{"id":2226659,"url":"http://patchwork.ozlabs.org/api/covers/2226659/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhunv1vldi.gcc.gcc-TEST.redi.40.1.0@forge-stage.sourceware.org/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-22T18:03:17","name":"[v1,0/1] libstdc++: Add poison pill for chrono::from_stream","submitter":{"id":93210,"url":"http://patchwork.ozlabs.org/api/people/93210/?format=json","name":"Jonathan Wakely via Sourceware Forge","email":"forge-bot+redi@forge-stage.sourceware.org"},"mbox":"http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhunv1vldi.gcc.gcc-TEST.redi.40.1.0@forge-stage.sourceware.org/mbox/","series":[{"id":501063,"url":"http://patchwork.ozlabs.org/api/series/501063/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=501063","date":"2026-04-22T18:03:17","name":"libstdc++: Add poison pill for chrono::from_stream","version":1,"mbox":"http://patchwork.ozlabs.org/series/501063/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2226659/comments/","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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server2.sourceware.org","From":"Jonathan Wakely via Sourceware Forge\n ","Date":"Wed, 22 Apr 2026 18:03:17 +0000","Subject":"[PATCH v1 0/1] libstdc++: Add poison pill for chrono::from_stream","To":"gcc-patches mailing list ","Message-ID":"\n ","X-Mailer":"batrachomyomachia","X-Pull-Request-Organization":"gcc","X-Pull-Request-Repository":"gcc-TEST","X-Pull-Request":"https://forge.sourceware.org/gcc/gcc-TEST/pulls/40","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-To":"gcc-patches mailing list , redi@gcc.gnu.org","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"Hi gcc-patches mailing list,\nJonathan Wakely via Sourceware Forge has requested that the following forgejo pull request\nbe published on the mailing list.\n\nCreated on: 2025-03-07 15:04:35+00:00\nLatest update: 2025-08-13 03:41:24+00:00\nChanges: 1 changed files, 4 additions, 0 deletions\nHead revision: redi/gcc ref from_stream-adl commit 5b8e44a0eff642731e54648f4ba3ff6afec9b0c1\nBase revision: gcc/gcc-TEST ref trunk commit 2427793af1e545506e0315f8ec06adf73d76b3cc r15-7886-g2427793af1e545\nMerge base: 2427793af1e545506e0315f8ec06adf73d76b3cc\nFull diff url: https://forge.sourceware.org/gcc/gcc-TEST/pulls/40.diff\nDiscussion: https://forge.sourceware.org/gcc/gcc-TEST/pulls/40\nRequested Reviewers:\n\n[LWG 3956](https://wg21.link/lwg3956) (approved in Hagenberg, February 2025) decided that `from_stream`\nshould be found *only* by ADL, not ordinary unqualified lookup. Add a\npoison pill overload to `chrono::__detail` where the `__parsable` concept and\n`operator>>(basic_istream&, _Parser)` are defined. This ensures that when\nthey use `from_stream` unqualified ordinary lookup finds the poison pill,\nwhich is deleted, so a usable overload resolution result can only be\nfound by ADL.\n\nWe already have the `std/time/parse/parse.cc` test checking that ADL\nworks, so this doesn't add a new test.\n\n```\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/chrono_io.h (chrono::__detail::from_stream): Add\n\tdeleted function as poison pill for unqualified lookup.\n```\n\n\nChanged files:\n- M: libstdc++-v3/include/bits/chrono_io.h\n\n\nJonathan Wakely (1):\n libstdc++: Add poison pill for chrono::from_stream\n\n libstdc++-v3/include/bits/chrono_io.h | 4 ++++\n 1 file changed, 4 insertions(+)"}