Error linking to Boost filesystem using cmake on cygwin - c++

Question

I'm using cmake 2.8.9, g++ 3.4.4, and Boost 1.50. in Cygwin on Windows 8 64 bit.
Here is the error message I get.
Linking CXX executable RayTracer.exe
CMakeFiles/RayTracer.dir/Ray_Tracer.cpp.o:Ray_Tracer.cpp:(.text+0x89c):
undefined reference to boost::system::generic_category()'
CMakeFiles/RayTracer.dir/Ray_Tracer.cpp.o:Ray_Tracer.cpp:(.text+0x8a6):
undefined reference toboost::system::generic_category()'
CMakeFiles/RayTracer.dir/Ray_Tracer.cpp.o:Ray_Tracer.cpp:(.text+0x8b0):
undefined reference to boost::system::system_category()'
/usr/lib/gcc/i686-pc-cygwin/4.5.3/../../../../i686-pc-cygwin/bin/ld:
CMakeFiles/RayTracer.dir/Ray_Tracer.cpp.o: bad reloc address 0xb in
section
.text$_ZN5boost6system14error_categoryD1Ev[boost::system::error_category::~error_category()]'
collect2: ld returned 1 exit status
CMakeFiles/RayTracer.dir/build.make:94: recipe for target
RayTracer.exe' failed make[2]: *** [RayTracer.exe] Error 1
CMakeFiles/Makefile2:64: recipe for target
CMakeFiles/RayTracer.dir/all' failed make[1]: *
[CMakeFiles/RayTracer.dir/all] Error 2 Makefile:75: recipe for target
`all' failed make: * [all] Error 2
From what I've seen, the usual problem is failing to link the boost system library, but I made sure to do that. Here is the relevant portion of my CMakeLists.txt file:
#Edit: cmake can't find the static libraries on cygwin, so I'm setting this to false for now.
SET(Boost_USE_STATIC_LIBS FALSE)
FIND_PACKAGE(Boost 1.50 REQUIRED date_time program_options thread filesystem system unit_test_framework)
IF(${Boost_FOUND})
INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIR})
ENDIF()
add_executable(RayTracer
Ray_Tracer.cpp
)
target_link_libraries(RayTracer ${Boost_PROGRAM_OPTIONS_LIBRARIES})
And here's the line in my .cpp file that triggers the error:
#include <boost/filesystem.hpp>
Any idea what I'm doing wrong?

Answer 1

You need to tell the linker to link Boost.Filesystem and Boost.System libraries.
You can do:
target_link_libraries(RayTracer
${Boost_PROGRAM_OPTIONS_LIBRARIES}
${Boost_FILESYSTEM_LIBRARIES}
${Boost_SYSTEM_LIBRARIES}
)
or if you just want to link all the libs specified in your find_package(Boost...) call, you can do:
target_link_libraries(RayTracer ${Boost_LIBRARIES})
For further details on the FindBoost CMake module, see the docs or run:
cmake --help-module FindBoost