Re: Shared Libary Issue - cannot find library

[universaltoaster <stokish at umich dot edu>]

Jonathan Wakely-4 wrote:
> 
> On 19 February 2012 15:57, universaltoaster wrote:
>>
>> I'm having issues building and linking a library that I created to
>> another
>> executable. ÂBelow are the steps that I followed. ÂNOTE: ÂI'm building
>> this
>> project on my computer (Ubuntu Karmic Koala) and then putting it on to an
>> embedded arm device running busyBox linux.
>>
>> Here's the steps that I've gone through that lead me to a dreaded "cannot
>> find MYLIB.so" when I try and run the application on the embedded device
>>
>> 1: arm-linux-gcc -Wall -fPIC -c MYLIB.c -O3 --sysroot home06
>> 2: arm-linux-gcc -Wall -shared -Wl,-soname,libMYLIB.so.1 -o
>> libMYLIB.so.1.0
>> MYLIB.o -O3 --sysroot home06
>> 3: ln -sf libMYLIB.so.1.0 libMYLIB.so //symbolic link for -lMYLIB
>> 4: ln -sf libMYLIB.so.1.0 libMYLIB.so.1 //allows for runtime binding to
>> work
>> 5: arm-linux-gcc -lTXRX -lm -lMYLIB COMM.c -O3 --sysroot home06 -o
>> RUNONBOX
> 
> How is this finding libMYLIB.so? I would expect it to need -L. or
> equivalent.
> 
> Is it finding a different libMYLIB.so in another directory?
> 
>> 6: ldd RUNONBOX
>>>> not a dynamic executable //this doesn't seem good...no reference to
>>>> MYLIB... ÂNOTE: I've built this program with -lTXRX and -lm many times
>>>> before with ZERO issues
>>
>> 7: mput *.so* //put all symbolic links on device NOTE: folder is /tmp/cf
>> 8: put RUNONBOX //put executable on device NOTE: folder is /tmp/cf
>> 9: export LD_LIBRARY_PATH=/tmp/cf/:$LD_LIBRARY_PATH
>> 9: ./RUNONBOX
>>>> can't load library 'libMYLIB.so'
> 
> I don't know busybox but I would expect it to be looking for
> libMYLIB.so.1 if it was linked against the library you built with that
> soname.
> 
>> The questions that I have are
>> A: Why won't my library be loaded even though I've set the
>> LD_LIBRARY_PATH
>> to look in the directory with libMYLIB.so?
>> B: How do I have 2 other libraries that are linked to this program that
>> do
>> not show dependencies when I run 'ldd'?
> 
> Does ldd only support native executables, not the arm ones?
> 
> 

I had to move the symbolic links and the shared object to another folder in
my build path and it worked fine.  NOTE: tried -L option before with no
luck.  Not sure about ldd and arm executables, if I find out I'll let you
know.
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