I am trying to compile a shared library in Linux using a Makefile created with Cmake, but running make I obtain the following error:
Linking CXX shared library libcpp-lib.so /usr/bin/ld: /home/davide/Desktop/boost_1_55_0/stage/lib/libboost_system.a(error_code.o): relocation R_X86_64_32 against .rodata.str1.1 can not be used when making a shared object; recompile with -fPIC /home/davide/Desktop/boost_1_55_0/stage/lib/libboost_system.a: could not read symbols: Bad value collect2: ld returned 1 exit status make[2]: *** [libcpp-lib.so] Error 1 make[1]: *** [CMakeFiles/cpp-lib.dir/all] Error 2 make: *** [all] Error 2
I provide the following command in the CMakeLists.txt in order to say that I want a shared (.so) library:
add_library(cpp-lib SHARED ${CPP_FILES})
What else do I need to specify in order to avoid the -fPIC error shown above?
Thanks a lot in advance
Advertisement
Answer
The boost libraries needs to be compiled using -fPIC: Please have a look at: How to compile static library with -fPIC from boost.python
Try to add compiler flags by cmake by in your project:
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC") set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")