Simplify generator expression to one line, add to more targets

examples/CMakeLists.txt

@@ -29,28 +29,16 @@ else(Boost_FOUND)
   message(FATAL_ERROR "Boost not found")
 endif()
 
-
-# set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthreads") # IF GCC OR CLANG!
-# Eigen::LevenbergMarquardt probably needs -pthreads. => So eos needs pthreads! How to add in modern CMake?
-# Cleaner way would be to add it to fit-model's target_link_libraries, but that requires a CMake >2.8.10.
-# clang and gcc.
-# Or if we include Eigen in a modern way, it may include it as a transitive dependency and the problem may go away.
-
 # Simple model fitting (orthographic camera & shape to landmarks) example:
 add_executable(fit-model-simple fit-model-simple.cpp)
 target_link_libraries(fit-model-simple eos ${OpenCV_LIBS} ${Boost_LIBRARIES})
-
-target_compile_options(fit-model-simple PUBLIC "$<$<CXX_COMPILER_ID:GNU>:-pthread>")
-target_compile_options(fit-model-simple PUBLIC "$<$<CXX_COMPILER_ID:Clang>:-pthreads>")
+target_link_libraries(fit-model-simple "$<$<CXX_COMPILER_ID:GNU>:-pthread> $<$<CXX_COMPILER_ID:Clang>:-pthreads>")
 
 # Model fitting example that fits orthographic camera, shape, blendshapes, and contours:
 add_executable(fit-model fit-model.cpp)
 target_link_libraries(fit-model eos ${OpenCV_LIBS} ${Boost_LIBRARIES})
+target_link_libraries(fit-model "$<$<CXX_COMPILER_ID:GNU>:-pthread> $<$<CXX_COMPILER_ID:Clang>:-pthreads>")
 
-#target_compile_options(fit-model PUBLIC "$<$<CXX_COMPILER_ID:GNU>:-pthread>")
-#target_compile_options(fit-model PUBLIC "$<$<CXX_COMPILER_ID:Clang>:-pthreads>") # => clang says this is unused during compilation!
-target_link_libraries(fit-model "$<$<CXX_COMPILER_ID:GNU>:-pthread>")
-target_link_libraries(fit-model "$<$<CXX_COMPILER_ID:Clang>:-pthreads>")
 
 if(EOS_BUILD_CERES_EXAMPLE)
 	# Find Ceres, for the fit-model-ceres app: