[Bug c/67330] New: ICE handling weak attributes

[sasha.levin at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67330

            Bug ID: 67330
           Summary: ICE handling weak attributes
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sasha.levin at oracle dot com
  Target Milestone: ---

Created attachment 36248
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36248&action=edit
Preprocessed source

Hi,

I'm seeing the following ICE when compiling the kernel's kernel/sched/core.c:

kernel/sched/core.c:5925:1: note: in expansion of macro ‘DEFINE_PER_CPU’
 DEFINE_PER_CPU(struct sched_domain *, sd_llc);
 ^
0x63552c symtab_node::get(tree_node const*)
        ../../gcc/cgraph.h:370
0x63552c handle_weak_attribute
        ../../gcc/c-family/c-common.c:8332
0x5af16b decl_attributes(tree_node**, tree_node*, int)
        ../../gcc/attribs.c:557
0x5cb3da start_decl(c_declarator*, c_declspecs*, bool, tree_node*)
        ../../gcc/c/c-decl.c:4547
0x61d140 c_parser_declaration_or_fndef
        ../../gcc/c/c-parser.c:1828
0x62168d c_parser_compound_statement_nostart
        ../../gcc/c/c-parser.c:4622
0x621cbe c_parser_compound_statement
        ../../gcc/c/c-parser.c:4533
0x61dc27 c_parser_declaration_or_fndef
        ../../gcc/c/c-parser.c:1966
0x627e1f c_parser_external_declaration
        ../../gcc/c/c-parser.c:1436
0x6286d9 c_parser_translation_unit
        ../../gcc/c/c-parser.c:1323
0x6286d9 c_parse_file()
        ../../gcc/c/c-parser.c:15449
0x684fa2 c_common_parse_file()
        ../../gcc/c-family/c-opts.c:1058
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.


I've bisected it down to:

commit 8e857c4151f8f0aae992f9b5f22ee5b4c1cc1c73  
Author: hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4>  
Date:   Fri Sep 19 23:56:52 2014 +0000  

        PR c++/61825  
        * c-family/c-common.c (handle_alias_ifunc_attribute): Check  
        that visibility change is possible  
        (handle_weakref_attribute): Likewise.  
        * cgraph.h (symtab_node): Add method get_create and  
        field refuse_visibility_changes.  
        (symtab_node::get_create): New method.  
        * fold-const.c (tree_single_nonzero_warnv_p): Use get_create.  
        * varasm.c (mark_weak): Verify that visibility change is  
        possible.  

        * gcc.dg/tree-ssa/nonzero-1.c: Require error to be output.  


    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@215409
138bc75d-0d04-0410-961f-82ee72b054a4

Attached a preprocessed source file.