re PR c/6940 (taking sizeof array parameter should trigger a warning)

re PR c/6940 (taking sizeof array parameter should trigger a warning)

	PR c/6940
	* doc/invoke.texi: Document -Wsizeof-array-argument.
c-family/
	* c.opt (Wsizeof-array-argument): New option.
c/
	* c-decl.c (grokdeclarator): Set C_ARRAY_PARAMETER.
	* c-tree.h (C_ARRAY_PARAMETER): Define.
	* c-typeck.c (c_expr_sizeof_expr): Warn when using sizeof on an array
	function parameter.
cp/
	* cp-tree.h (DECL_ARRAY_PARAMETER_P): Define.
	* decl.c (grokdeclarator): Set DECL_ARRAY_PARAMETER_P.
	* typeck.c (cxx_sizeof_expr): Warn when using sizeof on an array
	function parameter.
testsuite/
	* c-c++-common/Wsizeof-pointer-memaccess1.c: Use
	-Wno-sizeof-array-argument.
	* c-c++-common/Wsizeof-pointer-memaccess2.c: Likewise.
	* g++.dg/warn/Wsizeof-pointer-memaccess-1.C: Likewise.
	* gcc.dg/Wsizeof-pointer-memaccess1.c: Likewise.
	* g++.dg/torture/Wsizeof-pointer-memaccess1.C: Likewise.
	* g++.dg/torture/Wsizeof-pointer-memaccess2.C: Likewise.
	* gcc.dg/torture/Wsizeof-pointer-memaccess1.c: Likewise.
	* c-c++-common/sizeof-array-argument.c: New test.
	* gcc.dg/vla-5.c: Add dg-warnings.
../libgomp/	* testsuite/libgomp.c/appendix-a/a.29.1.c (f): Add dg-warnings.

From-SVN: r212312