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AJvYcCX6MhmwzusYGJxvlkQgBr5I0BVpdLMGdbG9eSD+ln80DZfDg3tbki++8EjLITdY2wyeCEHf2xmIArFvx0NNGLr0DjdJL7r1v2eKGV/RHMnjMazrZKNiCdvWdCE7nRrPJE1D6ADLUnQHXGszbCWyMRfe8CWU3dJQNjim5/W+pIwghKYT7G2QcCyr+wed0v1xzQM= X-Gm-Message-State: AOJu0YzFLfBTT2xTkGLDiIMpMoa2X9vdZFiKJU7BIqudz+0W2ofzkFOi OFzyV/iiKLp2U+rpWqnJ4GV2wmPrI4aYGd6TKmrqIzU5ZXDR/o7n6KNkNu3rmtlbtXgZ9pb+XqY Wv7NjQO0dpAKZziLHWKyAMrhim6A= X-Google-Smtp-Source: AGHT+IHzjx98BsYnmAja7d0mB6t4suesvUQrcPxBzmaNieyOX8eL/foFjkEX3RqvXB5ThNkK7dDIUGLd6ONttCq+wTo= X-Received: by 2002:a05:651c:1189:b0:2d5:acde:9065 with SMTP id w9-20020a05651c118900b002d5acde9065mr110370ljo.34.1712163407413; Wed, 03 Apr 2024 09:56:47 -0700 (PDT) MIME-Version: 1.0 References: <20240329203909.GS9427@gnu.wildebeest.org> <20240401150617.GF19478@gnu.wildebeest.org> <12215cd2-16db-4ee4-bd98-6a4bcf318592@cs.ucla.edu> <6239192ba9ff8aad0752309a54b633dc75a57c77.camel@tugraz.at> <8e877d2f-01e0-c786-dea5-265edbdc0c07@suse.de> In-Reply-To: Date: Wed, 3 Apr 2024 17:56:35 +0100 Message-ID: Subject: Re: Sourceware mitigating and preventing the next xz-backdoor To: Martin Uecker Cc: Michael Matz , Ian Lance Taylor , Paul Koning , Paul Eggert , Sandra Loosemore , Mark Wielaard , overseers@sourceware.org, gcc@gcc.gnu.org, binutils@sourceware.org, gdb@sourceware.org, libc-alpha@sourceware.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Jonathan Wakely via Gdb Reply-To: Jonathan Wakely Errors-To: gdb-bounces+public-inbox=simark.ca@sourceware.org Sender: "Gdb" On Wed, 3 Apr 2024 at 15:34, Martin Uecker via Gcc wrote: > I ask a very specific question: To what extend is testing > for features instead of semantic versions and/or supported > standards still necessary? This seems like a problematic approach > that may have been necessary decades ago, but it seems it may be > time to move on. What standard or version should I check for to detect nl_langinfo_l support? It's in POSIX 2017 but macOS supports it in despite not being POSIX 2017 compliant. What about _get_osfhandle? Or fwrite_unlocked? What about whether the platform ABI allows aligning global objects to the cacheline size? Those are just a few of the most recent autoconf checks I've written for libstdc++ in the past few months, not decades ago.