PR middle-end/78521 - [7 Regression] incorrect byte count in -Wformat-length warning...

PR middle-end/78521 - [7 Regression] incorrect byte count in -Wformat-length warning with non-constant width or precision
PR middle-end/78520 - missing warning for snprintf with size greater than INT_MAX

gcc/ChangeLog:

	PR middle-end/78520
	* gimple-ssa-sprintf.c (target_max_value): Remove.
	(target_int_max, target_size_max): Use TYPE_MAX_VALUE.
	(get_width_and_precision): New function.
	(format_integer, format_floating, get_string_length, format_string):
	Correct handling of width and precision with unknown value.
	(format_directive): Add warning.
	(pass_sprintf_length::compute_format_length): Allow for precision
	to consist of a sole period with no asterisk or digits after it.

gcc/testsuite/ChangeLog:

	PR middle-end/78520
	* gcc.dg/tree-ssa/builtin-sprintf-5.c: Add test cases.
	* gcc.dg/tree-ssa/builtin-sprintf-6.c: New test.
	* gcc.dg/tree-ssa/builtin-sprintf-warn-1.c: Add test cases.
	* gcc.dg/tree-ssa/builtin-sprintf-warn-3.c: Add test cases.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@242935 138bc75d-0d04-0410-961f-82ee72b054a4