[multiple changes]

2015-06-03  Russell Whitesides  <russelldub@gmail.com>
	    Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/40958
	PR fortran/60780
	PR fortran/66377
	* module.c (load_equiv): Add check for loading duplicate EQUIVALENCEs
	from different modules.  Eliminate the pruning of unused
	equivalence-objects


2015-06-03  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/66377
	gfortran.dg/equiv_9.f90: New test.

From-SVN: r224159

gcc/fortran/ChangeLog

@@ -1,3 +1,13 @@
+2015-06-05  Russell Whitesides  <russelldub@gmail.com>
+	    Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/40958
+	PR fortran/60780
+	PR fortran/66377
+	* module.c (load_equiv): Add check for loading duplicate EQUIVALENCEs
+	from different modules.  Eliminate the pruning of unused
+	equivalence-objects
+
 2015-06-04  Thomas Koenig  <tkoenig@netcologne.de>
 
 	PR fortran/58749

gcc/fortran/module.c

@@ -4476,8 +4476,8 @@ load_commons (void)
 static void
 load_equiv (void)
 {
-  gfc_equiv *head, *tail, *end, *eq;
+  gfc_equiv *head, *tail, *end, *eq, *equiv;
-  bool unused;
+  bool duplicate;
 
   mio_lparen ();
   in_load_equiv = true;
@@ -4504,23 +4504,19 @@ load_equiv (void)
 	mio_expr (&tail->expr);
       }
 
-    /* Unused equivalence members have a unique name.  In addition, it
+    /* Check for duplicate equivalences being loaded from different modules */
-       must be checked that the symbols are from the same module.  */
+    duplicate = false;
-    unused = true;
+    for (equiv = gfc_current_ns->equiv; equiv; equiv = equiv->next)
-    for (eq = head; eq; eq = eq->eq)
       {
-	if (eq->expr->symtree->n.sym->module
+	if (equiv->module && head->module
-	      && head->expr->symtree->n.sym->module
+	    && strcmp (equiv->module, head->module) == 0)
-	      && strcmp (head->expr->symtree->n.sym->module,
-			 eq->expr->symtree->n.sym->module) == 0
-	      && !check_unique_name (eq->expr->symtree->name))
 	  {
-	    unused = false;
+	    duplicate = true;
 	    break;
 	  }
       }
 
-    if (unused)
+    if (duplicate)
       {
 	for (eq = head; eq; eq = head)
 	  {

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2015-06-05  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/66377
+	gfortran.dg/equiv_9.f90: New test.
+
+
 2015-06-05  Tom de Vries  <tom@codesourcery.com>
 
 	merge from gomp4 branch:

gcc/testsuite/gfortran.dg/equiv_9.f90

@@ -0,0 +1,22 @@
+! { dg-do run }
+! PR fortran/66377
+!
+module constant
+  integer x1, x2, x3
+  integer x(3)
+  equivalence (x(1),x1), (x2,x(2)), (x3,x(3))
+end module
+
+program test
+  use constant
+  implicit none 
+  x = (/1, 2, 3/)
+  call another()
+end program
+
+subroutine another()
+   use constant, only : x2
+   implicit none
+   if (x2 /= 2) call abort
+end subroutine
+! { dg-final { cleanup-modules "constant" } }