[Bug c/90760] [8/9/10 Regression] ICE on attributes section and alias in set_section, at symtab.c:1573

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90760

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-06-05
                 CC|                            |msebor at gcc dot gnu.org
      Known to work|                            |4.9.4
            Summary|ICE in set_section, at      |[8/9/10 Regression] ICE on
                   |symtab.c:1573               |attributes section and
                   |                            |alias in set_section, at
                   |                            |symtab.c:1573
     Ever confirmed|0                           |1
      Known to fail|                            |10.0, 5.1.0, 6.4.0, 7.3.0,
                   |                            |8.2.0, 9.1.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  Bisection points to r216361 committed into GCC 5.0.0.  GCC 4.9
rejects the code with an error.

r216361 | trippels | 2014-10-17 01:10:07 -0400 (Fri, 17 Oct 2014) | 34 lines

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.