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
