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Thu, 18 Apr 2024 07:45:43 -0700 (PDT) Received: from free.home ([2804:7f1:218b:5e2:c43b:e0c4:71a:241b]) by smtp.gmail.com with ESMTPSA id x23-20020a056a00189700b006edadf8058asm1560898pfh.23.2024.04.18.07.45.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Apr 2024 07:45:43 -0700 (PDT) Received: from livre (livre.home [172.31.160.2]) by free.home (8.15.2/8.15.2) with ESMTPS id 43IEjUO12483827 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Thu, 18 Apr 2024 11:45:31 -0300 From: Alexandre Oliva To: Jonathan Wakely Cc: gcc-patches@gcc.gnu.org, libstdc++@gcc.gnu.org Subject: Re: [PATCH] [libstdc++] introduce --disable-compat-libstdcxx-abi Organization: Free thinker, does not speak for AdaCore References: Date: Thu, 18 Apr 2024 11:45:30 -0300 In-Reply-To: (Jonathan Wakely's message of "Tue, 16 Apr 2024 07:55:11 +0100") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.84 X-Spam-Status: No, score=-6.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,WEIRD_QUOTING autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Apr 16, 2024, Jonathan Wakely wrote: >> +dnl >> +dnl Enable -Wabi=2 if not overridden by --disable-compat-libstdcxx-abi. >> +dnl >> +AC_DEFUN([GLIBCXX_ENABLE_WABI], [ >> + # Default. >> + WARN_FLAGS_WABI=\ -Wabi=2 >> + AC_MSG_CHECKING([for --disable-compat-libstdcxx-abi]) >> + AC_ARG_ENABLE([compat-libstdcxx-abi], > We have the GLIBCXX_ENABLE macro to simplify creating new --enable options. *nod*. There was some reason why I didn't use it at first. Maybe it can be used with the patch as it ended up. Will revisit. >> + AC_HELP_STRING([--disable-compat-libstdcxx-abi], >> + [Disable backward-compatibility ABI symbols)]), > There's a stray ')' here. Ugh, thanks >> --- a/libstdc++-v3/doc/html/manual/configure.html >> +++ b/libstdc++-v3/doc/html/manual/configure.html > This should be in doc/xml/manual/configure.xml too, which is used to > generate the HTML using docbook. Oh, right. Doh. So much for grepping for an existing option and jumping to edit the first match :-) > The description here in the docs (and the name of the configure > option) seem much too vague. Libstdc++ has dozens, probably hundreds, > of "backward-compatibility ABI symbols", and this only affects touches > a tiny handful of them. Just the aliases created automatically by the > compiler for mangling changes, right? Yeah. I had used --disable-libstdcxx-Wabi at some point, maybe that's better. FTR, we now have a binutils patch (thanks H.J.Lu) to address the underlying problem, so we'll probably no longer need the workaround that led me to propose this change. I wonder if there's interest in keeping it. I'd be equally happy to make the adjustments, or to withdraw it (or pretty much anything in between ;-). WDYT? -- Alexandre Oliva, happy hacker https://FSFLA.org/blogs/lxo/ Free Software Activist GNU Toolchain Engineer More tolerance and less prejudice are key for inclusion and diversity Excluding neuro-others for not behaving ""normal"" is *not* inclusive