PR c/48062
	* c-decl.c (warn_if_shadowing): Call inform instead of warning_at.
	Print note only if the warning was printed.

	* gcc.dg/Wshadow-1.c: Use dg-message for "shadowed declaration".
	* gcc.dg/Wshadow-3.c: Likewise.
	* gcc.dg/pr48062.c: New test.

From-SVN: r211254