From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1497 invoked by alias); 20 Dec 2011 21:59:04 -0000 Received: (qmail 1488 invoked by uid 22791); 20 Dec 2011 21:59:03 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 20 Dec 2011 21:58:44 +0000 From: "sipych at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/51643] Incorrect code produced for tail-call of weak function with -O2/-O3 option Date: Tue, 20 Dec 2011 22:11:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: sipych at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-12/txt/msg02303.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51643 --- Comment #4 from Alexander Osipenko 2011-12-20 21:58:39 UTC --- >>From ARM EABI specification (doc: ARM IHI 0044A) "On platforms that do not support dynamic pre-emption of symbols an unresolved weak reference to a symbol relocated by R_ARM_CALL shall be treated as a jump to the next instruction (the call becomes a no-op). The behaviour of R_ARM_JUMP24 in these conditions is unspecified." At least, tail call + epilogue shall not be replaced by (undefined) JUMP.