PING [PATCH] run -Wnonnull later (PR 87489)

[Martin Sebor]

Ping:
   https://gcc.gnu.org/pipermail/gcc-patches/2021-February/564597.html

On 1/31/21 5:31 PM, Martin Sebor wrote:
> The initial -Wnonnull implementation in the middle end took place
> too late in the pipeline (just before expansion), and as a result
> was prone to false positives (bug 78817).  In an attempt to avoid
> the worst of those, the warning was moved to the ccp2 pass in
> r243874.  However, as the test case in PR 87489 shows, this is
> in turn too early and causes other false positives as a result.
> 
> A few experiments with running the warning later suggest that
> just before the mergephi2 pass is a good point to avoid this class
> of false positives without causing any regressions or introducing
> any new warnings either in Glibc or in Binutils/GDB.
> 
> Since PR 87489 is a GCC 8-11 regression I propose to make this
> change on the trunk as well as on the release branches.
> 
> Martin