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dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none Received: from CH2PR10MB4344.namprd10.prod.outlook.com (2603:10b6:610:af::19) by CH0PR10MB4826.namprd10.prod.outlook.com (2603:10b6:610:c4::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4544.14; Tue, 28 Sep 2021 20:31:13 +0000 Received: from CH2PR10MB4344.namprd10.prod.outlook.com ([fe80::25f8:eaf:a3b9:fe86]) by CH2PR10MB4344.namprd10.prod.outlook.com ([fe80::25f8:eaf:a3b9:fe86%3]) with mapi id 15.20.4544.022; Tue, 28 Sep 2021 20:31:13 +0000 To: richard Biener Subject: [patch][gcc12-changes] Add a new item about the support for automatic static variable initialization Thread-Topic: [patch][gcc12-changes] Add a new item about the support for automatic static variable initialization Thread-Index: AQHXtKfH5t6XkXoR4UyxxdgZ+1/rUw== Date: Tue, 28 Sep 2021 20:31:13 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3608.120.23.2.7) x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 269e9363-dda2-4d1f-e94e-08d982beea2c x-ms-traffictypediagnostic: CH0PR10MB4826: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:669; 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Kees provided most of the wording. Please take a look and let’s know whether it’s good for commit? thanks. Qing ================================================ From: qing zhao Date: Tue, 28 Sep 2021 12:01:42 -0700 Subject: [PATCH] gcc-12/changes.html: Uninitialized stack variables initialization update * htdocs/gcc-12/changes.html (Eliminating uninitialized variables): Item about the support for automatic static variable initialization. --- htdocs/gcc-12/changes.html | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html index 1f156a9..8e2979c 100644 --- a/htdocs/gcc-12/changes.html +++ b/htdocs/gcc-12/changes.html @@ -245,6 +245,25 @@ a work-in-progress.

Other significant improvements

+

Eliminating uninitialized variables

+ +
    +
  • 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 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 used to + fill variables with 0x00, which tends to provide a safer state for + bugs (e.g. pointers are NULL, strings are NULL filled, and sizes + and indices are 0). +
    • +
+

Debugging formats