re PR fortran/77420 (gfortran and equivalence produces internal compiler error)

2016-09-26  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/77420
	* trans-common.c:  Handle array elements in equivalence when
	the lower and upper bounds of array spec are NULL.
 
2016-09-26  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/77420
	* gfortran.dg/pr77420_1.f90: New test.
	* gfortran.dg/pr77420_2.f90: Ditto.
	* gfortran.dg/pr77420_3.f90: New test. Requires ...
	* gfortran.dg/pr77420_4.f90: this file.

From-SVN: r240506

gcc/fortran/ChangeLog

+2016-09-26  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/77420
+	* trans-common.c:  Handle array elements in equivalence when
+	the lower and upper bounds of array spec are NULL.
+
 2016-09-26  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/48298

gcc/fortran/trans-common.c

@@ -805,13 +805,21 @@ element_number (gfc_array_ref *ar)
       if (ar->dimen_type[i] != DIMEN_ELEMENT)
         gfc_internal_error ("element_number(): Bad dimension type");
 
-      mpz_sub (n, *get_mpz (ar->start[i]), *get_mpz (as->lower[i]));
+      if (as && as->lower[i])
+	mpz_sub (n, *get_mpz (ar->start[i]), *get_mpz (as->lower[i]));
+      else
+	mpz_sub_ui (n, *get_mpz (ar->start[i]), 1);
  
       mpz_mul (n, n, multiplier);
       mpz_add (offset, offset, n);
  
-      mpz_sub (extent, *get_mpz (as->upper[i]), *get_mpz (as->lower[i]));
-      mpz_add_ui (extent, extent, 1);
+      if (as && as->upper[i] && as->lower[i])
+	{
+	  mpz_sub (extent, *get_mpz (as->upper[i]), *get_mpz (as->lower[i]));
+	  mpz_add_ui (extent, extent, 1);
+	}
+      else
+	mpz_set_ui (extent, 0);
  
       if (mpz_sgn (extent) < 0)
         mpz_set_ui (extent, 0);

gcc/testsuite/ChangeLog

+2016-09-26  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/77420
+	* gfortran.dg/pr77420_1.f90: New test.
+	* gfortran.dg/pr77420_2.f90: Ditto.
+	* gfortran.dg/pr77420_3.f90: New test. Requires ...
+	* gfortran.dg/pr77420_4.f90: this file.
+
 2016-09-26  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
 	PR middle-end/77719

gcc/testsuite/gfortran.dg/pr77420_1.f90

+! { dg-do compile }
+module test_equivalence
+  real, private :: array1(100)
+  real, private :: array2(100)
+  equivalence(array1(3),array2(3))
+end module test_equivalence
+
+module mymodule
+  use test_equivalence
+  real, dimension(:), allocatable :: array1
+end module mymodule
+
+program test
+  use mymodule
+end program test

gcc/testsuite/gfortran.dg/pr77420_2.f90

+! { dg-do compile }
+module test_equivalence
+  real, private :: array1(100)
+  real, private :: array2(100)
+  equivalence(array1,array2)
+end module test_equivalence
+
+module mymodule
+  use test_equivalence
+  real, dimension(:), allocatable :: array1
+end module mymodule
+
+program test
+  use mymodule
+end program test

gcc/testsuite/gfortran.dg/pr77420_3.f90

+! { dg-do link }
+! { dg-additional-sources pr77420_4.f90 }
+!
+module h5global
+  implicit none
+  integer :: h5p_default_f, h5p_flags
+  equivalence(h5p_flags, h5p_default_f)
+end module h5global
+! { dg-final { cleanup-modules "h5global" } }

gcc/testsuite/gfortran.dg/pr77420_4.f90

+! { dg-do compile { target { ! *-*-* } } }
+!
+program bug
+  use H5GLOBAL
+  implicit none
+  integer :: i
+  i=H5P_DEFAULT_F
+end program bug