1 files changed, 36 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/append_1.f90 b/gcc/testsuite/gfortran.dg/append_1.f90
new file mode 100644
index 000000000..8b81bc384
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/append_1.f90
@@ -0,0 +1,36 @@
+! PR libfortran/21471
+! Testing POSITION="APPEND"
+!
+! { dg-do run }
+      subroutine failed
+        close (10,status='delete')
+        call abort
+      end subroutine failed
+
+      integer,parameter :: n = 13
+      integer :: i, j, error
+
+      open (10, file='foo')
+      close (10)
+
+      do i = 1, n
+        open (10, file='foo',position='append')
+        write (10,*) i
+        close (10)
+      end do
+
+      open (10,file='foo',status='old')
+      error = 0
+      i = -1
+      do while (error == 0)
+        i = i + 1
+        read (10,*,iostat=error) j
+        if (error == 0) then
+          if (i + 1 /= j) call failed
+        end if
+        if (i > n + 1) call failed
+      end do
+      if (i /= n) call failed
+      close (10,status='delete')
+      end
+