[Bug debug/85252] New: Segmentation fault with -g for static zero-length array initialization

["themos.tsikas at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85252

            Bug ID: 85252
           Summary: Segmentation fault with -g for static zero-length
                    array initialization
           Product: gcc
           Version: 7.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: themos.tsikas at gmail dot com
  Target Milestone: ---

A one-liner source provokes Segmentation fault (you can see the source line in
the message below). Bug shows up in 4.x 5.x 6.x 7.x series of compilers.


$ /opt/gcc-7/bin/gcc -c -g bug.c
bug.c: In function ‘xxx’:
bug.c:1:1: internal compiler error: Segmentation fault
 void xxx(){static char a[0] = ""; return;}
 ^~~~
0xa0d9ff crash_signal
        /scratch/themos/pi/gcc-7-src/gcc/toplev.c:337
0xc18940 tree_int_cst_sgn(tree_node const*)
        /scratch/themos/pi/gcc-7-src/gcc/tree.c:7373
0xc19e8b compare_tree_int(tree_node const*, unsigned long)
        /scratch/themos/pi/gcc-7-src/gcc/tree.c:7583
0x71d59d rtl_for_decl_init
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:18740
0x71d781 rtl_for_decl_location
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:19013
0x753759 add_location_or_const_value_attribute
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:19134
0x7547f2 gen_variable_die
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:22941
0x73ce2b gen_decl_die
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:25398
0x7400e8 process_scope_var
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:24870
0x7402bf decls_for_scope
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:24895
0x740a87 gen_subprogram_die
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:22452
0x73cd28 gen_decl_die
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:25331
0x73d9de dwarf2out_decl
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:25840
0x73ddfe dwarf2out_function_decl
        /scratch/themos/pi/gcc-7-src/gcc/dwarf2out.c:25855
0x7a36fa rest_of_handle_final
        /scratch/themos/pi/gcc-7-src/gcc/final.c:4520
0x7a36fa execute
        /scratch/themos/pi/gcc-7-src/gcc/final.c:4562
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.