"relocation R_X86_64_32 against `.bss' can not be used when making a shared..." error

[aryan_]

Hi All,

I am getting "relocation R_X86_64_32 against `.bss' can not be used when making a shared object; recompile with -fPIC" error when compiling a shared object with optimization option -O2 enabled using GNU GCC:

First, I compile a static library, which is used by the shared object, as follows:

g++  -g -O2 -c common/src/packet-class-registry.cc
ar  -cvq libclassreg.a common/src/packet-class-registry.o

Below is how I compile the shared object, which uses libclassreg.a:

g++  -g -O2 -fPIC -c packet-v4.cc -o packet-v4.o 
gcc  -shared -Wl,-soname,libv4.so.1 -o libv4.so.1.0 packet-v4.o -Lcommon/lib -Lconf/configLib/lib -lclassreg -lNsConf 
/usr/bin/ld: common/lib/libclassreg.a(packet-class-registry.o): relocation R_X86_64_32 against `.bss' can not be used when making a shared object; recompile with -fPIC
common/lib/libclassreg.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [libv4.so] Error 1

Is this a problem regarding the order of compiler options ? (-O2 appears before -fPIC)

Or is it something else ?

Thanks.

[Rubberman]

I use the -fPIC options for both static and dynamic libraries. It doesn't hurt the static library, plus it allows you to either use the static library in a shared one, or to extract the .o files from it to build into another shared library. Since your shared library is taking components from libclassreg.a, you need to build that static library and ALL of its components with the -fPIC option. Best option, make -fPIC part of all of your CFLAGS settings and rebuild everything to be sure they are all relocatable.