tree.c (type_with_interoperable_signedness): New.

	* tree.c (type_with_interoperable_signedness): New.
	(gimple_canonical_types_compatible_p): Use it.
	* tree.h (type_with_interoperable_signedness): Declare

	* lto.c (hash_canonical_type): Honor
	type_with_interoperable_signedness.

	* gfortran.dg/lto/bind_c-2_0.f90: New testcase.
	* gfortran.dg/lto/bind_c-2_1.c: New testcase.
	* gfortran.dg/lto/bind_c-3_0.f90: New testcase.
	* gfortran.dg/lto/bind_c-3_1.c: New testcase.
	* gfortran.dg/lto/bind_c-4_0.f90: New testcase.
	* gfortran.dg/lto/bind_c-4_1.c: New testcase.
	* gfortran.dg/lto/bind_c-5_0.f90: New testcase.
	* gfortran.dg/lto/bind_c-5_1.c: New testcase.

From-SVN: r228680

gcc/lto/ChangeLog

+2015-10-10  Jan Hubicka  <hubicka@ucw.cz>
+
+	* lto.c (hash_canonical_type): Honor
+	type_with_interoperable_signedness.
+
 2015-09-28  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* lto-lang.c (DEF_FUNCTION_TYPE_VAR_6): New.

gcc/lto/lto.c

@@ -288,6 +288,7 @@ static hashval_t
 hash_canonical_type (tree type)
 {
   inchash::hash hstate;
+  enum tree_code code;
 
   /* We compute alias sets only for types that needs them.
      Be sure we do not recurse to something else as we can not hash incomplete
@@ -299,7 +300,8 @@ hash_canonical_type (tree type)
      smaller sets; when searching for existing matching types to merge,
      only existing types having the same features as the new type will be
      checked.  */
-  hstate.add_int (tree_code_for_canonical_type_merging (TREE_CODE (type)));
+  code = tree_code_for_canonical_type_merging (TREE_CODE (type));
+  hstate.add_int (code);
   hstate.add_int (TYPE_MODE (type));
 
   /* Incorporate common features of numerical types.  */
@@ -309,8 +311,9 @@ hash_canonical_type (tree type)
       || TREE_CODE (type) == OFFSET_TYPE
       || POINTER_TYPE_P (type))
     {
-      hstate.add_int (TYPE_UNSIGNED (type));
       hstate.add_int (TYPE_PRECISION (type));
+      if (!type_with_interoperable_signedness (type))
+        hstate.add_int (TYPE_UNSIGNED (type));
     }
 
   if (VECTOR_TYPE_P (type))

gcc/testsuite/ChangeLog

+2015-10-10  Jan Hubicka  <hubicka@ucw.cz>
+
+	* gfortran.dg/lto/bind_c-2_0.f90: New testcase.
+	* gfortran.dg/lto/bind_c-2_1.c: New testcase.
+	* gfortran.dg/lto/bind_c-3_0.f90: New testcase.
+	* gfortran.dg/lto/bind_c-3_1.c: New testcase.
+	* gfortran.dg/lto/bind_c-4_0.f90: New testcase.
+	* gfortran.dg/lto/bind_c-4_1.c: New testcase.
+	* gfortran.dg/lto/bind_c-5_0.f90: New testcase.
+	* gfortran.dg/lto/bind_c-5_1.c: New testcase.
+
 2015-10-09  Steve Ellcey  <sellcey@imgtec.com>
 
 	* gcc.target/mips/mips.exp (mips_option_groups): Add -mframe-header-opt

gcc/testsuite/gfortran.dg/lto/bind_c-2_0.f90

+! { dg-lto-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
+     integer(c_signed_char) :: chr
+     integer(c_signed_char) :: chrb
+  end type MYFTYPE_1
+
+  type(myftype_1), bind(c, name="myVar") :: myVar
+
+contains
+  subroutine types_test() bind(c)
+    myVar%chr = myVar%chrb
+  end subroutine types_test
+end module lto_type_merge_test
+

gcc/testsuite/gfortran.dg/lto/bind_c-2_1.c

+#include <stdlib.h>
+/* interopse with myftype_1 */
+typedef struct {
+   unsigned char chr;
+   signed char chr2;
+} 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 *cchr;
+   asm("":"=r"(cchr):"0"(&myVar));
+   cchr->chr = 1;
+   cchr->chr2 = 2;
+
+   types_test();
+
+   if(cchr->chr != 2)
+      abort();
+   if(cchr->chr2 != 2)
+      abort();
+   myVar.chr2 = 3;
+   types_test();
+
+   if(myVar.chr != 3)
+      abort();
+   if(myVar.chr2 != 3)
+      abort();
+   return 0;
+}
+

gcc/testsuite/gfortran.dg/lto/bind_c-3_0.f90

+! { dg-lto-do run }
+! { dg-lto-options {{ -O3 -flto }} }
+! This testcase will abort if integer types are not interoperable.
+module lto_type_merge_test
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+  type, bind(c) :: MYFTYPE_1
+    integer(c_int) :: val_int
+    integer(c_short) :: val_short
+    integer(c_long) :: val_long
+    integer(c_long_long) :: val_long_long
+    integer(c_size_t) :: val_size_t
+    integer(c_int8_t) :: val_int8_t
+    integer(c_int16_t) :: val_int16_t
+    integer(c_int32_t) :: val_int32_t
+    integer(c_int64_t) :: val_int64_t
+    integer(c_int_least8_t) :: val_intleast_8_t
+    integer(c_int_least16_t) :: val_intleast_16_t
+    integer(c_int_least32_t) :: val_intleast_32_t
+    integer(c_int_least64_t) :: val_intleast_64_t
+    integer(c_int_fast8_t) :: val_intfast_8_t
+    integer(c_int_fast16_t) :: val_intfast_16_t
+    integer(c_int_fast32_t) :: val_intfast_32_t
+    integer(c_int_fast64_t) :: val_intfast_64_t
+    integer(c_intmax_t) :: val_intmax_t
+    integer(c_intptr_t) :: val_intptr_t
+  end type MYFTYPE_1
+
+  type(myftype_1), bind(c, name="myVar") :: myVar
+
+contains
+  subroutine types_test1() bind(c)
+    myVar%val_int = 2
+  end subroutine types_test1
+  subroutine types_test2() bind(c)
+    myVar%val_short = 2
+  end subroutine types_test2
+  subroutine types_test3() bind(c)
+    myVar%val_long = 2
+  end subroutine types_test3
+  subroutine types_test4() bind(c)
+    myVar%val_long_long = 2
+  end subroutine types_test4
+  subroutine types_test5() bind(c)
+    myVar%val_size_t = 2
+  end subroutine types_test5
+  subroutine types_test6() bind(c)
+    myVar%val_int8_t = 2
+  end subroutine types_test6
+  subroutine types_test7() bind(c)
+    myVar%val_int16_t = 2
+  end subroutine types_test7
+  subroutine types_test8() bind(c)
+    myVar%val_int32_t = 2
+  end subroutine types_test8
+  subroutine types_test9() bind(c)
+    myVar%val_int64_t = 2
+  end subroutine types_test9
+  subroutine types_test10() bind(c)
+    myVar%val_intleast_8_t = 2
+  end subroutine types_test10
+  subroutine types_test11() bind(c)
+    myVar%val_intleast_16_t = 2
+  end subroutine types_test11
+  subroutine types_test12() bind(c)
+    myVar%val_intleast_32_t = 2
+  end subroutine types_test12
+  subroutine types_test13() bind(c)
+    myVar%val_intleast_64_t = 2
+  end subroutine types_test13
+  subroutine types_test14() bind(c)
+    myVar%val_intfast_8_t = 2
+  end subroutine types_test14
+  subroutine types_test15() bind(c)
+    myVar%val_intfast_16_t = 2
+  end subroutine types_test15
+  subroutine types_test16() bind(c)
+    myVar%val_intfast_32_t = 2
+  end subroutine types_test16
+  subroutine types_test17() bind(c)
+    myVar%val_intfast_64_t = 2
+  end subroutine types_test17
+  subroutine types_test18() bind(c)
+    myVar%val_intmax_t = 2
+  end subroutine types_test18
+  subroutine types_test19() bind(c)
+    myVar%val_intptr_t = 2
+  end subroutine types_test19
+end module lto_type_merge_test
+

gcc/testsuite/gfortran.dg/lto/bind_c-3_1.c

+#include <stdlib.h>
+#include <stdint.h>
+/* interopse with myftype_1 */
+typedef struct {
+  int val1;
+  short int val2;
+  long int val3;
+  long long int val4;
+  size_t val5;
+  int8_t val6;
+  int16_t val7;
+  int32_t val8;
+  int64_t val9;
+  int_least8_t val10;
+  int_least16_t val11;
+  int_least32_t val12;
+  int_least64_t val13;
+  int_fast8_t val14;
+  int_fast16_t val15;
+  int_fast32_t val16;
+  int_fast64_t val17;
+  intmax_t val18;
+  intptr_t val19;
+} myctype_t;
+
+
+extern void abort(void);
+void types_test1(void);
+void types_test2(void);
+void types_test3(void);
+void types_test4(void);
+void types_test5(void);
+void types_test6(void);
+void types_test7(void);
+void types_test8(void);
+void types_test9(void);
+void types_test10(void);
+void types_test11(void);
+void types_test12(void);
+void types_test13(void);
+void types_test14(void);
+void types_test15(void);
+void types_test16(void);
+void types_test17(void);
+void types_test18(void);
+void types_test19(void);
+/* declared in the fortran module */
+extern myctype_t myVar;
+
+#define test(n)\
+  cchr->val##n = 1; types_test##n (); if (cchr->val##n != 2) abort ();
+
+int main(int argc, char **argv)
+{
+   myctype_t *cchr;
+   asm("":"=r"(cchr):"0"(&myVar));
+   test(1);
+   test(2);
+   test(3);
+   test(4);
+   test(5);
+   test(6);
+   test(7);
+   test(8);
+   test(9);
+   test(10);
+   test(11);
+   test(12);
+   test(13);
+   test(14);
+   test(15);
+   test(16);
+   test(17);
+   test(18);
+   test(19);
+   return 0;
+}
+

gcc/testsuite/gfortran.dg/lto/bind_c-4_0.f90

+! { dg-lto-do run }
+! { dg-lto-options {{ -O3 -flto }} }
+! This testcase will abort if real/complex/boolean/character types are not interoperable
+module lto_type_merge_test
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+  type, bind(c) :: MYFTYPE_1
+    real(c_float) :: val_1
+    real(c_double) :: val_2
+    real(c_long_double) :: val_3
+    complex(c_float_complex) :: val_4
+    complex(c_double_complex) :: val_5
+    complex(c_long_double_complex) :: val_6
+    logical(c_bool) :: val_7
+    !FIXME: Fortran define c_char as array of size 1.
+    !character(c_char) :: val_8
+  end type MYFTYPE_1
+
+  type(myftype_1), bind(c, name="myVar") :: myVar
+
+contains
+  subroutine types_test1() bind(c)
+    myVar%val_1 = 2
+  end subroutine types_test1
+  subroutine types_test2() bind(c)
+    myVar%val_2 = 2
+  end subroutine types_test2
+  subroutine types_test3() bind(c)
+    myVar%val_3 = 2
+  end subroutine types_test3
+  subroutine types_test4() bind(c)
+    myVar%val_4 = 2
+  end subroutine types_test4
+  subroutine types_test5() bind(c)
+    myVar%val_5 = 2
+  end subroutine types_test5
+  subroutine types_test6() bind(c)
+    myVar%val_6 = 2
+  end subroutine types_test6
+  subroutine types_test7() bind(c)
+    myVar%val_7 = myVar%val_7 .or. .not. myVar%val_7
+  end subroutine types_test7
+  !subroutine types_test8() bind(c)
+    !myVar%val_8 = "a"
+  !end subroutine types_test8
+end module lto_type_merge_test
+

gcc/testsuite/gfortran.dg/lto/bind_c-4_1.c

+#include <stdlib.h>
+#include <stdint.h>
+/* interopse with myftype_1 */
+typedef struct {
+  float val1;
+  double val2;
+  long double val3;
+  float _Complex val4;
+  double _Complex val5;
+  long double _Complex val6;
+  _Bool val7;
+  /* FIXME: Fortran define c_char as array of size 1.
+     char val8;  */
+} myctype_t;
+
+
+extern void abort(void);
+void types_test1(void);
+void types_test2(void);
+void types_test3(void);
+void types_test4(void);
+void types_test5(void);
+void types_test6(void);
+void types_test7(void);
+void types_test8(void);
+/* declared in the fortran module */
+extern myctype_t myVar;
+
+#define test(n)\
+  cchr->val##n = 1; types_test##n (); if (cchr->val##n != 2) abort ();
+
+int main(int argc, char **argv)
+{
+   myctype_t *cchr;
+   asm("":"=r"(cchr):"0"(&myVar));
+   test(1);
+   test(2);
+   test(3);
+   test(4);
+   test(5);
+   test(6);
+   cchr->val7 = 0; types_test7 (); if (cchr->val7 != 1) abort ();
+   /*cchr->val8 = 0; types_test8 (); if (cchr->val8 != 'a') abort ();*/
+   return 0;
+}
+

gcc/testsuite/gfortran.dg/lto/bind_c-5_0.f90

+! { dg-lto-do run }
+! { dg-lto-options {{ -O3 -flto }} }
+! This testcase will abort if C_FUNPTR is not interoperable with both int *
+! and float *
+module lto_type_merge_test
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+  type(c_funptr), bind(c, name="myVar") :: myVar
+  type(c_funptr), bind(c, name="myVar2") :: myVar2
+
+contains
+  subroutine types_test() bind(c)
+    myVar = myVar2
+  end subroutine types_test
+end module lto_type_merge_test
+

gcc/testsuite/gfortran.dg/lto/bind_c-5_1.c

+#include <stdlib.h>
+/* declared in the fortran module */
+extern int (*myVar) (int);
+extern float (*myVar2) (float);
+void types_test(void);
+
+
+extern void abort(void);
+
+int main(int argc, char **argv)
+{
+   int (**myptr) (int);
+   float (**myptr2) (float);
+   asm("":"=r"(myptr):"0"(&myVar));
+   asm("":"=r"(myptr2):"0"(&myVar2));
+   *myptr = (int (*) (int)) (size_t) (void *)1;
+   *myptr2 = (float (*) (float)) (size_t) (void *)2;
+   types_test();
+   if (*myptr != (int (*) (int)) (size_t) (void *)2)
+	abort ();
+   if (*myptr2 != (float (*) (float)) (size_t) (void *)2)
+	abort ();
+   *myptr2 = (float (*) (float)) (size_t) (void *)3;
+   types_test();
+   if (*myptr != (int (*) (int)) (size_t) (void *)3)
+	abort ();
+   if (*myptr2 != (float (*) (float)) (size_t) (void *)3)
+	abort ();
+   return 0;
+}
+

gcc/tree.c

@@ -13012,6 +13012,23 @@ verify_type_variant (const_tree t, tree tv)
    back to pointer-comparison of TYPE_CANONICAL for aggregates
    for example.  */
 
+/* Return true if TYPE_UNSIGNED of TYPE should be ignored for canonical
+   type calculation because we need to allow inter-operability between signed
+   and unsigned variants.  */
+
+bool
+type_with_interoperable_signedness (const_tree type)
+{
+  /* Fortran standard require C_SIGNED_CHAR to be interoperable with both
+     signed char and unsigned char.  Similarly fortran FE builds
+     C_SIZE_T as signed type, while C defines it unsigned.  */
+
+  return tree_code_for_canonical_type_merging (TREE_CODE (type))
+	   == INTEGER_TYPE
+         && (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)
+	     || TYPE_PRECISION (type) == TYPE_PRECISION (size_type_node));
+}
+
 /* Return true iff T1 and T2 are structurally identical for what
    TBAA is concerned.  
    This function is used both by lto.c canonical type merging and by the
@@ -13062,8 +13079,8 @@ gimple_canonical_types_compatible_p (const_tree t1, const_tree t2,
     return TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2);
 
   /* Can't be the same type if the types don't have the same code.  */
-  if (tree_code_for_canonical_type_merging (TREE_CODE (t1))
-      != tree_code_for_canonical_type_merging (TREE_CODE (t2)))
+  enum tree_code code = tree_code_for_canonical_type_merging (TREE_CODE (t1));
+  if (code != tree_code_for_canonical_type_merging (TREE_CODE (t2)))
     return false;
 
   /* Qualifiers do not matter for canonical type comparison purposes.  */
@@ -13086,9 +13103,14 @@ gimple_canonical_types_compatible_p (const_tree t1, const_tree t2,
       || TREE_CODE (t1) == OFFSET_TYPE
       || POINTER_TYPE_P (t1))
     {
-      /* Can't be the same type if they have different sign or precision.  */
-      if (TYPE_PRECISION (t1) != TYPE_PRECISION (t2)
-	  || TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2))
+      /* Can't be the same type if they have different recision.  */
+      if (TYPE_PRECISION (t1) != TYPE_PRECISION (t2))
+	return false;
+
+      /* In some cases the signed and unsigned types are required to be
+	 inter-operable.  */
+      if (TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2)
+	  && !type_with_interoperable_signedness (t1))
 	return false;
 
       /* Fortran's C_SIGNED_CHAR is !TYPE_STRING_FLAG but needs to be

gcc/tree.h

@@ -4609,6 +4609,7 @@ extern int tree_map_base_marked_p (const void *);
 extern void DEBUG_FUNCTION verify_type (const_tree t);
 extern bool gimple_canonical_types_compatible_p (const_tree, const_tree,
 						 bool trust_type_canonical = true);
+extern bool type_with_interoperable_signedness (const_tree);
 /* Return simplified tree code of type that is used for canonical type merging.  */
 inline enum tree_code
 tree_code_for_canonical_type_merging (enum tree_code code)