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GET /api/patches/2218054/?format=api
{ "id": 2218054, "url": "http://patchwork.ozlabs.org/api/patches/2218054/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/acueqU9pjmEoV2-M@tucnak/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api", "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": "<acueqU9pjmEoV2-M@tucnak>", "list_archive_url": null, "date": "2026-03-31T10:15:05", "name": "c++: Implement LWG4517 - data_member_spec should throw for cv-qualified unnamed bit-fields", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "321100283413245f811afb161cd4e9b920eed609", "submitter": { "id": 671, "url": "http://patchwork.ozlabs.org/api/people/671/?format=api", "name": "Jakub Jelinek", "email": "jakub@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/acueqU9pjmEoV2-M@tucnak/mbox/", "series": [ { "id": 498168, "url": "http://patchwork.ozlabs.org/api/series/498168/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=498168", "date": "2026-03-31T10:15:05", "name": "c++: Implement LWG4517 - data_member_spec should throw for cv-qualified unnamed bit-fields", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498168/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218054/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218054/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "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\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=AQOAE3D4;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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Tue, 31 Mar 2026 10:15:09 +0000 (UTC)", "from tucnak.zalov.cz (unknown [10.44.32.9])\n by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with\n ESMTPS\n id 425401800107; Tue, 31 Mar 2026 10:15:09 +0000 (UTC)", "from tucnak.zalov.cz (localhost [127.0.0.1])\n by tucnak.zalov.cz (8.18.1/8.18.1) with ESMTPS id 62VAF6NX4123860\n (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT);\n Tue, 31 Mar 2026 12:15:06 +0200", "(from jakub@localhost)\n by tucnak.zalov.cz (8.18.1/8.18.1/Submit) id 62VAF6OE4123859;\n Tue, 31 Mar 2026 12:15:06 +0200" ], "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 sourceware.org 920854BA902D", "OpenDKIM Filter v2.11.0 sourceware.org D52704BA2E18" ], "DMARC-Filter": "OpenDMARC Filter v1.4.2 sourceware.org D52704BA2E18", "ARC-Filter": "OpenARC Filter v1.0.0 sourceware.org D52704BA2E18", "ARC-Seal": "i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1774952112; cv=none;\n b=EdvWtU+BcoRFEaiPb/re8HG6cKEZojgejUuK8a0SdL99RZQZQxSQ/+hAs5TGd2s7zVSRznHkjTuIizyQx8bPdLqCPPIcQN6Q3xed8fbSLErd64mR7URxIT4L0ed2AL8+Sj5s8pokxTlduaDfAaM+kGiEShmmBa3YxRsZBg96Rg0=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1774952112; c=relaxed/simple;\n bh=aTqmRq2NrJnzTd6gf26h30QM8lgOvNXOYh2jdaKLtvY=;\n h=DKIM-Signature:Date:From:To:Subject:Message-ID:MIME-Version;\n b=u6I+T4lrzhQsWl4C7NaAFj3qkzIgNVuVVzgX1BYWYeUCxo+J5GGfVXjyF7t2toIwD6Z0LGkFSydmjDjYeWTxvKjAHWesFOZxCu8xzo6LLkJ39rFkPFrMT47OY2wxa2lES1uom4i1fZzJsiS2Caoe+VvMIWXSnPgdMPXKEwuK7tc=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1774952112;\n h=from:from:reply-to:reply-to:subject:subject:date:date:\n message-id:message-id:to:to:cc:cc:mime-version:mime-version:\n content-type:content-type; bh=3KFSHuOqYNMBuRn/gOyH/hAKirgcvYnKy9Bg2RMV6tI=;\n b=AQOAE3D4rcwdEot/A4PbtrU0qqgXbzhLZCjMH2IrSPL+I5hdpKJWmnn35GhbXq/9C2o+w+\n WHay8wYCNLG2hnh0mwSqgfDkvb6woE8qIco3z9Tjfo3csVRdq0ERfMq7960e/6UwKvNgoi\n iBMuBfCDS5t2r8FlxFjct4PwxnBYhM4=", "X-MC-Unique": "D4xfLtxYNb-mpT_0x4piwQ-1", "X-Mimecast-MFC-AGG-ID": "D4xfLtxYNb-mpT_0x4piwQ_1774952110", "Date": "Tue, 31 Mar 2026 12:15:05 +0200", "From": "Jakub Jelinek <jakub@redhat.com>", "To": "Jason Merrill <jason@redhat.com>, Marek Polacek <polacek@redhat.com>", "Cc": "gcc-patches@gcc.gnu.org", "Subject": "[PATCH] c++: Implement LWG4517 - data_member_spec should throw for\n cv-qualified unnamed bit-fields", "Message-ID": "<acueqU9pjmEoV2-M@tucnak>", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.93", "X-Mimecast-Spam-Score": "0", "X-Mimecast-MFC-PROC-ID": "CLfOEmtYHrYTtYZQQG7Mzvtqoo-4uGFWtHSnR4MAssU_1774952110", "X-Mimecast-Originator": "redhat.com", "Content-Type": "text/plain; charset=us-ascii", "Content-Disposition": "inline", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Reply-To": "Jakub Jelinek <jakub@redhat.com>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "Hi!\n\nAs written in https://wg21.link/lwg4517 , unnamed bit-fields shall not\nbe declared with cv-qualified types, so the following patch rejects it\nwhen trying to create that in data_member_spec.\n\nTested on x86_64-linux, ok for trunk?\n\n2026-03-31 Jakub Jelinek <jakub@redhat.com>\n\n\t* reflect.cc (eval_data_member_spec): Implement C++26 LWG4517\n\t- data_member_spec should throw for cv-qualified unnamed bit-fields.\n\n\t* g++.dg/reflect/data_member_spec2.C: Add tests for unnamed bit-fields\n\twith const and/or volatile types.\n\n\n\tJakub", "diff": "--- gcc/cp/reflect.cc.jj\t2026-03-31 11:43:08.470682834 +0200\n+++ gcc/cp/reflect.cc\t2026-03-31 12:02:27.369092702 +0200\n@@ -5858,6 +5858,15 @@ eval_data_member_spec (location_t loc, c\n if (tree_int_cst_sgn (args[3]) < 0)\n \treturn throw_exception (loc, ctx, \"bit_width is negative\",\n \t\t\t\tfun, non_constant_p, jump_target);\n+ if (args[1] == NULL_TREE\n+\t && eval_is_const (type, REFLECT_UNDEF) == boolean_true_node)\n+\treturn throw_exception (loc, ctx, \"name unspecified and type is const\",\n+\t\t\t\tfun, non_constant_p, jump_target);\n+ if (args[1] == NULL_TREE\n+\t && eval_is_volatile (type, REFLECT_UNDEF) == boolean_true_node)\n+\treturn throw_exception (loc, ctx,\n+\t\t\t\t\"name unspecified and type is volatile\",\n+\t\t\t\tfun, non_constant_p, jump_target);\n }\n if (args[2])\n {\n--- gcc/testsuite/g++.dg/reflect/data_member_spec2.C.jj\t2026-03-27 10:17:16.118298364 +0100\n+++ gcc/testsuite/g++.dg/reflect/data_member_spec2.C\t2026-03-31 12:05:23.886107143 +0200\n@@ -86,6 +86,11 @@ static_assert (!valid_data_member_spec (\n static_assert (!valid_data_member_spec (^^decomp, { .name = \"dms\" }));\n static_assert (!valid_data_member_spec (^^decomp_ref, { .name = \"dms\" }));\n static_assert (!valid_data_member_spec (^^arr, { .name = \"dms\" }));\n+static_assert (!valid_data_member_spec (^^const int, { .bit_width = 3 }));\n+static_assert (!valid_data_member_spec (^^volatile short, { .bit_width = 7 }));\n+static_assert (!valid_data_member_spec (^^const int, { .bit_width = 0 }));\n+static_assert (!valid_data_member_spec (^^volatile short, { .bit_width = 0 }));\n+static_assert (!valid_data_member_spec (^^const volatile char, { .bit_width = 2 }));\n \n constexpr auto dms = data_member_spec (^^int, { .name = \"dms\" });\n static_assert (!valid_data_member_spec (dms, { .name = \"dms\" }));\n", "prefixes": [] }