CMake failed to compile in Linux

Question

I am altering a CMake file which works on Windows to create a shared object in Linux.

The CMake file generates a makefile and when I did "make" on Linux, it built objects of foo libraries and it displays linking of all four libraries. For example:

Linking CXX static library lib_foo_d.a

and the final shared object

Linking CXX static library lib_scen_files_d.a

but at the end it displays

/usr/bin/ld: lib_foo3/lib_foo3_d.a(chap_alt_scence_defs.cpp.o):
relocation R_X86_64_32 against `.rodata' can not be used when making a shared object;
recompile with -fPIC
lib_foo3/lib_foo3_d.a: could not read symbols: Bad value
collect2: ld returned 1 exit status

I have tried a few other options, but no joy. Below is my CMakeLists.txt. Any help/criticism will be beneficial to me.

CMAKE_MINIMUM_REQUIRED( VERSION 2.8 )
CMAKE_POLICY( SET CMP0017 NEW ) 

PROJECT( disk_space_model )
INCLUDE( ../libs/helper_functions.cmake )
INCLUDE_THIRD_PARTY_SFC()
find_path_for_libs()

add_s_library( lib_foo1 )
add_s_library( lib_foo2) 
add_s_library( lib_foo3) 
add_s_library( lib_foo4) 

SET(    HEADER_FILES 
        stdafx.h
        INS_sensor_model.h
)

SET(    SOURCE_FILES
        Disk_space_model.cpp
)

SET(    RESOURCE_FILES 
        "Disk Space DLL.rc"
        resource.h
)

COMMON_SETUP()
set( LIB_FILES 
        lib_foo
        lib_foo1
        lib_foo3 
        lib_foo4 )

set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--export-all-symbols")
ADD_LIBRARY( disk_space_model SHARED ${SOURCE_FILES} ${HEADER_FILES} ${RESOURCE_FILES}  ${CMAKE_HELPER_FILES} )
SET_OUTPUT_DIRS( disk_space_model )
TARGET_LINK_LIBRARIES( disk_space_model ${LIB_FILES} )

Thanks ...

You use far too many custom macros that we don't know (cause they are in external files).... — Johannes S.

Angew is no longer proud of SO Angew is no longer proud of SO · Accepted Answer · 2013-03-07T15:31:32

The linker is telling you what is wrong: the object is used in a shared library, but wasn't compiled with -fPIC. You need to add this flag somehow.

When using CMake 2.8.9 or later, you can simply set property POSITION_INDEPENDENT_CODE on the target(s) in question (the static libraries).

With prior versions of CMake, you need to add the flag directly to the targets' COMPILE_FLAGS properties (in the proper spelling for your compiler, probably just -fPIC).

CMake failed to compile in Linux

2 Answers