[PATCH] Warn when comparing nonnull arguments to NULL in a function.

[Jakub Jelinek]

On Wed, Sep 09, 2015 at 04:01:07PM -0600, Jeff Law wrote:
> >        * gcc.dg/nonnull-4.c: New test.
> >        * g++.dg/warn/nonnull3.C: Likewise.

If the tests are the same, perhaps stick just one test into
c-c++-common/nonnull-1.c instead?  Also, all the "cp1 compared to NULL"
strings mention cp1, did you mean the second one to mention cp2 and so on?

> Can you also upate the -Wnonnull documentation in invoke.texi to indicate it
> also will warn if it discovers a non-null argument that is compared against
> null?
> 
> With the doc fix and a bootstrap/regression test, this patch ought to be
> fine.

	Jakub