https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89543
Bug ID: 89543
Summary: Don't modify TREE_NO_WARNING during folding in place
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-checking, ice-on-valid-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
CC: marxin at gcc dot gnu.org, tschwinge at gcc dot gnu.org
Depends on: 89503
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Build: x86_64-pc-linux-gnu
+++ This bug was initially created as a clone of Bug #89503 +++
As discussed in https://gcc.gnu.org/ml/gcc-patches/2019-03/msg00013.html and
surrounding thread, it might be a good idea not to modify TREE_NO_WARNING flags
in-place during folding, but instead unshare whatever trees surround it.
In that case the PR89503 change can be reverted.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89503
[Bug 89503] Checking ICE in 'gcc.dg/warn-strlen-no-nul.c'
