re PR c/16202 (The -Wsequence-point warning misses many important instances)

re PR c/16202 (The -Wsequence-point warning misses many important instances)

2009-04-21  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR 16202
	* c-typeck.c (lvalue_p): Move declaration ...
	* c-common.h (lvalue_p): ... to here.
	* c-common.c (candidate_equal_p): New.
	(add_tlist): Use it.
	(merge_tlist): Use it.
	(warn_for_collisions_1): Likewise.
	(warning_candidate_p): Accept more candidates.
	(verify_tree): A warning candidate can be an expression. Use
	candidate_equal_p.
cp/
	* tree.c (lvalue_p_1): Use const_tree.
	Use CONST_CAST_TREE to avoid warning.
	(lvalue_p): Returns bool, receives const_tree.
testsuite/
	* gcc.dg/sequence-pt-1.c: Remove XFAILs.
	* gcc.dg/sequence-pt-2.c: New.
	* gcc.dg/sequence-pt-3.c: New.
	* g++.dg/warn/sequence-pt-1.C: Remove XFAILs.
	* g++.dg/warn/sequence-pt-2.c: New.
	* g++.dg/warn/sequence-pt-3.c: New.

From-SVN: r146472