From patchwork Fri Apr 1 14:33:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Malcolm X-Patchwork-Id: 52576 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id A2E6D3858427 for ; Fri, 1 Apr 2022 14:34:49 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A2E6D3858427 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1648823689; bh=zwnT1864F3DrEfTLQLdm3S5KrdzuJLTspdS5UXELc0c=; h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:From; b=HeOQMyWt6Mtcpu+OW2uwYpZtg7JyEyLkB663Af55G2nhh9rD8YhnWsSEEMjb78lgS ESbwzsc/rKPVn8YqluLnhF9qRiKlZkwUZ+rWfyvira08YyqA9uGi0hAHS+C02BVs/S iuVNoqpXlkW3CexzbzhOsfrVQROI2JBWNBL9BNCk= X-Original-To: gcc-patches@gcc.gnu.org Delivered-To: gcc-patches@gcc.gnu.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 0981A3858D28 for ; Fri, 1 Apr 2022 14:33:21 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 0981A3858D28 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-182-AWm2nuF5NXayQAIKxBFEFw-1; Fri, 01 Apr 2022 10:33:19 -0400 X-MC-Unique: AWm2nuF5NXayQAIKxBFEFw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AC8EF803FF1 for ; Fri, 1 Apr 2022 14:33:18 +0000 (UTC) Received: from t14s.localdomain.com (unknown [10.2.17.28]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3DFB45E320B; Fri, 1 Apr 2022 14:33:17 +0000 (UTC) To: gcc-patches@gcc.gnu.org Subject: [wwwdocs] gcc-12: linkify various options Date: Fri, 1 Apr 2022 10:33:15 -0400 Message-Id: <20220401143315.240513-1-dmalcolm@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H5, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: David Malcolm via Gcc-patches From: David Malcolm Reply-To: David Malcolm Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Sender: "Gcc-patches" I've committed the following patch to the GCC 12 release notes. --- htdocs/gcc-12/changes.html | 47 ++++++++++++++++++++++++-------------- 1 file changed, 30 insertions(+), 17 deletions(-) diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html index f1c36258..5619acff 100644 --- a/htdocs/gcc-12/changes.html +++ b/htdocs/gcc-12/changes.html @@ -172,17 +172,20 @@ a work-in-progress.

the clang language extension was added.
  • New warnings:
      -
    • -Wbidi-chars warns about potentially misleading UTF-8 +
    • -Wbidi-chars + warns about potentially misleading UTF-8 bidirectional control characters. The default is -Wbidi-chars=unpaired (PR103026)
      • -
    • -Warray-compare warns about comparisons between two operands of - array type (PR97573)
      • +
    • -Warray-compare + warns about comparisons between two operands of + array type (PR97573)
  • Enhancements to existing warnings:
      -
    • -Wattributes has been extended so that it's +
    • -Wattributes + has been extended so that it's possible to use -Wno-attributes=ns::attr or -Wno-attributes=ns:: to suppress warnings about unknown scoped attributes (in C++11 and C2X). Similarly, @@ -208,7 +211,8 @@ a work-in-progress.

    • The #elifdef and #elifndef preprocessing directives are now supported.
    • The printf and scanf format checking - with -Wformat now supports the %b format + with -Wformat + now supports the %b format specified by C2X for binary integers, and the %B format recommended by C2X for printf.
    • @@ -263,10 +267,12 @@ a work-in-progress.

    (git)
  • Deduction guides can be declared at class scope (PR79501)
    • -
  • -Wuninitialized warns about using uninitialized variables in +
  • -Wuninitialized + warns about using uninitialized variables in member initializer lists (PR19808)
    • -
  • -Wint-in-bool-context is now disabled when instantiating +
  • -Wint-in-bool-context + is now disabled when instantiating a template (git)
  • Stricter checking of attributes on friend declarations: if a friend declaration has an attribute, that declaration must be a definition. @@ -279,13 +285,15 @@ a work-in-progress.

    and -Wc++23-extensions. They are enabled by default and can be used to control existing pedwarns about occurences of new C++ constructs in code using an old C++ standard dialect.
    • -
  • New warning -Wmissing-requires warns about missing - requires +
  • New warning + -Wmissing-requires + warns about missing requires (git)
  • The existing std::is_constant_evaluated in if warning was extended to warn in more cases (PR100995)
    • -
  • -Waddress has been enhanced so that it now warns about, for +
  • -Waddress + has been enhanced so that it now warns about, for instance, comparing the address of a nonstatic member function to null (PR102103)
  • Errors about narrowing are no longer hidden if they occur in system @@ -307,7 +315,9 @@ a work-in-progress.

  • constinit thread_local variables are optimized better (PR101786)
  • Support for C++17 std::hardware_destructive_interference_size - was added, along with the -Winterference-size warning + was added, along with the + -Winterference-size + warning (git)
  • Many bugs in the CTAD handling have been fixed (PR101344, @@ -618,16 +628,19 @@ a work-in-progress.

    Eliminating uninitialized variables

      -
    • GCC can now initialize all stack variables implicitly, including +
    • GCC can now initialize all stack variables implicitly, including padding. This is intended to eliminate all classes of uninitialized stack variable flaws. Lack of explicit initialization will still - warn when -Wuninitialized is active. For best - debugging, use of the new command-line option - -ftrivial-auto-var-init=pattern can be used to fill - variables with a repeated 0xFE pattern, which tends to + warn when + -Wuninitialized + is active. For best debugging, use of the new command-line option + -ftrivial-auto-var-init=pattern + can be used to fill variables with a repeated 0xFE pattern, which tends to illuminate many bugs (e.g. pointers receive invalid addresses, sizes and indices are very large). For best production results, the new - command-line option -ftrivial-auto-var-init=zero can be + command-line option + -ftrivial-auto-var-init=zero + can be used to fill variables with 0x00, which tends to provide a safer state for bugs (e.g. pointers are NULL, strings are NUL filled, and sizes and indices are 0).