[Bug c++/97918] [8/9/10/11 Regression] ICE near htab_hash_string when LTO, -O & -g

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97918

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:89d9c634dc5c10b499c23297ef70133066946790

commit r11-5214-g89d9c634dc5c10b499c23297ef70133066946790
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Nov 20 15:20:45 2020 -0500

    dwarf2: ICE with local class in unused function [PR97918]

    Here, since we only mention bar<B>, we never emit debug information for it.
    But we do emit debug information for H<J>::h, so we need to refer to the
    debug info for bar<B>::J even though there is no bar<B>.  We deal with this
    sort of thing in dwarf2out with the limbo_die_list; parentless dies like J
    get attached to the CU at EOF.  But here, we were flushing the limbo list,
    then generating the template argument DIE for H<J> that refers to J, which
    adds J to the limbo list, too late to be flushed.  So let's flush a little
    later.

    gcc/ChangeLog:

            PR c++/97918
            * dwarf2out.c (dwarf2out_early_finish): flush_limbo_die_list
            after gen_scheduled_generic_parms_dies.

    gcc/testsuite/ChangeLog:

            PR c++/97918
            * g++.dg/debug/localclass2.C: New test.