https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113976
--- Comment #17 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:64a7a19112f04a548ebe18ada80b8c2d18997c3e commit r12-11193-g64a7a19112f04a548ebe18ada80b8c2d18997c3e Author: Jakub Jelinek <ja...@redhat.com> Date: Wed Feb 28 23:20:13 2024 +0100 c++: Fix explicit instantiation of const variable templates after earlier implicit instantation [PR113976] Already previously instantiated const variable templates had cp_apply_type_quals_to_decl called when they were instantiated, but if they need runtime initialization, their TREE_READONLY flag has been subsequently cleared. Explicit variable template instantiation calls grokdeclarator which calls cp_apply_type_quals_to_decl on them again, setting TREE_READONLY flag again, but nothing clears it afterwards, so we emit such instantiations into rodata sections and segfault when the dynamic initialization attempts to initialize them. The following patch fixes that by not calling cp_apply_type_quals_to_decl on already instantiated variable declarations. 2024-02-28 Jakub Jelinek <ja...@redhat.com> Patrick Palka <ppa...@redhat.com> PR c++/113976 * decl.cc (grokdeclarator): Don't call cp_apply_type_quals_to_decl on DECL_TEMPLATE_INSTANTIATED VAR_DECLs. * g++.dg/cpp1y/var-templ87.C: New test. (cherry picked from commit 29ac92436aa5c702e9e02c206e7590ebd806398e)
