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GET /api/1.1/patches/2224715/?format=api
{ "id": 2224715, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2224715/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260417211713.450546-1-jwakely@redhat.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/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 }, "msgid": "<20260417211713.450546-1-jwakely@redhat.com>", "date": "2026-04-17T21:16:31", "name": "[wwwdocs] Document change to -std=gnu++20 and non-experimental C++20 support", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b384d6769fbee64fe28aecf918a0207d488c5288", "submitter": { "id": 48004, "url": "http://patchwork.ozlabs.org/api/1.1/people/48004/?format=api", "name": "Jonathan Wakely", "email": "jwakely@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260417211713.450546-1-jwakely@redhat.com/mbox/", "series": [ { "id": 500405, "url": "http://patchwork.ozlabs.org/api/1.1/series/500405/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500405", "date": "2026-04-17T21:16:31", "name": "[wwwdocs] Document change to -std=gnu++20 and non-experimental C++20 support", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500405/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224715/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224715/checks/", "tags": {}, "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=T57XarFr;\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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Fri, 17 Apr 2026 21:17:14 +0000 (UTC)" ], "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 sourceware.org C65914CD2000", "OpenDKIM Filter v2.11.0 sourceware.org 7F3574CCCA23" ], "DMARC-Filter": "OpenDMARC Filter v1.4.2 sourceware.org 7F3574CCCA23", "ARC-Filter": "OpenARC Filter v1.0.0 sourceware.org 7F3574CCCA23", "ARC-Seal": "i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776460641; cv=none;\n b=r2ftsAQAXBwtG4GBj//1twcbEBkREjUY7LRFMXLlTlsQBm4IVJ4ThsqkaVmXs5Tl5xLwriitk/1Ynt7Qzhefd3EzpHrQypwscbG1/uLXRuggP0K2k6CQ3fYlwhfYd0pajTpwZOKQiU4jBAfTAXd6TysqyQC4oVvfJ6JuLElRAjw=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776460641; c=relaxed/simple;\n bh=qC9cXtLwPpQoxr9ZYBoOu33/N1TMxewVp2ZxI5267k4=;\n h=DKIM-Signature:From:To:Subject:Date:Message-ID:MIME-Version;\n b=B/hp5Qp401Gtkyu7p7E4oOfNsggSbYbq7q2jQ4/YC+mHYGxHBMnGE2UO2moDRjedQlD6PSnapePVNoFPPHbQqF6OMpteGbmiNdtA5d5gD8sggotLJ9rDduEOT1g9dM9ZL64Ee2uaOya0x6lJzXQ8o6u4vPD416Qn+Oecf2iFjdw=", "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=1776460641;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=uHZ0ZpnN7qeZtZSurYjJCUgHW4tXv+PZA+9TVTvYzJw=;\n b=T57XarFrJ3hLqGr+YUdAq4Aota2RQfYKUM88QkYoRyiKr/KVJv8xC9BptQIf5VJr64z6EO\n izrm/dT5kWqJoVtt4cf2qoQx4/TPMDpCSTXyz5M2Y+UDiFx/F715dpG8hucB1XRJpyPUTl\n pVpVY91aXRI5UHCtca51udM33SnzRBA=", "X-MC-Unique": "4w9GBAJIN8y3IDXkWHHEFQ-1", "X-Mimecast-MFC-AGG-ID": "4w9GBAJIN8y3IDXkWHHEFQ_1776460637", "From": "Jonathan Wakely <jwakely@redhat.com>", "To": "gcc-patches@gcc.gnu.org,\n\tlibstdc++@gcc.gnu.org", "Cc": "Jason Merrill <jason@redhat.com>", "Subject": "[wwwdocs] Document change to -std=gnu++20 and non-experimental C++20\n support", "Date": "Fri, 17 Apr 2026 22:16:31 +0100", "Message-ID": "<20260417211713.450546-1-jwakely@redhat.com>", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 3.0 on 10.30.177.12", "X-Mimecast-Spam-Score": "0", "X-Mimecast-MFC-PROC-ID": "CTW4bMYeibmB90Eidg7g9DwJU2jnE-m7Kf35hND60Lg_1776460637", "X-Mimecast-Originator": "redhat.com", "Content-Type": "text/plain", "Content-Transfer-Encoding": "8bit", "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>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "Does this look OK for wwwdocs?\n\nThere are other libstdc++ changes that should be added to this page, and\nthe porting_to.html page needs work, but this is the main thing.\n\n---\n htdocs/gcc-16/changes.html | 21 +++++++++++++++++----\n 1 file changed, 17 insertions(+), 4 deletions(-)", "diff": "diff --git a/htdocs/gcc-16/changes.html b/htdocs/gcc-16/changes.html\nindex fb0719d5..56c63e99 100644\n--- a/htdocs/gcc-16/changes.html\n+++ b/htdocs/gcc-16/changes.html\n@@ -204,6 +204,16 @@ for general information.</p>\n <h3 id=\"cxx\">C++</h3>\n \n <ul>\n+ <li>C++20 by default: GCC 16 changes the default language version\n+ for C++ compilation from\n+ <a href=\"https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1\">-std=gnu++17</a>\n+ to\n+ <a href=\"https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1\">-std=gnu++20</a>.\n+ If your code relies on older versions of the C++ standard, you will need to\n+ either add\n+ <a href=\"https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1\">-std=</a>\n+ to your build flags, or port your code; see <a href=\"porting_to.html#cxx23\">the porting notes</a>.\n+ </li>\n <li>Several C++26 features have been implemented:\n <ul>\n <li><a href=\"https://wg21.link/P2996R13\">P2996R13</a>, Reflection\n@@ -295,8 +305,11 @@ struct Affected : E\n C++17 mode.\n </li>\n \n- <li>Improved experimental support for C++20, including:\n+ <li>Improved support for C++20, including:\n <ul>\n+ <li>\n+ The C++20 implementation is no longer experimental.\n+ </li>\n <li>\n Working <code>std::chrono::current_zone()</code> on Windows\n (thanks to Björn Schäpers).\n@@ -331,9 +344,9 @@ struct Affected : E\n Representation of some range adaptors in <code><ranges></code>.\n </li>\n </ul>\n- This list is not necessarily complete. As with all experimental support,\n- programs using C++20 components should assume that those components\n- are not compatible between different major releases.\n+ This list is not necessarily complete. As C++20 support was experimental\n+ before GCC 16, programs using C++20 components should assume that those\n+ components are not compatible with older releases.\n </li>\n <li>Improved experimental support for C++23, including:\n <ul>\n", "prefixes": [ "wwwdocs" ] }