Introduced eos_3RDPARTY_DIR, so CMakeLists in subdirectories can point to the 3rdparty dir

CMakeLists.txt

@@ -55,11 +55,13 @@ find_package(Eigen3 REQUIRED)
 message(STATUS "Eigen3 found: ${EIGEN3_FOUND}, version: ${EIGEN3_VERSION}")
 message(STATUS "Eigen3 include dir found at ${EIGEN3_INCLUDE_DIR}")
 
+set(eos_3RDPARTY_DIR "${CMAKE_CURRENT_SOURCE_DIR}/3rdparty") # this is used by the CMakeLists.txt files in the subdirectories
+
 # Set the include directories of the 3rd-party submodules that we use:
-set(CEREAL_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/cereal-1.1.1/include")
-set(glm_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/glm")
-set(nanoflann_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/nanoflann/include")
-set(eigen3_nnls_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/eigen3-nnls/src")
+set(CEREAL_INCLUDE_DIR "${eos_3RDPARTY_DIR}/cereal-1.1.1/include")
+set(glm_INCLUDE_DIR "${eos_3RDPARTY_DIR}/glm")
+set(nanoflann_INCLUDE_DIR "${eos_3RDPARTY_DIR}/nanoflann/include")
+set(eigen3_nnls_INCLUDE_DIR "${eos_3RDPARTY_DIR}/eigen3-nnls/src")
 
 # Header files of the eos library:
 set(HEADERS

matlab/CMakeLists.txt

@@ -33,7 +33,7 @@ matlab_add_mex(
   #[...]
 )
 
-target_include_directories(eos-matlab-fitting PRIVATE ${CMAKE_SOURCE_DIR}/3rdparty/mexplus/include ${CMAKE_SOURCE_DIR}/matlab/include)
+target_include_directories(eos-matlab-fitting PRIVATE ${eos_3RDPARTY_DIR}/mexplus/include ${CMAKE_CURRENT_SOURCE_DIR}/include)
 
 install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/demo.m DESTINATION matlab)
 install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include DESTINATION matlab)