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

[Syed Ahsan Ali Bokhari <ahsan dot pmd at gmail dot com>]

Dear Jonathan

For the sake of building static libraries I tried to configure with
option --disable-shared. But that was not successful. And now even the
previous build is not working. I have cleaned the source directory
again and tried a new configure without any flag. But it is giving
following error

here=`pwd`; cd /home/pmdtest/gcc-4.6.1/libjava/classpath/lib; \
        find gnu java javax org sun -name .svn -prune -o -name
'*.class' -print | \
        gjar -cfM@ $here/libgcj-4.6.1.jar
Exception in thread "main" java.lang.ExceptionInInitializerError
*** Got java.lang.NullPointerException while trying to print stack trace.
make[5]: *** [libgcj-4.6.1.jar] Error 1
make[5]: Leaving directory
`/home/pmdtest/objdir/x86_64-unknown-linux-gnu/32/libjava'
make[4]: *** [all-recursive] Error 1
make[4]: Leaving directory
`/home/pmdtest/objdir/x86_64-unknown-linux-gnu/32/libjava'
make[3]: *** [multi-do] Error 1
make[3]: Leaving directory
`/home/pmdtest/objdir/x86_64-unknown-linux-gnu/libjava'
make[2]: *** [all-multi] Error 2
make[2]: Leaving directory
`/home/pmdtest/objdir/x86_64-unknown-linux-gnu/libjava'
make[1]: *** [all-target-libjava] Error 2
make[1]: Leaving directory `/home/pmdtest/objdir'
make: *** [all] Error 2

Regards


On Wed, Jun 20, 2012 at 4:50 PM, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> 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.