Remove cmake message when USE_PYTHON3 was already on

CMakeLists.txt

@@ -27,7 +27,7 @@ include(VERSION.cmake)
 
 # --- Declare project-wide user flags, and set default values ---
 option(BORNAGAIN_PYTHON "Build with python support" ON)
-option(BORNAGAIN_USE_PYTHON3 "Build against python 3.5 instead of 2.7" OFF)
+option(BORNAGAIN_USE_PYTHON3 "Build against python 3.x instead of 2.7" ON)
 option(BORNAGAIN_GENERATE_BINDINGS "Generate python bindings during build (requires swig)" OFF)
 option(BORNAGAIN_GENERATE_PYTHON_DOCS "Generate python documentation from the doxygen comments" OFF)
 option(BORNAGAIN_GUI "Build a graphical user interface" ON)

cmake/bornagain/modules/SearchInstalledSoftware.cmake

@@ -60,7 +60,7 @@ if(BORNAGAIN_PYTHON OR BORNAGAIN_GUI)
     endif()
     message(STATUS "Found Python libraries version ${PYTHONLIBS_VERSION_STRING} at ${PYTHON_LIBRARIES}; includes at ${PYTHON_INCLUDE_DIRS}")
 
-    if(PYTHONLIBS_VERSION_STRING MATCHES "^3.*$")
+    if(PYTHONLIBS_VERSION_STRING MATCHES "^3.*$" AND NOT BORNAGAIN_USE_PYTHON3)
         set(BORNAGAIN_USE_PYTHON3 ON)
         message(STATUS "Python 3 will be used. Setting BORNAGAIN_USE_PYTHON3 to ${BORNAGAIN_USE_PYTHON3}.")
     endif()