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From: "dave dot korn dot cygwin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/39578] Linkage broken for dllimport vtables
Date: Sun, 29 Mar 2009 17:47:00 -0000 [thread overview]
Message-ID: <20090329174708.22109.qmail@sourceware.org> (raw)
In-Reply-To: <bug-39578-14702@http.gcc.gnu.org/bugzilla/>
------- Comment #1 from dave dot korn dot cygwin at gmail dot com 2009-03-29 17:47 -------
For Cygwin, we just recently made --enable-auto-import the default in CVS
binutils. Now that we're moving to shared library runtimes throughout it made
sense.
However, I think this is a real bug, as it doesn't happen on 4.3.2; we get a
direct undefined reference to the import symbol in the object file:
$ g++ -g -o vttest.exe vttest.cpp libvttest.dll.a --save-temps
admin@ubik /tmp/vttest
$ nm vttest.o
00000000 b .bss
00000000 d .data
00000000 N .debug_abbrev
00000000 N .debug_aranges
00000000 N .debug_frame
00000000 N .debug_info
00000000 N .debug_line
00000000 N .debug_loc
00000000 N .debug_pubnames
00000000 N .debug_ranges
00000000 N .debug_str
00000000 d .eh_frame
00000000 t .text
00000000 t .text$_ZN10TestObjectC1Ev
00000000 T __ZN10TestObjectC1Ev
U ___gxx_personality_v0
U ___main
U __imp___ZN10TestObject8VirtFuncEv
U __imp___ZTV10TestObject
00000000 T _main
admin@ubik /tmp/vttest
$
My earlier build of 4.3.3 with the patch for PR36654 reverted does the same
thing. However, as soon as I reapplied the patch and rebuilt cc1plus, I got
this output:
/tmp/vttest $ nm vttest.o libvtt
00000000 b .bss
00000000 d .data
00000000 N .debug_abbrev
00000000 N .debug_aranges
00000000 N .debug_frame
00000000 N .debug_info
00000000 N .debug_line
00000000 N .debug_loc
00000000 N .debug_pubnames
00000000 N .debug_ranges
00000000 N .debug_str
00000000 d .eh_frame
00000000 t .text
00000000 t .text$_ZN10TestObjectC1Ev
00000000 T __ZN10TestObjectC1Ev
U __ZTV10TestObject
U ___gxx_personality_v0
U ___main
U __imp___ZN10TestObject8VirtFuncEv
00000000 T _main
/tmp/vttest $
So I think that confirms it.
--
dave dot korn dot cygwin at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dave dot korn dot cygwin at
| |gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39578
next prev parent reply other threads:[~2009-03-29 17:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-29 15:28 [Bug target/39578] New: " tdragon at tdragon dot net
2009-03-29 17:47 ` dave dot korn dot cygwin at gmail dot com [this message]
2009-04-16 20:34 ` [Bug target/39578] " pinskia at gcc dot gnu dot org
2009-09-12 9:54 ` ktietz at gcc dot gnu dot org
[not found] <bug-39578-4@http.gcc.gnu.org/bugzilla/>
2013-12-17 20:09 ` ktietz at gcc dot gnu.org
2013-12-18 0:50 ` tdragon at tdragon dot net
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