MySql UDF using shared library won't load

Posted by Jarrod on Stack Overflow See other posts from Stack Overflow or by Jarrod
Published on 2010-06-01T16:20:58Z Indexed on 2010/06/01 16:23 UTC
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Filed under:

c++

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mysql

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linux

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gcc

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udf

I am attempting to create a mysql UDF which will match a fingerprint using Digital Persona's free linux SDK library. I have written a trivial UDF as a learning experience which worked fine. However, when I added a dependency to Digital Persona's shared object I can no longer get MySql to load my UDF.

I added includes to DP's headers and compiled my UDF using:

gcc -fPIC -Wall -I/usr/src/mysql-5.0.45-linux-i686-icc-glibc23/include -shared -o dp_udf.so dp_udf.cc

I also tried adding the -static argument, but whenever I restart MySql, I get the error:

Can't open shared library 'dp_udf.so' (errno: 0 /usr/local/mysql/lib/plugin/dp_udf.so: undefined symbol: MC_verifyFeaturesEx)

MC_verifyFeaturesEx is a function defined "dpMatch.h" which I included, and is implemented in libdpfpapi.so which I have tried placing in the same location as my dp_udf.so and in /usr/lib.

Am I doing something wrong with my call to gcc (my C++ skills are rusty) or does MySql not allow UDFs to use additional shared objects?

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