--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/equiv_7.f90	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,114 @@
+! { dg-do run }
+! { dg-options "-std=gnu" }
+! Tests the fix for PR29786, in which initialization of overlapping
+! equivalence elements caused a compile error.
+!
+! Contributed by Bernhard Fischer <aldot@gcc.gnu.org>
+!
+block data
+  common /global/ ca (4)
+  integer(4) ca, cb
+  equivalence (cb, ca(3))
+  data (ca(i), i = 1, 2) /42,43/, ca(4) /44/
+  data cb /99/
+end block data
+
+  integer(4), parameter :: abcd = ichar ("a") + 256_4 * (ichar("b") + 256_4 * &
+                                 (ichar ("c") + 256_4 * ichar ("d")))
+  logical(4), parameter :: bigendian = transfer (abcd, "wxyz") .eq. "abcd"
+
+  call int4_int4
+  call real4_real4
+  call complex_real
+  call check_block_data
+  call derived_types         ! Thanks to Tobias Burnus for this:)
+!
+! This came up in PR29786 comment #9 - Note the need to treat endianess
+! Thanks Dominique d'Humieres:)
+!
+  if (bigendian) then
+    if (d1mach_little (1) .ne. transfer ((/0_4, 1048576_4/), 1d0)) call abort ()
+    if (d1mach_little (2) .ne. transfer ((/-1_4,2146435071_4/), 1d0)) call abort ()
+  else
+    if (d1mach_big (1) .ne. transfer ((/1048576_4, 0_4/), 1d0)) call abort ()
+    if (d1mach_big (2) .ne. transfer ((/2146435071_4,-1_4/), 1d0)) call abort ()
+  end if 
+!
+contains
+  subroutine int4_int4
+      integer(4)         a(4)
+      integer(4)         b
+      equivalence (b,a(3))
+      data b/3/
+      data (a(i), i=1,2) /1,2/, a(4) /4/
+      if (any (a .ne. (/1, 2, 3, 4/))) call abort ()
+  end subroutine int4_int4
+  subroutine real4_real4
+      real(4)         a(4)
+      real(4)         b
+      equivalence (b,a(3))
+      data b/3.0_4/
+      data (a(i), i=1,2) /1.0_4, 2.0_4/, &
+            a(4) /4.0_4/
+      if (sum (abs (a -  &
+          (/1.0_4, 2.0_4, 3.0_4, 4.0_4/))) > 1.0e-6) call abort ()
+  end subroutine real4_real4
+  subroutine complex_real
+      complex(4)         a(4)
+      real(4)            b(2)
+      equivalence (b,a(3))
+      data b(1)/3.0_4/, b(2)/4.0_4/
+      data (a(i), i=1,2) /(0.0_4, 1.0_4),(2.0_4,0.0_4)/, &
+            a(4) /(0.0_4,5.0_4)/
+      if (sum (abs (a - (/(0.0_4, 1.0_4),(2.0_4, 0.0_4), &
+          (3.0_4, 4.0_4),(0.0_4, 5.0_4)/)))  > 1.0e-6) call abort ()
+  end subroutine complex_real
+  subroutine check_block_data
+      common /global/ ca (4)
+      equivalence (ca(3), cb)
+      integer(4) ca
+      if (any (ca .ne. (/42, 43, 99, 44/))) call abort ()
+  end subroutine check_block_data
+  function d1mach_little(i) result(d1mach)
+    implicit none
+    double precision d1mach,dmach(5)
+    integer i
+    integer*4 large(4),small(4)
+    equivalence ( dmach(1), small(1) )
+    equivalence ( dmach(2), large(1) )
+    data small(1),small(2) / 0,   1048576/
+    data large(1),large(2) /-1,2146435071/
+    d1mach = dmach(i) 
+  end function d1mach_little
+  function d1mach_big(i) result(d1mach)
+    implicit none
+    double precision d1mach,dmach(5)
+    integer i
+    integer*4 large(4),small(4)
+    equivalence ( dmach(1), small(1) )
+    equivalence ( dmach(2), large(1) )
+    data small(1),small(2) /1048576,    0/
+    data large(1),large(2) /2146435071,-1/
+    d1mach = dmach(i) 
+  end function d1mach_big
+    subroutine derived_types
+      TYPE T1
+        sequence
+        character (3) :: chr
+        integer :: i = 1
+        integer :: j
+        END TYPE T1
+      TYPE T2
+        sequence
+        character (3) :: chr = "wxy"
+        integer :: i = 1
+        integer :: j = 4
+      END TYPE T2
+      TYPE(T1) :: a1
+      TYPE(T2) :: a2
+      EQUIVALENCE(a1,a2)         ! { dg-warning="mixed|components" }
+      if (a1%chr .ne. "wxy") call abort ()
+      if (a1%i .ne. 1) call abort ()
+      if (a1%j .ne. 4) call abort ()
+      end subroutine derived_types
+end