[PATCH] Move the -Wnonnull compare against NULL warning from FEs to early uninit under -Wnonnull-compare (PR c/69835)

[Jakub Jelinek]

On Tue, Feb 16, 2016 at 07:21:49PM +0100, Jakub Jelinek wrote:
> I'm already bootstrapping/regtesting following variant.
> 
> 2016-02-16  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR c/69835
> 	* common.opt (Wnonnull-compare): New warning.
> 	* doc/invoke.texi (-Wnonnull): Remove text about comparison
> 	of arguments against NULL.
> 	(-Wnonnull-compare): Document.
> 	* Makefile.in (OBJS): Add gimple-ssa-nonnull-compare.o.
> 	* tree-pass.h (make_pass_warn_nonnull_compare): Declare.
> 	* passes.def (pass_warn_nonnull_compare): Add.
> 	* gimple-ssa-nonnull-compare.c: New file.
> c-family/
> 	* c.opt (Wnonnull-compare): Enable for -Wall.
> c/
> 	* c-typeck.c (build_binary_op): Revert 2015-09-09 change.
> cp/
> 	* typeck.c (cp_build_binary_op): Revert 2015-09-09 change.
> testsuite/
> 	* c-c++-common/nonnull-1.c: Use -Wnonnull-compare instead of
> 	-Wnonnull in dg-options.
> 	* c-c++-common/nonnull-2.c: New test.

Now successfully bootstrapped/regtested on both x86_64-linux and i686-linux.
Ok for trunk?

	Jakub