From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from rock.gnat.com (rock.gnat.com [IPv6:2620:20:4000:0:a9e:1ff:fe9b:1d1]) by sourceware.org (Postfix) with ESMTPS id 669D5385843A for ; Thu, 30 Mar 2023 11:24:03 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 669D5385843A Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=adacore.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=adacore.com Received: from localhost (localhost.localdomain [127.0.0.1]) by filtered-rock.gnat.com (Postfix) with ESMTP id E2252116470; Thu, 30 Mar 2023 07:24:02 -0400 (EDT) X-Virus-Scanned: Debian amavisd-new at gnat.com Received: from rock.gnat.com ([127.0.0.1]) by localhost (rock.gnat.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id UHunS-1uULTn; Thu, 30 Mar 2023 07:24:02 -0400 (EDT) Received: from free.home (tron.gnat.com [IPv6:2620:20:4000:0:46a8:42ff:fe0e:e294]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by rock.gnat.com (Postfix) with ESMTPS id 2E14A1162F9; Thu, 30 Mar 2023 07:24:01 -0400 (EDT) Received: from livre (livre.home [172.31.160.2]) by free.home (8.15.2/8.15.2) with ESMTPS id 32UBNpGi1544290 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Thu, 30 Mar 2023 08:23:52 -0300 From: Alexandre Oliva To: Gerald Pfeifer Cc: Iain Sandoe , Joseph Myers , GCC Patches , Nathan Sidwell Subject: Re: [PATCH] Introduce -nolibstdc++ option Organization: Free thinker, does not speak for AdaCore References: Errors-To: aoliva@lxoliva.fsfla.org Date: Thu, 30 Mar 2023 08:23:51 -0300 In-Reply-To: (Gerald Pfeifer's message of "Sat, 11 Feb 2023 10:09:57 +0100 (CET)") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.84 X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00,GIT_PATCH_0,KAM_DMARC_STATUS,KAM_SHORT,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 List-Id: Hello, Gerald, On Feb 11, 2023, Gerald Pfeifer wrote: > On Thu, 23 Jun 2022, Alexandre Oliva via Gcc-patches wrote: >> Introduce -nostdlib++ option >> >> Using g++ to link without libstdc++, as in g++.dg/abi/pure-virtual1.C, >> is error prone, because there's no way to tell g++ to drop libstdc++ >> without also dropping libc and any other libraries that the target >> implicitly links in. > % grep -r nostdlib $WWWDOCS > % > Should this be documented in gcc-13/changes.html? Would you mind proposing > a snippet (or going ahead and pushing it)? I can't make my mind up about this. At first, the goal of adding the option was just to aid this specific test. But then, it transpired that other compilers offered a similar option, with the spelling that we ended up using, so perhaps it would make sense to document it, after all. How about this, does this seem useful? diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html index ff70d2eefecec..c1bbbfa28e18e 100644 --- a/htdocs/gcc-13/changes.html +++ b/htdocs/gcc-13/changes.html @@ -333,6 +333,9 @@ a work-in-progress.

  • The -Wpessimizing-move and -Wredundant-move warnings have been extended to warn in more contexts.
    • +
  • The -nostdlib++ + option has been added, to enable linking with g++ + without implicitly linking in the C++ standard library.

    • Runtime Library (libstdc++)

    -- Alexandre Oliva, happy hacker https://FSFLA.org/blogs/lxo/ Free Software Activist GNU Toolchain Engineer Disinformation flourishes because many people care deeply about injustice but very few check the facts. Ask me about