obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 59 insertions, 0 deletions

diff --git a/gcc/testsuite/gfortran.dg/duplicate_labels.f90 b/gcc/testsuite/gfortran.dg/duplicate_labels.f90
new file mode 100644
index 000000000..7523d0c41
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/duplicate_labels.f90
@@ -0,0 +1,59 @@
+! { dg-do compile }
+! PR 21257
+program dups
+
+  integer i,j,k
+
+  abc: do i = 1, 3
+  abc:    do j = 1, 3    ! { dg-error "Duplicate construct label" }
+              k = i + j
+          end do abc
+       end do abc        ! { dg-error "Expecting END PROGRAM" }
+
+  xyz: do i = 1, 2
+          k = i + 2
+       end do xyz
+  xyz: do j = 1, 5      ! { dg-error "Duplicate construct label" }
+          k = j + 2
+       end do loop      ! { dg-error "Expecting END PROGRAM" }
+
+  her: if (i == 1) then
+  her:    if (j  == 1) then  ! { dg-error "Duplicate construct label" }
+               k = i + j
+          end if her
+       end if her            ! { dg-error "Expecting END PROGRAM" }
+
+  his: if (i == 1) then
+           i = j
+        end if his
+  his: if (j === 1) then    ! { dg-error "Duplicate construct label" }
+           print *, j
+        end if his          ! { dg-error "Expecting END PROGRAM" }
+
+  sgk: select case (i)
+       case (1)
+  sgk:   select case (j)    ! { dg-error "Duplicate construct label" }
+          case (10)
+             i = i + j
+          case (20)
+             j = j + i
+          end select sgk
+        case (2)             ! { dg-error "Unexpected CASE statement" }
+            i = i + 1
+            j = j + 1
+        end select sgk       ! { dg-error "Expecting END PROGRAM" }
+
+  apl: select case (i)
+         case (1)
+            k = 2
+         case (2)
+            j = 1
+         end select apl
+  apl: select case (i)  ! { dg-error "Duplicate construct label" }
+         case (1)       ! { dg-error "Unexpected CASE statement" }
+            j = 2
+         case (2)       ! { dg-error "Unexpected CASE statement" }
+            k = 1
+         end select apl ! { dg-error "Expecting END PROGRAM" }
+
+end program dups