[Bug fortran/107819] ICE in gfc_check_argument_var_dependency, at fortran/dependency.cc:978

[anlauf at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107819

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-11-22
           Keywords|                            |ice-on-invalid-code,
                   |                            |ice-on-valid-code
     Ever confirmed|0                           |1
                 CC|                            |anlauf at gcc dot gnu.org

--- Comment #2 from anlauf at gcc dot gnu.org ---
Confirmed.

Potential patch:

diff --git a/gcc/fortran/trans-stmt.cc b/gcc/fortran/trans-stmt.cc
index fd6d294147e..b288f1f9050 100644
--- a/gcc/fortran/trans-stmt.cc
+++ b/gcc/fortran/trans-stmt.cc
@@ -264,6 +264,7 @@ gfc_conv_elemental_dependencies (gfc_se * se, gfc_se *
loopse,
       if (e->expr_type == EXPR_VARIABLE
            && e->rank && fsym
            && fsym->attr.intent != INTENT_IN
+           && !fsym->attr.value
            && gfc_check_fncall_dependency (e, fsym->attr.intent,
                                            sym, arg0, check_variable))
        {

Note that we get a (correct) warning for z1 after this fix:

pr107819-z1.f90:4:10-16:

    4 |   call s (a(n), a)
      |          2     1
Warning: INTENT(OUT) actual argument at (1) might interfere with actual
argument at (2).