re PR fortran/86116 (Ambiguous generic interface not recognised)

2018-08-14  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/86116
	* interface.c (compare_type): Remove a CLASS/TYPE check.
	(compare_type_characteristics): New function that behaves like the old
	'compare_type'.
	(gfc_check_dummy_characteristics, gfc_check_result_characteristics):
	Call 'compare_type_characteristics' instead of 'compare_type'.

2018-08-14  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/86116
	* gfortran.dg/generic_34.f90: New test case.

From-SVN: r263540

gcc/fortran/ChangeLog

+2018-08-14  Janus Weil  <janus@gcc.gnu.org>
+
+	PR fortran/86116
+	* interface.c (compare_type): Remove a CLASS/TYPE check.
+	(compare_type_characteristics): New function that behaves like the old
+	'compare_type'.
+	(gfc_check_dummy_characteristics, gfc_check_result_characteristics):
+	Call 'compare_type_characteristics' instead of 'compare_type'.
+
 2018-08-12  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/66679

gcc/fortran/interface.c

@@ -735,13 +735,20 @@ compare_type (gfc_symbol *s1, gfc_symbol *s2)
   if (s2->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
     return true;
 
+  return gfc_compare_types (&s1->ts, &s2->ts) || s2->ts.type == BT_ASSUMED;
+}
+
+
+static bool
+compare_type_characteristics (gfc_symbol *s1, gfc_symbol *s2)
+{
   /* TYPE and CLASS of the same declared type are type compatible,
      but have different characteristics.  */
   if ((s1->ts.type == BT_CLASS && s2->ts.type == BT_DERIVED)
       || (s1->ts.type == BT_DERIVED && s2->ts.type == BT_CLASS))
     return false;
 
-  return gfc_compare_types (&s1->ts, &s2->ts) || s2->ts.type == BT_ASSUMED;
+  return compare_type (s1, s2);
 }
 
 
@@ -1309,7 +1316,8 @@ gfc_check_dummy_characteristics (gfc_symbol *s1, gfc_symbol *s2,
   /* Check type and rank.  */
   if (type_must_agree)
     {
-      if (!compare_type (s1, s2) || !compare_type (s2, s1))
+      if (!compare_type_characteristics (s1, s2)
+	  || !compare_type_characteristics (s2, s1))
 	{
 	  snprintf (errmsg, err_len, "Type mismatch in argument '%s' (%s/%s)",
 		    s1->name, gfc_typename (&s1->ts), gfc_typename (&s2->ts));
@@ -1528,7 +1536,7 @@ gfc_check_result_characteristics (gfc_symbol *s1, gfc_symbol *s2,
     return true;
 
   /* Check type and rank.  */
-  if (!compare_type (r1, r2))
+  if (!compare_type_characteristics (r1, r2))
     {
       snprintf (errmsg, err_len, "Type mismatch in function result (%s/%s)",
 		gfc_typename (&r1->ts), gfc_typename (&r2->ts));

gcc/testsuite/ChangeLog

+2018-08-14  Janus Weil  <janus@gcc.gnu.org>
+
+	PR fortran/86116
+	* gfortran.dg/generic_34.f90: New test case.
+
 2018-08-13  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/57891

gcc/testsuite/gfortran.dg/generic_34.f90

+! { dg-do compile }
+!
+! PR 86116: [6/7/8/9 Regression] Ambiguous generic interface not recognised
+!
+! Contributed by martin <mscfd@gmx.net>
+
+module mod
+
+   type :: t
+   end type t
+
+   interface sub
+      module procedure s1
+      module procedure s2
+   end interface
+
+contains
+
+   subroutine s1(x)  ! { dg-error "Ambiguous interfaces in generic interface" }
+      type(t) :: x
+   end subroutine
+
+   subroutine s2(x)  ! { dg-error "Ambiguous interfaces in generic interface" }
+      class(*), allocatable :: x
+   end subroutine
+
+end