https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93949
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-8 branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:a9e9ff7b8a4d10ccf54dd4a641dd55c1b1645e17 commit r8-10111-ga9e9ff7b8a4d10ccf54dd4a641dd55c1b1645e17 Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Feb 27 10:45:30 2020 +0100 gimplify: Don't optimize register const vars to static [PR93949] The following testcase is rejected, while it was accepted in 3.4 and earlier (before tree-ssa merge). The problem is that we decide to promote the const variable to TREE_STATIC, but TREE_STATIC DECL_REGISTER VAR_DECLs may only be the global register vars and so assemble_variable/make_decl_rtl diagnoses it. Either we do what the following patch does, where we could consider register as a hint the user doesn't want such optimization, because if something is forced static, it is not "register" anymore and register static is not valid in C either, or we could clear DECL_REGISTER instead, but would still need to punt at least on DECL_HARD_REGISTER cases. 2020-02-27 Jakub Jelinek <ja...@redhat.com> PR c/93949 * gimplify.c (gimplify_init_constructor): Don't promote readonly DECL_REGISTER variables to TREE_STATIC. * gcc.c-torture/compile/pr93949.c: New test.
