re PR libfortran/32611 (Print sign of negative zero)

2007-07-15  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
	    Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>

	PR fortran/32611
	* gfortran.h (gfc_option_t): Add flag_sign_zero field.
	* lang.opt (-fsign-zero): New option.
	* trans.h: Rename gfor_fndecl_set_std into gfor_fndecl_set_options.
	* trans-decl.c (gfc_build_builtin_function_decls): Build the function
	declaration to pass an array containing the options to be used by the
	runtime library. (gfc_generate_function_code): Build an array that
	contains option values to be passed to the runtime library and the call
	to the function. 
	* options.c (gfc_init_options): Initialize the flag_sign_zero field.
	(gfc_handle_option): Handle the -fsign-zero option.

Co-Authored-By: Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>

From-SVN: r126655

gcc/fortran/ChangeLog

+2007-07-15  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+	    Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
+	PR fortran/32611
+	* gfortran.h (gfc_option_t): Add flag_sign_zero field.
+	* lang.opt (-fsign-zero): New option.
+	* trans.h: Rename gfor_fndecl_set_std into gfor_fndecl_set_options.
+	* trans-decl.c (gfc_build_builtin_function_decls): Build the function
+	declaration to pass an array containing the options to be used by the
+	runtime library. (gfc_generate_function_code): Build an array that
+	contains option values to be passed to the runtime library and the call
+	to the function. 
+	* options.c (gfc_init_options): Initialize the flag_sign_zero field.
+	(gfc_handle_option): Handle the -fsign-zero option.
+
 2007-07-15  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
 	PR fortran/32036

gcc/fortran/gfortran.h

@@ -1861,6 +1861,7 @@ typedef struct
   int flag_cray_pointer;
   int flag_d_lines;
   int flag_openmp;
+  int flag_sign_zero;
 
   int fpe;
 

gcc/fortran/lang.opt

@@ -249,6 +249,10 @@ fshort-enums
 Fortran
 Use the narrowest integer type possible for enumeration types
 
+fsign-zero
+Fortran
+Apply negative sign to zero values
+
 funderscoring
 Fortran
 Append underscores to externally visible names

gcc/fortran/options.c

@@ -102,6 +102,7 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
   gfc_option.flag_cray_pointer = 0;
   gfc_option.flag_d_lines = -1;
   gfc_option.flag_openmp = 0;
+  gfc_option.flag_sign_zero = 1;
 
   gfc_option.fpe = 0;
 
@@ -619,6 +620,10 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_handle_module_path_options (arg);
       break;
     
+    case OPT_fsign_zero:
+      gfc_option.flag_sign_zero = value;
+      break;
+    
     case OPT_ffpe_trap_:
       gfc_handle_fpe_trap_option (arg);
       break;

gcc/fortran/trans-decl.c

@@ -88,7 +88,7 @@ tree gfor_fndecl_runtime_error_at;
 tree gfor_fndecl_os_error;
 tree gfor_fndecl_generate_error;
 tree gfor_fndecl_set_fpe;
-tree gfor_fndecl_set_std;
+tree gfor_fndecl_set_options;
 tree gfor_fndecl_set_convert;
 tree gfor_fndecl_set_record_marker;
 tree gfor_fndecl_set_max_subrecord_length;
@@ -2364,15 +2364,11 @@ gfc_build_builtin_function_decls (void)
     gfc_build_library_function_decl (get_identifier (PREFIX("set_fpe")),
 				    void_type_node, 1, gfc_c_int_type_node);
 
-  gfor_fndecl_set_std =
-    gfc_build_library_function_decl (get_identifier (PREFIX("set_std")),
-				    void_type_node,
-				    5,
-				    gfc_int4_type_node,
-				    gfc_int4_type_node,
-				    gfc_int4_type_node,
-				    gfc_int4_type_node,
-				    gfc_int4_type_node);
+  /* Keep the array dimension in sync with the call, later in this file.  */
+  gfor_fndecl_set_options =
+    gfc_build_library_function_decl (get_identifier (PREFIX("set_options")),
+				    void_type_node, 2, gfc_c_int_type_node,
+				    pvoid_type_node);
 
   gfor_fndecl_set_convert =
     gfc_build_library_function_decl (get_identifier (PREFIX("set_convert")),
@@ -3152,23 +3148,56 @@ gfc_generate_function_code (gfc_namespace * ns)
   /* Now generate the code for the body of this function.  */
   gfc_init_block (&body);
 
-  /* If this is the main program, add a call to set_std to set up the
+  /* If this is the main program, add a call to set_options to set up the
      runtime library Fortran language standard parameters.  */
-
   if (sym->attr.is_main_program)
     {
-      tree gfc_int4_type_node = gfc_get_int_type (4);
-      tmp = build_call_expr (gfor_fndecl_set_std, 5,
-			     build_int_cst (gfc_int4_type_node,
-					    gfc_option.warn_std),
-			     build_int_cst (gfc_int4_type_node,
-					    gfc_option.allow_std),
-			     build_int_cst (gfc_int4_type_node,
-					    pedantic),
-			     build_int_cst (gfc_int4_type_node,
-					    gfc_option.flag_dump_core),
-			     build_int_cst (gfc_int4_type_node,
-					    gfc_option.flag_backtrace));
+      tree gfc_c_int_type_node = gfc_get_int_type (gfc_c_int_kind);
+      tree array_type, array, var;
+
+      /* Passing a new option to the library requires four modifications:
+	   + add it to the tree_cons list below
+	   + change the array size in the call to build_array_type
+	   + change the first argument to the library call
+	     gfor_fndecl_set_options
+	   + modify the library (runtime/compile_options.c)!  */
+      array = tree_cons (NULL_TREE,
+			 build_int_cst (gfc_c_int_type_node,
+					gfc_option.warn_std), NULL_TREE);
+      array = tree_cons (NULL_TREE,
+			 build_int_cst (gfc_c_int_type_node,
+					gfc_option.allow_std), array);
+      array = tree_cons (NULL_TREE,
+			 build_int_cst (gfc_c_int_type_node, pedantic), array);
+      array = tree_cons (NULL_TREE,
+			 build_int_cst (gfc_c_int_type_node,
+					gfc_option.flag_dump_core), array);
+      array = tree_cons (NULL_TREE,
+			 build_int_cst (gfc_c_int_type_node,
+					gfc_option.flag_backtrace), array);
+      array = tree_cons (NULL_TREE,
+			 build_int_cst (gfc_c_int_type_node,
+					gfc_option.flag_sign_zero), array);
+
+      array_type = build_array_type (gfc_c_int_type_node,
+				     build_index_type (build_int_cst (NULL_TREE,
+								      5)));
+      array = build_constructor_from_list (array_type, nreverse (array));
+      TREE_CONSTANT (array) = 1;
+      TREE_INVARIANT (array) = 1;
+      TREE_STATIC (array) = 1;
+
+      /* Create a static variable to hold the jump table.  */
+      var = gfc_create_var (array_type, "options");
+      TREE_CONSTANT (var) = 1;
+      TREE_INVARIANT (var) = 1;
+      TREE_STATIC (var) = 1;
+      TREE_READONLY (var) = 1;
+      DECL_INITIAL (var) = array;
+      var = gfc_build_addr_expr (pvoid_type_node, var);
+
+      tmp = build_call_expr (gfor_fndecl_set_options, 2,
+			     build_int_cst (gfc_c_int_type_node, 6), var);
       gfc_add_expr_to_block (&body, tmp);
     }
 

gcc/fortran/trans.h

@@ -495,7 +495,7 @@ extern GTY(()) tree gfor_fndecl_runtime_error_at;
 extern GTY(()) tree gfor_fndecl_os_error;
 extern GTY(()) tree gfor_fndecl_generate_error;
 extern GTY(()) tree gfor_fndecl_set_fpe;
-extern GTY(()) tree gfor_fndecl_set_std;
+extern GTY(()) tree gfor_fndecl_set_options;
 extern GTY(()) tree gfor_fndecl_ttynam;
 extern GTY(()) tree gfor_fndecl_ctime;
 extern GTY(()) tree gfor_fndecl_fdate;