From owner-freebsd-toolchain@freebsd.org Sun Nov 19 23:56:17 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 59D99DC14DE for ; Sun, 19 Nov 2017 23:56:17 +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 488BD68561 for ; Sun, 19 Nov 2017 23:56:17 +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 vAJNuHIP096254 for ; Sun, 19 Nov 2017 23:56:17 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-toolchain@FreeBSD.org Subject: [Bug 223752] clang __attribute__((constructor)) gets wrong input parameters Date: Sun, 19 Nov 2017 23:56:17 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: dimitri.staessens@ugent.be 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: 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: 2.1.25 Precedence: list List-Id: Maintenance of FreeBSD's integrated toolchain List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Nov 2017 23:56:17 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D223752 --- Comment #7 from dstaesse --- (In reply to Mark Millard from comment #5) Good point, we only tried amd64 and i386.=20 This feature seems to be very sparsely documented, with some sources saying everything but void func(void) is undefined behaviour and others stating th= at it can have the same signature as the main() function. The GNU compiler documentation doesn't give details and clang doesn't document it at all. I'= ve seen other projects use this, though. The compiler doesn't seem to check the function signature at all, I've trie= d to set the constructor attribute to functions with all sorts of parameters and complaints. If this is undefined behaviour, do you know of a portable way to access argv from a shared library without passing it as a function parameter to some in= it call? --=20 You are receiving this mail because: You are the assignee for the bug.=