X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: sourceware.org Message-ID: <4BBA9951.7080706@gmail.com> Date: Tue, 06 Apr 2010 03:15:45 +0100 From: Dave Korn User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: cygwin AT cygwin DOT com Subject: Re: test results on Cygwin References: <201004051747 DOT 40474 DOT bruno AT clisp DOT org> <201004052348 DOT 22022 DOT bruno AT clisp DOT org> <4BBA5C54 DOT 9040702 AT redhat DOT com> In-Reply-To: <4BBA5C54.9040702@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com On 05/04/2010 22:55, Eric Blake wrote: > [moving to the cygwin list from bug-gnulib] > > On 04/05/2010 03:48 PM, Bruno Haible wrote: >>> Failures on Cygwin 1.7.2 >>> ------------------------ >>> >>> Starting test_cond .../bin/sh: line 5: 4200 Aborted >>> FAIL: test-cond.exe >>> >>> Starting test_lock .../bin/sh: line 5: 2296 Aborted >>> FAIL: test-lock.exe >>> >>> Starting test_tls .../bin/sh: line 5: 2656 Aborted >>> FAIL: test-tls.exe >> These were all due to the fact that gcc 4.3.x on Cygwin 1.7.2 >> accepts "#pragma weak foo", but the symbol foo then evaluates >> to the NULL address, even if foo is defined in libc. > > Dave, are weak symbols something that should work on cygwin with new > enough binutils/gcc? Or is this an indicator of a gcc bug, for silently > accepting #pragma weak foo that it can't support? Weak symbols work on Cygwin, but the semantics of undefined weak symbols aren't identical to ELF platforms: a weak reference won't pull in an archive member that wouldn't otherwise be linked; the implications in relation to import libraries should be fairly obvious. Also, I haven't actually verified that "#pragma weak" is hooked up to DTRT in the same way as using a weak attribute on a declaration (but also have no particular reason to suspect it wouldn't work). cheers, DaveK -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple