Unable to Link Libraries to Target? - c

Question

I have the following CMakeLists.txt, trying to build my software on Windows with MinGW-w64:
#
# Initial CMake and project setup
#
# Required CMake version (ExternalProject)
CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
INCLUDE(ExternalProject)
SET(PROJECT_NAME Khronos)
PROJECT(${PROJECT_NAME})
# Set software version
SET(APPLICATION_VERSION_MAJOR "0")
SET(APPLICATION_VERSION_MINOR "4")
SET(APPLICATION_VERSION_PATCH "0")
SET(APPLICATION_VERSION "${APPLICATION_VERSION_MAJOR}.${APPLICATION_VERSION_MINOR}.${APPLICATION_VERSION_PATCH}")
SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
SET_DIRECTORY_PROPERTIES(PROPERTIES EP_PREFIX ${CMAKE_BINARY_DIR}/library-build)
#
# Setup compiler flags
#
if (NOT CMAKE_BUILD_TYPE)
message(STATUS "No build type selected, default to Release")
set(CMAKE_BUILD_TYPE Release FORCE)
endif()
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -std=gnu11 -O0 -fprofile-arcs -ftest-coverage")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -std=gnu11 -O3")
if (GCC_VERSION VERSION_GREATER "4.8")
elsif (GCC_VERSION VERSION_GREATER "4.1.2")
SET (GCC_COMMON_WARNING_FLAGS "-pedantic -Wall -Wextra -Wconversion -Wfloat-equal -Wformat=2 -Winit-self -Winline -Winvalid-pch -Wlogical-op -Wmissing-declarations -Wmissing-include-dirs -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wstack-protector -Wstrict-null-sentinel -Wswitch-default -Wswitch-enum")
SET (GCC_COMMON_WARNING_FLAGS "${GCC_COMMON_WARNING_FLAGS} -Wno-unused-parameter")
SET (GCC_CXX_WARNING_FLAGS "-Wctor-dtor-privacy")
else ()
SET(GCC_COMMON_WARNING_FLAGS "-pedantic -Wall -Wextra -Wconversion -Wfloat-equal -Wformat=2 -Winit-self -Winline -Winvalid-pch -Wmissing-include-dirs -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wstack-protector -Wstrict-null-sentinel -Wswitch-default -Wswitch-enum")
SET(GCC_COMMON_WARNING_FLAGS "${GCC_COMMON_WARNING_FLAGS} -Wno-unused-parameter")
SET(GCC_CXX_WARNING_FLAGS "-Wctor-dtor-privacy")
endif ()
#
# Find Doxygen for documentation
#
# add a target to generate API documentation with Doxygen
FIND_PACKAGE(Doxygen)
if (DOXYGEN_FOUND)
ADD_CUSTOM_TARGET(DOC
${DOXYGEN_EXECUTABLE} ${CMAKE_SOURCE_DIR}/Doxyfile
WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/src
COMMENT "Generating API documentation with Doxygen" VERBATIM
)
endif ()
#
# Find/install dependencies
#
IF(WIN32)
INCLUDE(${CMAKE_MODULE_PATH}/Win32-ExternalProjects.txt)
ELSE(UNIX)
INCLUDE(${CMAKE_MODULE_PATH}/Unix-ExternalProjects.txt)
ENDIF()
#
# Final project settings
#
INCLUDE_DIRECTORIES(include)
ADD_SUBDIRECTORY(src)
ADD_EXECUTABLE(${PROJECT_NAME}
$<TARGET_OBJECTS:audio>
$<TARGET_OBJECTS:util>
$<TARGET_OBJECTS:main>
)
TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${LIBS})
if (DEPENDENCIES)
MESSAGE (STATUS "Any missing dependencies will be downloaded upon running \"make\"")
ADD_DEPENDENCIES(${PROJECT_NAME} ${DEPENDENCIES})
endif ()
I'm able to compile everything, but I'm having trouble linking the executable to the libraries:
"C:\Program Files (x86)\CMake\bin\cmake.exe" -HC:\Users\syb0rg\Downloads\Khronos -BC:\Users\syb0rg\Downloads\Khronos\build --check-build-system CMakeFiles\Makefile.cmake 0
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_progress_start C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles\progress.marks
make -f CMakeFiles\Makefile2 all
make[1]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f CMakeFiles\sphinxbase.dir\build.make CMakeFiles/sphinxbase.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles\sphinxbase.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f CMakeFiles\sphinxbase.dir\build.make CMakeFiles/sphinxbase.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `CMakeFiles/sphinxbase.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 17%] Built target sphinxbase
make -f CMakeFiles\LibSndFile.dir\build.make CMakeFiles/LibSndFile.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles\LibSndFile.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f CMakeFiles\LibSndFile.dir\build.make CMakeFiles/LibSndFile.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `CMakeFiles/LibSndFile.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 35%] Built target LibSndFile
make -f CMakeFiles\pocketsphinx.dir\build.make CMakeFiles/pocketsphinx.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles\pocketsphinx.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f CMakeFiles\pocketsphinx.dir\build.make CMakeFiles/pocketsphinx.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `CMakeFiles/pocketsphinx.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 53%] Built target pocketsphinx
make -f CMakeFiles\PortAudio.dir\build.make CMakeFiles/PortAudio.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles\PortAudio.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f CMakeFiles\PortAudio.dir\build.make CMakeFiles/PortAudio.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `CMakeFiles/PortAudio.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 71%] Built target PortAudio
make -f src\audio\CMakeFiles\audio.dir\build.make src/audio/CMakeFiles/audio.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\src\audio C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\src\audio C:\Users\syb0rg\Downloads\Khronos\build\src\audio\CMakeFiles\audio.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f src\audio\CMakeFiles\audio.dir\build.make src/audio/CMakeFiles/audio.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `src/audio/CMakeFiles/audio.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 73%] Built target audio
make -f src\util\CMakeFiles\util.dir\build.make src/util/CMakeFiles/util.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\src\util C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\src\util C:\Users\syb0rg\Downloads\Khronos\build\src\util\CMakeFiles\util.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f src\util\CMakeFiles\util.dir\build.make src/util/CMakeFiles/util.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `src/util/CMakeFiles/util.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 75%] Built target util
make -f src\CMakeFiles\main.dir\build.make src/CMakeFiles/main.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\src C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\src C:\Users\syb0rg\Downloads\Khronos\build\src\CMakeFiles\main.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f src\CMakeFiles\main.dir\build.make src/CMakeFiles/main.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `src/CMakeFiles/main.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 80%] Built target main
make -f CMakeFiles\tritium.dir\build.make CMakeFiles/tritium.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles\tritium.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f CMakeFiles\tritium.dir\build.make CMakeFiles/tritium.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[2]: Nothing to be done for `CMakeFiles/tritium.dir/build'.
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
[ 97%] Built target tritium
make -f CMakeFiles\Khronos.dir\build.make CMakeFiles/Khronos.dir/depend
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_depends "MinGW Makefiles" C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build C:\Users\syb0rg\Downloads\Khronos\build\CMakeFiles\Khronos.dir\DependInfo.cmake --color=
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make -f CMakeFiles\Khronos.dir\build.make CMakeFiles/Khronos.dir/build
make[2]: Entering directory `C:/Users/syb0rg/Downloads/Khronos/build'
[100%] Linking C executable Khronos.exe
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E cmake_link_script CMakeFiles\Khronos.dir\link.txt --verbose=1
"C:\Program Files (x86)\CMake\bin\cmake.exe" -E remove -f CMakeFiles\Khronos.dir/objects.a
C:\PROGRA~1\MINGW-~1\X86_64~1.0-P\mingw64\bin\ar.exe cr CMakeFiles\Khronos.dir/objects.a #CMakeFiles\Khronos.dir\objects1.rsp
C:\PROGRA~1\MINGW-~1\X86_64~1.0-P\mingw64\bin\gcc.exe -Wl,--whole-archive CMakeFiles\Khronos.dir/objects.a -Wl,--no-whole-archive -o Khronos.exe -Wl,--out-implib,libKhronos.dll.a -Wl,--major-image-version,0,--minor-image-version,0 #CMakeFiles\Khronos.dir\linklibs.rsp
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0xd2): undefined reference to `ps_start_utt'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x109): undefined reference to `ps_process_raw'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x115): undefined reference to `ps_get_in_speech'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x161): undefined reference to `ps_end_utt'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x172): undefined reference to `ps_get_hyp'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x185): undefined reference to `ps_start_utt'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x1ce): undefined reference to `ps_end_utt'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x1e8): undefined reference to `ps_get_hyp'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x24b): undefined reference to `getPathFromDescriptor'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x61c): undefined reference to `err_set_logfp'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x626): undefined reference to `err_set_debug_level'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x678): undefined reference to `ps_args'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x6d7): undefined reference to `cmd_ln_init'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x71f): undefined reference to `ps_init'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x7fb): undefined reference to `ps_free'
CMakeFiles\Khronos.dir/objects.a(main.c.obj):main.c:(.text+0x807): undefined reference to `cmd_ln_free_r'
collect2.exe: error: ld returned 1 exit status
make[2]: *** [Khronos.exe] Error 1
make[2]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make[1]: *** [CMakeFiles/Khronos.dir/all] Error 2
make[1]: Leaving directory `C:/Users/syb0rg/Downloads/Khronos/build'
make: *** [all] Error 2
Here's the ${LIBS} output from message() (in a more human readable form):
C:/Users/syb0rg/Downloads/Khronos/lib/sphinxbase/bin/Debug/Win32/sphinxbase.dll
C:/Users/syb0rg/Downloads/Khronos/lib/pocketsphinx/bin/Debug/Win32/pocketsphinx.dll
C:/Users/syb0rg/Downloads/Khronos/lib/PortAudio/libportaudio_x86.dll
C:/Users/syb0rg/Downloads/Khronos/lib/LibSndFile/libsndfile.dll
C:/Users/syb0rg/Downloads/Khronos/lib/tritium/libtritium.a
For reference, ${LIBS} is set here:
FIND_PACKAGE(sphinxbase)
if (${SPHINXBASE_FOUND})
INCLUDE_DIRECTORIES(${SPHINXBASE_INCLUDE_DIR}/sphinxbase/)
else ()
ExternalProject_Add(
sphinxbase
GIT_REPOSITORY "https://github.com/cmusphinx/sphinxbase.git"
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/sphinxbase
CONFIGURE_COMMAND ""
BUILD_COMMAND msbuild sphinxbase.sln /p:PlatformToolset=v140
UPDATE_COMMAND ""
INSTALL_COMMAND ""
BUILD_IN_SOURCE ON
LOG_DOWNLOAD ON
LOG_UPDATE ON
LOG_CONFIGURE ON
LOG_BUILD ON
LOG_TEST ON
LOG_INSTALL ON
)
ExternalProject_Get_Property(sphinxbase SOURCE_DIR)
ExternalProject_Get_Property(sphinxbase BINARY_DIR)
SET(SPHINXBASE_SOURCE_DIR ${SOURCE_DIR})
SET(SPHINXBASE_BINARY_DIR ${BINARY_DIR})
SET(SPHINXBASE_LIBRARIES ${SPHINXBASE_BINARY_DIR}/bin/Debug/Win32/sphinxbase.dll)
SET(DEPENDENCIES ${DEPENDENCIES} sphinxbase)
INCLUDE_DIRECTORIES(${SPHINXBASE_SOURCE_DIR}/include/win32)
INCLUDE_DIRECTORIES(${SPHINXBASE_SOURCE_DIR}/include)
endif ()
SET(LIBS ${LIBS} ${SPHINXBASE_LIBRARIES})
FIND_PACKAGE(pocketsphinx)
if (${POCKETSPHINX_FOUND})
INCLUDE_DIRECTORIES(${POCKETSPHINX_INCLUDE_DIR}/pocketsphinx/)
add_definitions( -DMODELDIR="/usr/local/share/pocketsphinx/model") # more portable?
else ()
ExternalProject_Add(
pocketsphinx
DEPENDS sphinxbase
GIT_REPOSITORY "https://github.com/cmusphinx/pocketsphinx.git"
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/pocketsphinx
CONFIGURE_COMMAND ""
BUILD_COMMAND msbuild pocketsphinx.sln /p:PlatformToolset=v140
UPDATE_COMMAND ""
INSTALL_COMMAND ""
BUILD_IN_SOURCE ON
LOG_DOWNLOAD ON
LOG_UPDATE ON
LOG_CONFIGURE ON
LOG_BUILD ON
LOG_TEST ON
LOG_INSTALL ON
)
ExternalProject_Get_Property(pocketsphinx SOURCE_DIR)
ExternalProject_Get_Property(pocketsphinx BINARY_DIR)
SET(POCKETSPHINX_SOURCE_DIR ${SOURCE_DIR})
SET(POCKETSPHINX_BINARY_DIR ${BINARY_DIR})
SET(POCKETSPHINX_LIBRARIES ${POCKETSPHINX_BINARY_DIR}/bin/Debug/Win32/pocketsphinx.dll)
SET(DEPENDENCIES ${DEPENDENCIES} pocketsphinx)
INCLUDE_DIRECTORIES(${POCKETSPHINX_SOURCE_DIR}/include/)
add_definitions(-DMODELDIR="${POCKETSPHINX_BINARY_DIR}/model")
endif ()
SET(LIBS ${LIBS} ${POCKETSPHINX_LIBRARIES})
FIND_PACKAGE(PortAudio)
if (${PORTAUDIO_FOUND})
INCLUDE_DIRECTORIES(${PORTAUDIO_INCLUDE_DIRS})
else ()
ExternalProject_Add(
PortAudio
GIT_REPOSITORY "https://github.com/syb0rg/PortAudio2.git"
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/PortAudio
UPDATE_COMMAND ""
INSTALL_COMMAND ""
BUILD_IN_SOURCE ON
LOG_DOWNLOAD ON
LOG_UPDATE ON
LOG_CONFIGURE ON
LOG_BUILD ON
LOG_TEST ON
LOG_INSTALL ON
)
ExternalProject_Get_Property(PortAudio SOURCE_DIR)
ExternalProject_Get_Property(PortAudio BINARY_DIR)
SET(PORTAUDIO_SOURCE_DIR ${SOURCE_DIR})
SET(PORTAUDIO_BINARY_DIR ${BINARY_DIR})
SET(PORTAUDIO_LIBRARIES ${PORTAUDIO_BINARY_DIR}/libportaudio_x86.dll)
SET(DEPENDENCIES ${DEPENDENCIES} PortAudio)
INCLUDE_DIRECTORIES(${PORTAUDIO_SOURCE_DIR}/include)
endif ()
SET(LIBS ${LIBS} ${PORTAUDIO_LIBRARIES})
FIND_PACKAGE(LibSndFile)
if(${LIBSNDFILE_FOUND})
INCLUDE_DIRECTORIES(${LIBSNDFILE_INCLUDE_DIRS})
else ()
ExternalProject_Add(
LibSndFile
GIT_REPOSITORY "https://github.com/syb0rg/libsndfile.git"
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/LibSndFile
UPDATE_COMMAND ""
INSTALL_COMMAND ""
BUILD_IN_SOURCE ON
LOG_DOWNLOAD ON
LOG_UPDATE ON
LOG_CONFIGURE ON
LOG_BUILD ON
LOG_TEST ON
LOG_INSTALL ON
)
ExternalProject_Get_Property(LibSndFile SOURCE_DIR)
ExternalProject_Get_Property(LibSndFile BINARY_DIR)
SET(LIBSNDFILE_SOURCE_DIR ${SOURCE_DIR}/src)
SET(LIBSNDFILE_BINARY_DIR ${BINARY_DIR})
SET(LIBSNDFILE_LIBRARIES ${LIBSNDFILE_BINARY_DIR}/libsndfile.dll)
SET(DEPENDENCIES ${DEPENDENCIES} LibSndFile)
INCLUDE_DIRECTORIES(${LIBSNDFILE_SOURCE_DIR})
endif ()
SET(LIBS ${LIBS} ${LIBSNDFILE_LIBRARIES})
FIND_PACKAGE(tritium)
if (${TRITIUM_FOUND})
INCLUDE_DIRECTORIES(${TRITIUM_INCLUDE_DIR}/)
else ()
ExternalProject_Add(
tritium
GIT_REPOSITORY "https://github.com/syb0rg/tritium.git"
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/tritium
UPDATE_COMMAND ""
INSTALL_COMMAND ""
BUILD_IN_SOURCE ON
LOG_DOWNLOAD ON
LOG_UPDATE ON
LOG_CONFIGURE ON
LOG_BUILD ON
LOG_TEST ON
LOG_INSTALL ON
)
ExternalProject_Get_Property(tritium SOURCE_DIR)
ExternalProject_Get_Property(tritium BINARY_DIR)
SET(TRITIUM_SOURCE_DIR ${SOURCE_DIR})
SET(TRITIUM_BINARY_DIR ${BINARY_DIR})
SET(TRITIUM_LIBRARIES ${TRITIUM_BINARY_DIR}/libtritium.a)
SET(DEPENDENCIES ${DEPENDENCIES} tritium)
INCLUDE_DIRECTORIES(${TRITIUM_SOURCE_DIR}/include)
endif ()
SET(LIBS ${LIBS} ${TRITIUM_LIBRARIES})
All of these libraries exist at the specified location. Any suggestions?

Answer 1

undefined reference to clearly stated you do not provide required object file/library with this (exported!) function to linker. There are two major causes:
You didn't pass this library to linker command line or didn't pass right search path (-L...) to it - check twice the resulting command line, make VERBOSE=1 will show more verbose output.
Path is correct, but file/function itself is invalid - you may compile library for different CPU architecture (e.g. trying to use x86 library when targeting x86_64). Also check function marked as exportable (in most cases it is the problem when using MSVC compiler, but you can hide functions with GCC/MinGW too). And do not forgot to check file is not zero-length :)

Answer 2

Can you try this:
set(CMAKE_BUILD_TYPE CACHE Release FORCE)
ref: https://cmake.org/cmake/help/v2.8.8/cmake.html#variable:CMAKE_CFG_INTDIR
search for : initial-cache