[Bug breakpoints/26544] linespec.c:3233: internal-error: void decode_line_full (): Assertion `result.size () == 1 || canonical->pre_expanded' failed.

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26544

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Minimal reproducer:
...
$ cat test.c
int
main (void)
{
  return 0;
 L1:
  (void)0;
}
...

Compile with debug info:
...
$ gcc test.c -g
...

Run like this:
...
$ gdb -batch a.out -ex "b main:L1"
linespec.c:3244: internal-error: void decode_line_full(const event_location*,
int, program_space*, symtab*, int, linespec_result*, const char*, const char*):
Assertion `result.size () == 1 || canonical->pre_expanded' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
...

Same result with:
...
$ gdb -batch a.out -ex start -ex "b L1"
...

The problem seems to be a DW_TAG_label without address:
...
 <1><f4>: Abbrev Number: 2 (DW_TAG_subprogram)
    <f5>   DW_AT_name        : main
 <2><115>: Abbrev Number: 3 (DW_TAG_label)
    <116>   DW_AT_name        : L1
    <119>   DW_AT_decl_file   : 1
    <11a>   DW_AT_decl_line   : 5
 <2><11b>: Abbrev Number: 0
...

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