https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61848
--- Comment #21 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Author: trippels Date: Fri Oct 17 05:10:07 2014 New Revision: 216361 URL: https://gcc.gnu.org/viewcvs?rev=216361&root=gcc&view=rev Log: Fix pr61848, linux kernel miscompile This patch cures the linux kernel boot failure when compiled using trunk gcc. At its heart, the problem is caused by merge_decls merging from the old decl to the new decl, then copying back to the old decl and discarding the new. When Jan moved some fields to the symtab, "copying back to the old decl" was lost for those fields. Really, it would be best if merge_decls was rewritten to merge everything to the kept decl, but here I'm just doing that for fields accessed via decl_with_vis.symtab_node. 2014-10-17 Alan Modra <amo...@gmail.com> gcc/c/ PR middle-end/61848 * c-decl.c (merge_decls): Don't merge section name or tls model to newdecl symtab node, instead merge to olddecl. Override existing olddecl section name. Set tls_model for all thread-local vars, not just OMP thread-private ones. Remove incorrect comment. gcc/cp/ PR middle-end/61848 * decl.c (merge_decls): Don't merge section name, comdat group or tls model to newdecl symtab node, instead merge to olddecl. Override existing olddecl section name. Set tls_model for all thread-local vars, not just OMP thread-private ones. Remove incorrect comment. 2014-10-17 Markus Trippelsdorf <mar...@trippelsdorf.de> PR middle-end/61848 * g++.dg/torture/pr61848.C: New testcase. * gcc.c-torture/compile/pr61848.c: New testcase. Added: trunk/gcc/testsuite/g++.dg/torture/pr61848.C trunk/gcc/testsuite/gcc.c-torture/compile/pr61848.c Modified: trunk/gcc/ChangeLog trunk/gcc/c/c-decl.c trunk/gcc/cp/ChangeLog trunk/gcc/cp/decl.c trunk/gcc/testsuite/ChangeLog
