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{ "id": 2226101, "url": "http://patchwork.ozlabs.org/api/covers/2226101/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhu8u7e3ks.gcc.gcc-TEST.redi.4.2.0@forge-stage.sourceware.org/", "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": "<bmm.hhu8u7e3ks.gcc.gcc-TEST.redi.4.2.0@forge-stage.sourceware.org>", "list_archive_url": null, "date": "2026-04-22T08:58:14", "name": "[v2,0/1] libstdc++: Deprecate useless <cxxx> compatibility headers for C++17", "submitter": { "id": 93210, "url": "http://patchwork.ozlabs.org/api/people/93210/?format=api", "name": "Jonathan Wakely via Sourceware Forge", "email": "forge-bot+redi@forge-stage.sourceware.org" }, "mbox": "http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhu8u7e3ks.gcc.gcc-TEST.redi.4.2.0@forge-stage.sourceware.org/mbox/", "series": [ { "id": 500950, "url": "http://patchwork.ozlabs.org/api/series/500950/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500950", "date": "2026-04-22T08:58:14", "name": "libstdc++: Deprecate useless <cxxx> compatibility headers for C++17", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/500950/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2226101/comments/", "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 spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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Wed, 22 Apr 2026 08:59:19 +0000 (GMT)", "from forge-stage.sourceware.org (localhost [IPv6:::1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256)\n (No client certificate requested)\n by forge-stage.sourceware.org (Postfix) with ESMTPS id 24B814052E\n for <gcc-patches@gcc.gnu.org>; Wed, 22 Apr 2026 08:59:19 +0000 (UTC)" ], "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 sourceware.org 574BA4B9DB75", "OpenDKIM Filter v2.11.0 sourceware.org 518B24B9DB59" ], "DMARC-Filter": "OpenDMARC Filter v1.4.2 sourceware.org 518B24B9DB59", "ARC-Filter": "OpenARC Filter v1.0.0 sourceware.org 518B24B9DB59", "ARC-Seal": "i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776848359; cv=none;\n b=akqCsJvuDnn0E3xp06NOkANiJnTI77xsUFc0sObsTn+vvbCnB160vBXm7kzQ7Rkk3WOu/9ZZbBjYZdk01Iie7YaVplLnyDGyPAJyw1uWGBn/THfQavrVHopXLQv0tOBcAgT/VpeXeirDNpon4kR6tx02wZsNMx+5GDOtYjnqf2U=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776848359; c=relaxed/simple;\n bh=HavtEEpGo/t9JJ5+YN4gdfs77RC5pE3I2NtS5Ad801c=;\n h=From:Date:Subject:To:Message-ID;\n b=rrgflXLySGaRIbFLT0bdDiGdFU7WwUZuHwnp5DVEt6lU2/0majVWGtbrmSTFYf+ILcvomaq6sW1lR15A3PgB0ZLiBaFrZLW2sIGke04xiRD6KYAhzRV3obEqcp4/a8ndF2b9AfQqHkoi55JR5NpM6cZbXK2Xce5J20s6gb6bmfI=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "From": "Jonathan Wakely via Sourceware Forge\n <forge-bot+redi@forge-stage.sourceware.org>", "Date": "Wed, 22 Apr 2026 08:58:14 +0000", "Subject": "[PATCH v2 0/1] libstdc++: Deprecate useless <cxxx> compatibility\n headers for C++17", "To": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>", "Message-ID": "\n <bmm.hhu8u7e3ks.gcc.gcc-TEST.redi.4.2.0@forge-stage.sourceware.org>", "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/4", "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": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>, 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 <forge-bot+redi@forge-stage.sourceware.org> has requested that the following forgejo pull request\nbe published on the mailing list.\n\nCreated on: 2024-10-23 18:51:55+00:00\nLatest update: 2026-04-21 21:24:26+00:00\nChanges: 586 changed files, 19943 additions, 5410 deletions\nHead revision: redi/gcc ref deprecate-cheaders commit 0740f7d2e5e1ba2ec93969675a6b9baa31e48c47\nBase revision: gcc/gcc-TEST ref trunk commit a00a0e34b8a7312bcf357bd0238d6d9711ca96b2 r15-4817-ga00a0e34b8a731\nMerge base: a00a0e34b8a7312bcf357bd0238d6d9711ca96b2\nFull diff url: https://forge.sourceware.org/gcc/gcc-TEST/pulls/4.diff\nDiscussion: https://forge.sourceware.org/gcc/gcc-TEST/pulls/4\nRequested Reviewers:\n\nThese headers make no sense for C++ programs, because they either define\ndifferent content to the corresponding `<xxx.h>` C header, or define\nnothing at all in namespace std. They were all deprecated in C++17, so\nadd deprecation warnings to them, which can be disabled with\n`-Wno-deprecated`. For C++20 and later these headers are no longer in the\nstandard at all, so compiling with `_GLIBCXX_USE_DEPRECATED` defined to 0\nwill give an error when they are included.\n\nBecause `#warning` is non-standard before C++23 we need to use pragmas to\nignore `-Wc++23-extensions` for the `-Wsystem-headers -pedantic` case.\n\nOne g++ test needs adjustment because it includes `<ciso646>`, but that\ncan be made conditional on the `__cplusplus` value without any reduction\nin test coverage.\n\n```\nlibstdc++-v3/ChangeLog:\n\n * doc/xml/manual/evolution.xml: Document deprecations.\n * doc/html/*: Regenerate.\n * include/c_compatibility/complex.h (_GLIBCXX_COMPLEX_H): Move\n include guard to start of file. Include <complex> directly\n instead of <ccomplex>.\n * include/c_compatibility/tgmath.h: Include <cmath> and\n <complex> directly, instead of <ctgmath>.\n * include/c_global/ccomplex: Add deprecated #warning for C++17\n and #error for C++20 if _GLIBCXX_USE_DEPRECATED == 0.\n * include/c_global/ciso646: Likewise.\n * include/c_global/cstdalign: Likewise.\n * include/c_global/cstdbool: Likewise.\n * include/c_global/ctgmath: Likewise.\n * include/c_std/ciso646: Likewise.\n * include/precompiled/stdc++.h: Do not include ccomplex,\n ciso646, cstdalign, cstdbool, or ctgmath in C++17 and later.\n * testsuite/18_support/headers/cstdalign/macros.cc: Check for\n warnings and errors for unsupported dialects.\n * testsuite/18_support/headers/cstdbool/macros.cc: Likewise.\n * testsuite/26_numerics/headers/ctgmath/complex.cc: Likewise.\n * testsuite/27_io/objects/char/1.cc: Do not include <ciso646>.\n * testsuite/27_io/objects/wchar_t/1.cc: Likewise.\n * testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc: Removed.\n * testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc: Removed.\n * testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc: Removed.\n * testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc: Removed.\n * testsuite/18_support/headers/ciso646/macros.cc: New test.\n * testsuite/18_support/headers/ciso646/macros.h.cc: New test.\n * testsuite/18_support/headers/cstdbool/macros.h.cc: New test.\n * testsuite/26_numerics/headers/ccomplex/complex.cc: New test.\n * testsuite/26_numerics/headers/ccomplex/complex.h.cc: New test.\n * testsuite/26_numerics/headers/ctgmath/complex.h.cc: New test.\n\ngcc/testsuite/ChangeLog:\n\n * g++.old-deja/g++.other/headers1.C: Do not include ciso646 for\n C++17 and later.\n```\n\n\nChanged files:\n- A: libstdc++-v3/testsuite/18_support/headers/ciso646/macros.cc\n- A: libstdc++-v3/testsuite/18_support/headers/ciso646/macros.h.cc\n- A: libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.h.cc\n- A: libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.h.cc\n- A: libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.cc\n- A: libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.h.cc\n- A: libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.h.cc\n- D: libstdc++-v3/testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc\n- D: libstdc++-v3/testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc\n- D: libstdc++-v3/testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc\n- D: libstdc++-v3/testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc\n- M: gcc/testsuite/g++.old-deja/g++.other/headers1.C\n- M: libstdc++-v3/doc/html/manual/api.html\n- M: libstdc++-v3/doc/xml/manual/evolution.xml\n- M: libstdc++-v3/include/c_compatibility/complex.h\n- M: libstdc++-v3/include/c_compatibility/tgmath.h\n- M: libstdc++-v3/include/c_global/ccomplex\n- M: libstdc++-v3/include/c_global/ciso646\n- M: libstdc++-v3/include/c_global/cstdalign\n- M: libstdc++-v3/include/c_global/cstdbool\n- M: libstdc++-v3/include/c_global/ctgmath\n- M: libstdc++-v3/include/c_std/ciso646\n- M: libstdc++-v3/include/precompiled/stdc++.h\n- M: libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.cc\n- M: libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.cc\n- M: libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.cc\n- M: libstdc++-v3/testsuite/27_io/objects/char/1.cc\n- M: libstdc++-v3/testsuite/27_io/objects/wchar_t/1.cc\n\n\nJonathan Wakely (1):\n libstdc++: Deprecate useless <cxxx> compatibility headers for C++17\n\n .../g++.old-deja/g++.other/headers1.C | 2 +\n libstdc++-v3/doc/html/manual/api.html | 8 +++\n libstdc++-v3/doc/xml/manual/evolution.xml | 10 ++++\n .../include/c_compatibility/complex.h | 10 ++--\n libstdc++-v3/include/c_compatibility/tgmath.h | 11 ++--\n libstdc++-v3/include/c_global/ccomplex | 9 ++++\n libstdc++-v3/include/c_global/ciso646 | 9 ++++\n libstdc++-v3/include/c_global/cstdalign | 8 +++\n libstdc++-v3/include/c_global/cstdbool | 8 +++\n libstdc++-v3/include/c_global/ctgmath | 14 +++--\n libstdc++-v3/include/c_std/ciso646 | 10 ++++\n libstdc++-v3/include/precompiled/stdc++.h | 13 +++--\n .../18_support/headers/ciso646/macros.cc | 51 +++++++++++++++++++\n .../18_support/headers/ciso646/macros.h.cc | 49 ++++++++++++++++++\n .../18_support/headers/cstdalign/macros.cc | 10 +++-\n .../18_support/headers/cstdalign/macros.h.cc | 25 +++++++++\n .../headers/cstdalign/std_c++0x_neg.cc | 24 ---------\n .../18_support/headers/cstdbool/macros.cc | 9 +++-\n .../18_support/headers/cstdbool/macros.h.cc | 21 ++++++++\n .../headers/cstdbool/std_c++0x_neg.cc | 26 ----------\n .../26_numerics/headers/ccomplex/complex.cc | 10 ++++\n .../26_numerics/headers/ccomplex/complex.h.cc | 10 ++++\n .../headers/ccomplex/std_c++0x_neg.cc | 26 ----------\n .../26_numerics/headers/ctgmath/complex.cc | 9 +++-\n .../26_numerics/headers/ctgmath/complex.h.cc | 10 ++++\n .../headers/ctgmath/std_c++0x_neg.cc | 26 ----------\n .../testsuite/27_io/objects/char/1.cc | 1 -\n .../testsuite/27_io/objects/wchar_t/1.cc | 1 -\n 28 files changed, 294 insertions(+), 126 deletions(-)\n create mode 100644 libstdc++-v3/testsuite/18_support/headers/ciso646/macros.cc\n create mode 100644 libstdc++-v3/testsuite/18_support/headers/ciso646/macros.h.cc\n create mode 100644 libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.h.cc\n delete mode 100644 libstdc++-v3/testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc\n create mode 100644 libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.h.cc\n delete mode 100644 libstdc++-v3/testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc\n create mode 100644 libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.cc\n create mode 100644 libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.h.cc\n delete mode 100644 libstdc++-v3/testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc\n create mode 100644 libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.h.cc\n delete mode 100644 libstdc++-v3/testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc\n\nRange-diff against v1:" }