re PR c++/44277 ([C++0x] Add warning to facilitate nullptr conversion.)

/cp
2011-11-01  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/44277
	* cvt.c (cp_convert_to_pointer): Warn for zero as null pointer
	constant.
	* typeck.c (cp_truthvalue_conversion): Handle pointers and member
	function pointers under c_inhibit_evaluation_warnings; use
	nullptr_node for data member pointers.
	(cp_build_binary_op): Tweak, just forward to cp_convert op1,
	either a nullptr_node or an integer_zero_node.
	(build_ptrmemfunc): Use nullptr_node.
	* init.c (build_zero_init_1): Likewise.

/c-family
2011-11-01  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/44277
	* c.opt: Add Wzero-as-null-pointer-constant.

/gcc
2011-11-01  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/44277
	* doc/invoke.texi: Document -Wzero-as-null-pointer-constant.

/testsuite
2011-11-01  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/44277
	* g++.dg/warn/Wzero-as-null-pointer-constant-1.C: New.
	* g++.dg/cpp0x/Wzero-as-null-pointer-constant-1.C: Likewise.

From-SVN: r180750