Linking Leap Motion SDK with Cmake - c++

Question

Im trying to build a project which uses the Myo SDK and the LeapMotion SDK on Windows 7 with CMake, Qt Creator and MinGW 4.9.2 32bit as compiler.
The MyoSDK ist working fine but I have some problems with linking the LeapMotion SDK in CMake. I found an existing sample CMake file which says that the Windows part is not finished.
Here is my CMakeLists.txt:
cmake_minimum_required (VERSION 2.6)
project (MyoLeapController)
#set(THALMICLABSMYO_ROOT_DIR "C:/myo-sdk-win-0.9.0")
################## MYO
if(WIN32)
set(THALMICLABSMYO_ROOT_DIR
"${THALMICLABSMYO_ROOT_DIR}"
CACHE
PATH
"Directory to search for the Thalmic Labs Myo SDK")
if(CMAKE_SIZEOF_VOID_P MATCHES "8")
set(_ARCH x86_64)
else()
set(_ARCH x86_32)
endif()
set(_SDKDIR Windows)
find_path(THALMICLABSMYO_INCLUDE_DIR
NAMES myo/libmyo.h
PATHS "${THALMICLABSMYO_ROOT_DIR}/include")
include(FindPackageHandleStandardArgs)
if(CMAKE_SIZEOF_VOID_P MATCHES "8")
find_library(THALMICLABSMYO_LIBRARY
NAMES myo64
PATHS "${THALMICLABSMYO_ROOT_DIR}/lib"
PATH_SUFFIXES "${_SDKDIR}/${_ARCH}")
else()
find_library(THALMICLABSMYO_LIBRARY
NAMES myo32
PATHS "${THALMICLABSMYO_ROOT_DIR}/lib"
PATH_SUFFIXES "${_SDKDIR}/${_ARCH}")
endif()
find_package_handle_standard_args(ThalmicLabsMyo
DEFAULT_MSG
THALMICLABSMYO_LIBRARY
THALMICLABSMYO_INCLUDE_DIR
${_deps_check})
if(THALMICLABSMYO_FOUND)
set(THALMICLABSMYO_LIBRARIES "${THALMICLABSMYO_LIBRARY}")
set(THALMICLABSMYO_INCLUDE_DIRS "${THALMICLABSMYO_INCLUDE_DIR}")
mark_as_advanced(THALMICLABSMYO_ROOT_DIR)
endif()
mark_as_advanced(THALMICLABSMYO_INCLUDE_DIR THALMICLABSMYO_LIBRARY)
endif()
################## LEAP
IF(LEAP_INCLUDE_DIR AND LEAP_LIBRARY)
SET(LEAP_FIND_QUIETLY TRUE)
ENDIF(LEAP_INCLUDE_DIR AND LEAP_LIBRARY)
# Set locations to search
IF(UNIX)
SET(LEAP_INCLUDE_SEARCH_DIRS
/usr/include
/usr/local/include
/opt/leap/include
/opt/leap_sdk/include
/opt/include INTERNAL)
SET(LEAP_LIBRARY_SEARCH_DIRS
/usr/lib
/usr/lib64
/usr/local/lib
/usr/local/lib64
/opt/leap/lib
/opt/leap/lib64
/opt/leap_sdk/lib
/opt/leap_sdk/lib64 INTERNAL)
SET(LEAP_INC_DIR_SUFFIXES PATH_SUFFIXES leap)
ELSE(UNIX)
#WIN32
SET(LEAP_INC_DIR_SUFFIXES PATH_SUFFIXES inc)
SET(LEAP_LIB_DIR_SUFFIXES PATH_SUFFIXES lib)
ENDIF(UNIX)
# Set name of the Leap library to use
IF(APPLE)
SET(LEAP_LIBRARY_NAME libLeap.dylib)
ELSE(APPLE)
IF(UNIX)
SET(LEAP_LIBRARY_NAME libLeap.so)
ELSE(UNIX)
# TODO Different libraries are provided for compile and runtime
SET(LEAP_LIBRARY_NAME libLeap.lib)
ENDIF(UNIX)
ENDIF(APPLE)
IF(NOT LEAP_FIND_QUIETLY)
MESSAGE(STATUS "Checking for Leap")
ENDIF(NOT LEAP_FIND_QUIETLY)
# Search for header files
FIND_PATH(LEAP_INCLUDE_DIR Leap.h
PATHS ${LEAP_INCLUDE_SEARCH_PATHS}
PATH_SUFFIXES ${LEAP_INC_DIR_SUFFIXES})
# Search for library
FIND_LIBRARY(LEAP_LIBRARY ${LEAP_LIBRARY_NAME}
PATHS ${LEAP_LIBRARY_SEARCH_DIRS}
PATH_SUFFIXES ${LEAP_LIB_DIR_SUFFIXES})
SET(LEAP_INCLUDE_DIR ${LEAP_INCLUDE_DIR} CACHE STRING
"Directory containing LEAP header files")
SET(LEAP_LIBRARY ${LEAP_LIBRARY} CACHE STRING "Library name of Leap library")
SET(LEAP_INCLUDE_DIRS ${LEAP_INCLUDE_DIR} )
SET(LEAP_LIBRARIES ${LEAP_LIBRARY} )
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Leap DEFAULT_MSG LEAP_LIBRARY LEAP_INCLUDE_DIR)
MARK_AS_ADVANCED(LEAP_INCLUDE_DIR LEAP_LIBRARY)
##################
message(${LEAP_LIBRARY})
INCLUDE_DIRECTORIES(${THALMICLABSMYO_INCLUDE_DIR} ${LEAP_INCLUDE_DIRS})
add_executable(MyoLeapController main.cpp)
target_link_libraries(MyoLeapController ${THALMICLABSMYO_LIBRARY} ${LEAP_LIBRARY})
My CMake output is:
C:/LeapSDK/lib/x86/Leap.dll
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/riecker/Documents/Masterthesis/MyoLeapController-bin
I link the found Leap library exactly the same like the Myo but I get some Linker errors.
My C++ program for testing:
#include <iostream>
#include <myo/myo.hpp>
#include <Leap.h>
int main (int argc, char *argv[])
{
//myo::Hub hub("MyoLeapController");
Leap::Controller controller;
std::cout << "hi" << std::endl;
return 0;
}
The Error Message:
[ 50%] Linking CXX executable MyoLeapController.exe
CMakeFiles\MyoLeapController.dir/objects.a(main.cpp.obj):main.cpp:(.text+0x1d): undefined reference to `Leap::Controller::Controller()'
CMakeFiles\MyoLeapController.dir/objects.a(main.cpp.obj):main.cpp:(.text+0x51): undefined reference to `Leap::Controller::~Controller()'
CMakeFiles\MyoLeapController.dir\build.make:98: recipe for target 'MyoLeapController.exe' failed
CMakeFiles\MyoLeapController.dir/objects.a(main.cpp.obj):main.cpp:(.text+0x61): undefined reference to `Leap::Controller::~Controller()'
CMakeFiles\Makefile2:66: recipe for target 'CMakeFiles/MyoLeapController.dir/all' failed
makefile:82: recipe for target 'all' failed
C:/Qt/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles\MyoLeapController.dir/objects.a(main.cpp.obj): bad reloc address 0x0 in section `.ctors'
collect2.exe: error: ld returned 1 exit status
mingw32-make[2]: *** [MyoLeapController.exe] Error 1
mingw32-make[1]: *** [CMakeFiles/MyoLeapController.dir/all] Error 2
mingw32-make: *** [all] Error 2
10:56:32: Der Prozess "C:\Qt\Tools\mingw492_32\bin\mingw32-make.exe" wurde mit dem Rückgabewert 2 beendet.
Fehler beim Erstellen/Deployment des Projekts MyoLeapController (Kit: Desktop Qt 5.6.0 MinGW 32bit)
Bei der Ausführung von Schritt "Make"
The include of the Leap SDK is working because it can find the header files only during linking I get the problem. For including and linking I am doing the same like with the Myo SDK which is working.
Can anybody help me or have an idea about this? Thank you

Answer 1

Leap Motion library does not support MinGW, so the library that you are trying to link is incompatible.
However, you can try the dll in this package. It comes from this thread. It seems to be only for 32-bit, but that's apparently what you are trying to build.
From the build directory where you got the error, first see if this command line works, then you can proceed to make it work within your cmake project:
C:\Qt\Tools\mingw492_32\bin\g++.exe -Wl,--whole-archive
CMakeFiles\MyoLeapController.dir/objects.a -Wl,--no-whole-archive -o
MyoLeapController.exe -Wl,--out-implib,libMyoLeapController.dll.a
-Wl,--major-image-version,0,--minor-image-version,0 -LC:/myo-sdk-win-0.9.0/lib/ -LpathToTheLeapDll -lLeap -lmyo32 -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32
If it works, when you try the executable make sure the libLeap.dll is available in your path or in your execution directory.