2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/82466
	* doc/invoke.texi ([Wbuiltin-declaration-mismatch]): Extend
	description.

/cp
2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/82466
	* decl.c (duplicate_decls): Warn for built-in functions declared as
	non-function, use OPT_Wbuiltin_declaration_mismatch.

	* decl.c (duplicate_decls): Avoid redundant '+' in warning_at.

/c
2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/82466
	* c-decl.c (diagnose_mismatched_decls): Use
	OPT_Wbuiltin_declaration_mismatch.

/testsuite
2017-10-24  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/82466
	* c-c++-common/Wbuiltin-declaration-mismatch-1.c: New.
	* c-c++-common/Wno-builtin-declaration-mismatch-1.c: Likewise.
	* g++.dg/warn/Wbuiltin_declaration_mismatch-1.C: Likewise.
	* g++.dg/parse/builtin2.C: Adjust.
	* g++.old-deja/g++.mike/p811.C: Likewise.

From-SVN: r254057