gcc/ChangeLog:

	PR middle-end/78519
	* gimple-ssa-sprintf.c (format_string): Handle null pointers.
	(format_directive): Diagnose null pointer arguments.
	(pass_sprintf_length::handle_gimple_call): Diagnose null destination
	pointers.  Correct location of null format string in diagnostics.

gcc/testsuite/ChangeLog:

	PR middle-end/78519
	* gcc.dg/tree-ssa/builtin-sprintf-warn-7.c: New test.

From-SVN: r243684