gcc/ChangeLog:
2015-01-21  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* gimplify.c (gimplify_function_tree): Check the no_sanitize_thread
	decl attribute.

gcc/testsuite/ChangeLog
2015-01-21  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* gcc/testsuite/c-c++-common/tsan/step.c: New testcase.