ENH: Only run python summary tests with compatible versions

The summary tests python script requires features that are
only available in python 2.7 and greater.  If the python
version is insufficient, simply disable the summary tests.

This was identified on a nightly dashboard build zoot.icl.utk.edu
where the python version found is 2.4.

Author: hjmjohnson

CMakeLists.txt

@@ -37,7 +37,7 @@ set(
 configure_file(
   "${LAPACK_SOURCE_DIR}/CTestCustom.cmake.in"
   "${LAPACK_BINARY_DIR}/CTestCustom.cmake"
-  COPYONLY
+  @ONLY
 )
 
 # Add the CMake directory for custon CMake modules
@@ -85,10 +85,12 @@ if ( CMAKE_Fortran_COMPILER_ID STREQUAL "Compaq" )
 endif()
 
 # Get Python
-find_package(PythonInterp)
-message(STATUS "Looking for Python found - ${PYTHONINTERP_FOUND}")
+message(STATUS "Looking for Python greater than 2.6 - ${PYTHONINTERP_FOUND}")
+find_package(PythonInterp 2.7) # lapack_testing.py uses features from python 2.7 and greater
 if (PYTHONINTERP_FOUND)
    message(STATUS "Using Python version ${PYTHON_VERSION_STRING}")
+else()
+   message(STATUS "No suitable Python version found, so skipping summary tests.")
 endif()
 # --------------------------------------------------
 

CTestCustom.cmake.in

@@ -43,4 +43,10 @@ set(CTEST_CUSTOM_WARNING_EXCEPTION
   "Character string truncated to length 1 on assignment"
 )
 
-set(CTEST_CUSTOM_POST_TEST "./lapack_testing.py -s -d TESTING")
+# Only rung post test if suitable python interpreter was found
+set(PYTHONINTERP_FOUND @PYTHONINTERP_FOUND@)
+set(PYTHON_EXECUTABLE  @PYTHON_EXECUTABLE@)
+if(PYTHONINTERP_FOUND)
+  set(CTEST_CUSTOM_POST_TEST "${PYTHON_EXECUTABLE} ./lapack_testing.py -s -d TESTING")
+endif()
+

TESTING/CMakeLists.txt

@@ -307,10 +307,13 @@ if (BUILD_COMPLEX)
 endif()
 
 # ==============================================================================
-
-execute_process(COMMAND ${CMAKE_COMMAND} -E copy ${LAPACK_SOURCE_DIR}/lapack_testing.py ${LAPACK_BINARY_DIR})
- add_test(
-  NAME LAPACK_Test_Summary
-  WORKING_DIRECTORY ${LAPACK_BINARY_DIR}
-  COMMAND ${PYTHON_EXECUTABLE} "lapack_testing.py"
- )
+# Only run this test if python 2.7 or greater is found
+if(PYTHONINTERP_FOUND)
+  message(STATUS "Running Summary")
+  execute_process(COMMAND ${CMAKE_COMMAND} -E copy ${LAPACK_SOURCE_DIR}/lapack_testing.py ${LAPACK_BINARY_DIR})
+   add_test(
+    NAME LAPACK_Test_Summary
+    WORKING_DIRECTORY ${LAPACK_BINARY_DIR}
+    COMMAND ${PYTHON_EXECUTABLE} "lapack_testing.py"
+   )
+endif()