[Bug fortran/77429] New: ICE in gfc_check_dependency, at fortran/dependency.c:1261

[gerhard.steinmetz.fortran@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77429

            Bug ID: 77429
           Summary: ICE in gfc_check_dependency, at
                    fortran/dependency.c:1261
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

Affects version 6, 7 at optimization level -Og, -Os, -O1 or higher.
ICE/backtrace when configured with --enable-checking=yes.
Bailed out with official release (--enable-checking=release).
Invalid code :


$ cat z1.f90
program p
   shape(1) = 0
end


$ cat z2.f90
program p
   shape(1,2) = 0
end


$ gfortran-7-20160828 -O0 z1.f90
z1.f90:2:3:

    shape(1) = 0
   1
Error: Non-variable expression in variable definition context (assignment) at
(1)


$ gfortran-7-20160828 -O2 z1.f90
z1.f90:2:3:

    shape(1) = 0
   1
Error: Non-variable expression in variable definition context (assignment) at
(1)
f951: internal compiler error: in gfc_check_dependency, at
fortran/dependency.c:1261
0x7157b3 gfc_check_dependency(gfc_expr*, gfc_expr*, bool)
        ../../gcc/fortran/dependency.c:1261
0x7b181b optimize_assignment
        ../../gcc/fortran/frontend-passes.c:1183
0x7b181b optimize_code
        ../../gcc/fortran/frontend-passes.c:221
0x7b4229 gfc_code_walker(gfc_code**, int (*)(gfc_code**, int*, void*), int
(*)(gfc_expr**, int*, void*), void*)
        ../../gcc/fortran/frontend-passes.c:3397
0x7b5284 optimize_namespace
        ../../gcc/fortran/frontend-passes.c:1005
0x7b5440 gfc_run_passes(gfc_namespace*)
        ../../gcc/fortran/frontend-passes.c:132
0x6efbc7 gfc_resolve(gfc_namespace*)
        ../../gcc/fortran/resolve.c:15608
0x6daeba resolve_all_program_units
        ../../gcc/fortran/parse.c:5849
0x6daeba gfc_parse_file()
        ../../gcc/fortran/parse.c:6101
0x71d3a2 gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:198