soname creation

shamjs · 12-19-2011, 12:09 AM

Hi all,
i need to create shared library for my project

these is my directory structure.
home/shamjs/source->mainpgm
home/shamjs/source/inc->pgm1.h,pgm2.h,pgm3.h,pgm4.h,pgm5.h,....8.h
home/shamjs/source/src->
pgm1.cpp,pgm2.cpp,pgm3.cpp,pgm4.cpp,pgm5.cpp,....8.cpp

im following this steps to create .so file

1>make

2>ld -shared -soname MyLib.so.1 -o MyLib.so.1.0 -lc pgm1.o pgm2.o pgm3.o pgm4.o gpm5.o pgm6.o pgm7.o pgm8.o

after executing this step real name will be created MyLib.so.1.0

3>export LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH

4>/sbin/ldconfig -v -n .

after executing this i get
.:

but i wont get MyLib.so.1 -> MyLib.so.1.0.1 (changed)
the above output and no soname will be created....

5>ln -sf MyLib.so.1 MyLib.so

after executing this i get MyLib.so(linker name gets created)

my problem is, since the soname is not being created (MyLib.so.1) hence, im unable to execute my program ,by only using MyLib.so.1.o or MyLib.so files

please suggest me what can be done........

waiting for your reply........

NevemTeve · 12-19-2011, 02:53 AM

That's what libtool is good for. It's something like this:

Code:

mkdir ~/lib

libtool --mode=compile g++ -o pgm1.lo -c pgm1.cc
...
libtool --mode=compile g++ -o pgm8.lo -c pgm8.cc

libtool --mode=link g++ -o libmylib.la -rpath ~/lib -version-info 1:0:0 pgm*.o
libtool --mode=install cp libmylib.la ~/lib

shamjs · 12-19-2011, 03:42 AM

Quote:

Originally Posted by NevemTeve

libtool --mode=link g++ -o libmylib.la -rpath ~/lib -version-info 1:0:0 pgm*.o
libtool --mode=install cp libmylib.la ~/lib
[/code]

but i need to create a dynamic library instead of static one..........

plz suggest me for this...........

NevemTeve · 12-19-2011, 04:35 AM

> but i need to create a dynamic library instead of static one..........

Relax, libtool does generate both. (Unless you omit the "-rapth ~/lib" part).

PS: Well, here is a correction:

Code:

libtool --mode=link g++ -o libmylib.la -rpath ~/lib -version-info 1:0:0 pgm*.lo

Reuti · 12-20-2011, 06:24 AM

Besides NevemTeve way: I think in the origin there was one entry too much: you had MyLib.so.1, MyLib.so.1.0 and were looking for MyLib.so.1.0.1 and MyLib.so . Usually there are only three like:

MyLib.so -> MyLib.so.1.0
MyLib.so.1.0 -> MyLib.so.1.0.1
MyLib.so.1.0.1

with -soname MyLib.so.1.0 and output MyLib.so.1.0.1 , it should work to create the missing links by hand (no ldconfig at all). There is a document from IBM.