Basically, as soon as you have a version script with a { local: *; } wildcard,
the symbols from other versions are *not* exported in executables built for
back-linking.
Attached is a tarball with a simple test case for the issue.
Right now running make shows the following output. The issue being obviously
that there is no `VER_2 sym_ver2` in the executable linked with a version
script using local wildcards, OTOH a shared object obviously has the expected
results.
Using explicit versioning from the C source using internal symbols (e.g.
internal_sym_ver{1,2}) with asm(".symver internal_sym_ver2,sym_ver2@@VER_2")
fails in the same way.
=====================================================
$ make
gcc -rdynamic -DMAIN -Wl,--version-script=local.ver -O2 -Wall -Wextra -o exe
test.c
gcc -rdynamic -DMAIN -Wl,--version-script=nolocal.ver -O2 -Wall -Wextra -o
exe-no test.c
gcc -shared -fPIC -Wl,--version-script=local.ver -O2 -Wall -Wextra -o
lib.so test.c
gcc -shared -fPIC -Wl,--version-script=nolocal.ver -O2 -Wall -Wextra -o
lib-no.so test.c
objdump -T exe exe-no
exe: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
0000000000000000 w D *UND* 0000000000000000 __gmon_start__
0000000000000000 DF *UND* 00000000000001c2 GLIBC_2.2.5
__libc_start_main
0000000000000000 g DO *ABS* 0000000000000000 VER_1 VER_1
0000000000000000 g DO *ABS* 0000000000000000 VER_2 VER_2
0000000000400570 g DF .text 0000000000000002 VER_1 sym_ver1
exe-no: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
0000000000000000 w D *UND* 0000000000000000 __gmon_start__
0000000000000000 DF *UND* 00000000000001c2 GLIBC_2.2.5
__libc_start_main
0000000000000000 g DO *ABS* 0000000000000000 VER_1 VER_1
0000000000000000 g DO *ABS* 0000000000000000 VER_2 VER_2
00000000004005a0 g DF .text 0000000000000002 VER_1 sym_ver1
00000000004005b0 g DF .text 0000000000000002 VER_2 sym_ver2
objdump -T lib.so lib-no.so
lib.so: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
0000000000000418 l d .init 0000000000000000 .init
0000000000000000 w D *UND* 0000000000000000 __gmon_start__
0000000000000000 w D *UND* 0000000000000000
_Jv_RegisterClasses
0000000000000000 w DF *UND* 00000000000000c5 GLIBC_2.2.5 __cxa_finalize
0000000000000000 g DO *ABS* 0000000000000000 VER_1 VER_1
0000000000000000 g DO *ABS* 0000000000000000 VER_2 VER_2
0000000000000530 g DF .text 0000000000000002 VER_1 sym_ver1
0000000000000540 g DF .text 0000000000000002 VER_2 sym_ver2
lib-no.so: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
00000000000004f0 l d .init 0000000000000000 .init
0000000000000000 w D *UND* 0000000000000000 __gmon_start__
0000000000000000 w D *UND* 0000000000000000
_Jv_RegisterClasses
0000000000000000 w DF *UND* 00000000000000c5 GLIBC_2.2.5 __cxa_finalize
0000000000200910 g D *ABS* 0000000000000000 Base _end
0000000000000000 g DO *ABS* 0000000000000000 VER_1 VER_1
0000000000200900 g D *ABS* 0000000000000000 Base _edata
0000000000000000 g DO *ABS* 0000000000000000 VER_2 VER_2
0000000000200900 g D *ABS* 0000000000000000 Base __bss_start
0000000000000610 g DF .text 0000000000000002 VER_1 sym_ver1
00000000000004f0 g DF .init 0000000000000000 Base _init
0000000000000668 g DF .fini 0000000000000000 Base _fini
0000000000000620 g DF .text 0000000000000002 VER_2 sym_ver2
=====================================================
ld --version
GNU ld (GNU Binutils for Debian) 2.18.0.20080103
--
Summary: local wildcard breaks versioning scripts for -rdynamic
executables
Product: binutils
Version: 2.18
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: madcoder at debian dot org
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=6022
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