https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101600
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Martin Sebor <mse...@gcc.gnu.org>: https://gcc.gnu.org/g:820f0940d7ace1306430a9dcf1bd9577508a7a7e commit r12-3124-g820f0940d7ace1306430a9dcf1bd9577508a7a7e Author: Martin Sebor <mse...@redhat.com> Date: Tue Aug 24 10:49:11 2021 -0600 Reset PHI base0 flag if it's clear in any argument [PR101977, ...] Resolves: PR middle-end/101600 - Spurious -Warray-bounds downcasting a polymorphic pointer PR middle-end/101977 - bogus -Warray-bounds on a negative index into a parameter in conditional with null gcc/ChangeLog: PR middle-end/101600 PR middle-end/101977 * gimple-ssa-warn-access.cc (maybe_warn_for_bound): Tighten up the phrasing of a warning. (check_access): Use the remaining size after subtracting any offset rather than the whole object size. * pointer-query.cc (access_ref::get_ref): Clear BASE0 flag if it's clear for any nonnull PHI argument. (compute_objsize): Clear argument. gcc/testsuite/ChangeLog: PR middle-end/101600 PR middle-end/101977 * g++.dg/pr100574.C: Prune out valid warning. * gcc.dg/pr20126.c: Same. * gcc.dg/Wstringop-overread.c: Adjust text of expected warnings. Add new instances. * gcc.dg/warn-strnlen-no-nul.c: Same. * g++.dg/warn/Warray-bounds-26.C: New test. * gcc.dg/Warray-bounds-88.c: New test.
