analyzer: new warning: -Wanalyzer-overlapping-buffers [PR99860]

analyzer: new warning: -Wanalyzer-overlapping-buffers [PR99860]

gcc/ChangeLog:
	PR analyzer/99860
	* Makefile.in (ANALYZER_OBJS): Add analyzer/ranges.o.

gcc/analyzer/ChangeLog:
	PR analyzer/99860
	* analyzer-selftests.cc (selftest::run_analyzer_selftests): Call
	selftest::analyzer_ranges_cc_tests.
	* analyzer-selftests.h (selftest::run_analyzer_selftests): New
	decl.
	* analyzer.opt (Wanalyzer-overlapping-buffers): New option.
	* call-details.cc: Include "analyzer/ranges.h" and "make-unique.h".
	(class overlapping_buffers): New.
	(call_details::complain_about_overlap): New.
	* call-details.h (call_details::complain_about_overlap): New decl.
	* kf.cc (kf_memcpy_memmove::impl_call_pre): Call
	cd.complain_about_overlap for memcpy and memcpy_chk.
	(kf_strcat::impl_call_pre): Call cd.complain_about_overlap.
	(kf_strcpy::impl_call_pre): Likewise.
	* ranges.cc: New file.
	* ranges.h: New file.

gcc/ChangeLog:
	PR analyzer/99860
	* doc/invoke.texi: Add -Wanalyzer-overlapping-buffers.

gcc/testsuite/ChangeLog:
	PR analyzer/99860
	* c-c++-common/analyzer/overlapping-buffers.c: New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>