error while loading shared libraries: libgfortran.so.3: wrong ELF class: ELFCLASS32

[Jonathan Wakely]

On 20 June 2012 11:53, Syed Ahsan Ali Bokhari <ahsan.pmd@gmail.com> wrote:
> The page says that
> At runtime set LD_LIBRARY_PATH in your environment correctly, so that
> the shared library for libstdc++ can be found and loaded. Be certain
> that you understand all of the other implications and behavior of
> LD_LIBRARY_PATH first.
>
> I have set LD_LIBRARY_PATH already in bashrc.  Does it serves the purpose?

It depends what you've set it to and whether you've exported it.

If you've set it to destdir/lib that would explain the error, you
probably need it to be destdir/lib64


> Compile the path to find the library at runtime into the program. This
> can be done by passing certain options to g++, which will in turn pass
> them on to the linker. The exact format of the options is dependent on
> which linker you use:
>
> GNU ld (default on GNU/Linux): -Wl,-rpath,destdir/lib
>
> I can't understand this option. Can you explain a little please

Read the manuals.

-Wl, tells GCC to pass the following options to the linker, replacing
commas with spaces.

-rpath destdir/lib tells the linker to add a RT_RPATH or DT_RUNPATH
entry with the contents destdir/lib, you should replace "destdir/lib"
with the location of the shared library the executable needs.