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Sat, 22 May 2021 01:32:05 +0000 From: "naohirot@fujitsu.com" To: Mike Frysinger CC: "libc-alpha@sourceware.org" Subject: Re: [PATCH v4] configure: Replaced obsolete AC_TRY_COMPILE Thread-Topic: [PATCH v4] configure: Replaced obsolete AC_TRY_COMPILE Thread-Index: AQHXRgYPFx6iH9UetEmGInfwNOACSKruwtqAgAAFQvo= Date: Sat, 22 May 2021 01:32:05 +0000 Message-ID: References: <20210510140755.844333-1-naohirot@fujitsu.com> <20210511013454.895309-1-naohirot@fujitsu.com>, In-Reply-To: Accept-Language: en-001, ja-JP, en-US Content-Language: aa X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gentoo.org; dkim=none (message not signed) header.d=none;gentoo.org; dmarc=none action=none header.from=fujitsu.com; x-originating-ip: [210.162.30.49] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a4c74732-f3bc-4443-ccaa-08d91cc16842 x-ms-traffictypediagnostic: TYCPR01MB6495: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: fujitsu.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TYAPR01MB6025.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a4c74732-f3bc-4443-ccaa-08d91cc16842 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 May 2021 01:32:05.2303 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: eDx2c0pRkIr97JdqS0HS7fQfySiLdrqtgox2NmobAwYb5iYE2SdePdGWR7mqyWqgzOeodFVc6eVxl0teG69zlQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYCPR01MB6495 X-Spam-Status: No, score=-3.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 May 2021 01:32:11 -0000 Hi Mike,=0A= =0A= Thanks for the comment.=0A= =0A= > =0A= > On 11 May 2021 01:34, Naohiro Tamura wrote:=0A= > > --- a/configure.ac=0A= > > +++ b/configure.ac=0A= > >=0A= > > -[AC_TRY_COMPILE([], [=0A= > > +[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[=0A= > > #ifdef _FORTIFY_SOURCE=0A= > > # error bogon=0A= > > -#endif],=0A= > > +#endif]])],=0A= > =0A= > this can be AC_PREPROC_IFELSE=0A= =0A= In case of _FORTIFY_SOURCE, it requires compiler optimize option more than = -O1.=0A= =0A= $ man FEATURE_TEST_MACROS=0A= =0A= If _FORTIFY_SOURCE is set to 1, with compiler optimization level 1 (gcc = -O1) and above, checks that shouldn't change the behavior of con=1B$B!>= =1B(B=0A= forming programs are performed. With _FORTIFY_SOURCE set to 2, some mor= e checking is added, but some conforming programs might fail.=0A= =0A= Thanks.=0A= Naohiro=0A=