Test compiler changeable at build time

[crooney@pdx_edu]

Thank you! That solved the error I was encountering.

The regression tests script still has 2 failures but they look unrelated. I am about to start looking into what is causing them. The output is:
======================================================================
FAIL: test_compiler_changeable_at_build_time (__main__.H_TestMakeMacros)
The macro writer writes information for multiple compilers.
----------------------------------------------------------------------
Traceback (most recent call last):
File "./scripts_regression_tests.py", line 2458, in test_compiler_changeable_at_build_time
tester.assert_variable_equals("SUPPORTS_CXX", "FALSE")
File "./scripts_regression_tests.py", line 2190, in assert_variable_equals
self.parent.assertEqual(self.query_var(var_name, env, var), value)
AssertionError: 'TRUE' != 'FALSE'There is the same failure for __main__.I_TestCMakeMacros as well.