Fix ICE in trans_associate_var

2020-03-05  Paul Thomas  <pault@gcc.gnu.org>

	Backport from trunk
	PR fortran/92976
	* match.c (select_type_set_tmp): Variable 'selector' to replace
	select_type_stack->selector. If the selector array spec has
	explicit bounds, make the temporary's bounds deferred.

2020-03-05  Paul Thomas  <pault@gcc.gnu.org>

	Backport from trunk
	PR fortran/92976
	* gfortran.dg/select_type_48.f90 : New test.

4 files changed, 61 insertions, 10 deletions

diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 8fccf0d..b3ccda4 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,11 @@
+2020-03-05  Paul Thomas  <pault@gcc.gnu.org>
+
+	Backport from trunk
+	PR fortran/92976
+	* match.c (select_type_set_tmp): Variable 'selector' to replace
+	select_type_stack->selector. If the selector array spec has
+	explicit bounds, make the temporary's bounds deferred.
+
 2020-02-19  Mark Eggleston  <markeggleston@gcc.gnu.org>
 
 	Backported from mainline
diff --git a/gcc/fortran/match.c b/gcc/fortran/match.c
index efc0c2d..088b69f 100644
--- a/gcc/fortran/match.c
+++ b/gcc/fortran/match.c
@@ -6165,6 +6165,7 @@ select_type_set_tmp (gfc_typespec *ts)
 {
   char name[GFC_MAX_SYMBOL_LEN];
   gfc_symtree *tmp = NULL;
+  gfc_symbol *selector = select_type_stack->selector;
 
   if (!ts)
     {
@@ -6186,22 +6187,27 @@ select_type_set_tmp (gfc_typespec *ts)
       gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
       gfc_add_type (tmp->n.sym, ts, NULL);
 
-      if (select_type_stack->selector->ts.type == BT_CLASS
-	&& select_type_stack->selector->attr.class_ok)
+      if (selector->ts.type == BT_CLASS && selector->attr.class_ok)
 	{
-	  tmp->n.sym->attr.pointer
-		= CLASS_DATA (select_type_stack->selector)->attr.class_pointer;
+	  tmp->n.sym->attr.pointer = CLASS_DATA (selector)->attr.class_pointer;
 
 	  /* Copy across the array spec to the selector.  */
-	  if (CLASS_DATA (select_type_stack->selector)->attr.dimension
-	      || CLASS_DATA (select_type_stack->selector)->attr.codimension)
+	  if (CLASS_DATA (selector)->attr.dimension
+	      || CLASS_DATA (selector)->attr.codimension)
 	    {
 	      tmp->n.sym->attr.dimension
-		    = CLASS_DATA (select_type_stack->selector)->attr.dimension;
+		    = CLASS_DATA (selector)->attr.dimension;
 	      tmp->n.sym->attr.codimension
-		    = CLASS_DATA (select_type_stack->selector)->attr.codimension;
-	      tmp->n.sym->as
-	    = gfc_copy_array_spec (CLASS_DATA (select_type_stack->selector)->as);
+		    = CLASS_DATA (selector)->attr.codimension;
+	      if (CLASS_DATA (selector)->as->type != AS_EXPLICIT)
+		tmp->n.sym->as
+			= gfc_copy_array_spec (CLASS_DATA (selector)->as);
+	      else
+		{
+		  tmp->n.sym->as = gfc_get_array_spec();
+		  tmp->n.sym->as->rank = CLASS_DATA (selector)->as->rank;
+		  tmp->n.sym->as->type = AS_DEFERRED;
+		}
 	    }
     }
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index eca8fc0..ec8328c 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2020-03-05  Paul Thomas  <pault@gcc.gnu.org>
+
+	Backport from trunk
+	PR fortran/92976
+	* gfortran.dg/select_type_48.f90 : New test.
+
 2020-03-04  Martin Sebor  <msebor@redhat.com>
 
 	PR c++/90938
diff --git a/gcc/testsuite/gfortran.dg/select_type_48.f90 b/gcc/testsuite/gfortran.dg/select_type_48.f90
new file mode 100644
index 0000000..d9ad01c
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/select_type_48.f90
@@ -0,0 +1,31 @@
+! { dg-do run }
+!
+! Test the fix for PR92976, in which the TYPE IS statement caused an ICE
+! because of the explicit bounds of 'x'.
+!
+! Contributed by Gerhard Steinmetz  <gscfq@t-online.de>
+!
+program p
+   type t
+      integer :: i
+   end type
+   class(t), allocatable :: c(:)
+   allocate (c, source = [t(1111),t(2222),t(3333)])
+   call s(c)
+   if (sum (c%i) .ne. 3333) stop 1
+contains
+   subroutine s(x)
+      class(t) :: x(2)
+      select type (x)
+! ICE as compiler attempted to assign descriptor to an array
+         type is (t)
+            x%i = 0
+! Make sure that bounds are correctly translated.
+            call counter (x)
+      end select
+   end
+   subroutine counter (arg)
+     type(t) :: arg(:)
+     if (size (arg, 1) .ne. 2) stop 2
+   end
+end