Re: [jamboost] libstdc++.so.6: cannot open shared object file

From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-09-04 04:04:51

Hi Larry,
> I'm getting the subject line error with g++. Could someone
> explain how to avoid this? AFAICT, the relevant directories
> and their contents are:
>
> /usr/lib/libstdc++.so doesn't exist.
> /usr/lib/libstdc++.so.6 doesn't exist.
> /usr/local/lib/libstdc++.so -> /usr/local/lib/libstdc++.so.6.0.0
> /usr/local/lib/libstdc++.so.6 -> /usr/local/lib/libstdc++.so.6.0.0
>
> permissions on the library are:
>
> -rwxr-xr-x ... libstdc++.so.6.0.0
>
> However, in ~/user-config.jam, there's:
>
> using gcc : : "/usr/local/gcc-3.4.1/bin/g++" ;
>
> and in /usr/local/gcc-3.4.1/lib, there's:
>
> libstdc++.so.6 -> libstdc++.so.6.0.1
> -rwxr-xr-x ... libstdc++.so.6.0.1
>
> Since all the existing so.6 files are "read-all", I don't understand
> why bjam --v2 gives me the above errors. The link command printed
> when bjam --v2 -d4 was run gave:
>
> "/usr/local/gcc-3.4.1/bin/g++" -g -o
> "../../../../bin.v2/lje/libs/managed_ptr/test/cycle_basis_mgr.test/gcc/debu
>g/cycle_basis_mgr"
>
> "../../../../bin.v2/lje/libs/managed_ptr/test/cycle_basis_mgr.test/gcc/debu
>g/cycle_basis_mgr.o"
> "../../../../bin.v2/lje/libs/managed_ptr/test/cycle_basis_mgr.test/gcc/debu
>g/mout.o"

Did you try to run this command by hand? Is the error is still there, then the 
problem is in your installation (from the path, I presume you've installed 
this gcc yourself).

I don't have any specific ideas. What you can do, however, is run add "-v" 
option to gcc. It will print the linker invocation command. After that, you 
can run

strace -o log -f <linker-invocation-command>

the 'log' file will contain all the system calls made by the linker frontend 
('collect2') and the linker itself. Look for libstdc++ in those outputs. If 
the linker never tries to open /usr/local/lib/libstdc++.so, then maybe it 
does not know that it should look in /usr/local/lib and tweaking some env 
vars (e.g. LIBRARY_PATH) is needed. Take a look at the linker docs to figure 
out what variables it need.

HTH,
Volodya