https://sourceware.org/bugzilla/show_bug.cgi?id=18703
--- Comment #2 from Sriraman Tallam <tmsriram at google dot com> --- On Tue, Jul 21, 2015 at 11:03 AM, ccoutant at gmail dot com <sourceware-bugzi...@sourceware.org> wrote: > https://sourceware.org/bugzilla/show_bug.cgi?id=18703 > > --- Comment #1 from Cary Coutant <ccoutant at gmail dot com> --- > You're looking at the linker symbol table with nm. (And nm does not show > versioning information from the .gnu.version* sections.) > > When I build this with gold, readelf -Vs shows: > > Symbol table '.dynsym' contains 13 entries: > Num: Value Size Type Bind Vis Ndx Name > 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND > 1: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__ > 2: 0000000000000000 0 NOTYPE WEAK DEFAULT UND > _ITM_deregisterTMCloneTab > 3: 0000000000000000 0 FUNC WEAK DEFAULT UND > __cxa_finalize@GLIBC_2.2.5 (3) > 4: 0000000000000000 0 NOTYPE WEAK DEFAULT UND > _ITM_registerTMCloneTable > 5: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses > 6: 00000000000006f5 11 FUNC GLOBAL DEFAULT 12 foo@@VERS_1.1 > 7: 0000000000002018 0 NOTYPE GLOBAL DEFAULT ABS _edata > 8: 0000000000002019 0 NOTYPE GLOBAL DEFAULT ABS _end > 9: 00000000000005c0 0 FUNC GLOBAL DEFAULT 10 _init > 10: 0000000000002018 0 NOTYPE GLOBAL DEFAULT ABS __bss_start > 11: 0000000000000700 0 FUNC GLOBAL DEFAULT 13 _fini > 12: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS VERS_1.1 > > ... > > Version symbols section '.gnu.version' contains 13 entries: > Addr: 0000000000000458 Offset: 0x000458 Link: 2 (.dynsym) > 000: 0 (*local*) 0 (*local*) 0 (*local*) 3 (GLIBC_2.2.5) > 004: 0 (*local*) 0 (*local*) 2 (VERS_1.1) 1 (*global*) > 008: 1 (*global*) 1 (*global*) 1 (*global*) 1 (*global*) > 00c: 2 (VERS_1.1) > > Version definition section '.gnu.version_d' contains 2 entries: > Addr: 0x0000000000000474 Offset: 0x000474 Link: 3 (.dynstr) 000000: Rev: > 1 > Flags: BASE Index: 1 Cnt: 1 Name: ver1.so > 0x001c: Rev: 1 Flags: none Index: 2 Cnt: 1 Name: VERS_1.1 > > Version needs section '.gnu.version_r' contains 1 entries: > Addr: 0x00000000000004ac Offset: 0x0004ac Link: 3 (.dynstr) > 000000: Version: 1 File: libc.so.6 Cnt: 1 > 0x0010: Name: GLIBC_2.2.5 Flags: none Version: 3 > > I think this is working as intended, although comparing with Gnu ld output, I > see that gold defines it as a default version ("@@") where Gnu ld does not. > I'm > not sure what the logic ought to be for that. Without the __asm__ in the .c > file, Gnu ld also makes it a default version. Some context: https://gcc.gnu.org/ml/gcc-patches/2015-04/msg00878.html This was used to hide symbols __cpu_indicator_init and __cpu_model defined in libgcc_s.so so that this symbol is always obtained from libgcc.a. Now, this works with GNU ld and not with gold. Isnt this an incompatibility. If this is not well defined, is there another well defined way of achieving the same result? Thanks Sri > > -- > You are receiving this mail because: > You reported the bug. -- You are receiving this mail because: You are on the CC list for the bug. _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
