py3k: Clear cached CMake vars so that 2+3 builds work.

Signed-off-by: Elliott Sales de Andrade <[email protected]>

Author: QuLogic

wrappers/python/CMakeLists.txt

@@ -4,6 +4,22 @@
 
 macro(Python_BUILD_EXTENSION Python_BUILD_VERSION)
 
+# Unfortunately, we can't use the cache because it treats 2 and 3 the same, so
+# we wouldn't be able to compile against both.
+foreach(_python_var
+    PYTHONINTERP_FOUND PYTHON_EXECUTABLE PYTHON_VERSION_STRING
+    PYTHON_VERSION_MAJOR PYTHON_VERSION_MINOR PYTHON_VERSION_PATCH)
+  unset(${_python_var})
+  unset(${_python_var} CACHE)
+endforeach(_python_var)
+foreach(_python_var
+    PYTHONLIBS_FOUND PYTHONLIBS_VERSION_STRING PYTHON_DEBUG_LIBRARIES
+    PYTHON_INCLUDE_DIR PYTHON_INCLUDE_DIRS PYTHON_INCLUDE_PATH PYTHON_LIBRARIES
+    PYTHON_LIBRARY PYTHON_LIBRARY_DEBUG)
+  unset(${_python_var})
+  unset(${_python_var} CACHE)
+endforeach(_python_var)
+
 set(Python_ADDITIONAL_VERSIONS ${Python_BUILD_VERSION})
 find_package(PythonInterp)
 set(PYTHON${Python_BUILD_VERSION}INTERP_FOUND    ${PYTHONINTERP_FOUND})
@@ -21,6 +37,16 @@ set(PYTHON${Python_BUILD_VERSION}_INCLUDE_DIRS       ${PYTHON_INCLUDE_DIRS})
 set(PYTHON${Python_BUILD_VERSION}_LIBRARIES          ${PYTHON_LIBRARIES})
 find_program(CYTHON_EXECUTABLE cython)
 
+if(NOT ${PYTHON${Python_BUILD_VERSION}_VERSION_MAJOR} EQUAL ${Python_BUILD_VERSION})
+  message(FATAL_ERROR "Unable to find Python ${Python_BUILD_VERSION} interpreter.")
+endif()
+if(NOT ${PYTHON${Python_BUILD_VERSION}_VERSION_STRING} EQUAL ${PYTHON${Python_BUILD_VERSION}LIBS_VERSION_STRING})
+  message(FATAL_ERROR
+          "Unable to find consistent Python ${Python_BUILD_VERSION} libraries. "
+          "Python interpreter is ${PYTHON${Python_BUILD_VERSION}_VERSION_STRING}, "
+          "but libraries are ${PYTHON${Python_BUILD_VERSION}LIBS_VERSION_STRING}.")
+endif()
+
 # Figure out installation path
 execute_process(COMMAND
   ${PYTHON${Python_BUILD_VERSION}_EXECUTABLE}