C++ – Relocation R_X86_64_32S against `.rodata’ … While compiling on 64-bit platform


So I've been coding something on 32-bit and yesterday I needed to build a dll and I had a couple of problems with that. Anyway I solved them here.

Unfortunately even if I thought that everything was working after all I found that wasn't the case when I moved my program and makefile on other computer what runs on 64bit, as you can guess what happened…

So my problem is related to relocation because of 64bit

/usr/bin/ld: MyClass.o: relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC
MyClass.o: could not read symbols: Bad value

and here is my makefile

MyProgram: main.o chkopts
    -${CLINKER} -o $@ $< ${MYLIB} ${PETSC_MAT_LIB}
    ${RM} main.o


LibMyProgram.so: MyClass.o  chkopts
    -${CLINKER}  -shared -Wl,-soname,${SONAME} -o ${VERS}   *.o  ${PETSC_MAT_LIB}

    mv ${VERS} ${LIBADD}
    ln -sf ${LIBADD}${VERS} ${LIBADD}${SOWOV}
    ln -sf ${LIBADD}${VERS} ${LIBADD}${SONAME}

I've tried to add -fPIC in CFLAGS, CPPFLAGS and even LDFLAGS. I've also tried add -fPIC before and after -shared flag.

-${CLINKER} -shared -fPIC -Wl,-soname,${SONAME} -o ${VERS}   *.o  ${PETSC_MAT_LIB}

But I'll just get a same error as previously.

If I use CFLAGS = -fPIC I'll get a bit same kind of error which is:

.../petsc/petsc-3.2-p6/arch-linux2-cxx-debug/lib/libpetsc.a(err.o): relocation R_X86_64_32 against `ompi_mpi_comm_self' can not be used when making a shared object; recompile with -fPIC.

I've read about all the topics what are even remotely similar with my problem but I've been unable to figure this out.

Best Solution

I encountered the same problem when I try to create a shared library which need to link a static library.

I solved the problem by adding -fPIC to CXXFLAGS to compile .o files which are archived in the static library.

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