[Ada] Gigi support for OpenACC pragmas

Matching front-end bits to support Acc_Kernels, Acc_Parallel,
Acc_Loop and Acc_Data.

2018-12-03  Olivier Hainque  <hainque@adacore.com>

gcc/ada/

	* gcc-interface/lang.opt (fopenacc): New option for Ada.
	* gcc-interface/misc.c (gnat_handle_option): Handle it.
	* gcc-interface/trans.c (struct loop_info_d): Add OMP
	attributes.
	(Iterate_Acc_Clause_Arg, Acc_gnat_to_gnu): New functions,
	helpers for OpenACC pragmas processing in Pragma_to_gnu.
	(Acc_Var_to_gnu, Acc_Reduc_Var_to_gnu, Acc_Reduc_to_gnu):
	Likewise.
	(Acc_Size_Expr_to_gnu, Acc_Size_List_to_gnu): Likewise.
	(Pragma_Acc_Data_to_gnu): Likewise.
	(Pragma_to_gnu): Handle Pragma_Acc_Loop, Pragma_Acc_Data,
	Pragma_Acc_Kernels and Pragma_Acc_Parallel.
	(Acc_Loop_to_gnu, Regular_Loop_to_gnu): New functions. Helpers
	for ...
	(Loop_Statement_to_gnu): Rework to handle OpenACC loops.

From-SVN: r266748

gcc/ada/ChangeLog

 2018-12-03  Olivier Hainque  <hainque@adacore.com>
 
+	* gcc-interface/lang.opt (fopenacc): New option for Ada.
+	* gcc-interface/misc.c (gnat_handle_option): Handle it.
+	* gcc-interface/trans.c (struct loop_info_d): Add OMP
+	attributes.
+	(Iterate_Acc_Clause_Arg, Acc_gnat_to_gnu): New functions,
+	helpers for OpenACC pragmas processing in Pragma_to_gnu.
+	(Acc_Var_to_gnu, Acc_Reduc_Var_to_gnu, Acc_Reduc_to_gnu):
+	Likewise.
+	(Acc_Size_Expr_to_gnu, Acc_Size_List_to_gnu): Likewise.
+	(Pragma_Acc_Data_to_gnu): Likewise.
+	(Pragma_to_gnu): Handle Pragma_Acc_Loop, Pragma_Acc_Data,
+	Pragma_Acc_Kernels and Pragma_Acc_Parallel.
+	(Acc_Loop_to_gnu, Regular_Loop_to_gnu): New functions. Helpers
+	for ...
+	(Loop_Statement_to_gnu): Rework to handle OpenACC loops.
+
+2018-12-03  Olivier Hainque  <hainque@adacore.com>
+
 	* gcc-interface/targtyps.c (MALLOC_OBSERVABLE_ALIGNMENT): Set to
 	2 * POINTER_SIZE.
 

gcc/ada/gcc-interface/lang.opt

@@ -100,4 +100,8 @@ fbuiltin-printf
 Ada Undocumented
 Ignored.
 
+fopenacc
+Ada LTO
+; Documented in C but it should be: Enable OpenACC support
+
 ; This comment is to ensure we retain the blank line above.

gcc/ada/gcc-interface/misc.c

@@ -166,6 +166,7 @@ gnat_handle_option (size_t scode, const char *arg, HOST_WIDE_INT value,
       /* These are handled by the front-end.  */
       break;
 
+    case OPT_fopenacc:
     case OPT_fshort_enums:
     case OPT_fsigned_char:
     case OPT_funsigned_char: