[CMake] fix Boost use

Using both ADD_PROJECT_DEPEDENCY & FIND_PACKAGE for Boost breaks uses of
${Boost_LIBRARIES}: only the last call to one ore the other is taken
into account.

I suggest to use ${Boost_LIBRARIES} for exported ones, and eg.
${Boost_UNIT_TEST_FRAMEWORK_LIBRARY} for the private ones.

Author: nim65s

CMakeLists.txt

@@ -31,9 +31,9 @@ CHECK_MINIMAL_CXX_STANDARD(11 ENFORCE)
 INCLUDE(cmake/pthread.cmake)  # needs to be included after the CXX definition
 
 # Project dependencies
-ADD_PROJECT_DEPENDENCY(Eigen3 REQUIRED PKG_CONFIG_REQUIRES eigen3)
-ADD_PROJECT_DEPENDENCY(Boost REQUIRED COMPONENTS serialization system thread)
 FIND_PACKAGE(Boost REQUIRED COMPONENTS unit_test_framework)
+ADD_PROJECT_DEPENDENCY(Boost REQUIRED COMPONENTS serialization system thread)
+ADD_PROJECT_DEPENDENCY(Eigen3 REQUIRED PKG_CONFIG_REQUIRES eigen3)
 SEARCH_FOR_PTHREAD()
 
 # Add configuration headers for plug-ins.
@@ -129,10 +129,10 @@ ADD_LIBRARY(${PROJECT_NAME} SHARED
 TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} SYSTEM PUBLIC ${EIGEN3_INCLUDE_DIR}
   ${Boost_INCLUDE_DIRS})
 TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} PUBLIC $<INSTALL_INTERFACE:include>)
-TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${Boost_LIBRARIES})
+TARGET_LINK_LIBRARIES(${PROJECT_NAME} PUBLIC ${Boost_LIBRARIES})
 
 IF(UNIX)
-  TARGET_LINK_LIBRARIES(${PROJECT_NAME} ${CMAKE_DL_LIBS} pthread)
+  TARGET_LINK_LIBRARIES(${PROJECT_NAME} PUBLIC ${CMAKE_DL_LIBS} pthread)
 ENDIF(UNIX)
 
 IF(SUFFIX_SO_VERSION)

tests/CMakeLists.txt

@@ -8,15 +8,15 @@ ADD_DEFINITIONS(-DTESTS_DYNLIBSUFFIX="${CMAKE_SHARED_LIBRARY_SUFFIX}")
 
 MACRO(DYNAMIC_GRAPH_TEST NAME)
   ADD_UNIT_TEST(${NAME} ${NAME}.cpp)
-  TARGET_LINK_LIBRARIES(${NAME} ${PROJECT_NAME} ${Boost_LIBRARIES})
+  TARGET_LINK_LIBRARIES(${NAME} PRIVATE ${PROJECT_NAME} ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY})
 ENDMACRO(DYNAMIC_GRAPH_TEST)
 
 # Signal cast test.
 SET(signalcast_libs signal-cast-registerer-libA signal-cast-registerer-libB)
 
 FOREACH(lib ${signalcast_libs})
   ADD_LIBRARY(${lib} SHARED ${lib})
-  TARGET_LINK_LIBRARIES(${lib} ${PROJECT_NAME})
+  TARGET_LINK_LIBRARIES(${lib} PRIVATE ${PROJECT_NAME})
 ENDFOREACH()
 
 DYNAMIC_GRAPH_TEST(signal-cast-registerer)
@@ -34,13 +34,13 @@ DYNAMIC_GRAPH_TEST(signal-ptr)
 DYNAMIC_GRAPH_TEST(real-time-logger)
 DYNAMIC_GRAPH_TEST(debug-trace)
 DYNAMIC_GRAPH_TEST(debug-tracer)
-TARGET_LINK_LIBRARIES(debug-tracer tracer)
+TARGET_LINK_LIBRARIES(debug-tracer PRIVATE tracer)
 DYNAMIC_GRAPH_TEST(debug-real-time-tracer)
-TARGET_LINK_LIBRARIES(debug-real-time-tracer tracer-real-time tracer)
+TARGET_LINK_LIBRARIES(debug-real-time-tracer PRIVATE tracer-real-time tracer)
 DYNAMIC_GRAPH_TEST(debug-logger)
 DYNAMIC_GRAPH_TEST(debug-logger-winit)
 DYNAMIC_GRAPH_TEST(signal-all)
 DYNAMIC_GRAPH_TEST(command-test)
 DYNAMIC_GRAPH_TEST(test-mt)
-TARGET_LINK_LIBRARIES(test-mt tracer)
+TARGET_LINK_LIBRARIES(test-mt PRIVATE tracer)
 DYNAMIC_GRAPH_TEST(exceptions)