Hello I am getting this error when I am doing the make of a program

Relocation R_X86_64_32 against `vtable for Torch::MemoryDataSet' can not be used when making a shared object; recompile with -fPIC

It says that I should recompile with the -fPIC option, but I already have the -fPIC option in the CFLAGS and CXXFLAGS of the make file, is there any way to solve this?. I have seen that this problem is related with the use of a 64 bits machine, and it is true because I am using one.

Thanks.

It's always better to post the last 20-30 lines of the failed make which will include the actual error message. Are you sure all of the Makefiles in the source tree contain -fPIC? Are you sure it's not complaining about a 32-bit dependency that whatever app (something else that might be helpful) you're trying to build is attempting to link against?

Thanks for your answer, this is the complete error message,
/usr/bin/ld: /home/olmedo/RL_Toolbox/external_libs/torch3/lib/Linux_OPT_DOUBLE/libtorch.a(MemoryDataSet.o): relocation R_X86_64_32 against `vtable for Torch::MemoryDataSet' can not be used when making a shared object; recompile with -fPIC
/home/olmedo/RL_Toolbox/external_libs/torch3/lib/Linux_OPT_DOUBLE/libtorch.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [../lib/librltoolbox.so.1.0.0] Error 1

Libtorch.a is a file from an external library, is maybe the cause of the problem the other library?. I think that all my makefiles have the -fPIC option, I have only one makefile in the directory , so I think that that is the only one that is being in used.

Thanks.

Well, 5 lines of output is almost 20-30. It's helpful to see what the compiler or linker was trying to do when it failed. Anyway, if libtorch is a dependency lib for RL_Toolbox, then you need a 64-bit copy of libtorch compiled with -fPIC.

Thank for the answer, here you have the rest of the lines:

makedepend: warning: ckdtrees.cpp, line 5: cannot find include file "iostream"
not in /usr/lib64/qt-3.3/mkspecs/default/iostream
not in ./iostream
not in ../external_libs/torch3/include/iostream
not in ../external_libs/newmat11/iostream
not in ../include/iostream
not in /usr/include/iostream
test -d ../lib/ || mkdir -p ../lib/
rm -f librltoolbox.so.1.0.0 librltoolbox.so librltoolbox.so.1 librltoolbox.so.1.0
g++ -shared -Wl,-soname,librltoolbox.so.1 -o librltoolbox.so.1.0.0 cacrobotmodel.o caction.o cactionstatistics.o cactorcritic.o cadaptivesoftmaxnetwork.o cadvantagelearning.o cagentcontroller.o cagent.o cagentlistener.o cagentlogger.o canalyzer.o ccartpolemodel.o ccontinuousactiongradientpolicy.o ccontinuousactions.o ccontinuoustime.o cdiscretizer.o cdynamicprogramming.o cenvironmentmodel.o cepisode.o cepisodehistory.o cerrorlistener.o cexploration.o cfeaturefunction.o cgradientfunction.o cgridworldmodel.o chierarchicbehaviours.o chierarchiccontroller.o chistory.o clearndataobject.o clinearfafeaturecalculator.o cmontecarlo.o cmultipolemodel.o cmyexception.o cparameters.o cpegasus.o cpendulummodel.o cpolicies.o cpolicygradient.o cprioritizedsweeping.o cqetraces.o cqfunction.o cregions.o creinforce.o cresiduals.o crewardfunction.o crewardmodel.o cstatecollection.o cstate.o cstatemodifier.o cstateproperties.o csupervisedlearner.o ctaxidomain.o ctdlearner.o ctestsuit.o ctheoreticalmodel.o ctorchvfunction.o ctransitionfunction.o cutility.o cvaluepolicygradientlearner.o cvetraces.o cvfunction.o cvfunctionfromqfunction.o cvfunctionlearner.o ril_debug.o cbatchlearning.o clstd.o cdatafactory.o cextratrees.o cforest.o cinputdata.o ctrees.o ctreevfunction.o ctreebatchlearning.o crbftrees.o cnearestneighbor.o ckdtrees.o clocalregression.o cmodeltree.o csamplingbasedmodel.o cbaseobjects.o cevaluator.o -ltorch -L/home/olmedo/RL_Toolbox/external_libs/torch3/lib/Linux_OPT_DOUBLE -lnewmat -L/home/olmedo/RL_Toolbox/external_libs/newmat11/lib
/usr/bin/ld:

/home/olmedo/RL_Toolbox/external_libs/torch3/lib/Linux_OPT_DOUBLE/libtorch.a(MemoryDataSet.o): relocation R_X86_64_32 against `vtable for Torch::MemoryDataSet' can not be used when making a shared object; recompile with -fPIC
/home/olmedo/RL_Toolbox/external_libs/torch3/lib/Linux_OPT_DOUBLE/libtorch.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [../lib/librltoolbox.so.1.0.0] Error 1



Thanks.