[Bug c/69985] New: [6 Regression] ICE: in linemap_position_for_loc_and_offset, at libcpp/line-map.c:924

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69985

            Bug ID: 69985
           Summary: [6 Regression] ICE: in
                    linemap_position_for_loc_and_offset, at
                    libcpp/line-map.c:924
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

This is a strange ICE.

trippels@gcc2-power8 foo % ~/gcc_test/usr/local/bin/gcc -w -c -Wall
cmds-check.i
cmds-check.c: In function ‘check_chunk_refs’:
cmds-check.c:7849:6: internal compiler error: in
linemap_position_for_loc_and_offset, at libcpp/line-map.c:924
      block_group_rec->flags);
      ^~~~~~~~~~~~~~~
0x110c5cb3 linemap_position_for_loc_and_offset(line_maps*, unsigned int,
unsigned int)
        ../../gcc/libcpp/line-map.c:924

If I move the cmds-check.i file to a different directory gcc no longer ICEs,
so reducing is impossible.

Also seen on OpenSUSE's:
https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:Gcc6/btrfsprogs/standard/ppc64le