alias.c (get_alias_set): Be ready for TYPE_CANONICAL of ptr_type_node to not be ptr_to_node.

	* alias.c (get_alias_set): Be ready for TYPE_CANONICAL
	of ptr_type_node to not be ptr_to_node.
	* tree.c (gimple_types_compatible_p): Do not match TREE_CODE of
	TREE_TYPE of pointers.
	* gimple-expr.c (useless_type_conversion): Reorder the check for
	function pointers and TYPE_CANONICAL.
	* lto.c (hash_canonical_type): Do not hash TREE_CODE of TREE_TYPE of
	pointers.
	* gfortran.dg/lto/bind_c-1_0.f90: New testcase.
	* gfortran.dg/lto/bind_c-1_1.c: New testcase.
	* gcc.dg/lto/c-compatible-types_0.c: Rename to ...
	* gcc.dg/lto/c-compatible-types-1_0.c: this one; fix template
	* gcc.dg/lto/c-compatible-types_1.c: Rename to ...
	* gcc.dg/lto/c-compatible-types-1_1.c: this one; harden for
	-fshort-enum.

From-SVN: r224201

gcc/ChangeLog

+2015-06-06  Jan Hubicka  <hubicka@ucw.cz>
+
+	* alias.c (get_alias_set): Be ready for TYPE_CANONICAL
+	of ptr_type_node to not be ptr_to_node.
+	* tree.c (gimple_types_compatible_p): Do not match TREE_CODE of
+	TREE_TYPE of pointers.
+	* gimple-expr.c (useless_type_conversion): Reorder the check for
+	function pointers and TYPE_CANONICAL.
+
 2015-06-06  John David Anglin  <danglin@gcc.gnu.org>
 
 	PR bootstrap/66319

gcc/alias.c

@@ -1072,8 +1072,9 @@ get_alias_set (tree t)
     }
   /* In LTO the rules above needs to be part of canonical type machinery.
      For now just punt.  */
-  else if (POINTER_TYPE_P (t) && t != ptr_type_node && in_lto_p)
-    set = get_alias_set (ptr_type_node);
+  else if (POINTER_TYPE_P (t)
+	   && t != TYPE_CANONICAL (ptr_type_node) && in_lto_p)
+    set = get_alias_set (TYPE_CANONICAL (ptr_type_node));
 
   /* Otherwise make a new alias set for this type.  */
   else

gcc/gimple-expr.c

@@ -84,6 +84,12 @@ useless_type_conversion_p (tree outer_type, tree inner_type)
       if (TYPE_ADDR_SPACE (TREE_TYPE (outer_type))
 	  != TYPE_ADDR_SPACE (TREE_TYPE (inner_type)))
 	return false;
+      /* Do not lose casts to function pointer types.  */
+      if ((TREE_CODE (TREE_TYPE (outer_type)) == FUNCTION_TYPE
+	   || TREE_CODE (TREE_TYPE (outer_type)) == METHOD_TYPE)
+	  && !(TREE_CODE (TREE_TYPE (inner_type)) == FUNCTION_TYPE
+	       || TREE_CODE (TREE_TYPE (inner_type)) == METHOD_TYPE))
+	return false;
     }
 
   /* From now on qualifiers on value types do not matter.  */
@@ -142,13 +148,6 @@ useless_type_conversion_p (tree outer_type, tree inner_type)
   else if (POINTER_TYPE_P (inner_type)
 	   && POINTER_TYPE_P (outer_type))
     {
-      /* Do not lose casts to function pointer types.  */
-      if ((TREE_CODE (TREE_TYPE (outer_type)) == FUNCTION_TYPE
-	   || TREE_CODE (TREE_TYPE (outer_type)) == METHOD_TYPE)
-	  && !(TREE_CODE (TREE_TYPE (inner_type)) == FUNCTION_TYPE
-	       || TREE_CODE (TREE_TYPE (inner_type)) == METHOD_TYPE))
-	return false;
-
       /* We do not care for const qualification of the pointed-to types
 	 as const qualification has no semantic value to the middle-end.  */
 

gcc/lto/ChangeLog

+2015-06-06  Jan Hubicka  <hubicka@ucw.cz>
+
+	* lto.c (hash_canonical_type): Do not hash TREE_CODE of TREE_TYPE of
+	pointers.
+
 2015-06-05  Aldy Hernandez  <aldyh@redhat.com>
 
 	* lto-lang.c (lto_write_globals): Remove.

gcc/lto/lto.c

@@ -337,12 +337,12 @@ hash_canonical_type (tree type)
   if (TREE_CODE (type) == COMPLEX_TYPE)
     hstate.add_int (TYPE_UNSIGNED (type));
 
-  /* For pointer and reference types, fold in information about the type
-     pointed to but do not recurse to the pointed-to type.  */
+  /* Fortran standard define C_PTR type that is compatible with every
+     C pointer.  For this reason we need to glob all pointers into one.
+     Still pointers in different address spaces are not compatible.  */
   if (POINTER_TYPE_P (type))
     {
       hstate.add_int (TYPE_ADDR_SPACE (TREE_TYPE (type)));
-      hstate.add_int (TREE_CODE (TREE_TYPE (type)));
     }
 
   /* For integer types hash only the string flag.  */

gcc/testsuite/ChangeLog

+2015-06-06  Jan Hubicka  <hubicka@ucw.cz>
+
+	* gfortran.dg/lto/bind_c-1_0.f90: New testcase.
+	* gfortran.dg/lto/bind_c-1_1.c: New testcase.
+	* gcc.dg/lto/c-compatible-types_0.c: Rename to ...
+	* gcc.dg/lto/c-compatible-types-1_0.c: this one; fix template
+	* gcc.dg/lto/c-compatible-types_1.c: Rename to ...
+	* gcc.dg/lto/c-compatible-types-1_1.c: this one; harden for
+	-fshort-enum.
+
 2015-06-06  Thomas Koenig  <tkoenig@netcologne.de>
 
 	PR fortran/47659

gcc/testsuite/gcc.dg/lto/c-compatible-types_0.c → gcc/testsuite/gcc.dg/lto/c-compatible-types-1_0.c

-/* { dg-do run } */
-/* { dg-options "-O3" } */
-/* { dg-skip-if "require -fno-short-enums to work" {target short_enums} } */
+/* { dg-lto-do run } */
+/* { dg-lto-options "-O3" } */
 
 /* By C standard Each enumerated type shall be compatible with char, a  signed
    integer, type, or an unsigned integer type. The choice of type is

gcc/testsuite/gcc.dg/lto/c-compatible-types_1.c → gcc/testsuite/gcc.dg/lto/c-compatible-types-1_1.c

-enum a {test1, test2};
+#include <limits.h>
+enum a {test1, test2, test3=INT_MAX};
 enum a a;
 enum a *b;
 

gcc/testsuite/gfortran.dg/lto/bind_c-1_0.f90

+! { dg-do run }
+! { dg-lto-options {{ -O3 -flto }} }
+! This testcase will abort if C_PTR is not interoperable with both int *
+! and float *
+module lto_type_merge_test
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+  type, bind(c) :: MYFTYPE_1
+     type(c_ptr) :: ptr
+     type(c_ptr) :: ptrb
+  end type MYFTYPE_1
+
+  type(myftype_1), bind(c, name="myVar") :: myVar
+
+contains
+  subroutine types_test() bind(c)
+    myVar%ptr = myVar%ptrb
+  end subroutine types_test
+end module lto_type_merge_test
+

gcc/testsuite/gfortran.dg/lto/bind_c-1_1.c

+#include <stdlib.h>
+/* interopse with myftype_1 */
+typedef struct {
+   float *ptr;
+   int *ptr2;
+} myctype_t;
+
+
+extern void abort(void);
+void types_test(void);
+/* declared in the fortran module */
+extern myctype_t myVar;
+
+int main(int argc, char **argv)
+{
+   myctype_t *cptr;
+   asm("":"=r"(cptr):"0"(&myVar));
+   cptr->ptr = (float *)(size_t) (void *)1;
+   cptr->ptr2 = (int *)(size_t) (void *)2;
+
+   types_test();
+
+   if(cptr->ptr != (float *)(size_t) (void *)2)
+      abort();
+   if(cptr->ptr2 != (int *)(size_t) (void *)2)
+      abort();
+   myVar.ptr2 = (int *)(size_t) (void *)3;
+   types_test();
+
+   if(myVar.ptr != (float *)(size_t) (void *)3)
+      abort();
+   if(myVar.ptr2 != (int *)(size_t) (void *)3)
+      abort();
+   return 0;
+}
+

gcc/tree.c

@@ -12958,18 +12958,14 @@ gimple_canonical_types_compatible_p (const_tree t1, const_tree t2,
 	  && TYPE_STRING_FLAG (t1) != TYPE_STRING_FLAG (t2))
 	return false;
 
-      /* For canonical type comparisons we do not want to build SCCs
-	 so we cannot compare pointed-to types.  But we can, for now,
-	 require the same pointed-to type kind and match what
-	 useless_type_conversion_p would do.  */
+      /* Fortran standard define C_PTR type that is compatible with every
+ 	 C pointer.  For this reason we need to glob all pointers into one.
+	 Still pointers in different address spaces are not compatible.  */
       if (POINTER_TYPE_P (t1))
 	{
 	  if (TYPE_ADDR_SPACE (TREE_TYPE (t1))
 	      != TYPE_ADDR_SPACE (TREE_TYPE (t2)))
 	    return false;
-
-	  if (TREE_CODE (TREE_TYPE (t1)) != TREE_CODE (TREE_TYPE (t2)))
-	    return false;
 	}
 
       /* Tail-recurse to components.  */