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default linker for shared libraries, need some comments
- From: Yaroslav Popovitch <yp at sot dot com>
- To: libc-alpha at sources dot redhat dot com
- Date: Thu, 24 Apr 2003 23:31:57 +0300 (EEST)
- Subject: default linker for shared libraries, need some comments
Hi! I had some problems with setting default linker for shared libraries.
They are always linked against ld-linux.so.2. Option --dynamic-linker
works only for usual programs.
For example:
ldd -v libhistory.so.4.1
libc.so.6 => /lib/libc.so.6 (0x4000c000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
Version information:
./libhistory.so.4.1:
libc.so.6 (GLIBC_2.0) => /lib/libc.so.6
/lib/libc.so.6:
ld-linux.so.2 (GLIBC_2.1) => /lib/ld-linux.so.2
ld-linux.so.2 (GLIBC_2.0) => /lib/ld-linux.so.2
ld-linux.so.2 (GLIBC_PRIVATE) => /lib/ld-linux.so.2
It seems that ld-linux.so.2 dependency is provided by libc.so.6 library.
Also I found that .interp section is not present for most libraries. Is it
mean that I cannot set directly default linker for such libraries?
objdump -s -j .interp /lib/libc-2.2.5.so
/lib/libc-2.2.5.so: file format elf32-i386
Contents of section .interp:
10dcb0 2f6c6962 2f6c642d 6c696e75 782e736f /lib/ld-linux.so
10dcc0 2e3200 .2.
1. Probably I need to change default linker for libc.so.6, isn't it? And
recompile all required libraries after that. Would I have compatiblity
problems or they can be solved by creating ld-linux.so.2 link to new
default linker?
2. Can I change default linker for libc.so.6 binary
( without recompiling ), just using something like objcopy or hex editor?.
3. How is the section SONAME related to dynamic linking ?
Cheers,YP
FYI
glibc 2.2.5
ld 2.13.90.0.4
ia32
-
Mr. Yaroslav Popovitch yp at sot dot com - tel. +372 6419975
SOT Finnish Software Engineering Ltd. - fax +372 6419975
Kreutzwaldi 7-4, 10124 TALLINN - http://www.sot.com
ESTONIA - http://sotlinux.net