FreeTDS Development Group

["James K. Lowden" <jklowden AT schemamania.org>]

James McGowan wrote:
> I've installed sqsh version .. on a Redhat 9 system with Sybase ASE
> 10.0.0 and I get this message when I attempt to execute it:
>  
>       /usr/local/bin/sqsh.bin: error while loading shared libraries:
> libct.so.0: cannot open shared object file: No such file or directory

The problem is that your run-time linker isn't looking where libct.so.0 is
to be found.  Other libraries might also be affected (but probably not). 
You can check with:

$ ldd $(command -v sqsh)
/usr/local/bin/sqsh:
         -lc.12 => /usr/lib/libc.so.12
         -lct.3 => /usr/local/lib/libct.so.3
         -ltds.5 => /usr/local/lib/libtds.so.5
         -lm.0 => /usr/lib/libm387.so.0
         -lm.0 => /usr/lib/libm.so.0
         -lcrypt.0 => /usr/lib/libcrypt.so.0
         -lreadline.5 => /usr/pkg/lib/libreadline.so.5
         -lcurses.6 => /usr/lib/libcurses.so.6

As you can see, the run-time linker on my system collects shared objects
from three places.  By default (on my system) it looks only in /usr/lib. 
Yours should show a "not found" or two.  

To tell it where to look, you can tell it where such files might generally
be found, or where this one may be found for sqsh.  I prefer the latter
option.  To affect your run-time linker generally, consult your man pages
for ld.so or perhaps ld.elf_so.  LD_LIBRARY_PATH is a popular knob.  

The latter choice involves changing the RPATH in the sqsh ELF binary.  If
you're compiling & linking with gcc, you can pass the linker options with
'-Wl'.  I did it by modifying src/Makefile in the sqsh tree, changing:

        SYBASE_LIBDIR = -L$(SYBASE_OCOS)/lib

to

        SYBASE_LIBDIR = -Wl,-R/usr/pkg/lib \
                        -Wl,-R/usr/local/lib \
                        -L$(SYBASE_OCOS)/lib

>From the root of the sqsh tree, change src/Makefile as above (substituting
your system's path to libct.so.0, of course), then:

        $ rm src/sqsh; make 

You should see your '-Wl' arguments pop up there.  To check your work:

$ readelf -d $(command -v sqsh) | sed -ne1,/RPATH/p

Dynamic segment at offset 0x286a4 contains 24 entries:
  Tag        Type       Name/Value
 0x00000001 (NEEDED)   Shared library: [libct.so.3]
 0x00000001 (NEEDED)   Shared library: [libtds.so.5]
 0x00000001 (NEEDED)   Shared library: [libm.so.0]
 0x00000001 (NEEDED)   Shared library: [libcrypt.so.0]
 0x00000001 (NEEDED)   Shared library: [libreadline.so.5]
 0x00000001 (NEEDED)   Shared library: [libcurses.so.6]
 0x00000001 (NEEDED)   Shared library: [libc.so.12]
 0x0000000f (RPATH)    Library rpath: [/usr/pkg/lib:/usr/local/lib]

For more, cf.:

$ info -f gcc --index='Wl'
$ info -f ld  --index='-R FILE'

Isn't consistency wonderful?  

HTH.

--jkl