PATCH] Fortran: PR93263 -fno-automatic and RECURSIVE

The use of -fno-automatic should not affect the save attribute of a
recursive procedure. The first test case checks unsaved variables
and the second checks saved variables.

gcc/fortran/ChangeLog

+2020-01-17  Mark Eggleston  <mark.eggleston@codethink.com>
+
+	PR fortran/93236
+	* resolve.c (resolve_types): Declare boolean recursive and set with the
+	value of the recursive attribute of namespace proc_name symbol
+	structure if it exists.  Call gfc_save_all if both flag_automatic and
+	recursive are false or ns->save_all is true.
+
 2020-01-16  Tobias Burnus  <tobias@codesourcery.com>
 
 	PR fortran/93253

gcc/fortran/resolve.c

@@ -17079,6 +17079,7 @@ resolve_types (gfc_namespace *ns)
   gfc_data *d;
   gfc_equiv *eq;
   gfc_namespace* old_ns = gfc_current_ns;
+  bool recursive = ns->proc_name && ns->proc_name->attr.recursive;
 
   if (ns->types_resolved)
     return;
@@ -17132,7 +17133,7 @@ resolve_types (gfc_namespace *ns)
 
   gfc_traverse_ns (ns, resolve_values);
 
-  if (ns->save_all || !flag_automatic)
+  if (ns->save_all || (!flag_automatic && !recursive))
     gfc_save_all (ns);
 
   iter_stack = NULL;

gcc/testsuite/ChangeLog

+2020-01-17  Mark Eggleston  <mark.eggleston@codethink.com>
+	Tobias Burnus  <burnus@gcc.gnu.org>
+
+	PR fortran/93236
+	* gfortran.dg/pr93263_1.f90: New test.
+	* gfortran.dg/pr93263_2.f90: New test.
+
 2020-01-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/93292

gcc/testsuite/gfortran.dg/pr93263_1.f90

+! { dg-do compile }
+! { dg-options "-fno-automatic -fdump-tree-original" }
+!
+! Test contributed by Mark Eggleston  <mark.eggleston@codethink.com>
+
+program main
+  implicit none
+  call check(2)
+end 
+
+recursive subroutine check(n)
+  implicit none
+  integer n, a
+  a = 10
+  print*,"n=",n
+  if (n==1) then
+    a=a-1
+    print*,"assigning a=",a
+  else
+    a=a-2
+    print*,"assigning a=",a
+    call check(n-1)
+  endif
+  print*,"a=",a
+end 
+
+! { dg-final { scan-tree-dump-not "static integer\\(kind=4\\) a" "original" } }
+! { dg-final { scan-tree-dump-not "integer\\(kind=4\\) a" "original" } }
+

gcc/testsuite/gfortran.dg/pr93263_2.f90

+! { dg-do run }
+!
+! Test contributed by Tobias Burnus  <burnus@gcc.gnu.org>
+
+  integer :: cnt
+  cnt = 0
+  call sub()
+  if (cnt /= 5) stop 1
+contains
+  recursive subroutine sub()
+    save
+    logical :: first = .true.
+    integer :: i
+    cnt = cnt + 1
+    if (first) then
+      first = .false.
+      i = 1
+    end if
+    print *, "Hello", i
+    i = i + 1
+    if (i <= 5) call sub()
+  end subroutine
+end
+