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[Bug middle-end/20218] Can't use __attribute__ ((visibility ("hidden"))) to hide a symbol


------- Comment #32 from hjl at lucon dot org  2006-12-05 23:33 -------
(In reply to comment #31)
> (In reply to comment #27)
> > (In reply to comment #26)
> > > Created an attachment (id=12714)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12714&action=view) [edit]
> > > main_skel.o
> > > 
> > 
> > It looks OK. Please provide a complete testcase. It could be a gcc bug,
> > a linker bug and/or a problem on your system.
> 
> 
> http://minus.ds14.agh.edu.pl/~pluto/bug.tar.bz2
> 
> $ g++ -shared main.o main_skel.o ./libqt-mt.so.3.3.7
> /usr/bin/ld: main_skel.o: relocation R_X86_64_PC32 against `_ZTV9QMemArrayIcE'
> can not be used when making a shared object; recompile with -fPIC
> /usr/bin/ld: final link failed: Bad value
> collect2: ld returned 1 exit status
> 
> gcc-4.2.0-0.20061119r118994.1.x86_64
> binutils-2.17.50.0.8-1.x86_64
> 
[hjl@gnu-2 bug]$ ld -shared main.o main_skel.o 
ld: main_skel.o: relocation R_X86_64_PC32 against `_ZTV9QMemArrayIcE' can not
be used when making a shared object; recompile with -fPIC
ld: final link failed: Bad value
[hjl@gnu-2 bug]$ readelf -a main.o | grep _ZTV9QMemArrayIcE
COMDAT group section [   35] `.group' [_ZTV9QMemArrayIcE] contains 1 sections:
   [  114]   .data.rel.ro._ZTV9QMemArrayIcE
00000000083e  00c300000009 R_X86_64_GOTPCREL 0000000000000000 _ZTV9QMemArrayIcE
+ fffffffffffffffc
000000000003  00c300000009 R_X86_64_GOTPCREL 0000000000000000 _ZTV9QMemArrayIcE
+ fffffffffffffffc
000000000003  00c300000009 R_X86_64_GOTPCREL 0000000000000000 _ZTV9QMemArrayIcE
+ fffffffffffffffc
Relocation section '.rela.data.rel.ro._ZTV9QMemArrayIcE' at offset 0xe75c8
contains 6 entries:
   195: 0000000000000000    56 OBJECT  WEAK   DEFAULT  114 _ZTV9QMemArrayIcE
[hjl@gnu-2 bug]$ readelf -a main_skel.o | grep _ZTV9QMemArrayIcE
  [11] _ZTV9QMemArrayIcE GROUP            0000000000000000  00000090
COMDAT group section [   11] `_ZTV9QMemArrayIcE' [_ZTV9QMemArrayIcE] contains 1
sections:
   [   40]   .data.rel.ro._ZTV9QMemArrayIcE
000000000179  002c00000002 R_X86_64_PC32     0000000000000000 _ZTV9QMemArrayIcE
+ c
000000000195  002c00000002 R_X86_64_PC32     0000000000000000 _ZTV9QMemArrayIcE
+ c
000000000003  002c00000002 R_X86_64_PC32     0000000000000000 _ZTV9QMemArrayIcE
+ c
000000000003  002c00000002 R_X86_64_PC32     0000000000000000 _ZTV9QMemArrayIcE
+ c
Relocation section '.rela.data.rel.ro._ZTV9QMemArrayIcE' at offset 0x2dd0
contains 6 entries:
    44: 0000000000000000    56 OBJECT  WEAK   HIDDEN   40 _ZTV9QMemArrayIcE
[hjl@gnu-2 bug]$ ld -shared main_skel.o main.o
[hjl@gnu-2 bug]$ 

The hidden definition in main_skel.o is ignored due to COMDAT group.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20218
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