gcc/ChangeLog:

	PR tree-optimization/89644
	* tree-ssa-strlen.c (handle_builtin_stxncpy): Consider unterminated
	arrays in determining sequence sizes in strncpy and stpncpy.

gcc/testsuite/ChangeLog:

	PR tree-optimization/89644
	* gcc.dg/Wstringop-truncation-8.c: New test.

From-SVN: r269807