[PATCH] PR 83975 Associate target with non-constant character length

[Janne Blomqvist]

When associating a variable of type character, if the length of the
target isn't known at compile time, generate an error. See PR 83344
for more details.

Regtested on x86_64-pc-linux-gnu, Ok for trunk?

gcc/fortran/ChangeLog:

2018-02-01  Janne Blomqvist  <j...@gcc.gnu.org>

        PR 83975
        PR 83344
        * resolve.c (resolve_assoc_var): Generate an error if
        target length unknown.
---
 gcc/fortran/resolve.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index 9c8ba86..60b9bc3 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -8634,11 +8634,16 @@ resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
       if (!sym->ts.u.cl)
        sym->ts.u.cl = target->ts.u.cl;
 
-      if (!sym->ts.u.cl->length && !sym->ts.deferred
-         && target->expr_type == EXPR_CONSTANT)
-       sym->ts.u.cl->length
-         = gfc_get_int_expr (gfc_charlen_int_kind,
-                             NULL, target->value.character.length);
+      if (!sym->ts.u.cl->length && !sym->ts.deferred)
+       {
+         if (target->expr_type == EXPR_CONSTANT)
+           sym->ts.u.cl->length =
+             gfc_get_int_expr (gfc_charlen_int_kind, NULL,
+                               target->value.character.length);
+         else
+           gfc_error ("Not Implemented: Associate target with type character"
+                      " and non-constant length at %L", &target->where);
+       }
     }
 
   /* If the target is a good class object, so is the associate variable.  */
-- 
2.7.4