[cmake] Add the possibility to install only the python binding.

This is not enough to reflect all the patches from robotpkg
about conflict when installing separatly python and C++ code.

CMakeLists.txt

@@ -48,6 +48,8 @@ SEARCH_FOR_EIGEN()
 ADD_REQUIRED_DEPENDENCY("dynamic-graph >= 3.0.0")
 
 OPTION (BUILD_PYTHON_INTERFACE "Build the python binding" ON)
+OPTION (INSTALL_PYTHON_INTERFACE_ONLY "Install *ONLY* the python binding" OFF)
+
 IF(BUILD_PYTHON_INTERFACE)
   FINDPYTHON(2.7 EXACT REQUIRED)
   STRING(REGEX REPLACE "-" "_" PY_NAME ${PROJECT_NAME})

include/CMakeLists.txt

@@ -80,7 +80,9 @@ SET(NEWHEADERS
   sot/core/variadic-op.hh
   sot/core/robot-utils.hh
   )
-INSTALL(FILES ${NEWHEADERS}
-  DESTINATION include/sot/core
-  PERMISSIONS OWNER_READ GROUP_READ WORLD_READ OWNER_WRITE
-  )
+IF (NOT INSTALL_PYTHON_INTERFACE_ONLY)
+  INSTALL(FILES ${NEWHEADERS}
+    DESTINATION include/sot/core
+    PERMISSIONS OWNER_READ GROUP_READ WORLD_READ OWNER_WRITE
+    )
+ENDIF (NOT INSTALL_PYTHON_INTERFACE_ONLY)

src/CMakeLists.txt

@@ -170,8 +170,10 @@ ENDIF(UNIX AND NOT APPLE)
 
 TARGET_LINK_LIBRARIES(${LIBRARY_NAME} ${Boost_LIBRARIES})
 
-INSTALL(TARGETS ${LIBRARY_NAME}
-  DESTINATION ${CMAKE_INSTALL_LIBDIR})
+IF (NOT INSTALL_PYTHON_INTERFACE_ONLY)
+  INSTALL(TARGETS ${LIBRARY_NAME}
+    DESTINATION ${CMAKE_INSTALL_LIBDIR})
+ENDIF(NOT INSTALL_PYTHON_INTERFACE_ONLY)
 
 #Plugins compilation, link, and installation
 #Compiles a plugin. The plugin library is ${LIBRARY_NAME}