Likewise.
> * testsuite/g++.dg/coroutines/pr97438.C: Likewise.
> * testsuite/g++.dg/coroutines/ramp-return-b.C: Likewise.
>
> Tested under Linux x86_64.
>
> I'm contributing to libstdc++ so I already have write access.
>
> Ok to commit ?
As author of the tests, this LGTM as a suitable fix for now (at least, once the main
patch to fix versioned namespaces lands).
However, IMO, this could become quite painful as more g++ tests make use of std headers
(which is not really optional for facilities like this that are tightly-coupled between the FE and
the library).
For the future, it does seem that a more complete solution might be to introduce a
testsuite-wide definition for the C++ versioned std:: introducer, so that we can update it in one
place as the version changes.
So (as a thought experiment):
- we’d have something of the form “CXX_STD” as a tcl global
- we’d add the presence/absence of versioning to the relevant site.exp (which
means recognising the versioning choice also in the GCC configure)
- we’d migrate tests to using ${CXX_STD} instead of "std::__N” in matches
… I guess an alternative could be to cook up some alternate warning/error/etc
match functions that cater for arbitrary inline namespaces but that seems like a much
more tricky and invasive testsuite change.
thoughts?
Iain
next prev parent reply other threads:[~2023-10-08 13:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-23 20:10 François Dumont
2023-10-02 17:07 ` François Dumont
2023-10-03 9:52 ` Jonathan Wakely
2023-10-03 20:14 ` François Dumont
2023-10-08 13:59 ` Iain Sandoe [this message]
2023-10-11 4:49 ` François Dumont
2023-10-11 7:30 ` Iain Sandoe
2023-10-11 17:22 ` François Dumont
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