Error while LoadLibrary a c-shared .so in CentOS

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Varun Pai
Varun Pai on 21 May 2019
Edited: Varun Pai on 21 May 2019
I have created a C application and built it as a C-Shared library .so. The C application contains reference to ZMQ library. To generate the shared library I tried following steps:
1) I wrote a C application ZMQInterface.c with a header file ZMQInterface.h
2) Built the application as C-shared library
[varun@localhost zmqproj]$ gcc -c -Wall -Werror -I/usr/local/include/ -L/usr/local/lib -lzmq -fpic ZMQInterface.c
[varun@localhost zmqproj]$ gcc -shared -o ZMQInterface.so ZMQInterface.o
The shared library ZMQInterface.so was generated successfully
When I tried to load it in MATLAB using loadlibrary() I am getting the following error. I have attached the files (zmqproj.zip)
>> [status,warn] = loadlibrary('ZMQInterface.so','ZMQInterface.h');
Error loading library intermediate output follows.
The actual error is at the end of this output.
*********
Type '' was not found. Defaulting to type error.
Found on line 11 of input from line 5 of file /home/varun/zmqproj/ZMQInterface.h
Type 'char(visibility("default")))Ptrs_recv(voidPtr' was not found. Defaulting to type voidPtr.
Found on line 11 of input from line 5 of file /home/varun/zmqproj/ZMQInterface.h
Type '' was not found. Defaulting to type error.
Found on line 12 of input from line 6 of file /home/varun/zmqproj/ZMQInterface.h
Failed to parse type '( visibility (" default "))) void * create_socket_context ( void' original input '( visibility (" default "))) void * create_socket_context ( void '
Found on line 12 of input from line 6 of file /home/varun/zmqproj/ZMQInterface.h
Error parsing argument for function __attribute__ function may be invalid.
Type '' was not found. Defaulting to type error.
Found on line 13 of input from line 7 of file /home/varun/zmqproj/ZMQInterface.h
Type 'int(visibility("default")))voidPtrcreate_socket_subscriber(voidPtr' was not found. Defaulting to type voidPtr.
Found on line 13 of input from line 7 of file /home/varun/zmqproj/ZMQInterface.h
*********
Error using loadlibrary
Building ZMQInterface_thunk_glnxa64 failed. Compiler output is:
/usr/bin/gcc -I"/usr/local/MATLAB/R2017a/extern/include" -fexceptions -fPIC -fno-omit-frame-pointer -pthread -I"/home/varun/zmqproj"
-I"/home/varun/zmqproj" "ZMQInterface_thunk_glnxa64.c" -o "ZMQInterface_thunk_glnxa64.so" -Wl,-E -shared
ZMQInterface_thunk_glnxa64.c: In function voidPtrThunk:
ZMQInterface_thunk_glnxa64.c:38:14: error: expected expression before ‘)’ token
return (( (*)(void * ))fcn)(p0);
^
ZMQInterface_thunk_glnxa64.c:38:25: error: expected )before ‘fcn’
return (( (*)(void * ))fcn)(p0);
^
ZMQInterface_thunk_glnxa64.c: At top level:
ZMQInterface_thunk_glnxa64.c:42:30: error: expected declaration specifiers or ‘...’ before string constant
EXPORT_EXTERN_C (visibility("default")))void*create_socket_context(voidThunk(void fcn(),const char *callstack,int stacksize)
^
Try 2 :
Then I tried removing the __attribute__ ((visibility ("default"))) then compiled and loaded. But I am getting following error then
Error using loadlibrary
There was an error loading the library "/home/varun/zmqproj/ZMQInterface.so"
Missing symbol 'zmq_connect' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_ctx_new' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_recv' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_send' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_socket' required by '/home/varun/zmqproj/ZMQInterface.so'
Caused by:
Error using loaddefinedlibrary
Missing symbol 'zmq_connect' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_ctx_new' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_recv' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_send' required by '/home/varun/zmqproj/ZMQInterface.so'
Missing symbol 'zmq_socket' required by '/home/varun/zmqproj/ZMQInterface.so'
Could any one help me to know the actual cause for this issue ?
Execution Environment :
OS - CentOS 7 64 bit
gcc version - gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36)
MATLAB 2017a

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