https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109164
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:0a846340b99675d57fc2f2923a0412134eed09d3 commit r13-6764-g0a846340b99675d57fc2f2923a0412134eed09d3 Author: Jakub Jelinek <ja...@redhat.com> Date: Mon Mar 20 20:29:47 2023 +0100 c++: Drop TREE_READONLY on vars (possibly) initialized by tls wrapper [PR109164] The following two testcases are miscompiled, because we keep TREE_READONLY on the vars even when they are (possibly) dynamically initialized by a TLS wrapper function. Normally cp_finish_decl drops TREE_READONLY from vars which need dynamic initialization, but for TLS we do this kind of initialization upon every access to those variables. Keeping them TREE_READONLY means e.g. PRE can hoist loads from those before loops which contain the TLS wrapper calls, so we can access the TLS variables before they are initialized. 2023-03-20 Jakub Jelinek <ja...@redhat.com> PR c++/109164 * cp-tree.h (var_needs_tls_wrapper): Declare. * decl2.cc (var_needs_tls_wrapper): No longer static. * decl.cc (cp_finish_decl): Clear TREE_READONLY on TLS variables for which a TLS wrapper will be needed. * g++.dg/tls/thread_local13.C: New test. * g++.dg/tls/thread_local13-aux.cc: New file. * g++.dg/tls/thread_local14.C: New test. * g++.dg/tls/thread_local14-aux.cc: New file.
