From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5443 invoked by alias); 22 Sep 2011 11:21:29 -0000 Received: (qmail 5434 invoked by uid 22791); 22 Sep 2011 11:21:28 -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; Thu, 22 Sep 2011 11:21:11 +0000 From: "vincenzo.innocente at cern dot ch" To: gcc-bugs@gcc.gnu.org Subject: [Bug lto/50483] New: lto turns visibility from HIDDEN to DEFAULT Date: Thu, 22 Sep 2011 11:26:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: lto X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: vincenzo.innocente at cern dot ch 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: 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: 2011-09/txt/msg01520.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50483 Bug #: 50483 Summary: lto turns visibility from HIDDEN to DEFAULT Classification: Unclassified Product: gcc Version: lto Status: UNCONFIRMED Severity: normal Priority: P3 Component: lto AssignedTo: unassigned@gcc.gnu.org ReportedBy: vincenzo.innocente@cern.ch Host: x86 Target: x86_64-unknown-linux-gnu Build: 4.7.0 20110919 not sure how relevant is in practice BUT in the example below one may notice that the visibility of "bar" is turned to DEFAULT by lto no lto 17: 0000000000000597 11 FUNC LOCAL HIDDEN 11 bar() lto 11: 0000000000000597 11 FUNC LOCAL DEFAULT 11 bar() .2238 cat vislto.cc void ext(); void bar() __attribute((visibility( "hidden" ))); void foo() __attribute((visibility( "default" ))); void foo() { bar();} void bar() { ext();} g++ -fPIC vislto.cc -Wall -shared -o libvislto.so [vinavx0] ~/public/ctest $ readelf -sW libvislto.so | grep -v UND | sed 's/\./ \./g' | c++filt Symbol table ' .dynsym' contains 11 entries: Num: Value Size Type Bind Vis Ndx Name 2: 0000000000000478 0 FUNC GLOBAL DEFAULT 9 _init 3: 00000000000005e8 0 FUNC GLOBAL DEFAULT 12 _fini 6: 000000000000058c 11 FUNC GLOBAL DEFAULT 11 foo() 8: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS _edata 9: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS __bss_start 10: 00000000000018e0 0 NOTYPE GLOBAL DEFAULT ABS _end Symbol table ' .symtab' contains 31 entries: Num: Value Size Type Bind Vis Ndx Name 1: 00000000000004c0 0 FUNC LOCAL DEFAULT 11 call_gmon_start 2: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff .c 3: 00000000000018a8 0 OBJECT LOCAL DEFAULT 19 __CTOR_LIST__ 4: 00000000000018b8 0 OBJECT LOCAL DEFAULT 20 __DTOR_LIST__ 5: 00000000000018c8 0 OBJECT LOCAL DEFAULT 21 __JCR_LIST__ 6: 00000000000004e0 0 FUNC LOCAL DEFAULT 11 __do_global_dtors_aux 7: 00000000000018d0 1 OBJECT LOCAL DEFAULT 22 completed .5901 8: 00000000000018d8 8 OBJECT LOCAL DEFAULT 22 dtor_idx .5903 9: 0000000000000560 0 FUNC LOCAL DEFAULT 11 frame_dummy 10: 0000000000000000 0 FILE LOCAL DEFAULT ABS vislto .cc 11: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff .c 12: 00000000000018b0 0 OBJECT LOCAL DEFAULT 19 __CTOR_END__ 13: 0000000000000650 0 OBJECT LOCAL DEFAULT 13 __FRAME_END__ 14: 00000000000018c8 0 OBJECT LOCAL DEFAULT 21 __JCR_END__ 15: 00000000000005b0 0 FUNC LOCAL DEFAULT 11 __do_global_ctors_aux 16: 00000000000018a0 0 OBJECT LOCAL HIDDEN 18 __dso_handle 17: 0000000000000597 11 FUNC LOCAL HIDDEN 11 bar() 18: 00000000000018c0 0 OBJECT LOCAL HIDDEN 20 __DTOR_END__ 19: 0000000000001670 496 OBJECT LOCAL HIDDEN 15 _DYNAMIC 20: 0000000000001878 40 OBJECT LOCAL HIDDEN 17 _GLOBAL_OFFSET_TABLE_ 22: 0000000000000478 0 FUNC GLOBAL DEFAULT 9 _init 23: 00000000000005e8 0 FUNC GLOBAL DEFAULT 12 _fini 26: 000000000000058c 11 FUNC GLOBAL DEFAULT 11 foo() 28: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS _edata 29: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS __bss_start 30: 00000000000018e0 0 NOTYPE GLOBAL DEFAULT ABS _end [vinavx0] ~/public/ctest $ g++ -fPIC vislto.cc -Wall -shared -o libvislto.so -flto [vinavx0] ~/public/ctest $ readelf -sW libvislto.so | grep -v UND | sed 's/\./ \./g' | c++filt Symbol table ' .dynsym' contains 11 entries: Num: Value Size Type Bind Vis Ndx Name 2: 0000000000000478 0 FUNC GLOBAL DEFAULT 9 _init 3: 00000000000005e8 0 FUNC GLOBAL DEFAULT 12 _fini 6: 000000000000058c 11 FUNC GLOBAL DEFAULT 11 foo() 8: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS _edata 9: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS __bss_start 10: 00000000000018e0 0 NOTYPE GLOBAL DEFAULT ABS _end Symbol table ' .symtab' contains 31 entries: Num: Value Size Type Bind Vis Ndx Name 1: 00000000000004c0 0 FUNC LOCAL DEFAULT 11 call_gmon_start 2: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff .c 3: 00000000000018a8 0 OBJECT LOCAL DEFAULT 19 __CTOR_LIST__ 4: 00000000000018b8 0 OBJECT LOCAL DEFAULT 20 __DTOR_LIST__ 5: 00000000000018c8 0 OBJECT LOCAL DEFAULT 21 __JCR_LIST__ 6: 00000000000004e0 0 FUNC LOCAL DEFAULT 11 __do_global_dtors_aux 7: 00000000000018d0 1 OBJECT LOCAL DEFAULT 22 completed .5901 8: 00000000000018d8 8 OBJECT LOCAL DEFAULT 22 dtor_idx .5903 9: 0000000000000560 0 FUNC LOCAL DEFAULT 11 frame_dummy 10: 0000000000000000 0 FILE LOCAL DEFAULT ABS cclww4iv .ltrans0 .o 11: 0000000000000597 11 FUNC LOCAL DEFAULT 11 bar() .2238 12: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff .c 13: 00000000000018b0 0 OBJECT LOCAL DEFAULT 19 __CTOR_END__ 14: 0000000000000650 0 OBJECT LOCAL DEFAULT 13 __FRAME_END__ 15: 00000000000018c8 0 OBJECT LOCAL DEFAULT 21 __JCR_END__ 16: 00000000000005b0 0 FUNC LOCAL DEFAULT 11 __do_global_ctors_aux 17: 00000000000018a0 0 OBJECT LOCAL HIDDEN 18 __dso_handle 18: 00000000000018c0 0 OBJECT LOCAL HIDDEN 20 __DTOR_END__ 19: 0000000000001670 496 OBJECT LOCAL HIDDEN 15 _DYNAMIC 20: 0000000000001878 40 OBJECT LOCAL HIDDEN 17 _GLOBAL_OFFSET_TABLE_ 22: 0000000000000478 0 FUNC GLOBAL DEFAULT 9 _init 23: 00000000000005e8 0 FUNC GLOBAL DEFAULT 12 _fini 26: 000000000000058c 11 FUNC GLOBAL DEFAULT 11 foo() 28: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS _edata 29: 00000000000018d0 0 NOTYPE GLOBAL DEFAULT ABS __bss_start 30: 00000000000018e0 0 NOTYPE GLOBAL DEFAULT ABS _end