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Compiling mex file that depends on external libraries with extension .so.n

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I have written a file myprog.cpp and is to be compiled in MATLAB. The program has external library dependencies libnewfile1.so and libnewfile2.so.3. I compiled using following instruction from MATLAB command window.
mex myprog.cpp -lnewfile1.so -lnewfile2.so.3 -L"path to library folder"
I get he following error while compiling.
Error using mex
/usr/bin/ld: cannot find -lnewfile1
/usr/bin/ld: cannot find -lnewfile2.so.3
collect2: error: ld returned 1 exit status
Could anyone please tell me how to compile a cpp file that has external library dependencies?
Later I tried adding the path to LD_LIBRARY_PATH using setenv and getenv shows the above path in LD_LIBRARY_PATH. But still I get the same error.
  3 Comments
Michael Mathew
Michael Mathew on 27 May 2016
Edited: Michael Mathew on 27 May 2016
No I still get the error:
Error using mex
/usr/bin/ld: cannot find -llibnewfile1.so
/usr/bin/ld: cannot find -llibnewfile2.so.3
collect2: error: ld returned 1 exit status
Michael Mathew
Michael Mathew on 28 May 2016
I did solve it. The problem was Matlab does not recognise libraries with extensions other than .so; Hence I renamed the library to .so and that solved the issue.

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Answers (1)

Albert Hofkamp
Albert Hofkamp on 21 Nov 2017
Bit late to the party, but the answer is that -l adds a "lib" prefix and a ".so" suffix to its argument, so linking with -Lpath/to/library/dir -lnewfile1 -lnewfile2 will do the trick.
Note that Matlab may add requirements to library-files such as position-independent code, which may or may not have been used while compiling the library.

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