On Sat, 18 Jul 2009, Nicola Maggi wrote: <snip>
About all I can suggest is adding -fPIC to the compilation of the .cc and the the link line - you didn't specify how that was being compiled...If you mean how do I compile my shared library sources here is an excerpt from Makefile: ______________________________ libReadoutModuleRAPS.so : okFrontPanelDLL.o raps.o DataChannelRAPS.o ReadoutModuleRAPS.o g++ -shared -fpic -LlibokFrontPanel.so -lROSCore -lers -lDFDebug ${LIBDIR} ${LIBS} -o libReadoutModuleRAPS.so okFrontPanelDLL.o ReadoutModuleRAPS.o DataChannelRAPS.o raps.o ReadoutModuleRAPS.o : ReadoutModuleRAPS.cpp ${CC} ${INCLUDES} -c -DLINUX -DDEBUG_LEVEL=3 $< DataChannelRAPS.o : DataChannelRAPS.cpp ${CC} ${INCLUDES} -c -DLINUX -DDEBUG_LEVEL=3 DataChannelRAPS.cpp raps.o: raps.cpp g++ ${INCLUDES} -DDEBUG_LEVEL=3 -DLINUX -c $< okFrontPanelDLL.o: okFrontPanelDLL.cpp g++ -fPIC -DLINUX -c $< ______________________________ Just ignore all the -l switches becouse those are other libraries which works just fine.. the only important one is -LlibokFrontPanel.so which calls the FPGA shared library. As you can see I'm already using -fPIC to compile the cpp library wrapper but I don't really know if I should use it to compile the other files too.
Actually you are using -fpic on the line which links/creates the shared library, but are not specifying pic for _compiling_ all the code which is going into it.
ie try adding -fPIC to the lines which generate ReadoutModuleRAPS.o, DataChannelRAPS.o and raps.o - since they need to be pic as well since they are going into the final .so file (as well as okFrontPanelDLL.o which is being compiled -fPIC).
BTW while on many system -fpic and -fPIC generate the same code you should be consistent and pick one - at the moment you have both -fpic and -fPIC which may clash.
-- Jon
