2010-02-20  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR c++/35669
	* c.opt (Wconversion-null): New option.
	* doc/invoke.texi (Wconversion-null): Document.

cp/
	* call.c (conversion_null_warnings): Replace -Wconversion with
	-Wconversion-null.
	* cvt.c (build_expr_type_conversion): Likewise.

testsuite/
	* g++.dg/warn/Wconversion2.C: Replace -Wconversion with
	-Wconversion-null.
	* g++.dg/warn/Wconversion-null.C: New test.
	* g++.old-deja/g++.other/null1.C: Move to...
	* g++.dg/warn/Wconversion-null-2.C: ... here. Remove -Wconversion.

libstdc++-v3/	
	* testsuite/18_support/headers/cstddef/macros.cc: Add
	-Wno-conversion-null.

From-SVN: r156928