Re: Dynamic Linking Library Problem Using GCC

[Olivier Rochecouste <olivier dot rochecouste at irisa dot fr>]

Hi Cheok,

I'm not an expert but I think you should make a symlink to your shared library:

"ln -s libmean.so.1.0.1 libmean.so"

ld should be able to find the .so now

--
Olivier

> Hi,
> 
> I read through the tutorial
> http://www.adp-gmbh.ch/cpp/gcc/create_lib.html in
> buidling dynamic library using gcc. It is interesting.
> However, after following the steps inside the
> tutorial, it doesn't work in my system.
> 
> Here is the sequence of steps which I had performed:
> 
> [yccheok@localhost project]$ ls -al
> total 28
> drwxrwxr-x   2 yccheok yccheok  4096 Dec 13 01:16 .
> drwx------  65 yccheok yccheok 12288 Dec 13 00:58 ..
> -rw-rw-r--   1 yccheok yccheok    56 Dec 13 00:48
> calc_mean.c
> -rw-rw-r--   1 yccheok yccheok    29 Dec 13 00:48
> calc_mean.h
> -rw-rw-r--   1 yccheok yccheok   224 Dec 13 00:49
> main.c
> [yccheok@localhost project]$ gcc -c -fPIC calc_mean.c
> -o calc_mean.o
> [yccheok@localhost project]$ gcc -shared
> -Wl,-soname,libmean.so.1 -o
> libmean.so.1.0.1  calc_mean.o
> [yccheok@localhost project]$ gcc main.c -o
> dynamically_linked -L. -lmean
> /usr/bin/ld: cannot find -lmean
> collect2: ld returned 1 exit status
> [yccheok@localhost project]$ ls -al
> total 40
> drwxrwxr-x   2 yccheok yccheok  4096 Dec 13 01:17 .
> drwx------  65 yccheok yccheok 12288 Dec 13 00:58 ..
> -rw-rw-r--   1 yccheok yccheok    56 Dec 13 00:48
> calc_mean.c
> -rw-rw-r--   1 yccheok yccheok    29 Dec 13 00:48
> calc_mean.h
> -rw-rw-r--   1 yccheok yccheok   908 Dec 13 01:16
> calc_mean.o
> -rwxrwxr-x   1 yccheok yccheok  4349 Dec 13 01:16
> libmean.so.1.0.1
> -rw-rw-r--   1 yccheok yccheok   224 Dec 13 00:49
> main.c
> [yccheok@localhost project]$
> 
> Can you please advice on why the ld cannot find the
> mean library. Do I need to prior perform anything with
> ldconfig before i dynamic linked my main application
> with the mean library?
> 
> Thank you!
> 
> -cheok
> 
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