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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/66725] Issue with silent conversion int to char, ICE if int too large
Date: Thu, 02 Jul 2015 21:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66725

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-07-02
                 CC|                            |kargl at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |kargl at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from kargl at gcc dot gnu.org ---
It seems that a type check is missing for STATUS=some_entity.
With this diff (watch cut-n-paste tab corruption),

Index: io.c
===================================================================
--- io.c        (revision 225348)
+++ io.c        (working copy)
@@ -2071,6 +2071,12 @@ gfc_match_open (void)
       static const char *status[] = { "OLD", "NEW", "SCRATCH",
        "REPLACE", "UNKNOWN", NULL };

+      if (open->status->ts.type != BT_CHARACTER)
+       {
+         gfc_error("scalar-default-char-expr required at %C");
+         goto cleanup;
+       } 
+
       if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
                                      open->status->value.character.string,
                                      "OPEN", warn))

I get

% gfc6 -o z aa.f90
aa.f90:2:23:

    open (1, status=257)
                       1
Error: scalar-default-char-expr required at (1)

I suspect the other TAGS need a similar check.