c++ - Compilation fails with "relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a shared object"

Question

I'm trying to compile this source code from the makefile in a VPS, but its not working. The VPS is a 64 Cent OS

Here's the full error

# make
gcc -c -O3 -w -DLINUX -I../SDK/amx/ ../SDK/amx/*.c
g++ -c -O3 -w -DLINUX -I../SDK/amx/ ../SDK/*.cpp
g++ -c -O3 -w -DLINUX -I../SDK/amx/ *.cpp
g++ -O2 -fshort-wchar -shared -o "TCP_V1.so" *.o
/usr/bin/ld: TCP-LINUX_V1.o: relocation R_X86_64_32 against `.rodata.str1.8' can not be     used when making a shared object; recompile with -fPIC
TCP-LINUX_V1.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [all] Error 1

Here's my makefile:

GPP=g++
GCC=gcc
OUTFILE="TCP_V1.so"

COMPILE_FLAGS=-c -O3 -w -DLINUX -I../SDK/amx/

all:
    $(GCC) $(COMPILE_FLAGS) ../SDK/amx/*.c
    $(GPP) $(COMPILE_FLAGS) ../SDK/*.cpp
    $(GPP) $(COMPILE_FLAGS) *.cpp
    $(GPP) -O2 -fshort-wchar -shared -o $(OUTFILE) *.o

Anyone know what's wrong?

Answer 1

Do what the compiler tells you to do, i.e. recompile with -fPIC. To learn what does this flag do and why you need it in this case, see Code Generation Options of the GCC manual.

In brief, the term position independent code (PIC) refers to the generated machine code which is memory address agnostic, i.e. does not make any assumptions about where it was loaded into RAM. Only position independent code is supposed to be included into shared objects (SO) as they should have an ability to dynamically change their location in RAM.

Finally, you can read about it on Wikipedia too.