PR c/97882 - Segmentation Fault on improper redeclaration of function

PR c/97882 - Segmentation Fault on improper redeclaration of function

gcc/c/ChangeLog:

	PR c/97882
	* c-decl.c (locate_old_decl): Add type to diagnostic output.
	(diagnose_mismatched_decls): Same.
	(start_function): Introduce temporaries for better readability.
	* c-typeck.c (comptypes_internal): Only consider complete enum
	types in comparisons with integers.

gcc/testsuite/ChangeLog:

	PR c/97882
	* gcc.dg/decl-8.c: Adjust text of expected diagnostic.
	* gcc.dg/label-decl-4.c: Same.
	* gcc.dg/mismatch-decl-1.c: Same.
	* gcc.dg/old-style-then-proto-1.c: Same.
	* gcc.dg/parm-mismatch-1.c: Same.
	* gcc.dg/pr35445.c: Same.
	* gcc.dg/redecl-11.c: Same.
	* gcc.dg/redecl-12.c: Same.
	* gcc.dg/redecl-13.c: Same.
	* gcc.dg/redecl-15.c: Same.
	* gcc.dg/tls/thr-init-1.c: Same.
	* objc.dg/id-1.m: Same.
	* objc.dg/tls/diag-3.m: Same.
	* gcc.dg/pr97882.c: New test.
	* gcc.dg/qual-return-7.c: New test.
	* gcc.dg/qual-return-8.c: New test.