From owner-freebsd-toolchain@freebsd.org Mon Aug 7 07:43:36 2017 Return-Path: Delivered-To: freebsd-toolchain@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 83988DC16AD for ; Mon, 7 Aug 2017 07:43:36 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 71E958362A for ; Mon, 7 Aug 2017 07:43:36 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v777hZ16059780 for ; Mon, 7 Aug 2017 07:43:36 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-toolchain@FreeBSD.org Subject: [Bug 221288] lang/gcc5 links against libsupc++ when compiling Date: Mon, 07 Aug 2017 07:43:35 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Ports & Packages X-Bugzilla-Component: Individual Port(s) X-Bugzilla-Version: Latest X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: theraven@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-toolchain@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-toolchain@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Maintenance of FreeBSD's integrated toolchain List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Aug 2017 07:43:36 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221288 David Chisnall changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |theraven@FreeBSD.org --- Comment #4 from David Chisnall --- (In reply to Gerald Pfeifer from comment #1) Using libstdc++ is moderately dangerous on FreeBSD, as it is not the system= C++ standard library. It is only moderately dangerous though, because it uses different symbol names for the standard library symbols and so should resul= t in a hard linker error if attempting to use it for a public interface with something linked against libc++. Using libsupc++; however, is very dangerous. It exports symbols with the s= ame names as those exported by libcxxrt. These are likely to interfere in ways that cause exciting forms of breakage. The gcc ports should not be install= ing a libstdc++ that links to libsupc++. As to clang not working with libstdc++, last time I tried it -stdlib=3Dlibs= tdc++ worked, and would pick up the correct libstdc++ if the correct -I and -L fl= ags were passed. If this doesn't work, please file a bug report. As far as I know, --gcc-toolchain is a compile-time configuration option (from the old = and now removed autoconf LLVM build system) to specify the default path for headers, not a compiler flag. --=20 You are receiving this mail because: You are the assignee for the bug.=